UPDATE: Loudoun County Under New Flash Flood Warning, Until 6:30 PM

UPDATE: The National Weather Service has issued a new Flash Flood Warning for Loudoun County that continues until 6:30 p.m. Thursday.
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Here's more from the National Weather Service on this most recent warning:

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHWESTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND... CENTRAL LOUDOUN COUNTY IN NORTHERN VIRGINIA... * UNTIL 630 PM EDT *

AT 318 PM EDT

...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING. RADAR ESTIMATES THAT UP TO 1 INCH OF RAIN HAVE ALREADY FALLEN ACROSS PORTIONS OF THE WARNED AREA. ADDITIONAL RAINFALL AMOUNTS OF UP TO 2 INCHES CAN BE EXPECTED.

 * SOME LOCATIONS THAT ARE AFFECTED BY THE HEAVY RAIN INCLUDE LEESBURG...BRUNSWICK AND POINT OF ROCKS. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES... CATOCTIN CREEK...BROAD RUN...POTOMAC RIVER...DUTCHMAN CREEK...SOUTH FORK CATOCTIN CREEK...GOOSE CREEK...NORTH FORK GOOSE CREEK... BEAVERDAM CREEK...SOUTH FORK SYCOLIN CREEK...BIG BRANCH...SYCOLIN CREEK...QUARTER BRANCH...TUSCARORA CREEK...CROOKED RUN...LIMESTONE BRANCH AND NORTH FORK CATOCTIN CREEK.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. FLOODWATER USUALLY IS DEEPER THAN IT APPEARS. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE WHEN FLOODED ROADS ARE ENCOUNTERED...TURN AROUND...DONT DROWN.

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The National Weather Service in Sterling has extended the Flood Warning for small streams in Loudoun County until 10:45 a.m. A Flash Flood Watch is in effect until midnight.

Here's more from the NWS:

CALLS TO OFFICIALS INDICATE THAT SEVERAL ROADS REMAIN CLOSED DUE TO HIGH WATER. WATER LEVELS ARE EXPECTED TO SUBSIDE GRADUALLY INTO THE PREDAWN HOURS...THOUGH FLOOD PRONE AREAS CONTINUE TO BE AFFECTED IN WESTERN PORTIONS OF LOUDOUN AND FREDERICK COUNTIES. PRECAUTIONARY/PREPAREDNESS ACTIONS...

 A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED. STREAM RISES WILL BE SLOW. HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS IMMEDIATELY.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...CATOCTIN CREEK...LITTLE CATOCTIN CREEK...BROAD RUN...POTOMAC RIVER...GOOSE CREEK...BEAVERDAM CREEK...LITTLE RIVER...BIG BRANCH...LENAH RUN...SYCOLIN CREEK...BUTCHERS BRANCH...DOG BRANCH...BALLENGER CREEK...TUSCARORA CREEK...CARROLL CREEK...FISHING CREEK...WEST BRANCH MIDDLE CREEK...PINEY RUN AND LITTLE TUSCARORA CREEK. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE ELEVATED LEVELS ON SMALL CREEKS AND STREAMS...AND PONDING OF WATER ON COUNTRY ROADS AND FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

 IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.