An approaching cold front combined with a very hot and humid airmass to generate severe thunderstorms around much of the Mid Atlantic on July 18. Reports of severe weather were received from the Eastern Panhandle of West Virginia, through the Washington/Baltimore corridor, to the Chesapeake Bay. The most intense of the severe storms occurred in Eastern Panhandle of West Virginia, where the worst damages occurred, and a report of tennis-ball sized hall was also reported. Extensive damages also occurred in the Frederick and Hagerstown areas of Central Maryland due to the severe thunderstorms.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 18-JUL-06 15:30:00 to 18-JUL-06 15:30:00 (EST)
Location: LANDOVER
Magnitude: 50 EG
Property damage: 12K
Reported by: FIRE DEPT/RESCUE SQUAD

Powerlines downed.

Thunderstorm Wind in ALLEGANY, MARYLAND
From 18-JUL-06 15:31:00 to 18-JUL-06 15:31:00 (EST)
Location: PINEY GROVE
Magnitude: 50 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Trees down along Interstate 68 near Orleans Road. The downed trees blocked the interstate temporarily.

Hail in PRINCE GEORGE'S, MARYLAND
From 18-JUL-06 15:42:00 to 18-JUL-06 15:42:00 (EST)
Location: PALMER PARK
Magnitude: 1.00 
Reported by: BROADCAST MEDIA

Quarter sized hail reported by the local media.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 18-JUL-06 15:55:00 to 18-JUL-06 15:55:00 (EST)
Location: RIVERDALE
Magnitude: 52 EG
Property damage: 25K
Reported by: EMERGENCY MANAGER

Telephone poles and wires downed.

Hail in FREDERICK, MARYLAND
From 18-JUL-06 18:20:00 to 18-JUL-06 18:20:00 (EST)
Location: ADAMSTOWN
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Nickel sized hail.

Thunderstorm Wind in CARROLL, MARYLAND
From 18-JUL-06 18:26:00 to 18-JUL-06 18:26:00 (EST)
Location: NEW WINDSOR
Magnitude: 50 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Powerlines downed.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 18-JUL-06 16:50:00 to 18-JUL-06 16:50:00 (EST)
Location: HAGERSTOWN ARPT
Magnitude: 50 MG
Reported by: AWOS,ASOS,MESONET,ETC

Measured wind gust at the Hagerstown Regional Airport.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 18-JUL-06 16:57:00 to 18-JUL-06 17:00:00 (EST)
Location: MAUGANSVILLE
Magnitude: 50 EG
Property damage: 20K
Reported by: EMERGENCY MANAGER

Trees and powerlines downed. Some tree damage also near Long Meadow.

Thunderstorm Wind in FREDERICK, MARYLAND
From 18-JUL-06 17:50:00 to 18-JUL-06 17:50:00 (EST)
Location: MIDDLEPOINT
Magnitude: 50 EG
Property damage: 13K
Reported by: LAW ENFORCEMENT

Trees and powerlines downed.

Hail in FREDERICK, MARYLAND
From 18-JUL-06 18:10:00 to 18-JUL-06 18:10:00 (EST)
Location: BRADDOCK HGTS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Penny sized hail.

Thunderstorm Wind in HARFORD, MARYLAND
From 18-JUL-06 19:02:00 to 18-JUL-06 19:02:00 (EST)
Location: BEL AIR
Magnitude: 50 EG
Property damage: 18K
Reported by: LAW ENFORCEMENT

Trees and powerlines downed.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 18-JUL-06 19:35:00 to 18-JUL-06 19:35:00 (EST)
Location: BOWIE
Magnitude: 50 EG
Property damage: 8K
Reported by: TRAINED SPOTTER

Powerlines downed.

Thunderstorm Wind in HARFORD, MARYLAND
From 18-JUL-06 18:40:00 to 18-JUL-06 18:40:00 (EST)
Location: JARRETTSVILLE
Magnitude: 50 EG
Property damage: 10K
Reported by: EMERGENCY MANAGER

Powerlines downed.

Hail in CARROLL, MARYLAND
From 18-JUL-06 19:00:00 to 18-JUL-06 19:00:00 (EST)
Location: MT AIRY
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Penny sized hail.