A hot and humid air mass developed over the Mid Atlantic ahead of a strong cold front on August 25th. Temperatures climbed into the mid 90s by noon. These temperatures combined with high humidity created heat index values around 105. Showers and thunderstorms developed during the late afternoon as the cold front approached the region. Some of these storms became severe, producing large hail and damaging winds that downed trees and power lines.

Heat in NORTHERN BALTIMORE, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Heat in SOUTHERN BALTIMORE, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Heat in CARROLL, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Heat in FREDERICK, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 25-AUG-07 17:00:00 to 25-AUG-07 17:00:00 (EST-5)
Location: DAMASCUS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A Cooperative Observer reported a tree measuring two feet in diameter  down in Damascus, MD.

Thunderstorm Wind in CARROLL, MARYLAND
From 25-AUG-07 17:15:00 to 25-AUG-07 17:25:00 (EST-5)
Location: MT AIRY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Carroll County Emergency Management reported trees down throughout the county, including between Mount Airy and Winfield.

Thunderstorm Wind in HOWARD, MARYLAND
From 25-AUG-07 17:49:00 to 25-AUG-07 17:55:00 (EST-5)
Location: SAVAGE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Management reports tress down across the county.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 25-AUG-07 18:25:00 to 25-AUG-07 18:30:00 (EST-5)
Location: REISTERSTOWN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Baltimore County Emergency Management reported power lines down in Reisterstown, MD.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 25-AUG-07 19:37:00 to 25-AUG-07 19:40:00 (EST-5)
Location: PASADENA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A Trained Spotter reported wind damage near Edwin Raynor Road and Mountain Road in Pasadena, MD.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 25-AUG-07 18:35:00 to 25-AUG-07 18:35:00 (EST-5)
Location: BALTIMORE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Baltimore Emergency Management reported trees down in the City of Baltimore.

Lightning in WASHINGTON, MARYLAND
From 25-AUG-07 16:38:00 to 25-AUG-07 16:38:00 (EST-5)
Location: WEVERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Washington County Emergency Management and local newspapers reported that a woman was injured when struck by lightning while tubing on the C&O Canal in southern Washington County. A 27 year old woman was struck by lightning while in the water near the intersection of Keep Tryst Road at Weverton Road.

Heat in HOWARD, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Heat in MONTGOMERY, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Heat in PRINCE GEORGES, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.

Thunderstorm Wind in FREDERICK, MARYLAND
From 25-AUG-07 16:18:00 to 25-AUG-07 16:20:00 (EST-5)
Location: BRUNSWICK
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Frederick County Emergency Management reported trees down in Brunswick. Local newspapers reported numerous trees down, including trees down on fences, power lines and even on vehicles. Nearly 3,000 households were left without power.

Hail in WASHINGTON, MARYLAND
From 25-AUG-07 16:32:00 to 25-AUG-07 16:32:00 (EST-5)
Location: SMITHSBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A Trained Spotter reported penny size hail at the intersection of Routes 77 and 64 near Smithsburg, MD.

Heat in ANNE ARUNDEL, MARYLAND
From 25-AUG-07 11:00:00 to 25-AUG-07 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Automated Surface Observations reported high temperatures and relative humidities that produced heat index values of 105 and above.