During the morning of the 23rd heavy rain fell on top of already saturated ground from Hurricane Isabel which struck a few days before.  This lead to widespread flooding of roads,  waterways, and other low lying areas.  In Washington County, rainfall totals included 2.65 inches in Knoxville and 2.19 inches in Sharpsburg.  In Frederick County, nearly 60 roads were closed by flooding and 37 people had to be rescued from their water-stranded cars.  Carroll Creek overflowed into homes along Thomas Avenue and into Baker Park in Frederick.  The Moncacy River which rose over 4 feet above flood stage in Frederick flooded Buckeystown Community Park. Bennett's Creek flooded cars on Route 355 up to their windshields and two men were rescued from the roofs of their vehicles. One man was rescued from his car after being caught in floodwaters on Gas House Pike. Another person was rescued from the roof of his car on South Ren Road.  Water rescues were also reported on Big Woods Road, Crum Road, Coppermine Road, Biggs Ford Road, and Cap Stine Road.  Lake Linganore Dam Spillway overflowed onto Boyers Mill Road. Countless other roads along creeks and streams were also flooded. Mudslides were reported on  routes 464, 75, 85, 28, and 355. A 120-foot long and 40-foot deep sinkhole formed along Route 70 near the intersection of Reich's Ford Road, shutting down the interstate for hours. A second 15-foot deep sinkhole opened up near the Frederick fairgrounds.  Rainfall totals included an incredible 5.12 inches in Frederick and 2.30 inches in Thurmont.  In Carroll County, 2.86 inches of rain was reported in Westminster.  Numerous streets and basements were flooded across the county.  Sams Creek overflowed its banks onto Sams Creek Road.  In Baltimore County, 2.52 inches of rain fell in the city of Baltimore.  The entrance ramps to Interstate 83 and the Jones Falls Expressway were closed temporarily due to high water.  In Harford County, 2.69 inches of rain fell in Street and 2.62 inches fell in Fallston.  Broad Creek at Old Pylesville Road reached bankful. A thunderstorm that moved through Forest Hills produced wind gusts that damaged a deck and downed numerous trees on Walters Mill Road.  In Howard County, rainfall totals included 2.50 inches in Hipsley Mill, 2.30 inches in Cooksville, and 2.21 inches in North Laurel.  Hammond Branch in North Laurel overflowed onto Stephens Road.   In Montgomery County, rainfall totals included 4.46 inches near Poolesville, 3.08 inches in Damascus, 3.01 inches in Forest Glen, 2.87 inches in Germantown, 2.40 inches in Gaithersburg, and 2.28 inches in Chevy Chase.  Several road closures and water rescues were reported in and around Poolesville and Dickerson.  Roads were also flooded in Bethesda and Chevy Chase. Seneca Creek rose nearly 3 feet above flood stage in Dawsonville.  In Anne Arundel County, 2.38 inches of rain was recorded at Baltimore-Washington International Airport and 2.10 inches was reported in Annapolis. Dozens of roads in the northern and western portion of the county were closed by flooding including Dorsey Road, Baldwin Avenue, Furnace Branch Road, Hammonds Ferry Road, Lee Drive, and Race Road. Numerous roads were flooded in spots including Route 2, Baltimore/Washington Parkway, Patuxent River Road, Whiskey Bottom Road, and Defense Highway. Two motorists had to be rescued from their cars after being stuck in floodwaters.  In Prince George's County, rainfall totals included 2.78 inches in Laurel, 2.54 inches in Greenbelt, 2.26 inches in Oxon Hill, and 2.13 inches in Bowie.  Route 1 was closed by flooding at the intersection of Ammendale Road.  Flooding also closed Route 50 at Kenilworth Avenue.  The Beltway was flooded in spots near Route 202.

Heavy Rain in BALTIMORE CITY (C), MARYLAND
From 23-SEP-03 03:00:00 to 23-SEP-03 06:00:00 (EST)
Location: COUNTYWIDE
Reported by: AWOS,ASOS,MESONET,ETC

Heavy Rain in HARFORD, MARYLAND
From 23-SEP-03 03:00:00 to 23-SEP-03 06:00:00 (EST)
Location: COUNTYWIDE
Reported by: AWOS,ASOS,MESONET,ETC

Heavy Rain in PRINCE GEORGE'S, MARYLAND
From 23-SEP-03 04:00:00 to 23-SEP-03 07:00:00 (EST)
Location: COUNTYWIDE
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in HARFORD, MARYLAND
From 23-SEP-03 15:45:00 to 23-SEP-03 15:45:00 (EST)
Location: FOREST HILL
Magnitude: 50 EG
Property damage: 2.5K
Reported by: FIRE DEPT/RESCUE SQUAD

Numerous trees and a deck were damaged.

Flash Flood in HOWARD, MARYLAND
From 23-SEP-03 06:00:00 to 23-SEP-03 08:00:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

Small streams and roads were flooded.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 23-SEP-03 05:00:00 to 23-SEP-03 10:00:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

Several roads were flooded.

Flash Flood in CARROLL, MARYLAND
From 23-SEP-03 04:15:00 to 23-SEP-03 07:15:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Numerous roads were flooded.

Flood in CARROLL, MARYLAND
From 23-SEP-03 07:15:00 to 23-SEP-03 16:10:00 (EST)
Reported by: FIRE DEPT/RESCUE SQUAD

Roads continued to be flooded.

Flash Flood in MONTGOMERY, MARYLAND
From 23-SEP-03 02:00:00 to 23-SEP-03 04:45:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Roads and low lying areas were flooded.

Flood in FREDERICK, MARYLAND
From 23-SEP-03 06:45:00 to 24-SEP-03 12:30:00 (EST)
Reported by: AWOS,ASOS,MESONET,ETC

The Monocacy River rose over 4 feet above flood stage.

Flood in MONTGOMERY, MARYLAND
From 23-SEP-03 04:00:00 to 23-SEP-03 21:00:00 (EST)
Reported by: AWOS,ASOS,MESONET,ETC

Seneca Creek rose about 3 feet above flood stage.

Flood in FREDERICK, MARYLAND
From 23-SEP-03 06:30:00 to 23-SEP-03 13:00:00 (EST)
Reported by: FIRE DEPT/RESCUE SQUAD

Roads continued to be flooded.

Flood in MONTGOMERY, MARYLAND
From 23-SEP-03 04:45:00 to 23-SEP-03 16:40:00 (EST)
Reported by: FIRE DEPT/RESCUE SQUAD

Roads continued to be flooded.

Heavy Rain in WASHINGTON, MARYLAND
From 23-SEP-03 03:00:00 to 23-SEP-03 06:00:00 (EST)
Location: EAST PORTION
Reported by: AWOS,ASOS,MESONET,ETC

Flash Flood in FREDERICK, MARYLAND
From 23-SEP-03 01:00:00 to 23-SEP-03 06:30:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Numerous roads closed by flooding.