Alert archive / Virginia / Flash Flood Warnings in 1992

Flash Flood Warning 17, NWS Blacksburg, VA

April 21, 1992Floyd County, Montgomery County, Roanoke County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Apr 21, 1992, 1:12 PM EDT for Floyd County, Montgomery County, Roanoke County, Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 21, 1992, 1:12 PM EDT (17:12 UTC)
Expired
Apr 21, 1992, 4:15 PM EDT
In force
3 hr
Issued by
NWS Blacksburg, VA
Area
Whole counties

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

The nearest sounding before it

Huntington/Tri S, WV (KHTS), launched 12:00Z, 5.2 hours before the alert went out and 242 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 211714
FFWROA
VAC161-770-063-121-775-212015-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ROANOKE VA
112 PM EDT TUE APR 21 1992
 
THE NATIONAL WEATHER SERVICE IN ROANOKE VA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  415 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL VIRGINIA
 
   ...ROANOKE COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...ROANOKE
 
IN SOUTHWEST VIRGINIA
 
   ...FLOYD COUNTY...MONTGOMERY COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...SALEM
 
RAINFALL DATA...SPOTTERS REPORTS AND EMERGENCY SERVICES PERSONNEL
REPORT THAT MANY SMALL STREAMS IN THE WARNED AREA ARE AT OR ABOVE
BANKFULL. THESE STREAMS WILL CONTINUE A RAPID RISE AS AN AREA OF HEAVY
RAINFALL MOVES ACROSS THE REGION DURING THE NEXT FEW HOURS.
 
SPECIFICALLY...THE LITTLE RIVER IN THE RINER,VA AREA IN FLOYD COUNTY
IS REPORTED OVER ITS BANKS. MEADOWS CREEK ROAD...RT 658 IN FLOYD IS
IMPASSABLE. BRUSH CREEK IN FLOYD COUNTY IS ALMOST AT BANKFULL AND
RISING RAPIDLY.  IN ROANOKE COUNTY...PETERS CREEK IS OVER ITS BANKS
AND SOME RESIDENTS ARE BEING ALERTED FOR POSSIBLE EVACUATION.
 
LATEST AUTOMATED RAINFALL GAGES SHOW THE WARNED AREA HAS RECEIVED...ON
THE AVERAGE...ABOUT 2 INCHES OF RAIN THE PAST 12 HOURS. SOME LOCATIONS
HAVE RECEIVED AS MUCH AS 4 INCHES OF RAIN.
 
WEATHER SERVICE RADAR SHOW RAIN COVERING MOST OF WEST CENTRAL AND
SOUTHWEST VIRGINIA. THE HEAVIEST RAIN IS ALONG A BAND EXTENDING FROM
BOTETOURT TO ROANOKE INTO PATRICK COUNTIES. THIS HEAVY RAIN IS WORKING
ITS WAY ONLY SLOWLY EASTWARD.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
 
MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES.  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.
 
END/MCINTOSH

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, 33 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, 1:41 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, 3:31 PM EDTFlash Flood WarningRNKBotetourt3 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.