Alert archive / Virginia / Flash Flood Warnings in 1992

Flash Flood Warning 30, NWS Blacksburg, VA

April 21, 1992Carroll County, Grayson County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Apr 21, 1992, 6:44 PM EDT for Carroll County, Grayson County, Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 21, 1992, 6:44 PM EDT (22:44 UTC)
Expired: Apr 21, 1992, 9:45 PM EDT
In force: 3 hr
Issued by: NWS Blacksburg, VA
Area: Whole counties

Counties Carroll County, VA, Grayson County, VA

The nearest sounding before it

Huntington/Tri S, WV (KHTS), launched 12:00Z, 10.7 hours before the alert went out and 230 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 212246
FFWROA
VAC067-141-161-770-023-035-045-063-077-121-640-775-220145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ROANOKE VA
644 PM EDT TUE APR 21 1992
 
THE NATIONAL WEATHER SERVICE IN ROANOKE VA HAS CONTINUED
FLASH FLOOD WARNINGS EFFECTIVE UNTIL  945 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL VIRGINIA
 
   ...FRANKLIN COUNTY...PATRICK COUNTY...ROANOKE COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...ROANOKE
 
IN SOUTHWEST VIRGINIA
 
   ...BOTETOURT COUNTY...CARROLL COUNTY...CRAIG COUNTY...FLOYD COUNTY
   ...GRAYSON COUNTY...MONTGOMERY COUNTY
 
  AND THE INDEPENDENT CITIES OF
 
   ...GALAX...SALEM
 
HEAVY RAINS HAVE CONTINUED ACROSS A WIDE SECTION OF SOUTHWEST AND WEST
CENTRAL VIRGINIA. IN THE ROANOKE AREA HEAVIEST RAINS ARE CURRENTLY
ALONG THE SOUTH SLOPES OF THE BLUE RIDGES FROM GRAYSON AND CARROLL
COUNTIES NORTHWARD THROUGH FLOYD...PATRICK FRANKLIN...ROANOKE...
BE@DFORD...BOTETOURT COUNTIES AND NORTHWARD.
 
END/MCINTOSH

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	Craig, Floyd, Montgomery, Roanoke	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	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.