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NOAA/NWS STORM PREDICTION CENTER REPORTS + U.S. CENSUS DATA

Hail, Wind & Tornado Reports in and near ZIP 37921

Public hail, wind, and tornado reports in and near ZIP 37921 from May 30, 1974 through December 19, 2025, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Example: 37921 — search hail, wind and tornado public reports for any U.S. ZIP code 
Hail Reports
55
Wind Reports
206
Tornado Reports
1
Max Hail Size
3.00″
Source  NOAA SPC · NWS Local Storm Reports Coverage  ZIP 37921 · 1974–present Updated  Daily · last Dec 19, 2025

Latest NWS Hail Reports in and near ZIP 37921

55 reports
Free hail report for your home →
1.00″ hail
Jun 26, 2018
9:20 PM UTC
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: REPORTED AT DIFFERENT LOCATIONS ACROSS KNOXVILLE.
NWS Hail Report Location: Knoxville, TN
1.00″ hail
Jun 26, 2018
8:20 PM UTC
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: REPORTED AT DIFFERENT LOCATIONS ACROSS KNOXVILLE.
NWS Hail Report Location: Knoxville, TN
1.75″ hail
Apr 22, 2017
9:25 PM UTC
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: SEVERAL REPORTS OF GOLFBALL SIZE HAIL IN AND AROUND KNOXVILLE. REPORTS FROM FB AND TWITTER WITH PICTURES.
NWS Hail Report Location: Knoxville, TN
1.00″ hail
Apr 25, 2015
11:00 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported hail as large as a quarter in north Knoxville near the intersection on I640 and Broadway.
NWS Hail Report Location: N Knoxville, TN
1.00″ hail
Apr 25, 2015
11:00 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported hail as large as a quarter in northwest Knoxville near the intersection on I640 and Western Avenue.
NWS Hail Report Location: N Knoxville, TN
1.00″ hail
Jul 27, 2014
8:12 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: Quarter sized hail was reported on Alcoa Highway approximately one half mile from University of Tennessee Medical Center.
NWS Hail Report Location: N West Knoxville, TN
1.75″ hail
Jul 2, 2012
8:15 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: Quarter to golf ball size hail occurred in the western part of Knoxville.
NWS Hail Report Location: .56 W West Knoxville, TN
1.00″ hail
Jul 2, 2012
8:15 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: Marble to quarter size hail was reported in the western part of Knoxville.
NWS Hail Report Location: N West Knoxville, TN
1.00″ hail
Apr 26, 2012
6:20 AM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported thunderstorms produced quarter-size hail in Knoxville.
NWS Hail Report Location: N Knoxville, TN
1.00″ hail
Mar 31, 2012
3:18 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: Quarter size hail was reported in West Knoxville.
NWS Hail Report Location: N West Knoxville, TN
1.25″ hail
Apr 27, 2011
7:32 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported thunderstorms produced half-dollar-size hail at the intersection of central and woodland east of Interstate 275 and north of Interstate 40 in Knoxville.
NWS Hail Report Location: N Knoxville, TN
1.75″ hail
Apr 27, 2011
7:19 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported thunderstorms produced golfball-size hail at the University of Tennessee campus in Knoxville.
NWS Hail Report Location: N Knoxville, TN
1.75″ hail
Apr 27, 2011
7:10 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported thunderstorms produced golfball-size hail in Knoxville.
NWS Hail Report Location: N Knoxville, TN
2.00″ hail
Apr 27, 2011
7:05 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: A trained spotter reported thunderstorms produced 2 inch size hail 2 miles west of Knoxville.
NWS Hail Report Location: 2 W Knoxville, TN
1.00″ hail
Aug 4, 2009
5:20 PM EST-5
Hail report for ZIP 37921
Knox County · 141,465 Homes in County
Hail Report Description: An amateur radio operator reported quarter-size hail fell from a thunderstorm at Denson Avenue in Knoxville.
NWS Hail Report Location: N Knoxville, TN
Showing 15 of 55
Hail Damage Risk for Your Home +

Hail reports describe hail by diameter, often comparing stone size to familiar objects like peas, quarters, golf balls, and softballs. Use this guide as a starting point for possible hail damage to your roof, siding, gutters, vents, windows, and exterior. Actual hail damage depends on hail hardness, density, wind speed, impact angle, roof age, shingle condition, roof pitch, roofing material, installation quality, and prior storm damage.

Pea
0.25″
Low

Usually too small to cause hail damage to most sound asphalt roofs, siding, or gutters.

Mothball
0.50″
Sub-Severe Watch

Below the NWS severe-hail threshold, but not always harmless. Repeated small hail can scuff surfaces, wear aging shingles, and loosen protective granules over time.

Penny
0.75″
Minor / Watch

Below the NWS severe-hail threshold, but roof hail damage is still possible on older, brittle, poorly installed, or previously damaged shingles. May also mark screens, vents, gutters, and soft metal.

Nickel
0.88″
Minor / Watch

Still below the severe-hail threshold, but large enough to leave visible marks on soft metal and add wear to older or hail-weakened roof shingles.

Quarter
1.00″
Watch

The NWS severe-hail threshold. Quarter-size hail can bruise shingles, dent soft metal, and create roof hail damage worth checking.

Half Dollar
1.25″
Watch

More likely to dent gutters, vents, flashing, and siding. Hail damage risk rises quickly on older roofs or hail-weakened shingles.

Ping Pong / Walnut
1.50″
Likely

Hail damage becomes more likely, including bruised shingles, granule loss, dented siding, and damaged roof vents.

Golf Ball
1.75″
Likely

Often causes roof hail damage, cracked shingles, dented gutters, damaged flashing, and siding impacts. A roof inspection is recommended.

Hen Egg
2.00″
Serious

Can crack or puncture shingles, expose mat, dent siding, and cause widespread hail damage across the roof and exterior.

Tennis Ball
2.50″
Serious

Can cause heavy roof hail damage, punctured siding, broken skylights, damaged vents, and widespread exterior damage.

Baseball
2.75″
Major

Major hail damage is likely, including severe roof impacts, damaged siding, broken windows, and possible major roof repairs.

Tea Cup / Large Apple
3.00″
Major

Can cause heavy hail damage across the roof, siding, gutters, windows, and exterior. Significant repairs are often needed.

Softball
4.00″
Extreme

Destructive hail damage. Can severely damage roofing materials, siding, windows, gutters, vents, vehicles, and exterior surfaces.

Grapefruit
4.50″
Extreme

Catastrophic hail damage risk for roofs, windows, vehicles, siding, gutters, and exterior surfaces.

Source: NOAA / National Weather Service hail size references are used for hail-size comparisons and the 1.00″ severe-hail threshold. Damage descriptions are general homeowner guidance, not official NOAA/NWS damage ratings. Sub-severe hail under 1.00″ is below the severe threshold, but that does not mean “no roof damage.” Penny- to nickel-size hail can still contribute to granule loss, cosmetic surface marks, and added wear, especially on older, brittle, poorly installed, or previously damaged roofs.

Latest NWS Wind Reports in and near ZIP 37921

206 reports
Free hail report + wind check →
UNK mph
Dec 19, 2025
4:40 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: Over 75 calls to Knox County dispatch regarding tree and power line damage across Knoxville from the storms. Storm passage between 11 and 11:40 PM.
NWS Wind Report Location: 1 ESE Knoxville, TN
UNK mph
May 21, 2025
2:15 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: Trees down county-wide.
NWS Wind Report Location: 2 W Knoxville, TN
UNK mph
Jul 30, 2024
7:20 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: Several trees down across the county.
NWS Wind Report Location: Knoxville, TN
UNK mph
May 26, 2024
9:19 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: Down powerlines from fallen branches via Knox 911 email alerts.
NWS Wind Report Location: 1 ESE Knoxville, TN
UNK mph
May 16, 2023
9:00 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: 3 TREES DOWN. ONE TREE ON TOP OF CAR.
NWS Wind Report Location: 2 WNW Knoxville, TN
UNK mph
Apr 1, 2023
8:30 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: NUMEROUS TREES WERE BLOWN DOWN AROUND KNOX COUNTY.
NWS Wind Report Location: Knoxville, TN
UNK mph
Mar 3, 2023
8:30 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: WIDESPREAD TREES AND POWER LINES DOWN ACROSS THE COUNTY.
NWS Wind Report Location: Knoxville, TN
UNK mph
Jul 13, 2022
12:40 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: SEVERAL TREES AND POWERLINES DOWN.
NWS Wind Report Location: Knoxville, TN
UNK mph
May 6, 2022
5:25 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: BEVERLEY ROAD/ANDERSON ROAD IN N. KNOXVILLE... TREE DOWN... 3 DIAMETER TOTAL... MULTI TRUNK... BEVERLY ROAD PARTIALLY BLOCKED.
NWS Wind Report Location: Knoxville, TN
UNK mph
Aug 25, 2021
8:28 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: TREE BLOCKING THE ROAD AT CROSBY DRIVE AND LONAS DRIVE.
NWS Wind Report Location: 2 NE Bearden, TN
60 mph
Dec 30, 2019
6:10 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: SPOTTER ESTIMATED 60 MPH THUNDERSTORM WIND GUST.
NWS Wind Report Location: Knoxville, TN
UNK mph
May 18, 2019
10:43 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: TREE ACROSS ROAD AT THE 100 BLOCK OF RICHMOND AVENUE.
NWS Wind Report Location: 1 W Knoxville, TN
UNK mph
Nov 6, 2018
9:46 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: DAMAGE TO ROOFS IN NEW CONSTRUCTION ON RICHMOND AVENUE.
NWS Wind Report Location: Knoxville, TN
63 mph
Nov 6, 2018
9:45 AM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: PEAK WIND GUST OF 63 MPH IN WEST KNOXVILLE.
NWS Wind Report Location: Knoxville, TN
UNK mph
Jun 26, 2018
9:15 PM UTC
Wind report for ZIP 37921
Knox County · 141,465 Homes in County
Wind Report Description: SEVERAL TREES DOWN.
NWS Wind Report Location: Knoxville, TN
Showing 15 of 206
Wind Damage Risk for Your Home +

Storm reports list thunderstorm wind gusts in mph. The NWS marks storms as severe at 58+ mph, but wind damage to your home depends on roof age, shingle condition, installation, exposure, nearby trees, and prior hail or wind damage.

Below Severe
Under 58 mph
Minor

Usually little damage to a sound roof, but loose shingles, flashing, or debris may shift.

Severe
58–74 mph
Watch

Can loosen shingles, lift flashing, break limbs, and damage gutters, siding, fences, or trim.

Damaging
75–90 mph
Serious

Can peel shingles, damage vents, tear siding, rip gutters, and expose weak roof areas.

Extreme
90+ mph
Major

Can cause major roof covering loss, tree damage, broken windows, and structural damage.

Source: NOAA / National Weather Service storm reports. Gusts may be measured or estimated; actual wind damage varies by roof condition, exposure, and prior hail or wind damage.

Latest NWS Tornado Reports in and near ZIP 37921

1 reports
EF0 category
Jun 24, 2011
12:20 AM EST-5
Tornado report for ZIP 37921
Knox County · 141,465 Homes in County
Tornado Report Description: A NWS storm surveyed reported an EF-0 tornado touched along Western Avenue in Knoxville. It had a path length of around 1 mile and a path width of 100 yards. The max wind of 80 mph downed several trees and powerlines along with causing slight roof damage on 2 homes.
NWS Tornado Report Location: N West Knoxville, TN
Showing 1 of 1
Tornado Damage Risk for Your Home +

After a tornado, the National Weather Service assigns an EF rating from EF0 to EF5 based on surveyed damage. The rating estimates wind speed from what the tornado damaged, so actual damage can vary by construction quality, roof age, garage doors, windows, trees, debris, and how close the home was to the tornado path.

EF0
65–85 mph
Light

Can peel shingles, damage gutters or siding, break tree limbs, and toss loose outdoor items.

EF1
86–110 mph
Moderate

Can strip roof covering, damage exterior doors, break windows, snap trees, and cause heavier siding or gutter damage.

EF2
111–135 mph
Serious

Can tear off large sections of roofing, break or uproot trees, destroy weaker structures, and cause major exterior damage.

EF3–EF5
136+ mph
Severe

Can remove roofs and walls, destroy large portions of homes, toss vehicles, and cause severe to total destruction near the path.

Source: NOAA / National Weather Service. EF ratings are assigned after a post-storm damage survey and are based on observed damage, not a direct measurement at every home.

NWS Hail, Wind and Tornado Reports in and near ZIP 37921 on the Interactive Map

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NWS Storm Reports & Census Data

U.S. Census Data · ZIP Code

ZIP 37921 area census snapshot

People & households
Population29,064
Households11,518
Housing units12,969
Income
Median household income$57,813
$100k+ households33.5%
$150k+ households12.7%
Housing stock
Single-family detached9,143
Attached single-family689
Small multifamily1,704
Large multifamily1,082
Mobile homes341
Housing mix
Single-family share70.5%
Attached-home share5.3%
Multifamily share21.5%
Mobile-home share2.6%
Ownership & occupancy
Owner-occupied7,009
Renter-occupied4,509
Vacant units1,451
Home value & age
Median home value$204,300
Owner homes $300k+18.4%
Owner homes $500k+2.6%
Owner homes $750k+1.6%
Median year built1978
Older-home share52.3%
Vehicle context
Households with cars10,947
Free hail maps

This snapshot is for local area context only and describes the selected state, county, city, or ZIP area — not a specific home or property. For ZIP-level estimated hail impact, use Free Hail Maps to generate a hail report with key impact details for that ZIP.

Frequently asked questions

for homeowners, buyers & sellers
How many hail, wind, and tornado reports does ZIP 37921 have on record?

Our records show 55 hail, 206 wind, and 1 tornado reports in and near ZIP 37921, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on December 19, 2025.

What is the largest hail ever reported in ZIP 37921?

The largest hail size in these storm-report records in and near ZIP 37921 is 3.00″. It was reported near Knoxville, TN on May 21, 1998.

A storm report showed up near my home in ZIP 37921 — does that mean my roof is damaged?

Not necessarily. A storm report only means hail, wind, or a tornado was observed nearby; it does not confirm damage at any specific address, and conditions change from block to block. Check an address-level hail report first, and if it looks significant, find a local pro that serves ZIP 37921 and ask about a Remote Hail Inspection before anyone climbs on the roof.

I am buying a home in ZIP 37921 — why should I look at its storm history?

Recent hail or wind can leave a roof or exterior with damage that is easy to miss during a walkthrough, and a recent roof replacement is sometimes an insurance job after a storm. Reviewing the storm history for a ZIP 37921 address before closing helps you ask informed questions about roof age, past repairs, and any prior claims.

I am selling a home in ZIP 37921 — how does this help me?

Knowing the storm history for your address lets you answer buyer questions with confidence, document repairs you have already made, and decide whether a pre-listing roof check is worthwhile. A clear hail history removes a common sticking point during negotiations.

How do I check hail history for a specific ZIP 37921 address?

Use the address search to pull a free address-level hail report for any property in ZIP 37921 — no phone number or email required. It shows recent hail activity for that address so you know whether a closer roof or exterior review makes sense.

Where does this storm report data come from, and what are its limits?

Storm reports on this page are public reports from storm events in and around ZIP 37921, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported in ZIP 37921, but they do not confirm damage at any specific property. Report locations, sizes, and times may be approximate and can vary from what an individual home experienced. For property-specific hail history, use an address-level hail report or contact a participating local professional for a remote hail inspection. Pros inclusion is not an endorsement, and contacting a professional does not confirm damage at any property.

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