What an Owens Corning Preferred Contractor Means for You in St. Louis

Updated August 26, 2026 | Lane House Roofing & Exteriors, St. Louis, MO

Direct Answer

An Owens Corning Preferred Contractor in St. Louis is a roofing company vetted by Owens Corning for insurance, licensing, and installation training. The certification allows the contractor to register enhanced Owens Corning warranty tiers, including workmanship coverage, that uncertified installers cannot offer, and it can be verified on Owens Corning’s public contractor directory.

TL;DR

• The Owens Corning Preferred badge is earned through manufacturer vetting for insurance, licensing, and training, and it must be maintained to keep.
• Any roofer can buy Owens Corning shingles; only certified contractors can register the enhanced warranty tiers.
• Workmanship coverage, the protection most homeowners assume they have, comes only with the Preferred Protection tier or above.
• Platinum Preferred is a higher tier with a higher warranty ceiling; Preferred is the verified standard, and local track record matters as much as the tier.
• Louis hail, wind, and freeze-thaw cycles punish marginal installations, which makes workmanship coverage worth more here.
• You can verify any contractor’s certification in about 30 seconds on Owens Corning’s directory. Check before you sign.

One liner: Your contractor sets your warranty ceiling.

Key Numbers

Figure	Value	Source
Duration shingle wind warranty	130 mph with four-nail installation	Owens Corning datasheet [8]
Workmanship coverage, Preferred Protection	10 years	Owens Corning warranty comparison [4]
Minimum OC components for enhanced tiers	4, including underlayment and hip and ridge	Owens Corning warranty documents [5]
Warranty registration window	60 days from installation	Owens Corning warranty documents [5]
Costliest U.S. hailstorm, April 10, 2001	Above 2 billion dollars, mostly St. Louis area	Missouri Climate Center [10]
Hail size that damages composite shingles	1.25 inches and larger	Missouri Climate Center [10]
Lane House serving St. Louis	20+ years, A+ BBB rating	Lane House and BBB [7]

What Is an Owens Corning Preferred Contractor?

In short: An Owens Corning Preferred Contractor is a roofing company the manufacturer has vetted and admitted into its contractor network. The badge has to be earned through insurance, licensing, and training requirements, and it has to be kept.

An Owens Corning Preferred Contractor is a roofing company that has met Owens Corning’s standards for professionalism, reliability, and installation quality, and has been admitted into the manufacturer’s contractor network [1]. To earn and keep the designation, a contractor must carry general liability and workers’ compensation insurance, hold the licensing their state and local market require, and complete Owens Corning’s installation training so crews install shingles the way the engineers designed them to go on [1][2].

Here’s the distinction that trips people up. Any roofer in St. Louis can walk into a supply house and buy Owens Corning shingles this afternoon. Buying the product takes a credit card. Carrying the badge takes vetting. The certification isn’t about what’s on the truck; it’s about whether the manufacturer has looked at the company behind the truck and agreed to put its name next to theirs.

After a storm, when three roofing trucks park on one street with three different logos, the Owens Corning designation cuts through the noise because it’s independently verifiable. Lane House Roofing & Exteriors, for example, holds a listed profile on Owens Corning’s official contractor directory at its Lemay Ferry Road address in St. Louis [1]. You don’t have to take the yard sign’s word for it. You can look it up in about 30 seconds, and later in this guide we’ll show you exactly how.

One more thing worth knowing up front: the designation isn’t permanent, and it isn’t a one-time handshake. Contractors must maintain their insurance, their standing, and their installation standards to stay in the network, they remain subject to Owens Corning’s ongoing program standards, and installations can face manufacturer quality reviews [2]. That continuing accountability is a big part of what you’re actually hiring.

Certified vs Regular Roofer: What Actually Changes

In short: Certification changes three things: who vetted the company before you hired them, how the crew was trained, and what warranty protection you’re eligible to register. It’s the difference between a contractor’s promise and a manufacturer’s paper trail.

Think of it like car service. Any mechanic can order factory parts. A factory-authorized shop has been trained on them, audited on them, and answers to the brand if the work goes sideways. Roofing works the same way, and the stakes are higher because the part covers your whole house.

Here’s the practical breakdown for a St. Louis homeowner comparing quotes:

What you’re weighing	Regular roofer	Owens Corning Preferred Contractor
Vetting	Self-reported	Screened by the manufacturer for insurance, licensing, and standing [1]
Installation training	Varies crew to crew	Documented Owens Corning installation training [2]
Warranty access	Standard material warranty only	Eligible to register enhanced Owens Corning warranty tiers [4]
Insurance	You have to ask and verify	Required to hold and maintain coverage to keep the badge [2]
If the company folds	Your recourse folds with it	The manufacturer relationship and registered warranty remain on record

The warranty row deserves a closer look, because it’s where most homeowners get burned without knowing it. A standard shingle warranty covers manufacturing defects in the product itself. It does not cover installation mistakes, and improper installation is one of the most common reasons warranty claims get denied [3]. Read that again: the coverage you think protects your roof can be voided by the person nailing it down. When a certified contractor installs the system, you can register warranty tiers that add workmanship coverage on top of the material coverage, which closes exactly that gap. We’ll walk the full warranty ladder in the next section.

Now the scenario nobody plans for. Two years after a roof replacement, a flashing detail starts leaking into a bedroom ceiling. If the installer was an out-of-state crew that canvassed your street after a hailstorm, there’s a decent chance the phone number on the invoice is dead. You’re paying twice. If the installer was a certified local contractor, the company is still there, the warranty is registered with Owens Corning, and there’s a documented standard the work was supposed to meet. Accountability doesn’t fix a leak by itself, but it decides who pays for the fix.

The Owens Corning Warranty Tiers, and What Certification Unlocks

In short: Owens Corning offers four warranty levels. The bottom one comes free with the shingles. The three above it require a certified contractor to install and register the roof, and only the enhanced tiers add workmanship coverage.

A quick plain-English gloss before the ladder: workmanship coverage means the warranty pays when the problem is an installation error, not a defective shingle. It’s the coverage most homeowners assume they have and usually don’t.

Every Owens Corning warranty starts with a TRU PROtection period, the early years when coverage includes labor to repair or replace defective materials, not materials alone [4]. What changes between tiers is how long that period lasts, whether tear-off and disposal are covered, and whether workmanship is covered at all. Here’s the ladder [4][5]:

Warranty	What it adds	Workmanship coverage	Who can register it
Standard Product	Manufacturing-defect coverage at no added cost; shorter non-prorated period covering material and labor	None	Any installation
System Protection	Extended non-prorated period; adds tear-off and disposal costs; requires qualifying OC components installed as a system	None	Certified OC contractor
Preferred Protection	Everything above, plus a 10-year workmanship warranty	10 years	Certified OC Preferred or Platinum contractor
Platinum Protection	The strongest tier, with extended workmanship coverage	Extended, top tier	Platinum Preferred contractor only

Two mechanics in that table decide everything, so let’s make them explicit.

First, your contractor’s certification sets your warranty ceiling. An uncertified roofer can hand you Owens Corning shingles with the Standard warranty, and that’s the end of the menu. The enhanced tiers, the ones with longer full-coverage periods and workmanship protection, are only available when a certified contractor installs the roof as a qualifying system and registers it [4][5]. Choosing the contractor is choosing the coverage.

Second, the enhanced tiers treat your roof as a system, not a stack of shingles. Preferred Protection requires a minimum of four Owens Corning components on the roof, including underlayment and hip and ridge shingles [5]. That’s not a sales gimmick. Components engineered together seal, vent, and shed water together, and Owens Corning backs the combination precisely because it controls how every part behaves.

A few honest boundaries, because a warranty is only as good as your understanding of it. Registration matters: the contractor must register the enhanced warranty within 60 days of installation, so get written confirmation it happened [5]. Transfers are one-time if you sell the home [4]. And no manufacturer warranty covers storm damage, neglected maintenance, or ventilation problems; that’s what insurance and inspections are for [3]. A certified contractor who explains those boundaries up front is telling you the truth. One who waves the word lifetime around without paperwork is not.

Preferred vs Platinum Preferred: An Honest Look at the Tiers

In short: Both tiers are manufacturer vetted and both unlock enhanced Owens Corning warranties. Platinum is a higher bar with a higher warranty ceiling. Preferred is the verified standard tier, and for most St. Louis homeowners the contractor behind the badge matters more than the metal of the badge.

You’ll see both badges on trucks around St. Louis, so let’s define them without the sales gloss. Owens Corning’s contractor network has tiers, and Platinum Preferred sits at the top. Platinum status is frequently described as covering roughly the top 1 percent of roofing contractors nationally, and reaching it involves requirements around installation volume, tenure with Owens Corning, and sustained customer satisfaction standards [6]. Preferred is the standard verified tier: fully vetted for insurance, licensing, and training, and authorized to install and register enhanced warranty tiers [1][4].

Here’s what that means side by side:

	Preferred	Platinum Preferred
Vetted by Owens Corning (insurance, licensing, training)	Yes	Yes
Can register System and Preferred Protection warranties	Yes	Yes
Workmanship coverage available to you	10 years under Preferred Protection [5]	Extended coverage under Platinum Protection [4]
Typical profile	Includes established local firms	Skews toward high-volume, long-tenured operations

Notice what the table doesn’t say. It doesn’t say Platinum crews install better roofs, and it doesn’t say Preferred is probationary. Both tiers passed the same fundamental vetting. The real difference you can act on is the warranty ceiling: Platinum contractors can register the Platinum Protection warranty with its extended workmanship coverage, while Preferred contractors top out at Preferred Protection with 10 years of workmanship coverage [4][5].

One housekeeping note: Owens Corning’s network has used several tier names over the years, including Certified, Select, Preferred, and Platinum Preferred. Don’t decode badge vintage from a truck door; the current directory listing is the only version that counts [6].

So how should a homeowner weigh the tiers? Ten years of manufacturer-backed workmanship coverage is substantial. Installation errors that surface tend to surface early, in the first seasons of freeze-thaw and storm cycling, well inside that window. Past the warranty math, the tier tells you nothing about the questions that decide whether your project goes well: Who is actually on my roof, employees or a rotating sub crew? How long has the company operated in this market? Will the owner answer the phone in year six? A Preferred contractor with two decades in South County and an A+ BBB rating offers a different kind of assurance than a badge alone, whatever the badge [7].

Our honest advice: treat the tier as a filter, not a verdict. Confirm the contractor is certified at either level, confirm in writing which warranty they’ll register for your roof, then judge the company the way you’d judge any business you’re trusting with your biggest asset: local track record, references, and how straight they talk about coverage limits.

Owens Corning Shingles and the Total Protection Roofing System

In short: Owens Corning designs its shingles, underlayment, ventilation, and ridge products to work as one system. That’s why the enhanced warranties require multiple components, and why the flagship Duration shingle carries a 130 mph wind warranty.

The shingle you’ll most often see on a certified contractor’s quote in St. Louis is the TruDefinition Duration series, Owens Corning’s flagship architectural shingle. Its signature feature is SureNail Technology: a woven, engineered fabric strip embedded in the nailing zone that gives every nail something structural to bite into beyond asphalt and granules [8]. That anchor is why Duration shingles are engineered to deliver a 130 mph wind warranty with standard four-nail installation [8]. For homes in the hail belt, the Duration STORM variant adds Class 4 impact resistance, the highest rating under the UL 2218 test, which can qualify for insurance premium discounts with some Missouri carriers [9]. Duration also comes in more than 20 colors, which matters more than it sounds in St. Louis, where the right gray or driftwood tone against our brick housing stock does real work for curb appeal.

The shingle is only the visible layer, though. Owens Corning packages its components as the Total Protection Roofing System, built around three jobs [8]:

Job	What it does	Example components
Seal	Creates a water barrier under and around the shingles	Synthetic underlayment, ice and water barrier, starter shingles
Defend	Shields the deck from wind, rain, and impact	Duration shingles, hip and ridge shingles
Breathe	Vents heat and moisture out of the attic	Ridge vents, intake ventilation

Here’s where the system stops being marketing and starts being money. Remember from the warranty ladder that Preferred Protection coverage requires a minimum of four Owens Corning components installed together, including underlayment and hip and ridge [5]. The system requirement and the warranty requirement are the same requirement. When your certified contractor specs the full stack, they’re not padding the invoice; they’re assembling the exact configuration Owens Corning agrees to stand behind, including the ventilation that keeps shingles from cooking from underneath. Poor attic ventilation is one of the classic warranty-voiding conditions, so the breathe layer protects the paper as much as the plywood [3].

One practical note for your quote review: ask which components are Owens Corning and which are generic. A quote can say Duration shingles in bold and still swap third-party underlayment underneath, and mixing components is a common way homeowners lose enhanced-tier eligibility without knowing it [4].

Why This Matters in St. Louis Weather Specifically

In short: St. Louis roofs face hail, straight-line winds, 100-degree summers, and freeze-thaw winters, a combination that finds every shortcut in an installation. Workmanship coverage and system installation are worth more here than in almost any mild-weather market.

Certification arguments can sound abstract until you put them on a St. Louis street. So consider the record. The costliest hailstorm in U.S. history tracked along the I-70 corridor on April 10, 2001, with damage estimates above 2 billion dollars, most of it in the St. Louis area [10]. That storm was an outlier in cost, not in kind. NWS St. Louis has logged a steady run of severe events in recent years, including the May 2025 St. Louis tornado, the Easter 2025 tornado and damaging-wind outbreak, and repeated large-hail and straight-line-wind events across the metro in 2024 [11]. Hail doesn’t need to make the news to matter, either: stones larger than about 1.25 inches can damage heavy composite shingles [10], and the metro logs hail reports in most years.

Now connect the weather to the workmanship. Our climate attacks a roof from four directions across a single year. Summer attic temperatures cook sealant lines and exaggerate any ventilation shortfall. Fall and spring supercells drive rain sideways and test every flashing joint and nail placement. Winter freeze-thaw cycles pry at any gap water can reach, then widen it. A roof installed to specification shrugs most of this off. A roof with misplaced nails, skipped starter courses, or an unbalanced vent system fails at exactly these pressure points, usually in year two or three rather than day one, after the installer’s own goodwill has expired. That’s precisely the window a 10-year workmanship warranty exists to cover [5].

The product side helps too. SureNail’s fastener anchoring is engineered for 130 mph wind performance [8], which is meaningful in a metro that saw straight-line winds top 90 mph as recently as July 2021 [11]. And for hail-prone South County neighborhoods, Class 4 impact-rated shingles like Duration STORM give an insurance conversation a better starting point [9].

Speaking of insurance: after a storm, the claim often matters as much as the repair. A certified local contractor can document damage to the standard adjusters expect, and, unlike the out-of-town crews that follow hail maps into town, will still be here when the supplement questions come months later. Lane House works with homeowners on storm-damage documentation for exactly this reason, and it’s the kind of help you can’t get from a truck that’s already three states away [7].

Does a Certified Roofer Cost More?

In short: The certification itself isn’t a surcharge. Quotes differ because of what’s on them: components, warranty tier, tear-off scope, and crew quality. Compare what’s included, and the certified quote is often the better deal even when the number is higher.

Let’s answer the question the way you’d want a friend in the business to answer it. Owens Corning certification doesn’t come with a mandatory price markup, and a Preferred Contractor isn’t obligated to charge more than the shop down the road [6]. When a certified quote comes in higher than an uncertified one, the gap is almost always in the scope: a full component system rather than shingles over whatever’s cheapest, an enhanced warranty registered in your name, complete tear-off rather than an overlay, and an employed crew rather than the lowest subcontract bid of the week.

So the smart move isn’t hunting the lowest total. It’s making the quotes comparable. Before you weigh numbers, line up these five items side by side:

1. Components: Which underlayment, starter, hip and ridge, and ventilation products are specified, and are they part of a qualifying system?
2. Warranty: Which warranty tier will actually be registered for your roof, in writing, and who confirms registration within the 60-day window [5]?
3. Tear-off scope: Full tear-off with disposal, or a layover that can hide deck problems and complicate future coverage?
4. The crew: Employees or day-rate subs? Who supervises, and who handles the punch list?
5. Payment terms: When is money due, and what happens if you’re not satisfied?

Run that comparison and the cheap quote usually stops being cheap. And here’s the math that matters most: the expensive roof is the one you pay for twice. An uncovered workmanship failure means paying for diagnosis, repair, and sometimes interior damage entirely out of pocket, while the same failure under a registered Preferred Protection warranty is Owens Corning’s problem to arrange and cover, including labor, tear-off, and disposal during the coverage period [5]. One avoided repair can swallow the entire difference between two quotes.

Cost risk isn’t only about the total, either; it’s about when the money leaves your hands. This is worth screening for in any contractor. Lane House, for instance, provides free detailed estimates, offers 100 percent financing, and doesn’t bill until the work is complete, aside from partial payment on special-order material [7]. A contractor confident enough to be paid at the end is telling you something about how the middle will go.

How to Verify Any Contractor’s Certification in 30 Seconds

In short: Don’t take the yard sign’s word for it. Owens Corning publishes a searchable directory of its certified contractors. If a company claims the badge, their profile is public, and checking takes half a minute.

Every claim in this article comes down to one habit: verify, don’t assume. Here’s the full check:

6. Go to the Owens Corning contractor locator at owenscorning.com/en-us/roofing/contractors [1].
7. Enter your ZIP code (63125, 63129, and the rest of South County all work).
8. Find the company name in the results.
9. Open the profile and confirm the business name, address, and phone number match the company that quoted you. A legitimate listing shows the contractor’s real location, not a P.O. box two states away.

That’s it. No account, no phone call, no awkward conversation. And we’ll go first: Lane House Roofing & Exteriors is listed on the Owens Corning directory at 3814 Lemay Ferry Rd, St. Louis, MO 63125 [1]. Open it right now and compare it against this page. Any contractor asking for your trust should be comfortable with that exact test, and if a company gets cagey when you mention checking, you’ve learned what you needed to know for free.

While you’re verifying, watch for the wording tricks that imply certification without claiming it outright:

• “We install Owens Corning products.” True of anyone with a supplier account. Installing the brand isn’t holding the certification.
• A logo with no profile. Manufacturer logos on a website or truck are decoration until the directory confirms them.
• “Factory trained” with no factory named. Ask which program, then check that program’s directory.
• A tier claim that doesn’t match the listing. If the pitch says Platinum and the directory says otherwise, the pitch is doing extra work.

Round out the check with two more documents before you sign anything: a current certificate of insurance naming general liability and workers’ compensation, and the warranty tier that will be registered for your roof, in writing. Pair the OC listing with a Better Business Bureau lookup and you’ve built a two-source verification habit that filters out nearly every bad actor canvassing after a storm [7]. Thirty seconds of checking beats three years of regretting.

Choosing Your Owens Corning Preferred Contractor in St. Louis

In short: You now know what the badge means, what it unlocks, and how to verify it. The last step is picking a certified contractor with the local track record to back the paperwork, and getting a free estimate on the calendar.

Everything in this guide reduces to one sentence: your contractor sets your warranty ceiling, so choose the contractor the way you’d choose the coverage. The shingles matter, the system matters, but the company that nails it all down determines whether you end up with a registered, manufacturer-backed roof or an expensive stack of good materials.

If you’re comparing certified roofers in the St. Louis area, here’s what Lane House Roofing & Exteriors puts on the table, all of it independently checkable:

• Owens Corning Preferred Contractor, listed on the official OC directory at 3814 Lemay Ferry Rd, St. Louis, MO 63125 [1]
• A+ rating with the Better Business Bureau as an accredited business, alongside our public Google reviews [7]
• More than 20 years serving St. Louis and South County, built on founder Kerry House’s four decades in the roofing trade [7]
• Free, detailed estimates with transparent quotes and no hidden fees [7]
• No payment until the job is complete, aside from partial payment on special-order materials, with 100 percent financing available [7]
• Storm damage claims support, with documentation prepared to the standard insurance adjusters expect [7]

We handle complete roof replacement in St. Louis and the surrounding metro, including Mehlville, Oakville, Affton, Fenton, and Webster Groves, along with full exterior work when the project calls for it. Roof replacements typically wrap in one to three days, and the crew leaves the property as clean as it was found [7]. You can browse more guides like this one in our articles library.

Ready to see what a certified installation looks like on your own roof? Request a free estimate or call (314) 845-2166. And in the spirit of this whole article: before you call anyone, including us, take your 30 seconds and look the company up. We’ll be there.

Frequently Asked Questions

What is an Owens Corning Preferred Contractor?

A roofing company vetted by Owens Corning for insurance, licensing, and installation training, and authorized to register enhanced Owens Corning warranties. Every certified contractor has a public profile on the Owens Corning directory.

What is the difference between Preferred and Platinum Preferred?

Both tiers are manufacturer vetted. Platinum is a higher bar tied to volume, tenure, and satisfaction standards, and it unlocks the Platinum Protection warranty. Preferred unlocks up to Preferred Protection, which includes 10 years of workmanship coverage.

Does hiring a certified roofer cost more?

Certification carries no mandatory markup. Price differences come from scope: components, warranty tier, tear-off, and crew. Compare what each quote includes rather than the bottom line alone.

How do I verify a roofer’s Owens Corning certification?

Search the contractor locator on the Owens Corning website, enter your ZIP code, and confirm the profile matches the company’s name, address, and phone number.

Is the Owens Corning warranty transferable if I sell my home?

Yes. Enhanced Owens Corning warranties allow a one-time transfer to the new owner. Timing rules and a fee apply, so confirm the current terms when you sell.

What voids an Owens Corning roof warranty?

Common causes include improper installation, inadequate attic ventilation, unapproved modifications, and warranties that were never registered. Storm damage falls under homeowners insurance rather than the manufacturer warranty.

What is the TRU PROtection period?

The early, non-prorated years of an Owens Corning warranty when coverage includes labor to repair or replace defective materials, not materials alone. Enhanced tiers extend this period substantially.

Is Owens Corning better than GAF?

Both are top tier manufacturers with certified contractor programs and enhanced warranties. The bigger variable is the installer: a certified contractor in either system beats an uncertified one in both.

Do all components need to be Owens Corning for the enhanced warranty?

Enhanced tiers require a minimum of four qualifying Owens Corning components, including underlayment and hip and ridge shingles. Ask your contractor which specified products qualify.

How do I know my warranty was actually registered?

Ask for written confirmation of registration within 60 days of installation, including the tier name and the registration record.

Definition Bank

Term	Plain-English definition
Preferred Contractor	A roofer vetted and admitted into Owens Corning’s contractor network, authorized to register enhanced warranties.
Platinum Preferred Contractor	The top tier of the Owens Corning network, able to register the Platinum Protection warranty.
Workmanship coverage	Warranty protection for installation errors, not product defects.
TRU PROtection period	The early warranty years when coverage includes labor, not materials alone.
Total Protection Roofing System	Owens Corning’s engineered stack of shingles, underlayment, ventilation, and ridge products designed to work together.
SureNail Technology	A woven fabric strip in the shingle’s nailing zone that anchors fasteners for higher wind resistance.
Class 4 impact rating	The highest hail-impact rating under the UL 2218 test.
Warranty registration	The contractor’s filing that activates an enhanced warranty, required within 60 days of installation.
Tear-off	Removing the old roof down to the deck rather than layering over it.
System components	The qualifying Owens Corning products (underlayment, starter, hip and ridge, vents) required for enhanced warranty eligibility.

Entity Cards

Owens Corning TruDefinition Duration Shingles

Property	Value
Type	Architectural (dimensional) asphalt shingle
Wind warranty	130 mph
Key technology	SureNail reinforced nailing strip
Severe-weather option	Duration STORM, Class 4 impact rated
Colors	More than 20

Lane House Roofing & Exteriors

Property	Value
Certification	Owens Corning Preferred Contractor
BBB rating	A+ accredited
Service area	St. Louis metro, South County, Metro East
Serving since	2003, founder in the trade 40+ years
Phone	(314) 845-2166

Sources

10. Owens Corning, Roofing Contractor Directory, Lane House Roofing & Exteriors profile, owenscorning.com, accessed August 2026.
11. Owens Corning, Roofing Contractor Network program pages, owenscorning.com, accessed August 2026.
12. American Home Contractors, Owens Corning Roof Warranty Explained: Coverage and Tiers, 2026.
13. Owens Corning, Preferred Protection Roofing System Limited Warranty comparison brochure, published warranty literature, accessed August 2026.
14. Owens Corning, Preferred Protection Limited Warranty document, published warranty literature, accessed August 2026.
15. Cornerstone Roofing and Siding, Owens Corning Preferred vs Platinum Preferred, 2026.
16. Lane House Roofing & Exteriors, lanehouseroofingandexteriors.com, and Better Business Bureau profile, accessed August 2026.
17. Owens Corning, TruDefinition Duration Shingles with SureNail Technology product datasheet, accessed August 2026.
18. Owens Corning, TruDefinition Duration STORM Shingles product literature, accessed August 2026.
19. Missouri Climate Center, University of Missouri, hail climatology summary, climate.missouri.edu.
20. National Weather Service St. Louis, Significant Weather Event Reviews archive, weather.gov/lsx/events.