Alert archive / Virginia / Flash Flood Warnings in 1992

Flash Flood Warning 21, NWS Blacksburg, VA

April 21, 19924 counties in Virginia

NWS Blacksburg, VA issued this flash flood warning at Apr 21, 1992, 3:31 PM EDT for 4 counties in Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 21, 1992, 3:31 PM EDT (19:31 UTC)
Expired: Apr 21, 1992, 6:30 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Whole counties

Counties Craig County, VA, Floyd County, VA, Montgomery County, VA, Roanoke County, VA

The nearest sounding before it

Huntington/Tri S, WV (KHTS), launched 12:00Z, 7.5 hours before the alert went out and 237 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: 67 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1231 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KROA 211934
FFWROA
VAC161-770-023-035-045-063-077-121-197-640-775-212230-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ROANOKE VA
331 PM EDT TUE APR 21 1992
 
THE NATIONAL WEATHER SERVICE IN ROANOKE VA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  630 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL VIRGINIA
 
   ...ROANOKE COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...ROANOKE
 
IN SOUTHWEST VIRGINIA
 
   ...BOTETOURT COUNTY...CARROLL COUNTY...CRAIG COUNTY...FLOYD COUNTY
   ...GRAYSON COUNTY...MONTGOMERY COUNTY...WYTHE COUNTY
 
  AND THE INDEPENDENT CITIES OF
 
   ...GALAX...SALEM
 
WEATHER SERVICE RADAR CONTINUES TO SHOW HEAVY RAINS OVER ALL COUNTIES
ALONG BOTH SIDES OF THE BLUE RIDGE. SPOTTER AND OTHER REPORTS REVEAL
THAT FLOODING CONTINUES OVER ALL THE WARNED COUNTIES.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUmTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
 
CUNNINGHAM

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 10:02 AM EDT	Flash Flood Warning	RNK	Carroll	3 hr
Apr 21, 10:49 AM EDT	Flash Flood Warning	RNK	Franklin, Patrick	4 hr
Apr 21, 1:12 PM EDT	Flash Flood Warning	RNK	Floyd, Montgomery, Roanoke	3 hr
Apr 21, 1:41 PM EDT	Flash Flood Warning	RNK	Botetourt, Craig	2 hr
Apr 21, 2:57 PM EDT	Flash Flood Warning	RNK	Franklin, Patrick	3 hr
Apr 21, 3:31 PM EDT	Flash Flood Warning	RNK	Carroll, Grayson, Wythe	3 hr
Apr 21, 3:31 PM EDT	Flash Flood Warning	RNK	Botetourt	3 hr
Apr 21, 3:59 PM EDT	Flash Flood Warning	RNK	Franklin, Patrick	3 hr
Apr 21, 3:59 PM EDT	Flash Flood Warning	RNK	Bedford	2 hr
Apr 21, 5:59 PM EDT	Flash Flood Warning	RNK	Bedford	2 hr
Apr 21, 6:44 PM EDT	Flash Flood Warning	RNK	Floyd, Franklin, Patrick, Roanoke	3 hr
Apr 21, 6:44 PM EDT	Flash Flood Warning	RNK	Carroll, Grayson	3 hr
Apr 21, 6:44 PM EDT	Flash Flood Warning	RNK	Botetourt, Craig	3 hr
Apr 21, 6:44 PM EDT	Flash Flood Warning	RNK	Montgomery	3 hr

Nearby

Flash Flood Warnings in 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.