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NOAA/NWS STORM PREDICTION CENTER STORM REPORTS

Hail, Wind & Tornado Reports on August 20, 2021

Public hail, wind, and tornado reports across the United States on August 20, 2021 from August 20, 2021 through August 20, 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
7
Wind Reports
41
Tornado Reports
9
Max Hail Size
2.00″
Source  NOAA SPC · NWS Local Storm Reports Coverage  United States · August 20, 2021 · 2021–present Updated  Daily · last Aug 20, 2021

NWS Hail Reports on August 20, 2021

7 reports
Free hail report for your home →
1.50″ hail
Aug 20, 2021
10:36 PM UTC
Hail report for August 20, 2021
Thayer County · 2,344 Homes in County
Hail Report Description: DELAYED FACEBOOK REPORT OF HAIL TO AT LEAST PING PONG BALL SIZE. TIME ESTIMATED FROM RADAR.
NWS Hail Report Location: 6 SSE Davenport, NE
1.00″ hail
Aug 20, 2021
10:26 PM UTC
Hail report for August 20, 2021
Ottawa County · 2,335 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 4 ENE Ada, KS
1.50″ hail
Aug 20, 2021
9:36 PM UTC
Hail report for August 20, 2021
Thayer County · 2,344 Homes in County
Hail Report Description: CORRECTS TIME OF PREVIOUS HAIL REPORT FROM 6 SSE DAVENPORT. DELAYED FACEBOOK REPORT OF HAIL TO AT LEAST PING PONG BALL SIZE. TIME ESTIMATED FROM RADAR.
NWS Hail Report Location: 6 SSE Davenport, NE
1.00″ hail
Aug 20, 2021
2:40 AM UTC
Hail report for August 20, 2021
Yuma County · 3,428 Homes in County
Hail Report Description: PEA TO QUARTER SIZE HAIL FELL.
NWS Hail Report Location: 4 NNE Wray, CO
2.00″ hail
Aug 20, 2021
1:00 AM UTC
Hail report for August 20, 2021
Chase County · 1,606 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 4 N Lamar, NE
1.00″ hail
Aug 20, 2021
12:57 AM UTC
Hail report for August 20, 2021
Yuma County · 3,428 Homes in County
Hail Report Description: PEA TO QUARTER SIZE HAIL WITH ONE INCH OF RAIN. RELAYED BY EM.
NWS Hail Report Location: Clarkville, CO
1.00″ hail
Aug 20, 2021
12:43 AM UTC
Hail report for August 20, 2021
Yuma County · 3,428 Homes in County
Hail Report Description: TRAINED SPOTTER REPORTED HAIL RANGING IN SIZE FROM PEAS TO QUARTERS.
NWS Hail Report Location: 6 WSW Clarkville, CO
Showing 7 of 7
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 August 20, 2021

41 reports
Free hail report + wind check →
UNK mph
Aug 20, 2021
11:54 PM UTC
Wind report for August 20, 2021
Dickinson County · 7,784 Homes in County
Wind Report Description: 1 FEET IN DIAMETER TREES BLOWN DOWN... KDOT SIGNS BLOWN DOWN.
NWS Wind Report Location: 2 N Abilene, KS
71 mph
Aug 20, 2021
11:44 PM UTC
Wind report for August 20, 2021
Washington County · 2,454 Homes in County
Wind Report Description: PERSONAL WEATHER STATION: KKSHOLLE1.
NWS Wind Report Location: 2 SSW Hollenburg, KS
UNK mph
Aug 20, 2021
11:34 PM UTC
Wind report for August 20, 2021
Saline County · 18,033 Homes in County
Wind Report Description: DAMAGED POWERLINES WERE REPORTED FROM THE PUBLIC A LONG WITH A PICTURE OF THE DAMAGE.
NWS Wind Report Location: 2 SW Smolan, KS
60 mph
Aug 20, 2021
11:31 PM UTC
Wind report for August 20, 2021
Saline County · 18,033 Homes in County
Wind Report Description: ASOS STATION KSLN SALINA REGIONAL AIRPORT.
NWS Wind Report Location: 3 SW Salina, KS
UNK mph
Aug 20, 2021
11:22 PM UTC
Wind report for August 20, 2021
Cherokee County · 4,718 Homes in County
Wind Report Description: DELAYED REPORT VIA SOCIAL MEDIA. LARGE TREE BRANCH ESTIMATED AT 10 INCHES IN DIAMETER BROKEN. SOME DAMAGE TO CORN CROP ALSO NOTED.
NWS Wind Report Location: 3 W Washta, IA
UNK mph
Aug 20, 2021
11:16 PM UTC
Wind report for August 20, 2021
Woodbury County · 31,632 Homes in County
Wind Report Description: LARGE TREE SNAPPED. ALSO HAD 6 INCH DIAMETER TREE BRANCHES DOWN.
NWS Wind Report Location: Pierson, IA
67 mph
Aug 20, 2021
11:01 PM UTC
Wind report for August 20, 2021
Rice County · 3,848 Homes in County
Wind Report Description: AWOS STATION KLYO LYONS RICE CO. MUNICIPAL AIRPT.
NWS Wind Report Location: 2 W Lyons, KS
60 mph
Aug 20, 2021
10:55 PM UTC
Wind report for August 20, 2021
Ottawa County · 2,335 Homes in County
Wind Report Description: SPOTTER ESTIMATED 50-60MPH WIND GUSTS.
NWS Wind Report Location: 6 N Wells, KS
UNK mph
Aug 20, 2021
10:45 PM UTC
Wind report for August 20, 2021
Dade County · 3,050 Homes in County
Wind Report Description: SEVERE THUNDERSTORM WIND GUSTS SNAPPED SOME TREE LIMBS OFF.
NWS Wind Report Location: 3 E Everton, MO
65 mph
Aug 20, 2021
10:40 PM UTC
Wind report for August 20, 2021
Thayer County · 2,344 Homes in County
Wind Report Description: ESTIMATED 60-70 MPH WINDS ALONG HIGHWAY 136.
NWS Wind Report Location: 3 W Gilead, NE
UNK mph
Aug 20, 2021
10:30 PM UTC
Wind report for August 20, 2021
Polk County · 10,621 Homes in County
Wind Report Description: LARGE ASH AND COTTONWOOD BRANCHES BLOWN DOWN IN A SHELTER BELT. TIME ESTIMATED BASED ON RADAR.
NWS Wind Report Location: 5 W Eldred, MN
UNK mph
Aug 20, 2021
10:25 PM UTC
Wind report for August 20, 2021
Otter Tail County · 29,682 Homes in County
Wind Report Description: LARGE TREE BLOWN DOWN. TIME ESTIMATED BASED ON RADAR.
NWS Wind Report Location: 2 N Almora, MN
70 mph
Aug 20, 2021
10:05 PM UTC
Wind report for August 20, 2021
Traill County · 2,786 Homes in County
Wind Report Description: No National Weather Service description provided.
NWS Wind Report Location: 1 W Cummings, ND
70 mph
Aug 20, 2021
10:05 PM UTC
Wind report for August 20, 2021
Traill County · 2,786 Homes in County
Wind Report Description: SPOTTER ESTIMATED WIND GUST OF 70 MPH ON I-29 SOUTH OF CUMMINGS ND. SPOTTERS CAR OSCILLATING/VIBRATING AND NEARBY SEMI STRUGGLED TO REMAIN UPRIGHT.
NWS Wind Report Location: 1 S Cummings, ND
60 mph
Aug 20, 2021
9:51 PM UTC
Wind report for August 20, 2021
Douglas County · 17,141 Homes in County
Wind Report Description: ASOS STATION KAXN ALEXANDRIA MN ASOS.
NWS Wind Report Location: 2 SW Alexandria, MN
Showing 15 of 41
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 August 20, 2021

9 reports
UNK category
Aug 20, 2021
11:51 PM UTC
Tornado report for August 20, 2021
Stearns County · 45,866 Homes in County
Tornado Report Description: BRIEF TOUCHDOWN.
NWS Tornado Report Location: 2 NNE Belgrade, MN
UNK category
Aug 20, 2021
11:30 PM UTC
Tornado report for August 20, 2021
Stearns County · 45,866 Homes in County
Tornado Report Description: BRIEF TORNADO TOUCHDOWN ABOUT 2 MILES SOUTH OF... AND BETWEEN... BELGRADE AND BROOTEN.
NWS Tornado Report Location: 4 WSW Belgrade, MN
UNK category
Aug 20, 2021
9:18 PM UTC
Tornado report for August 20, 2021
Cass County · 37,232 Homes in County
Tornado Report Description: A FUNNEL WITH BRIEF TOUCHDOWN. REPORT POSTED VIA SOCIAL MEDIA. SOME TREE BRANCHES AND CORN STALKS WERE SEEN SWIRLING IN THE DEBRIS. PEAK WINDS ESTIMATED TO 70 MPH. MAXIMUM WIDTH TO 40 YARDS. TRACK LENGTH OF LESS THAN ONE HALF MILE TO THE EAST-NORTHEAST BY 419 PM CDT.
NWS Tornado Report Location: 4 E Erie, ND
UNK category
Aug 20, 2021
9:18 PM UTC
Tornado report for August 20, 2021
Cass County · 37,232 Homes in County
Tornado Report Description: A FUNNEL WITH BRIEF TOUCHDOWN. REPORT POSTED VIA SOCIAL MEDIA. SOME TREE BRANCHES AND CORN STALKS WERE SEEN SWIRLING IN THE DEBRIS. PEAK WINDS ESTIMATED TO 70 MPH. MAXIMUM WIDTH TO 40 YARDS. TRACK LENGTH OF LESS THAN ONE QUARTER MILE TO THE EAST-NORTHEAST BY 419 PM CDT.
NWS Tornado Report Location: 4 E Erie, ND
UNK category
Aug 20, 2021
8:40 PM UTC
Tornado report for August 20, 2021
Osceola County · 2,478 Homes in County
Tornado Report Description: DELAYED REPORT. EMERGENCY MANAGER REPORTS TORNADO DAMAGE TO AN OUTBUILDING AT A FARM AS WELL AS DAMAGE TO A COUPLE TREES. DRONE VIDEO SHOWS THE TORNADO PATH THROUGH A CROP FIELD LEADING TO THE FARMSTEAD.
NWS Tornado Report Location: 3 SSW Sibley, IA
UNK category
Aug 20, 2021
6:38 AM UTC
Tornado report for August 20, 2021
Morris County · 129,288 Homes in County
Tornado Report Description: EF0 WITH ESTIMATED PEAK WINDS UP TO 85 MPH. ANOTHER VELOCITY COUPLET FORMED IN MORRIS COUNTY EARLY IN THE MORNING OF AUGUST 19TH IN ASSOCIATION WITH THUNDERSTORMS AS THE REMNANTS OF TROPICAL STORM FRED MOVED ACROSS THE REGION. A WEAK TORNADO FORMED FROM THIS COUPLET... FIRST TOUCHING DOWN ALONG MOUNT PLEASANT AVENUE AND IRWIN PLACE IN ROCKAWAY TOWNSHIP... NEW JERSEY... WHERE SEVERAL SMALL BRANCHES AND A PORTION OF A VINYL FENCE WERE BROUGHT DOWN. FROM THERE... THE TORNADO MOVED THROUGH A SUBDIVISION... BRINGING DOWN SEVERAL SMALL PINE TREES AND BRANCHES ALONG LENOX ROAD... ARLENE DRIVE... AND MILLER AVENUE. A FEW SMALL BRANCHES WERE THEN BROUGHT DOWN AS THE TORNADO PROCEEDED NORTHEAST ACROSS FLEETWOOD DRIVE. THE TORNADO THEN CROSSED INTERSTATE 80... SNAPPING SEVERAL TREES ALONG RESERVOIR AND KATHERINE ROAD. A FEW LARGE BRANCHES WERE ALSO KNOCKED DOWN IN THIS AREA AS THE TORNADO LIFTED.
NWS Tornado Report Location: 1 W Rockaway, NJ
UNK category
Aug 20, 2021
4:25 AM UTC
Tornado report for August 20, 2021
Montgomery County · 186,982 Homes in County
Tornado Report Description: EF1 WITH ESTIMATED PEAK WINDS UP TO 105 MPH. A LINE OF THUNDERSTORMS MOVED ACROSS MONTGOMERY AND BUCKS COUNTIES EARLY ON THE MORNING OF AUGUST 19TH AS THE REMNANTS OF TROPICAL STORM FRED MOVED ACROSS CENTRAL PENNSYLVANIA. WHAT STARTED AS A FAIRLY QUIET DAY FOR OUR CWA QUICKLY BECAME BUSY AS NIGHT FELL. AS A VELOCITY COUPLET FORMED ACROSS MONTGOMERY COUNTY... A TORNADO FORMED ROUGHLY A MILE AND A HALF SOUTH OF SOUDERTON... PA AROUND 12:25 AM EDT... WHERE IT BROUGHT DOWN A TREE BRANCH AND TORE SIDING OFF OF A RESIDENCE ON GARRISON LANE. FROM THERE... THE TORNADO APPEARS TO HAVE LIFTED BRIEFLY BEFORE BRINGING DOWN A FEW SMALL TREES AND BRANCHES ALONG TOWNSHIP LINE ROAD. THE TORNADO THEN BROUGHT DOWN SEVERAL TREES AND BRANCHES IN THE HIDDEN SPRINGS MOBILE HOME COMMUNITY. HERE... SEVERAL TREES WERE BROUGHT DOWN ON HOMES AND ACROSS ROADWAYS WHILE ALSO LEADING TO MINOR DAMAGE TO THE ROOFS AND SIDING OF SEVERAL RESIDENCES IN THE COMMUNITY. THE TORNADO THEN PROCEEDED NORTHEASTWARD INTO HILLTOWN TOWNSH
NWS Tornado Report Location: 1 WNW Hatfield, PA
UNK category
Aug 20, 2021
1:15 AM UTC
Tornado report for August 20, 2021
Berks County · 96,137 Homes in County
Tornado Report Description: EF1 WITH PEAK WINDS UP TO 95 MPH. THE TORNADO TOUCHED DOWN ALONG FISHER DAM ROAD ABOUT 800 FEET NORTH OF THE INTERSECTION WITH BERNE ROAD. NUMEROUS HARDWOOD TREE TRUNKS WERE SNAPPED ON THE WESTERN SIDE OF THE ROAD WITH A CONVERGENT DEBRIS PATTERN. A CORN FIELD ON THE EAST SIDE OF THE ROAD IN THE SAME LOCATION WAS DAMAGED WITH STALKS OF CORN FELLED IN A CONVERGENT PATTERN. FURTHER NORTH ON FISHER DAM ROAD... HARDWOOD TREE DAMAGE WAS NOTED... BUT IT WAS MORE SPORADIC. ADDITIONAL DAMAGE WAS NOTED ABOUT A HALF-MILE NORTH OF THE INTERSECTION OF BERNE ROAD AND HILL DRIVE... INCLUDING NUMEROUS TREES SNAPPED ON THE EAST SIDE OF BERNE ROAD. A LITTLE FARTHER NORTH... ABOUT 450 FEET SOUTH OF THE INTERSECTION WITH ASH ROAD... A UTILITY POLE WAS SNAPPED... AND HARDWOOD TREES WERE SNAPPED BOTH ON THE WESTERN SIDE AND THE EASTERN SIDE OF THE ROAD WITH CONVERGENT DEBRIS PATTERNS NOTED. THERE WAS DAMAGE ON ASH ROAD... INCLUDING A ROOF THAT WAS REMOVED FROM A PORCH AND THE ROOF DAMAGE EXTENDED INTO THE MAIN ROOF O
NWS Tornado Report Location: 2 SSW Hamburg, PA
UNK category
Aug 20, 2021
12:47 AM UTC
Tornado report for August 20, 2021
Saluda County · 6,170 Homes in County
Tornado Report Description: A NATIONAL WEATHER SERVICE STORM SURVEY TEAM CONFIRMED A VERY WEAK EF0 TORNADO... WITH PEAK WINDS OF 65 MPH... NORTH OF HOLTSON CROSSROADS IN SALUDA COUNTY... SC. THE TORNADO VERY BRIEFLY TOUCHED DOWN NEAR THE INTERSECTION OF DOUBLE BRIDGES ROAD AND WEST CREEK ROAD... WHERE IT SNAPPED A COUPLE OF TREES. THE SURVEY TEAM WAS NOT ABLE TO CONFIRM ANY ADDITIONAL DAMAGE IN THE IMMEDIATE VICINITY DUE TO A LACK OF ACCESS FROM THE GROUND. HOWEVER... IT APPEARS THAT THE DAMAGE DID NOT EXTEND TO HOMES ON RABBIT LANE TO THE EAST.
NWS Tornado Report Location: 5 NNW Batesburg, SC
Showing 9 of 9
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 August 20, 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 August 20, 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 August 20, 2021?

Our records show 7 hail, 41 wind, and 9 tornado reports on August 20, 2021, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on August 20, 2021.

What was the largest hail reported on August 20, 2021?

The largest hail size in these storm-report records on August 20, 2021 is 2.00″, reported near Lamar, NE.

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 August 20, 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 August 20, 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 August 20, 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 August 20, 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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