Heads up! Small hail spotted in these regions: McAllen, TX • Laredo, TX • Columbia, SC • Casper, WY • Roswell, NM ATTENTION! Damaging hail detected. Hail tracking is now active for these regions: Wilmington, NC • Idaho Falls, ID • Asheville, NC • Kingsport, TN • Johnson City, TN • Grand Junction, CO • Fayetteville, NC • Raleigh, NC • Saint Louis, MO • Champaign, IL • Mattoon, IL • North Port, FL • Fort Myers, FL • Tampa, FL • Charlotte, NC • Owensboro, KY • Knoxville, TN • Evansville, IN • Farmington, NM • Louisville, KY • Provo, UT • Ogden, UT • Salt Lake City, UT Heads up! Small hail spotted in these regions: McAllen, TX • Laredo, TX • Columbia, SC • Casper, WY • Roswell, NM ATTENTION! Damaging hail detected. Hail tracking is now active for these regions: Wilmington, NC • Idaho Falls, ID • Asheville, NC • Kingsport, TN • Johnson City, TN • Grand Junction, CO • Fayetteville, NC • Raleigh, NC • Saint Louis, MO • Champaign, IL • Mattoon, IL • North Port, FL • Fort Myers, FL • Tampa, FL • Charlotte, NC • Owensboro, KY • Knoxville, TN • Evansville, IN • Farmington, NM • Louisville, KY • Provo, UT • Ogden, UT • Salt Lake City, UT

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

Hail, Wind & Tornado Reports in and near ZIP 20817

Public hail, wind, and tornado reports in and near ZIP 20817 from November 16, 2006 through September 4, 2026, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Example: 20817 — search hail, wind and tornado public reports for any U.S. ZIP code

Hail Reports

Wind Reports

Tornado Reports

Max Hail Size

1.00″

Source NOAA SPC · NWS Local Storm Reports Coverage ZIP 20817 · 2006–present Updated Daily · last Sep 4, 2026

Latest NWS Hail Reports in and near ZIP 20817

2 reports

Free hail report for your home →

1.00″ hail

Apr 21, 2009
5:16 PM EST-5

Hail report for ZIP 20817

Montgomery County · 189,730 Homes in County

Hail Report Description: Quarter sized hail was reported near Carderock Springs.

NWS Hail Report Location: 1.07 E Carderock Spgs, MD

0.75″ hail

Aug 7, 2008
12:26 PM EST-5

Hail report for ZIP 20817

Montgomery County · 189,730 Homes in County

Hail Report Description: Penny size hail was reported about 2 miles northwest of Bethesda.

NWS Hail Report Location: .88 NW Woodhaven, MD

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.

Latest NWS Wind Reports in and near ZIP 20817

60 reports

Free hail report + wind check →

UNK mph

Sep 4, 2026
3:38 AM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees down on MD-191 Bradley Blvd at Oak Forest Ln

NWS Wind Report Location: 2 Ene Congressional Man, MD

UNK mph

Sep 2, 2026
5:37 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Tree down on westbound MD-188 Wilson Ln prior to Springer Rd

NWS Wind Report Location: 1 Wsw Bethesda, MD

UNK mph

Sep 2, 2026
5:37 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Tree down on MD-190 River Rd at MD-188 Wilson Ln

NWS Wind Report Location: 1 Wsw Bethesda, MD

UNK mph

Jul 1, 2025
7:08 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Tree damage was reported in Bethesda... including a tree that brought down wires and damaged a pole in the 9900 block of De Paul Drive.

NWS Wind Report Location: 2 NNW Bethesda, MD

UNK mph

Jul 1, 2025
6:59 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees and large branches blew down on southbound I-495 Capital Beltway Outer Loop at Exit 39/MD-190 River Road.

NWS Wind Report Location: 1 ESE Congressional Man, MD

UNK mph

Jun 19, 2025
8:20 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees and wires down

NWS Wind Report Location: Congressional Manor, MD

UNK mph

May 31, 2025
6:37 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees blew down on westbound MD-190 River Road blocking all lanes between Wilson Lane and Nevis Road/Beech Tree Road.

NWS Wind Report Location: 1 WSW Bethesda, MD

UNK mph

Sep 13, 2023
2:33 AM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees blew down on MD-193 River Road near Whittier Boulevard/Winston Drive.

NWS Wind Report Location: 1 NE Glen Echo, MD

61 mph

Jul 29, 2023
8:30 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: A wind gust of 53 knots (61 MPH) was measured by a mesonet in Cabin John (FW3819).

NWS Wind Report Location: 1 NW Glen Echo, MD

UNK mph

Jul 29, 2023
8:26 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees blew down on eastbound MD-190 River Road at Whittier Boulevard.

NWS Wind Report Location: 1 NE Glen Echo, MD

UNK mph

Jul 14, 2023
10:06 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: Trees and powerlines down onto transformer near the 6700 block of Democracy Blvd.

NWS Wind Report Location: 2 NNW Bethesda, MD

UNK mph

Jun 2, 2022
8:17 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: POWERLINE WIRES DOWN ON THE 7000 BLOCK OF WILSON LANE

NWS Wind Report Location: 1 N Glen Echo, MD

UNK mph

Aug 11, 2021
9:00 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: WIRES DOWN ACROSS THE ROAD ON THE 10100 BLOCK OF ASHBURTON LANE

NWS Wind Report Location: 2 WSW Garrett Park, MD

UNK mph

Aug 11, 2021
8:55 PM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: TREE DOWN ONTO A HOUSE ON THE 10200 BLOCK OF FARNHAM DRIVE

NWS Wind Report Location: 2 WSW Garrett Park, MD

UNK mph

Jul 29, 2021
1:58 AM UTC

Wind report for ZIP 20817

Montgomery County · 189,730 Homes in County

Wind Report Description: BRANCHES DOWN ON WIRES ON SAVANNAH COURT.

NWS Wind Report Location: 2 NNE Congressional Man, MD

Showing 15 of 60

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 20817

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 in and near ZIP 20817 on the Interactive Map

Report type

Hail

Wind

Tornado

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NWS Storm Reports & Census Data

U.S. Census Data · ZIP Code

ZIP 20817 area census snapshot

People & households

Population37,738

Households13,584

Housing units14,363

Income

Median household income$240,104

$100k+ households25.9%

$150k+ households14.6%

Housing stock

Single-family detached11,179

Attached single-family994

Small multifamily232

Large multifamily1,848

Mobile homes110

Housing mix

Single-family share77.8%

Attached-home share6.9%

Multifamily share14.5%

Mobile-home share0.8%

Ownership & occupancy

Owner-occupied11,186

Renter-occupied2,398

Vacant units779

Home value & age

Median home value$1,142,300

Owner homes $300k+94.4%

Owner homes $500k+90.0%

Owner homes $750k+84.6%

Median year built1968

Older-home share65.8%

Vehicle context

Households with cars12,992

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 20817 have on record?

Our records show 2 hail, 60 wind, and 0 tornado reports in and near ZIP 20817, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on September 4, 2026.

What is the largest hail ever reported in ZIP 20817?

The largest hail size in these storm-report records in and near ZIP 20817 is 1.00″. It was reported near Carderock Spgs, MD on April 21, 2009.

A storm report showed up near my home in ZIP 20817 — 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 20817 and ask about a Remote Hail Inspection before anyone climbs on the roof.

I am buying a home in ZIP 20817 — 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 20817 address before closing helps you ask informed questions about roof age, past repairs, and any prior claims.

I am selling a home in ZIP 20817 — 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 20817 address?

Use the address search to pull a free address-level hail report for any property in ZIP 20817 — 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 20817, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported in ZIP 20817, 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.

Hail, Wind & Tornado Reports in and near ZIP 20817

Latest NWS Hail Reports in and near ZIP 20817

Latest NWS Wind Reports in and near ZIP 20817

Latest NWS Tornado Reports in and near ZIP 20817

NWS Hail, Wind and Tornado Reports in and near ZIP 20817 on the Interactive Map

Get a free hail report for your address

NWS Storm Reports & Census Data

ZIP 20817 area census snapshot

Frequently asked questions

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