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

Hail, Wind & Tornado Reports in and near Knoxville, IA

Public hail, wind, and tornado reports in and near Knoxville, IA from May 21, 1957 through July 4, 2026, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Example: 50138 — search hail, wind and tornado public reports for any U.S. ZIP code 
Hail Reports
69
Wind Reports
94
Tornado Reports
7
Max Hail Size
2.75″
Source  NOAA SPC · NWS Local Storm Reports Coverage  Knoxville, IA · 1957–present Updated  Daily · last Jul 4, 2026

Latest NWS Hail Reports in and near Knoxville, IA

30 reports
Free hail report for your home →
1.50″ hail
Jun 11, 2026
1:00 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Delayed report - time estimated from radar.
NWS Hail Report Location: 2 N Attica, IA
1.75″ hail
Jun 11, 2026
12:58 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Report relayed from NWS Chat.
NWS Hail Report Location: Knoxville, IA
1.75″ hail
Jun 11, 2026
12:58 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Report relayed from NWS Chat.
NWS Hail Report Location: 1 SSW Knoxville, IA
1.00″ hail
Jun 11, 2026
12:55 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Time estimated from radar.
NWS Hail Report Location: 2 S Knoxville, IA
1.00″ hail
Jun 11, 2026
12:15 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 1 NNW Knoxville, IA
1.75″ hail
Jun 11, 2026
12:02 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Pershing IOWA.
NWS Hail Report Location: 2 N Attica, IA
1.00″ hail
Jun 6, 2026
4:40 AM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Report from mPING: Quarter (1.00 in.).
NWS Hail Report Location: 2 N Attica, IA
1.00″ hail
Jun 6, 2026
4:39 AM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Report from mPING: Quarter (1.00 in.).
NWS Hail Report Location: 2 N Attica, IA
1.00″ hail
Apr 17, 2026
7:25 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 1 E Knoxville, IA
1.00″ hail
May 19, 2025
8:58 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 3 SW Knoxville, IA
1.00″ hail
Oct 4, 2024
7:35 AM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Relayed from local radio. Time estimated from radar.
NWS Hail Report Location: 5 WNW Attica, IA
1.00″ hail
Jul 29, 2023
4:24 AM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Largest stones were quarter sized.
NWS Hail Report Location: 2 N Attica, IA
1.00″ hail
Jul 17, 2023
12:53 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: Relayed via KNIA/KRLS radio.
NWS Hail Report Location: Knoxville, IA
1.00″ hail
May 13, 2023
8:26 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: FROM KNIA/KRLS RADIO AT THEIR STUDIOS.
NWS Hail Report Location: 1 NNW Knoxville, IA
1.00″ hail
Mar 31, 2023
8:22 PM UTC
Hail report for Knoxville, IA
Marion County · 11,140 Homes in County
Hail Report Description: IMAGE SUBMITTED VIA SOCIAL MEDIA.
NWS Hail Report Location: Knoxville, IA
Showing 15 of 30
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 Knoxville, IA

30 reports
Free hail report + wind check →
62 mph
Jul 4, 2026
7:40 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: No National Weather Service description provided.
NWS Wind Report Location: 2 SSW Knoxville, IA
61 mph
Jun 11, 2026
12:57 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: No National Weather Service description provided.
NWS Wind Report Location: 2 SSW Knoxville, IA
70 mph
Jun 6, 2026
4:18 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: Measured from personal weather station.
NWS Wind Report Location: Knoxville, IA
UNK mph
Mar 14, 2025
10:37 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: Power poles snapped off in Knoxville - time estimated.
NWS Wind Report Location: Knoxville, IA
UNK mph
May 24, 2024
10:26 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: Picture of large tree down on house in Pershing. Time estimated with radar.
NWS Wind Report Location: 3 N Attica, IA
UNK mph
May 7, 2024
6:34 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: Emergency manager reported a tree fallen on a home. Power lines also down in the area. Time estimated from radar.
NWS Wind Report Location: 3 NW Attica, IA
UNK mph
Mar 31, 2023
9:25 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: LARGE TREE BRANCH DOWN ON HOME.
NWS Wind Report Location: Knoxville, IA
64 mph
Dec 16, 2021
12:55 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: AWOS STATION KOXV KNOXVILLE AIRPORT.
NWS Wind Report Location: 3 SSW Knoxville, IA
UNK mph
Aug 10, 2021
8:25 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: WHO-TV VIEWER SHARED PICTURE OF DOWN TREE BRANCHES AND LIMBS... A FEW GREATER THAN 3 INCHES IN DIAMETER.
NWS Wind Report Location: 3 SSW Lake Red Rock, IA
UNK mph
Aug 10, 2021
8:24 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: WHO-TV VIEWER SHARED PICTURES OF LARGE TREE LIMBS GREATER THAN 3 INCHES IN DIAMETER... OUTBUILDING WITH SUBSTANTIAL DAMAGE.
NWS Wind Report Location: 3 SSW Lake Red Rock, IA
UNK mph
Jun 19, 2021
4:05 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: LARGE TREE KNOCKED DOWN. REPORT VIA SOCIAL MEDIA.
NWS Wind Report Location: 2 N Knoxville, IA
71 mph
Aug 10, 2020
4:35 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: AWOS STATION KOXV KNOXVILLE AIRPORT.
NWS Wind Report Location: 3 SSW Knoxville, IA
UNK mph
Jun 6, 2020
10:32 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: TRAINED SPOTTER REPORTED LARGE BRANCHES AND TREE DOWNED AT RELATIVES PROPERTY. DAMAGE INCLUDES GARAGE AND POWER LINE DOWN FROM TREE DAMAGE. DISTANCE FROM MELCHER-DALLAS ESTIMATED BY SPOTTER. TIME ESTIMATED FROM RADAR.
NWS Wind Report Location: 5 W Attica, IA
UNK mph
Aug 20, 2019
11:40 AM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: SEMI WAS BLOWN OVER ON MILE LONG BRIDGE NORTH OF KNOXVILLE. TIME ESTIMATED.
NWS Wind Report Location: 1 WNW Lake Red Rock, IA
68 mph
Jul 20, 2019
11:15 PM UTC
Wind report for Knoxville, IA
Marion County · 11,140 Homes in County
Wind Report Description: AWOS STATION KOXV KNOXVILLE AIRPORT.
NWS Wind Report Location: 3 SSW Knoxville, IA
Showing 15 of 30
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 Knoxville, IA

7 reports
UNK category
May 13, 2023
11:50 PM UTC
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: MULTIPLE STORM CHASERS REPORT BRIEF TORNADO TOUCHDOWN IN OPEN FIELDS.
NWS Tornado Report Location: 4 WNW Knoxville, IA
UNK category
May 13, 2023
8:24 PM UTC
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: 4 NE Knoxville, IA
UNK category
Mar 8, 2017
1:40 AM UTC
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: POSSIBLE TORNADO - FRONT PORCH BLOWN OFF. WINDOWS BLOWN OUT. PINE TREES SHEARED OFF THE TOP. DAMAGE TOWARD ILLINOIS DR. .
NWS Tornado Report Location: 2 S Lake Red Rock, IA
UNK category
Mar 8, 2017
1:30 AM UTC
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: TRAINED SPOTTER REPORTS SMALL TORNADO ON THE GROUND SEEN DURING LIGHTNING.
NWS Tornado Report Location: 2 W Knoxville, IA
EF1 category
Nov 11, 2015
3:42 PM CST-6
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: A high-end EF-1 tornado touched down southwest of Knoxville and traveled through the southeast side of town. Damage occurred along its path through town. One injury was reported.
NWS Tornado Report Location: .91 SW Knoxville Arpt, IA
EF2 category
May 30, 2008
4:07 AM CST-6
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: Several homes were damaged or destroyed, two mobile homes were destroyed. Considerable tree damage was reported. The EF2 damage occurred in the Attica area, along with 10 injuries. The tornado moved out of Marion County into Mahaska County.
NWS Tornado Report Location: 3.79 NNE Columbia, IA
F1 category
May 18, 1971
2:15 PM CST
Tornado report for Knoxville, IA
Marion County · 11,140 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: Not provided, IA
Showing 7 of 7
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 Knoxville, IA on the Interactive Map

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Browse ZIP Codes with NWS Storm Reports in Knoxville

50138 189
Knoxville, IA Hail, wind & tornado reports

NWS Storm Reports & Census Data

U.S. Census Data · City

Knoxville, IA area census snapshot

People & households
Population7,493
Households3,195
Housing units3,463
Income
Median household income$70,136
$100k+ households40.8%
$150k+ households16.2%
Housing stock
Single-family detached2,679
Attached single-family59
Small multifamily487
Large multifamily67
Mobile homes165
Housing mix
Single-family share77.4%
Attached-home share1.7%
Multifamily share16%
Mobile-home share4.8%
Ownership & occupancy
Owner-occupied2,374
Renter-occupied821
Vacant units268
Home value & age
Median home value$147,600
Owner homes $300k+15.3%
Owner homes $500k+5.9%
Owner homes $750k+0.2%
Median year built1965
Older-home share73.8%
Vehicle context
Households with cars3,058
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 Knoxville have on record?

Our records show 69 hail, 94 wind, and 7 tornado reports in and near Knoxville, IA, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on July 4, 2026.

What is the largest hail ever reported in Knoxville?

The largest hail size in these storm-report records in and near Knoxville, IA is 2.75″. It was reported near Knoxville, IA on June 16, 2017.

A storm report showed up near my home in Knoxville — 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 Knoxville and ask about a Remote Hail Inspection before anyone climbs on the roof.

I am buying a home in Knoxville — 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 Knoxville address before closing helps you ask informed questions about roof age, past repairs, and any prior claims.

I am selling a home in Knoxville — 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 Knoxville address?

Use the address search to pull a free address-level hail report for any property in Knoxville — 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 across Knoxville, IA, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported in Knoxville, 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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