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NOAA/NWS STORM PREDICTION CENTER STORM REPORTS

Hail, Wind & Tornado Reports on August 21, 2018

Public hail, wind, and tornado reports across the United States on August 21, 2018 from August 21, 2018 through August 21, 2018, 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
2
Wind Reports
54
Tornado Reports
3
Max Hail Size
1.00″
Source  NOAA SPC · NWS Local Storm Reports Coverage  United States · August 21, 2018 · 2018–present Updated  Daily · last Aug 21, 2018

NWS Hail Reports on August 21, 2018

2 reports
Free hail report for your home →
1.00″ hail
Aug 21, 2018
6:30 PM UTC
Hail report for August 21, 2018
Mesa County · 49,052 Homes in County
Hail Report Description: WINDS WERE ESTIMATED NEAR 60 MPH AND THE PARK IS REPORTING NUMEROUS TREE LIMBS DOWN.
NWS Hail Report Location: Loma 5Nnw, CO
1.00″ hail
Aug 21, 2018
12:15 AM UTC
Hail report for August 21, 2018
Cass County · 13,385 Homes in County
Hail Report Description: SOCIAL MEDIA REPORT FORWARDED FROM WSBT.
NWS Hail Report Location: 4 SW Grass Creek, IN
Showing 2 of 2
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 21, 2018

54 reports
Free hail report + wind check →
62 mph
Aug 21, 2018
11:44 PM UTC
Wind report for August 21, 2018
Alamosa County · 4,568 Homes in County
Wind Report Description: No National Weather Service description provided.
NWS Wind Report Location: 2 S Alamosa, CO
UNK mph
Aug 21, 2018
11:30 PM UTC
Wind report for August 21, 2018
Rowan County · 45,278 Homes in County
Wind Report Description: TRAINED SPOTTER REPORTED A TREE DOWN ON AN APARTMENT BUILDING ON ACADEMY ST.
NWS Wind Report Location: Cleveland, NC
UNK mph
Aug 21, 2018
11:06 PM UTC
Wind report for August 21, 2018
Cattaraugus County · 28,006 Homes in County
Wind Report Description: TREE DOWN AT THE QUAKER ENTRANCE OF ALLEGANY STATE PARK
NWS Wind Report Location: 4 SSE Steamburg, NY
UNK mph
Aug 21, 2018
10:35 PM UTC
Wind report for August 21, 2018
Berkeley County · 35,174 Homes in County
Wind Report Description: POWER LINES DOWN ON QUARTER DRIVE NEAR CURRENCY DRIVE.
NWS Wind Report Location: 2 SE Inwood, WV
UNK mph
Aug 21, 2018
10:05 PM UTC
Wind report for August 21, 2018
Washington County · 39,808 Homes in County
Wind Report Description: DOWNED TREE ON BOTTOM RD NEAR WILLIAMSPORT
NWS Wind Report Location: Hagerstown, MD
UNK mph
Aug 21, 2018
9:40 PM UTC
Wind report for August 21, 2018
Anderson County · 65,340 Homes in County
Wind Report Description: A TREE DOWN JUST OFF HIGHWAY 252 NEAR THE PATRICK HARRIS HOSPITAL.
NWS Wind Report Location: 5 ESE Anderson, SC
UNK mph
Aug 21, 2018
9:39 PM UTC
Wind report for August 21, 2018
Anderson County · 65,340 Homes in County
Wind Report Description: A TREE DOWN ON POWER LINES AT INTERSECTION OF SNOW ROAD AND AMBER DRIVE.
NWS Wind Report Location: 3 E Anderson, SC
UNK mph
Aug 21, 2018
9:35 PM UTC
Wind report for August 21, 2018
Anderson County · 65,340 Homes in County
Wind Report Description: SCHP REPORTED A TREE DOWN ON AGNEW RD.
NWS Wind Report Location: 3 NW Starr, SC
UNK mph
Aug 21, 2018
9:12 PM UTC
Wind report for August 21, 2018
Morgan County · 7,414 Homes in County
Wind Report Description: TREE DOWN ON THE 2200 BLOCK OF WINCHESTER GRADE ROAD.
NWS Wind Report Location: Berkeley Spgs, WV
59 mph
Aug 21, 2018
8:56 PM UTC
Wind report for August 21, 2018
Grand County · 3,532 Homes in County
Wind Report Description: ASOS STATION CNY... CANYONLANDS FIELD AIRPORT.
NWS Wind Report Location: Canyonlands Field Airpo, UT
UNK mph
Aug 21, 2018
8:56 PM UTC
Wind report for August 21, 2018
Morgan County · 7,414 Homes in County
Wind Report Description: TREE DOWN ON THE 500 BLOCK OF WASHINGTON STREET.
NWS Wind Report Location: Berkeley Spgs, WV
UNK mph
Aug 21, 2018
8:23 PM UTC
Wind report for August 21, 2018
Morgan County · 7,414 Homes in County
Wind Report Description: TREE DOWN ON THE 10000 BLOCK OF CACAPON ROAD.
NWS Wind Report Location: Berkeley Spgs, WV
UNK mph
Aug 21, 2018
8:19 PM UTC
Wind report for August 21, 2018
Elk County · 13,693 Homes in County
Wind Report Description: TREES REPORTED TO BE DOWN ALONG HOWARD ROAD AND KEYSTONE ROAD JUST SOUTHWEST OF BROCKPORT.
NWS Wind Report Location: Brockport, PA
UNK mph
Aug 21, 2018
8:13 PM UTC
Wind report for August 21, 2018
Jefferson County · 17,142 Homes in County
Wind Report Description: SEVERAL TREES DOWN ALONG FERMANTOWN ROAD NEAR RATTLESNAKE ROAD.
NWS Wind Report Location: 1 ENE Lanes Mills, PA
UNK mph
Aug 21, 2018
8:12 PM UTC
Wind report for August 21, 2018
St. Mary's County · 33,775 Homes in County
Wind Report Description: TREE DOWN ON QUEENTREE ROAD NEAR JESSE DRIVE.
NWS Wind Report Location: 2 W Sandgates, MD
Showing 15 of 54
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 21, 2018

3 reports
UNK category
Aug 21, 2018
8:10 PM UTC
Tornado report for August 21, 2018
Jefferson County · 17,142 Homes in County
Tornado Report Description: IN COORDINATION WITH NWS CTP... A PRELIMINARY EF1 TORNADO BEGAN SOUTH OF BROCKWAY NEAR ROUTE 219 AND HARVEYS RUN RD AND CONTINUED NORTHEASTWARD INTO ELK COUNTY PA TO SOUTHWEST OF BROCKPORT. DAMAGE DOCUMENTED THUS FAR INCLUDES SNAPPED AND UPROOTED TREES... PROJECTILE-IMPALED ROOFS... FACIAL STRUCTURAL DAMAGE AND A TOPPLED TRUCK. ADDITIONAL GROUND AND AERIAL SURVEYS WILL BE CONDUCTED BY NWS AND COUNTY EMAS DURING THE WEEK.
NWS Tornado Report Location: 3 SSE Brockway, PA
UNK category
Aug 21, 2018
11:05 AM UTC
Tornado report for August 21, 2018
Vernon County · 7,073 Homes in County
Tornado Report Description: A NWS SURVEY DETERMINED THAT AN EF-0 TORNADO STRUCK A BARN RESULTING IN DAMAGE TO THE ROOF. TIME ESTIMATED BY RADAR.
NWS Tornado Report Location: 5 WNW Jerico Springs, MO
UNK category
Aug 21, 2018
1:00 AM UTC
Tornado report for August 21, 2018
Walworth County · 37,604 Homes in County
Tornado Report Description: 70MPH WINDS.
NWS Tornado Report Location: Delavan, WI
Showing 3 of 3
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 21, 2018 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 21, 2018? 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 21, 2018?

Our records show 2 hail, 54 wind, and 3 tornado reports on August 21, 2018, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on August 21, 2018.

What was the largest hail reported on August 21, 2018?

The largest hail size in these storm-report records on August 21, 2018 is 1.00″, reported near Loma 5Nnw, CO.

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 21, 2018 — 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 21, 2018 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 21, 2018?

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 21, 2018 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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