A corridor of moisture funnelled up the eastern seaboard. Bands of heavy rain began to rapidly move into Maryland just after midnight on Thursday morning, September 30.  After the initial low pressure passed north of the area late Thursday morning after producing up to 8 inches of rain across portions of Maryland and numerous reports of flash flooding, a brief lull in precipitation occurred Thursday afternoon, before the remnant circulation of former Tropical Storm Nicole moved up the Delmarva Peninsula, reinvigorating heavy rainfall. Storm total rainfall exceeded one foot across many areas along the shore of the Chesapeake Bay, with reported measurements of over 14 inches in several locations in St. Mary���s County, MD. Hundreds of roads were closed due to high water across the area, and high water rescues and roadway washouts were frequent.  There no reported injuries or deaths.  At Baltimore-Washington International, the rainfall amount of 6.02��� on September 30 was the 2nd highest daily total ever recorded, with only August 23, 1933 receiving a higher amount in a single calendar day. Events associated with this episode continued into October 1.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 08:00:00 to 30-SEP-10 11:15:00 (EST-5)
Location: DUNDALK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter observed 6 to 12 inches of flowing water over Merritt Blvd. A rain gage in the area measured 8.51 inches.

Flash Flood in CALVERT, MARYLAND
From 30-SEP-10 21:17:00 to 30-SEP-10 23:30:00 (EST-5)
Location: STOAKLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flash flooding was reported at Prince Frederick. A rain gage in Prince Frederick totaled 9.48 inches.

Flash Flood in HOWARD, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 17:15:00 (EST-5)
Location: HANOVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Flash Flooding was reported in the vicinity of Race Road, Furnance Road, and Park Center Drive. A rainfall report of 6.18 inches was received from the area.

Flash Flood in CALVERT, MARYLAND
From 30-SEP-10 16:00:00 to 30-SEP-10 20:15:00 (EST-5)
Location: APPEAL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Mill Bridge Road was closed due to water flowing over the bridge.  A cooperative observer measured 13.48 inches of rain in the region.

Flash Flood in FREDERICK, MARYLAND
From 30-SEP-10 21:30:00 to 30-SEP-10 23:30:00 (EST-5)
Location: FREDERICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flash flooding was reported at various locations across the county. Rain gage reports from the area included one on 4.02.

Flood in ANNE ARUNDEL, MARYLAND
From 30-SEP-10 09:30:00 to 30-SEP-10 15:30:00 (EST-5)
Location: ARNOLD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One foot of standing water was observed on southbound Maryland Route 2 at the junction with Route 50 and Route 450. A rainfall report of 10.49 was also received from the area.

Flash Flood in MONTGOMERY, MARYLAND
From 30-SEP-10 10:00:00 to 30-SEP-10 14:15:00 (EST-5)
Location: TAKOMA PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flash flooding was reported along Sligo Creek Parkway.  A rainfall report from the area was received of 5.57 inches.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 21:59:00 to 30-SEP-10 23:15:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

West Patapsco Road was closed due to flash flooding. Rain gages in the area measured as much as 8.06.

Flash Flood in HOWARD, MARYLAND
From 30-SEP-10 22:15:00 to 30-SEP-10 23:15:00 (EST-5)
Location: DORSEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Meadowridge Drive was closed. A rainfall report of 4.70 was observed near the area.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 12:30:00 to 30-SEP-10 16:15:00 (EST-5)
Location: POPLAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter observed 10300 block of Route 40 closed due to flash flooding.  Rain gage in the area measured 9.52 inches of rain.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 12:30:00 to 30-SEP-10 16:15:00 (EST-5)
Location: POPLAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Route 7 was closed just west of Campbell Blvd.  A rain gage in the region measured 10.17 of rain.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 30-SEP-10 23:00:00 to 30-SEP-10 23:59:00 (EST-5)
Location: GREEN HAVEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous basements were flooded in the area. A rainfall total from the area was reported at 9.90 inches.

Flash Flood in FREDERICK, MARYLAND
From 30-SEP-10 12:45:00 to 30-SEP-10 15:15:00 (EST-5)
Location: SAMS CREEK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Maryland Route 31 was closed at the bridge over Sams Creek, which was overflowing its banks. A rain gage in the area observed 4.60 inches of rain.

Flash Flood in FREDERICK, MARYLAND
From 30-SEP-10 12:45:00 to 30-SEP-10 16:15:00 (EST-5)
Location: UTICA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Intersection of Bottomly Road and Wilhide Road was closed due to flash flooding.  A rain gage in the area measured 4.34 inches.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: ST INIGOES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Route 5 was closed at Villa Road. A rain gage in the area observed 14.07 inches.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: PARK HALL ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Route 5 was closed at Willows Road. A rainfall report of 13.80 was received from the area.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Flat Iron Road was closed. An AWOS site measured 13.01 of storm total rainfall.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Route 5 was closed in Great Mills.  A rain gage in the area measured 12.97 inches.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 04:22:00 to 30-SEP-10 09:15:00 (EST-5)
Location: BEAUVUE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Water was reported over Route 244. At the time of the report, rain gages in the area had measured up to 7 of rainfall.

Flash Flood in CALVERT, MARYLAND
From 30-SEP-10 04:31:00 to 30-SEP-10 12:30:00 (EST-5)
Location: NORTH BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several roads were flooding in North Beach.  At the time of the report, a rain gage measured 6.30 near the event.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 17:00:00 to 30-SEP-10 18:15:00 (EST-5)
Location: ESSEX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Mace Avenue was closed due to flash flooding at the Southeast Freeway. A mesonet site in the area observed 8.60 inches of rain.

Flash Flood in MONTGOMERY, MARYLAND
From 30-SEP-10 06:14:00 to 30-SEP-10 09:15:00 (EST-5)
Location: FRIENDSHIP HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Southbound lanes of Wisconsin Avenue were closed.  A rain gage near the area measured 3.72 inches.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Indian Bridge Road was closed.  An AWOS site in the area observed a storm total of 12.87 inches.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 17:00:00 to 30-SEP-10 18:15:00 (EST-5)
Location: STEMMERS RUN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

The intersection of Glider Drive and Rossville Blvd. was closed.  A rain gage in the area measured 7.90 inches of rainfall.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 05:00:00 to 30-SEP-10 06:00:00 (EST-5)
Location: DUNDALK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

North Point Road was closed between German Hill Road and Willow Road. A mesonet site measured 8.47 inches of rain near the event.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 06:20:00 to 30-SEP-10 09:15:00 (EST-5)
Location: REDGATE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Medley's Neck Road was closed due to flooding. A rainfall report of 10.64 inches was received near the area.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 30-SEP-10 18:56:00 to 30-SEP-10 21:15:00 (EST-5)
Location: RIVERA BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Geneva Road was closed at Fort Smallwood Road. A rain gage in the area measured 11.52 inches of rain.

Flash Flood in ST. MARY'S, MARYLAND
From 30-SEP-10 15:00:00 to 30-SEP-10 15:30:00 (EST-5)
Location: REDGATE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Intersection of Route 5 and Route 244 closed.  An observer in the area reported 12.21 inches of rain.

Flash Flood in BALTIMORE, MARYLAND
From 30-SEP-10 17:00:00 to 30-SEP-10 18:15:00 (EST-5)
Location: STEMMERS RUN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Orems Road was closed at Sunnyside Lane.  Rainfall reported in the region included a 7.68 total near the event.

Flash Flood in MONTGOMERY, MARYLAND
From 30-SEP-10 19:00:00 to 30-SEP-10 22:15:00 (EST-5)
Location: GEORGETOWN JCT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Rock Creek was out of its banks and flooding portions of Beach Drive. A rainfall report was received from the area of 5.43.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 30-SEP-10 06:30:00 to 30-SEP-10 09:15:00 (EST-5)
Location: LUSBY XRDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Route 450 was closed due to high water at Huntwood Drive.  A rain gage in the area measured 9.79 inches.