Flash Flood Warning 36, NWS Baltimore/Washington

Issued

Aug 4, 2001, 1:00 AM EDT (05:00 UTC)

Expired

Aug 4, 2001, 4:00 AM EDT

In force

3 hr

Issued by

NWS Baltimore/Washington

Area

Whole counties

Counties Page County, VA, Warren County, VA

The Sterling radar (KLWX), 78 km from the middle of the area, began a volume at 05:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

000 
WGUS51 KLWX 040502
FFWLWX

VAC139-187-040800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
100 AM EDT SAT AUG 4 2001

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  PAGE COUNTY IN NORTHWEST VIRGINIA
  WARREN COUNTY IN NORTHWEST VIRGINIA

* UNTIL 400 AM EDT

* AT 1252 AM EDT...WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF 
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL FROM 8 MILES    
  WEST OF LURAY TO 7 MILES EAST OF FRONT ROYAL...MOVING SOUTHEAST AT 
  5 MPH.

TORRENTIAL RAINFALL IN THE WARNED AREA WILL CAUSE FLASH FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. QUICKLY
MOVE OUT OF AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

IF WATER IS FLOWING ACROSS A ROADWAY TURN YOUR VEHICLE AROUND AND
FIND AN ALTERNATE ROUTE. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW
YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSSt
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

NWS Baltimore/Washington wrote its last area forecast discussion before this flash flood warning went out at Aug 3, 9:35 PM EDT, 3 hours 25 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
935 PM EDT FRI AUG 3 2001

AT 01Z...SHOWERS LINGER OVER POTOMAC HIGHLANDS /NW CWA/. PRECIP HAS
REMAINED FAIRLY STATIONARY OVER THIS AREA SINCE THIS AFT...ONLY
MOVING ABOUT A COUNTY EASTWARD SINCE 4 PM. THE ACTIVITY PRODUCED
VERY HEAVY DOWNPOURS AND FREQUENT LIGHTING EARLY THIS EVE BUT HAS
WEAKENED CONSIDERABLY PAST FEW HRS. BOTH OBSERVATIONS LEAD TO
CONCLUSION THAT PRECIP WAS...IN ADDITION TO BEING CREATED BY LIFT
FROM VORT MAX...HELPED BY DIURNAL AND OROGRAPHIC EFFECTS.

THEREFORE...WITH LOSS OF HEATING AND UPSLOPE FLOW THIS EVENING ONLY
LIGHT TO MODERATE SHOWERS EXPECTED TO SURVIVE. IR SAT SHOWS ENERGY
ALONG FRONT SPLITTING IN TWO WITH BREAKPOINT OVER W CWA. 18Z ETA
SHOWED STRONGER DYNAMICS HOLDING TOGETHER AND PASSING THROUGH ENTIRE
CWA TONIGHT...BUT DO NOT FAVOR THAT INTERPRETATION BASED ON CURRENT
IR SAT AND RADAR TREND. 12Z ETA/AVN FCST MOST LIFT/DYNAMICS PASSING
N OF MASON-DIXON LINE WITH A BIT SKIRTING N 1/3 CWA OVERNIGHT. WILL
KEEP CHANCE POPS N 1/2 CWA AND DUE TO TOPOGRAPHY KEEP PRECIP FROM
BLUE RIDGE W SW CWA. DRY FCST REMAINS OVER FAR SE CWA BECAUSE ENERGY
SHUD STAY N OF THIS AREA OVERNIGHT.

REGARDING TEMPS...FINE TUNED LOWS BASED ON CURRENT DEW PTS. ALSO...
TOOK OUT MENTION OF PATCHY FOG IN E CWA DUE TO THICK CLOUD COVER
MOVING IN.  LEFT FOG IN W ZONES WHERE PRECIP FELL TODAY.

THANKS FOR COORD AKQ.

.LWX...NONE.

MMARGRAF

In the hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
739 PM EDT FRI AUG 3 2001

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0446 PM    NATIONAL                  MD   FLASH FLOODS
08/03/01   ALLEGANY                       ROADS FLOODED AND DAMAGE
                                          TO SOME PROPERTIES BETWEEN
                                          SHAFT AJND MIDLAND. WORST
                                          HIT AREA WAS NATIONAL.
                                          REPORTED BY LAW ENFORCEMENT

MKM

Flash Flood Warnings in Virginia, 2001Every flash flood warning in 2001

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.