A thunderstorm with heavy rainfall flooded roads in Hampshire County during the afternoon of the 11th. Route 50 was closed by flood waters at the intersection of Route 259.
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The episode as NWS LWX wrote it up.
A thunderstorm with heavy rainfall flooded roads in Hampshire County during the afternoon of the 11th. Route 50 was closed by flood waters at the intersection of Route 259.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Aug 11, 1:05 PM EST, 4 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 205 PM EDT SAT AUG 11 2001 WESTERLIES REMAIN JUST N OF THE AREA OVR THE NEXT 24 HOURS. BY SUN AND MON...UPR LVL RDG DEVELOPS OVR THE WRN U.S. WITH A DOWNSTREAM TROF DEVELOPING OVR THE ERN U.S. FNT REMAINS STALLED JUST TO OUR N SEPARATING THE COOL DRY AIR TO THE N OF THE FNT FROM THE VERY MOIST/HUMID AIR MASS OVR OUR AREA. WITH THE FNT ON THE SRN EDGE OF THE WESTERLIES...PARALLEL TO THE UPR LVL FLOW...IT WILL NOT MOVE MUCH THROUGH SUN. MEANWHILE...WEAK WAVES OF LOW PRES WILL MOVE EWD ALG THE FNT. BY SUN NGT AND MON...WITH HGTS FALLING OVR THE ERN U.S. AND THE UPR LVL TROF DEEPENING...THE FNT WILL FINALLY START TO MOVE SWD THRU THE AREA WITH THE FNT THRU THE CWA BY 00Z TUE. PWS IN EXCESS OF 2 INCHES OVR THE AREA THRU MON MORNING WITH PWS SLOWLY COMING DOWN LATE MON AS THE FNT PUSHES THRU THE AREA. PLENTY OF MOISTURE TO WORK WITH THE NEXT COUPLE OF DAYS. THIS COMBINED WITH AFTRN HEATING/INSTABILITY WILL RESULT IN THE DVLPMT OF CONVECTION ESP ALG THE RDGS AND ALG VARIOUS MESOSCALE BOUNDARIES. IN ADDTN...AS THE FNT SAGS SWD SUN NGT AND MON...THE FNT WILL ACT AS AN ADDITIONAL FOCUS FOR CONVECTION. WILL GO WITH LIKELY POPS THIS EVE (MAINLY BFR MIDNIGHT) AND LIKELY POPS AGAIN ON SUN BUT SAY MAINLY AFTRN. WITH FNT SLOWLY SAGGING SWD INTO THE AREA MON NGT WILL CONTINUE WITH LIKELY POPS. FNT SHOULD BE THRU THE NWRN ZNS BY 18Z MON SO WILL ONLY MENTION CHC MORNING SHRA NW ZNS. ELSEWHERE...WILL GO WITH 60 POPS FOR SHRA/TSRA. WITH HIGH PWS AND SLOW MOVEMENT OF CELLS...BIGGEST THREAT THE NEXT DAY OR SO FROM CONVECTION WILL BE FOR HEAVY RAIN AND SCT FLASH FLOODING. HOWEVER...CAN NOT PIN POINT ONE AREA THAT IS MORE VULNERABLE THAN THE REST OF THE AREA SO NO WATCH WILL BE ISSUED. AS FAR AS SVR POTENTIAL IS CONCERNED THE NEXT COUPLE OF DAYS...WET BULB ZERO HEIGHTS REMAIN HIGH SO A VERY LOW THREAT OF LARGE HAIL. AS FAR AS STRONG WINDS ARE CONCERNED...WE WILL HAVE WEAK SHEAR AND LGT WINDS ALOFT SO NOTHING MORE THAN AN ISOLD PULSE TYPE SVR EXPECTED (IF THAT). FNT CLEARS THE AREA BY 00Z TUE AND DRIER AIR MAKES ITS WAY INTO THE AREA TUE/WED AS HIGH PRES BUILDS INTO THE AREA. NEXT CDFNT THRU HERE ON FRI W/ SHRA/TSRA. FCSTID = 15 / DMW DCA 75 89 76 87 / 60 60 60 60 BWI 72 88 72 86 / 60 60 60 60 MRB 72 86 70 85 / 60 60 60 40 IAD 73 89 72 86 / 60 60 60 60 CHO 73 87 72 86 / 60 60 60 60 HGR 69 85 68 84 / 60 60 60 40 NHK 75 88 75 86 / 60 60 60 60 W99 72 86 70 85 / 60 60 60 40 .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE.
DCZ001-MDZ004>007-009>011-013-014-016>018-VAZ021-025>031-036>042- 050>057-WVZ048-054-055-112300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 410 PM EDT SAT AUG 11 2001 ...NUMEROUS THUNDERSTORMS WITH TORRENTIAL RAINS... AT 410 PM EDT DOPPLER RADAR SHOWED NUMEROUS SLOW MOVING STRONG THUNDERSTORMS OVER A WIDE AREA OF NORTHERN AND CENTRAL VIRGINIA AND CENTRAL AND SOUTHERN MARYLAND. MANY OF THE STORMS WERE CONCENTRATED IN AN AREA FROM HOWARD AND MONTGOMERY COUNTIES SOUTH ACROSS THE DISTRICT PRINCE-GEORGES CHARLES FAIRFAX PRINCE-WILLIAM FAUQUIER COUNTIES AND THROUGH THE CENTRAL PIEDMONT COUNTIES OF MADISON ORANGE AND ALBEMARLE. THE GENERAL MOVEMENT OF THESE STORMS WAS A SLOW DRIFT TOWARD THE NORTHEAST BUT MANY WERE SHOWING ERRATIC MOVEMENT OR WERE NEARLY STATIONARY. THE PRIMARY THREAT FROM THESE IS LOCALLY VERY HEAVY RAINS CAPABLE OF PRODUCING RAINFALL RATES OF 2 TO 3 INCHES PER HOUR. LOCALIZED FLOODING OF SMALL STREAMS CREEKS AND PONDING OF WATER ON ROADWAYS UNDERPASSES AND OTHER LOW LYING AREAS IS A DISTINCT POSSIBILTY INTO THIS EVENING UNTIL AT LEAST 6 TO 8 PM. RESIDENTS IN FLOOD PRONE AREAS SHOULD BE ALERT FOR HEAVY RAINS IN THEIR AREA AND BE PREPARED TO SEEK HIGHER GROUND SHOULD FLOODING BE OBSERVED. MOTORISTS SHOULD UNDER NO CIRCUMSTANCE ATTEMPT TO DRIVE INTO FLOOD WATERS. LOCALLY GUSTY WINDS AND HAIL ARE ALSO POSSIBLE IN THE STRONGER THUNDERSTORMS. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS OR UPDATES. FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT HTTP://WWW.NWS.NOAA.GOV/ER/LWX JLW
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Route 50 was flooded at the intersection of Route 259.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2001Every state in 2001This day in weather historyWarnings in West Virginia, August 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5263788.