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NOAA/NWS STORM PREDICTION CENTER STORM REPORTS

Hail, Wind & Tornado Reports on September 17, 2021

Public hail, wind, and tornado reports across the United States on September 17, 2021 from September 17, 2021 through September 17, 2021, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Pick any date to see hail, wind and tornado public reports for that day — e.g. September 18, 2026.
Hail Reports
21
Wind Reports
36
Tornado Reports
0
Max Hail Size
3.00″
Source  NOAA SPC · NWS Local Storm Reports Coverage  United States · September 17, 2021 · 2021–present Updated  Daily · last Sep 17, 2021

NWS Hail Reports on September 17, 2021

21 reports
Free hail report for your home →
1.00″ hail
Sep 17, 2021
9:13 PM UTC
Hail report for September 17, 2021
DeKalb County · 3,206 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 3 WNW Stewartsville, MO
1.00″ hail
Sep 17, 2021
5:42 AM UTC
Hail report for September 17, 2021
Polk County · 10,621 Homes in County
Hail Report Description: REPORT OF HAIL TO BE AROUND QUARTER SIZED... POSSIBLY UP TO GOLF BALL SIZED BUT COULD NOT CONFIRM.
NWS Hail Report Location: 2 SSE Gentilly, MN
1.00″ hail
Sep 17, 2021
5:40 AM UTC
Hail report for September 17, 2021
Kanabec County · 6,047 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: Ogilvie, MN
1.50″ hail
Sep 17, 2021
5:15 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: SOCIAL MEDIA REPORT WITH PICTURE. TIME ESTIMATED BY REPORTER.
NWS Hail Report Location: Munger, MN
1.00″ hail
Sep 17, 2021
5:05 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 4 NW Hermantown, MN
1.00″ hail
Sep 17, 2021
5:00 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: REPORT RELAYED VIA SOCIAL MEDIA. SOME NICKEL SIZE HAIL WAS ALSO REPORTED... BUT QUARTERS WERE THE LARGEST SIZE.
NWS Hail Report Location: 4 SW Saginaw, MN
3.00″ hail
Sep 17, 2021
4:58 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: LARGE HAIL LED TO DAMAGE TO HOLES IN CANVAS TENTS... LARGE DENTS IN VEHICLES... AND LEAVES COMPLETELY STRIPPED OFF TREES.
NWS Hail Report Location: 5 S Saginaw, MN
1.00″ hail
Sep 17, 2021
4:55 AM UTC
Hail report for September 17, 2021
Polk County · 10,621 Homes in County
Hail Report Description: PEA SIZED HAIL IN SMALLL DRIFTS. A FEW AS LARGE AS A QUARTER TOWARDS THE END.
NWS Hail Report Location: 1 NE Climax, MN
1.00″ hail
Sep 17, 2021
4:00 AM UTC
Hail report for September 17, 2021
Grand Forks County · 14,937 Homes in County
Hail Report Description: A FEW NICKEL TO QUATER SIZED HAIL IN VERY HEAVY RAIN.
NWS Hail Report Location: 1 WSW Manvel, ND
1.50″ hail
Sep 17, 2021
3:45 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: REPORT VIA SOCIAL MEDIA WITH PICTURE. TIME ESTIMATED VIA REPORTER AND RADAR.
NWS Hail Report Location: 2 WSW Fredenberg, MN
1.00″ hail
Sep 17, 2021
3:30 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: REPORT VIA SOCIAL MEDIA WITH IMAGE.
NWS Hail Report Location: 1 NE Twig, MN
1.00″ hail
Sep 17, 2021
3:28 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: RELAYED VIA SOCIAL MEDIA WITH PICTURE.
NWS Hail Report Location: 3 NE Twig, MN
1.00″ hail
Sep 17, 2021
3:15 AM UTC
Hail report for September 17, 2021
St. Louis County · 77,023 Homes in County
Hail Report Description: REPORT VIA SOCIAL MEDIA WITH IMAGE.
NWS Hail Report Location: 4 ENE Island Lake, MN
1.00″ hail
Sep 17, 2021
3:10 AM UTC
Hail report for September 17, 2021
Codington County · 9,189 Homes in County
Hail Report Description: TIME ESTIMATED BASED ON RADAR. HAIL MAY HAVE BEEN A LITTLE LARGER... ENOUGH TO DENT VEHICLES.
NWS Hail Report Location: 9 WNW South Shore, SD
1.00″ hail
Sep 17, 2021
3:05 AM UTC
Hail report for September 17, 2021
Walsh County · 3,971 Homes in County
Hail Report Description: A FEW HAIL UP TO QUARTER SIZED. TIME ESTIMATED BASED ON RADAR.
NWS Hail Report Location: 6 ENE Park River, ND
Showing 15 of 21
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.

NWS Wind Reports on September 17, 2021

36 reports
Free hail report + wind check →
UNK mph
Sep 17, 2021
4:58 PM UTC
Wind report for September 17, 2021
Minnehaha County · 51,798 Homes in County
Wind Report Description: SPOTTER SENT PICTURES OF MULTIPLE DAMAGED TREES AND BLOWN OVER UTILITY TRAILERS.
NWS Wind Report Location: Humboldt, SD
UNK mph
Sep 17, 2021
8:55 AM UTC
Wind report for September 17, 2021
Ramsey County · 120,678 Homes in County
Wind Report Description: TREE TRANCHES DOWN.
NWS Wind Report Location: 2 N Newport, MN
60 mph
Sep 17, 2021
8:53 AM UTC
Wind report for September 17, 2021
Ramsey County · 120,678 Homes in County
Wind Report Description: ASOS STATION KSTP ST. PAUL DWTN AP.
NWS Wind Report Location: 2 ESE St. Paul, MN
UNK mph
Sep 17, 2021
8:37 AM UTC
Wind report for September 17, 2021
St. Croix County · 28,175 Homes in County
Wind Report Description: APPROXIMATELY 10 INCH DIAMETER TREE SNAPPED NEAR BASE. TIME ESTIMATED FROM RADAR.
NWS Wind Report Location: 4 W Roberts, WI
UNK mph
Sep 17, 2021
8:34 AM UTC
Wind report for September 17, 2021
St. Croix County · 28,175 Homes in County
Wind Report Description: TWITTER PICTURE OF 1/2 TO 1 INCH TREE LIMBS DOWN. TIME ESTIMATED BY RADAR.
NWS Wind Report Location: 4 W Roberts, WI
UNK mph
Sep 17, 2021
8:29 AM UTC
Wind report for September 17, 2021
St. Croix County · 28,175 Homes in County
Wind Report Description: MULTIPLE TREES DOWN/UPROOTED IN HUDSON.
NWS Wind Report Location: Hudson, WI
UNK mph
Sep 17, 2021
8:17 AM UTC
Wind report for September 17, 2021
Dakota County · 103,139 Homes in County
Wind Report Description: TIME ESTIMATED FROM RADAR. MANY TREES REPORTED DOWN.
NWS Wind Report Location: Rosemount, MN
58 mph
Sep 17, 2021
8:16 AM UTC
Wind report for September 17, 2021
Scott County · 40,267 Homes in County
Wind Report Description: MESONET STATION AU778 ELKO NEW MARKET.
NWS Wind Report Location: 1 S Elko New Market, MN
UNK mph
Sep 17, 2021
8:15 AM UTC
Wind report for September 17, 2021
Scott County · 40,267 Homes in County
Wind Report Description: SMALL TREE LIMBS DOWN... HOME WEATHER STATION RECORDED 58MPH GUST.
NWS Wind Report Location: 1 S Savage, MN
UNK mph
Sep 17, 2021
8:13 AM UTC
Wind report for September 17, 2021
Dakota County · 103,139 Homes in County
Wind Report Description: 3 LARGE TREES UPROOTED. TIME ESTIMATED FROM RADAR.
NWS Wind Report Location: 4 NNW Rosemount, MN
UNK mph
Sep 17, 2021
8:13 AM UTC
Wind report for September 17, 2021
Dakota County · 103,139 Homes in County
Wind Report Description: TIME ESTIMATED FROM RADAR. NUMEROUS LARGE TREES DOWN. ONE ON THE FRONT OF A HOUSE AND ONE ON TOP OF TWO CARS.
NWS Wind Report Location: 4 S Eagan, MN
UNK mph
Sep 17, 2021
8:11 AM UTC
Wind report for September 17, 2021
Dakota County · 103,139 Homes in County
Wind Report Description: MULTIPLE TREES DOWN/UPROOTED IN EAGAN. TIME ESTIMATED FROM RADAR.
NWS Wind Report Location: Eagan, MN
64 mph
Sep 17, 2021
8:09 AM UTC
Wind report for September 17, 2021
Hennepin County · 294,886 Homes in County
Wind Report Description: 64MPH WIND GUST MEASURED AT MSP INTERNATIONAL AIRPORT.
NWS Wind Report Location: 3 E Richfield, MN
UNK mph
Sep 17, 2021
8:08 AM UTC
Wind report for September 17, 2021
Dakota County · 103,139 Homes in County
Wind Report Description: 4-6 INCH TREE LIMBS DOWN OVER ROADWAYS. PICTURE VIA TWITTER. TIME ESTIMATED VIA RADAR.
NWS Wind Report Location: 4 S Eagan, MN
UNK mph
Sep 17, 2021
8:06 AM UTC
Wind report for September 17, 2021
Hennepin County · 294,886 Homes in County
Wind Report Description: MULTIPLE TREES DOWN/UPROOTED IN RICHFIELD. TIME ESTIMATED.
NWS Wind Report Location: Richfield, MN
Showing 15 of 36
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.

NWS Tornado Reports on September 17, 2021

0 reports

No tornado reports were found for this selection.

Showing 0 of 0
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 on September 17, 2021 on the Interactive Map

Report type
Hail
Wind
Tornado

Get a Remote Hail Inspection

Not sure if hail may have affected your home on September 17, 2021? Ask a local pro for a Remote Hail Inspection. They can review hail activity for your property and help you decide whether an in-person roof or exterior inspection makes sense.

Frequently asked questions

for homeowners, buyers & sellers
How many storm reports were recorded on September 17, 2021?

Our records show 21 hail, 36 wind, and 0 tornado reports on September 17, 2021, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on September 17, 2021.

What was the largest hail reported on September 17, 2021?

The largest hail size in these storm-report records on September 17, 2021 is 3.00″, reported near Saginaw, MN.

Some reports show UNK instead of a wind speed or tornado rating — what does that mean?

Wind reports come three ways: measured from an instrument, estimated from the damage observed, or UNK when no speed was recorded. Tornadoes show UNK until the National Weather Service finishes a damage survey and assigns an EF rating. UNK simply means that value was not available when the report was filed.

A report appeared near my home on September 17, 2021 — is my roof damaged?

Not necessarily. A storm report shows that hail, wind, or a tornado was observed nearby, not that any specific home was hit. To find out whether your property was affected, check an address-level hail report, and if it looks significant, ask a local pro about a Remote Hail Inspection before scheduling roof work.

I am buying or selling a home — how do these on September 17, 2021 reports help?

If a storm passed through, a roof or exterior may have damage that is hard to see, or a recent repair may trace back to it. Buyers can ask better questions before closing, and sellers can document the home condition up front — both starting from the property address rather than a whole region.

How do I check what happened at a specific address on September 17, 2021?

Use the address search to pull a free address-level hail report for any property — 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 on September 17, 2021 across the United States, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported, 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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