Hail and Damaging Winds in Maryland, July 24, 2009

Name: Hail and Damaging Winds in Maryland, July 24, 2009
Start: 2009-07-24T17:02
End: 2009-07-24T18:00
Location: Maryland

July 24, 2009 · NWS LWX · 4 events in 4 counties and zones

A trough of low pressure over the region caused showers and thunderstorms to develop. There was enough cold air aloft for some thunderstorms to become severe.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 4

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LWX wrote it up.

A trough of low pressure over the region caused showers and thunderstorms to develop. There was enough cold air aloft for some thunderstorms to become severe.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Jul 24, 1:58 PM EST, 3 hours 4 minutes earlier.

Area forecast discussion, Jul 24, 1:58 PM EST, 3 hours 4 minutes before

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Hazardous weather outlook, Jul 24, 2:07 PM EST, 2 hours 55 minutes before

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In the hours before

Special weather statement, Jul 24, 1:22 PM EST, 3 hours 40 minutes before

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Special weather statement, Jul 24, 3:24 PM EST, 1 hour 38 minutes before

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Special weather statement, Jul 24, 3:52 PM EST, 1 hour 10 minutes before

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Special weather statement, Jul 24, 4:28 PM EST, 34 minutes before

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Special weather statement, Jul 24, 4:44 PM EST, 18 minutes before

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Local storm report, Jul 24, 5:01 PM EST, 1 minute before

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The radar

The Sterling radar (KLWX), 77 km away, was scanning. The volume nearest the first event began at 22:04 UTC.

Open the radar archive at this moment

Event by event

2 hail, 2 thunderstorm wind. Local standard time, as filed.

Hail, Carroll

When: July 24, 5:02 PM EST
Where: Carroll County, 0.87 mi SW of Cedarhurst
Measured: 0.75 in hail
Reported by: Public
Coordinates: 39.490, -76.890

Penny size hail was reported in Finksburg.

Thunderstorm Wind, Washington

When: July 24, 5:08 PM EST
Where: Washington County, 2.54 mi WSW of Grimes
Measured: 50 kt (58 mph) estimated gust
Reported by: Fire Department/Rescue
Coordinates: 39.510, -77.810

Trees and wires were down near Grimes.

Thunderstorm Wind, Frederick

When: July 24, 5:40 PM EST
Where: Frederick County, 0.87 mi SE of Middletown
Measured: 51 kt (59 mph) measured gust
Reported by: Mesonet
Coordinates: 39.440, -77.540

A wind gust of 59 mph was measured in Middletown.

Hail, Harford

When: July 24, 6:00 PM EST
Where: Harford County, Sewell
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 39.470, -76.250

Penny size hail was reported in Sewell.

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Maryland in 2009 Every state in 2009 This day in weather history Warnings in Maryland, July 2009

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 187319, 187317, 187318, 189008.