Alert archive / Virginia / Flash Flood Warnings in 1992

Flash Flood Warning 22, NWS Blacksburg, VA

April 21, 1992Botetourt County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Apr 21, 1992, 3:31 PM EDT for Botetourt County, 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

County Botetourt County, VA

The nearest sounding before it

Huntington/Tri S, WV (KHTS), launched 12:00Z, 7.5 hours before the alert went out and 252 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, Huntington/Tri S, WV at 12:00Z on 1992-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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, Huntington/Tri S, WV at 12:00Z on 1992-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.1939587897Sfc1 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
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

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.

In the hours before

Special weather statement, Apr 21, 12:39 PM EDT, 2 hours 52 minutes before
VAZ009-008-212100

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LYNCHBURG VA
1230 PM EDT TUE APR 21 1992

...A FLASH FLOOD WATCH HAS BEEN ISSUED UNTIL 2 AM WEDNESDAY FOR THE
FOLLOWING COUNTIES...AMHERST...BEDFORD...CAMPBELL...APPOMATTOX...
PITTSYLVANIA...HALIFAX AND CHARLOTTE AND THE INDEPENDENT CITIES OF
LYNCHBURG...DANVILLE...BEDFORD AND SOUTH BOSTON.

PEOPLE LIVING IN THE FLASH FLOOD AREAS SHOULD BE ALERT TO THE
POSSIBILITY OF RISING STREAMS AND INUNDATED ROADWAYS. BE PREPARED TO
MOVE TO HIGHER GROUND IF FLASH FLOODING OCCURS.

STAY TUNED TO NOAA WEATHER RADIO OR LOCAL COMMERCIAL RADIO AND TV
STATIONS FOR UPDATES. KEEP ALERT AND REPORT ANY FLOODING TO YOUR
LOCAL WEATHER OFFICE O!R TO LOCAL LAW ENFORCEMENT FOR RELAY TO THE
NATIONAL WEATHER SERVICE.

MONROE

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 10:02 AM EDTFlash Flood WarningRNKCarroll3 hr
Apr 21, 10:49 AM EDTFlash Flood WarningRNKFranklin, Patrick4 hr
Apr 21, 1:12 PM EDTFlash Flood WarningRNKFloyd, Montgomery, Roanoke3 hr
Apr 21, 1:41 PM EDTFlash Flood WarningRNKBotetourt, Craig2 hr
Apr 21, 2:57 PM EDTFlash Flood WarningRNKFranklin, Patrick3 hr
Apr 21, 3:31 PM EDTFlash Flood WarningRNKCarroll, Grayson, Wythe3 hr
Apr 21, 3:31 PM EDTFlash Flood WarningRNKCraig, Floyd, Montgomery, Roanoke3 hr
Apr 21, 3:59 PM EDTFlash Flood WarningRNKFranklin, Patrick3 hr
Apr 21, 3:59 PM EDTFlash Flood WarningRNKBedford2 hr
Apr 21, 5:59 PM EDTFlash Flood WarningRNKBedford2 hr
Apr 21, 6:44 PM EDTFlash Flood WarningRNKFloyd, Franklin, Patrick, Roanoke3 hr
Apr 21, 6:44 PM EDTFlash Flood WarningRNKCarroll, Grayson3 hr
Apr 21, 6:44 PM EDTFlash Flood WarningRNKBotetourt, Craig3 hr
Apr 21, 6:44 PM EDTFlash Flood WarningRNKMontgomery3 hr

Nearby

Flash Flood Warnings in Virginia, 1992Every 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.