Alert archive / Maryland / Flash Flood Warnings in 1992

Flash Flood Warning 21, NWS Baltimore/Washington

April 22, 1992Washington County, Maryland; Morgan County, West Virginia

NWS Baltimore/Washington issued this flash flood warning at Apr 22, 1992, 1:45 AM EDT for Washington County, Maryland; Morgan County, West Virginia. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Apr 22, 1992, 1:45 AM EDT (05:45 UTC)
Expired: Apr 22, 1992, 4:00 AM EDT
In force: 2 hr
Issued by: NWS Baltimore/Washington
Area: Whole counties

Counties Washington County, MD, Morgan County, WV

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 5.8 hours before the alert went out and 89 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 230 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 269 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KWBC 220540
FFWWBC
MDC021-043-VAC187-043-069-171-840-WVC003-037-065-220800-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WASHINGTON DC
145 AM EDT WED APR 22 1992
 
THE NATIONAL WEATHER SERVICE IN WASHINGTON HAS EXTENDED THE
FLASH FLOOD WARNING UNTIL  400 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL MARYLAND
 
   ...FREDERICK COUNTY
 
IN WEST CENTRAL MARYLAND
 
   ...WASHINGTON COUNTY
 
IN NORTH CENTRAL VIRGINIA
 
   ...WARREN COUNTY
 
IN NORTHWEST VIRGINIA
 
   ...CLARKE COUNTY...FREDERICK COUNTY...SHENANDOAH COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...WINCHESTER
 
 
IN NORTHEAST WEST VIRGINIA
 
   ...BERKELEY COUNTY...JEFFERSON COUNTY...MORGAN COUNTY
 
DOPPLER RADAR AT STERLING VIRGINIA SHOWS LIGHT RAIN PERSISTING OVER
FREDERICK AND WASHINGTON COUNTIES IN CENTRAL MARYLAND. THIS RAIN WILL
END WITHIN THE HOUR. RAIN HAS ALREADY ENDED OVER THE REMAINDER OF
THE WARNING AREA. HOWEVER...MANY ROADS AND SMALL STREAMS REMAIN
FLOODED. THE FLOODING WILL BEGIN TO SUBSIDE DURING THE NEXT FEW HOURS.
 
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 ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  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.
 
BRADY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 11:44 PM EDT	Flash Flood Warning	LWX	Washington	2 hr
Apr 21, 11:44 PM EDT	Flash Flood Warning	LWX	Frederick	2 hr
Apr 22, 1:45 AM EDT	Flash Flood Warning	LWX	Frederick	2 hr
Apr 21, 9:03 PM EDT	Flash Flood Warning	LWX	Morgan	3 hr
Apr 21, 9:30 PM EDT	Flash Flood Warning	LWX	Berkeley, Jefferson	5 hr
Apr 22, 1:45 AM EDT	Flash Flood Warning	LWX	Berkeley, Jefferson	2 hr

Nearby

Flash Flood Warnings in Maryland, 1992 Flash Flood Warnings in West Virginia, 1992 Every flash flood warning in 1992

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.