Alert archive / Virginia / Flash Flood Warnings in 2001

Flash Flood Warning 7, NWS Baltimore/Washington

May 26, 2001Shenandoah County, Virginia

NWS Baltimore/Washington issued this flash flood warning at May 26, 2001, 8:26 PM EDT for Shenandoah County, Virginia. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
May 26, 2001, 8:26 PM EDT (00:26 UTC)
Expired
May 26, 2001, 10:30 PM EDT
In force
2 hr
Issued by
NWS Baltimore/Washington
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Shenandoah County, VA

The radar

The Sterling radar (KLWX), 86 km from the middle of the area, began a volume at 00:29 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.4 hours before the alert went out and 93 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2001-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 309 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2001-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
309 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
541 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS51 KLWX 270027
FFWLWX
VAC171-270230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
826 PM EDT SAT MAY 26 2001

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SHENANDOAH COUNTY IN NORTHWEST VIRGINIA

* UNTIL 1030 PM EDT

* AT 819 PM EDT...WEATHER SERVICE DOPPLER RADAR A BAND OF SLOW 
MOVING THUNDERSTORMS ACROSS NORTHERN AND WESTERN SECTIONS OF 
SHENANDOAH COUNTY.

AUTOMATED RAIN GAGES HAVE REPORTED OVER ONE INCH OF RAINFALL IN A 15 
MINUTE TIME SPAN NEAR MOUNT OLIVE. OTHER GAGES TO THE WEST OF 
WOODSTOCK ARE REPORTING OVER AN INCH AND A HALF OF RAIN DURING THE 
PAST HOUR.

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 CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

LAT...LON 3899 7857 3882 7852 3881 7842 3905 7832

.END/JM!

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at May 26, 2:16 PM EDT, 6 hours 10 minutes earlier.

Area forecast discussion, May 26, 2:16 PM EDT, 6 hours 10 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
216 PM EDT SAT MAY 26 2001

KLWX 88D OTS DUE TO FAILED PART. PART ON ORDER AND SHUD ARRIVE THIS
EVENING.

ALL THREE MDLS HV SIMILAR SOLNS THIS FCST PD.

AXIS OF H5 S/W WHICH WAS PROVIDING LIFT TO SHRAS/TSRAS OVR ERN ZONES
THIS AFTN PROGGED TO BE OVR CNTRL FA BY 00Z TNGT AND NE OF THE FA BY
06Z. ASSOCD RH WL BE OVR NE PTN OF FA BY 00Z THEN ATMOS DRIES OUT A
BIT OVERNGT. WL CONT LIKELY POPS FOR THE EVE OVR ERN FA. OTHERWISE
SKIES SHUD BE PC.

HVIEST PCPN HAS NOT BEEN OVR THE MD ZONES W/LOWEST FFG SO NO NEED
FOR FFA YET. WL CONT TO MONITOR.

DWPTS IN U50S AND L60S WL KEEP TEMPS FM FALLING MUCH TNGT. THUS
PREFER MAV TEMPS OVR LOWER FWC TEMPS.

ON SUN...A FAIRLY STG VORT LOBE PROGGED TO PIVOT ARND GRT LAKES/OH
VLLY UPR LOW INTO THE WRN ZONES. AREA OF HI RH AND DECENT UVV
PROGGED TO ACCOMPANY THIS FEATURE AS IT ROTATES THRU THE NW PART OF
THE FA. H85 WNDS WL INCR TO 25-30 KT. MDLS ALSO HV A SFC TROF MOVG E
THRU FA DUR THE AFTN. THESE FACTORS SUPPORT THE FWC/MAV CHC POPS.
PCPN WL MAINLY BE CONFINED TO THE AFTN. HIEST PROB WL BE IN NW.

WL GO W/COMPROMISE BETW FWC/MAV FOR TEMPS SUN.

SFC BDRY WL BE APPCHG ERN ZONES SUN EVE SO WL CONT CHC POPS THERE.
WL OTHERWISE HV PC FOR SUN NIGHT.

UPR LOW PROGGED TO SHIFT NE AND OPEN UP ON MON. H85 FLOW WL BE
WESTERLY AND AMS WL CONT TO DRY OUT. WL HV P/S OR M/S.

GUID TEMPS SUN NIGHT AND MON LUK RSNBL.

IN THE EXTENDED PD...OLD MRF AND 12Z AVN BOTH HAD STG VORT PIVOTING
THRU THE RGN ON WED BUT RH WAS LIMITED. WL GO MSTLY CLDY INSTEAD OF
PC TO ACCT FOR THIS...OTRW XTENDED PD LUKS QUIET AND REFLECTS CURR
FCST.

.LWX...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.

ARTHUR

In the hours before

Special weather statement, May 26, 6:09 PM EDT, 2 hours 17 minutes before
MDZ002-003-VAZ027-028-WVZ048>052-055-270130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
609 PM EDT SAT MAY 26 2001

...SHOWERS AND THUNDERSTORMS BRINGING HEAVY RAIN TO THE REGION...

SHOWERS AND THUNDERSTORMS ARE INCREASING IN COVERAGE AND INTENSITY
EARLY THIS EVENING ACROSS THE POTOMAC HIGHLANDS AND THE NORTHERN
SHENANDOAH VALLEY.

THESE STORMS HAVE BEEN MOVING VERY SLOWLY... AND ARE PRODUCING HEAVY
RAINFALL. SOME LOCATIONS HAVE REPORTED OVER AN INCH AND A HALF OF
RAIN IN THE SPAN OF ONE HOUR.

THESE STORMS WILL CONTINUE TO PLAGUE THE AREA THROUGH SUNSET... AND
WILL CONTINUE TO PRODUCE VERY HEAVY RAINFALL AMOUNTS. SOME PONDING
OF WAkTER ON ROADWAYS IS LIKELY... AND PERSONS LIVING NEAR SMALL
STREAMS AND CREEKS SHOULD WATCH FOR RAPID RISES IN WATER LEVELS.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

MARGRAF!

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 8:13 PM EDTFlash Flood WarningLWXFrederick, City of Winchester2 hr
May 26, 8:58 PM EDTSevere Thunderstorm WarningLWXClarke32 min
May 26, 10:19 PM EDTFlash Flood WarningLWXFrederick3 hr
May 27, 1:05 PM EDTSevere Thunderstorm WarningLWXClarke, Frederick40 min
May 27, 1:05 PM EDTSevere Thunderstorm WarningLWXShenandoah, Warren40 min
May 27, 1:05 PM EDTSevere Thunderstorm WarningLWXCity of Winchester40 min
May 27, 1:31 PM EDTTornado WarningLWXClarke, Warren29 min
May 27, 1:50 PM EDTSevere Thunderstorm WarningLWXClarke, Fauquier, Loudoun40 min
May 27, 2:25 PM EDTSevere Thunderstorm WarningLWXFairfax, Loudoun50 min
May 27, 2:35 PM EDTSevere Thunderstorm WarningLWXPrince William, City of Manassas, City of Manassas Park40 min
May 27, 2:35 PM EDTSevere Thunderstorm WarningLWXFauquier40 min

Nearby

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

Sources

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.