Moisture streaming northeastward from an upper low over the Deep South with additional moisture from Tropical Storm Danny off the North Carolina coast pooled up against a stationary boundary near the Mason-Dixon Line. Several Rounds of heavy rain-producing showers and thunderstorms pushed eastward along this boundary from the early morning hours through the evening of the 28th. This produced flash flooding over northeast Maryland. Numerous reports of rainfall totals of 3 to 5 inches, with isolated reports of over 7 inches in southeastern Harford and north central Carroll counties.

Flash Flood in HARFORD, MARYLAND
From 28-AUG-09 01:15:00 to 28-AUG-09 04:30:00 (EST-5)
Location: ABINGDON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 7 near Abingdon Road closed due to high water.

Flash Flood in HARFORD, MARYLAND
From 28-AUG-09 00:45:00 to 28-AUG-09 04:30:00 (EST-5)
Location: BELCAMP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was flowing over the roadway at the intersection of U.S. Hwy. 40 and Route 543.

Flash Flood in CARROLL, MARYLAND
From 28-AUG-09 21:05:00 to 28-AUG-09 23:30:00 (EST-5)
Location: GUNPOWDER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water up to 40 inches high on Black Rock Road.

Flash Flood in CARROLL, MARYLAND
From 28-AUG-09 21:20:00 to 28-AUG-09 23:30:00 (EST-5)
Location: GUNPOWDER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Swiftwater rescue performed at Alesia Lineboro Road and York Road Number 1.

Flash Flood in BALTIMORE, MARYLAND
From 28-AUG-09 00:05:00 to 28-AUG-09 01:30:00 (EST-5)
Location: ST GEORGES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding reported at Timber Grove Road near Owings Mills Blvd. Spotter reported 2.71 inches of rain near the event.

Flash Flood in BALTIMORE, MARYLAND
From 28-AUG-09 00:05:00 to 28-AUG-09 01:30:00 (EST-5)
Location: DELIGHT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A vehicle was stranded in 4 feet of water on Franklin Road near Reisterstown Road.

Flash Flood in HARFORD, MARYLAND
From 28-AUG-09 00:35:00 to 28-AUG-09 04:30:00 (EST-5)
Location: STEPNEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 159 near Cranberry Road closed due to swift water over the roadway.

Flash Flood in HARFORD, MARYLAND
From 28-AUG-09 00:30:00 to 28-AUG-09 04:30:00 (EST-5)
Location: ABERDEEN ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Three people rescued and two cars pulled from flood waters flowing over the intersection of U.S. Hwy. 40 and Route 7. Rainfall total of 7.25 inches reported on Aberdeen Proving Ground.

Flash Flood in CARROLL, MARYLAND
From 27-AUG-09 23:45:00 to 28-AUG-09 00:45:00 (EST-5)
Location: BARRETT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding reported on White Rock Road as well as report of flooded basement. Piney Run IFLOWS gauge measured 2.72 inches of rainfall.

Flash Flood in CARROLL, MARYLAND
From 28-AUG-09 20:40:00 to 28-AUG-09 23:30:00 (EST-5)
Location: GUNPOWDER
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: COOP Observer

Gunpowder River out of it banks onto Grave Run Road around River Road Ranch. River Road Ranch inundated, with damage to buildings. Vehicles washed into and down the river from flash flooding. Spotter reported rainfall total of 6.46.