Alert archive / Virginia / Flash Flood Warnings in 1990
Flash Flood Warning 8, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood warning at Jul 17, 1990, 11:02 PM EDT for Montgomery County, Virginia. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Jul 17, 1990, 11:02 PM EDT (03:02 UTC)
- Expired
- Jul 18, 1990, 12:00 AM EDT
- In force
- 58 min
- Issued by
- NWS Blacksburg, VA
- Area
- Whole counties
County Montgomery County, VA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.0 hours before the alert went out and 129 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.
- Mixed-layer CAPE
- 1617 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KROA 180302 FFWROA VAC121-180500- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ROANOKE VA 1102 PM EDT TUE JUL 17 1990 THE NATIONAL WEATHER SERVICE IN ROANOKE VAHAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 100 AM EDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST VIRGINIA ...MONTGOMERY COUNTY AUTOMATED RAIN GAUGES IN NORTHERN MONTGOMERY COUNTY SHOWS OVER THREE INCHES OF RAIN HAVE FALLEN IN A LITTLE OVER AN HOUR. THUNDERSTORMS REMAIN NEARLY STATIONARY IN NORTHERN MONTGOMERY COUNTY. 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. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OrR 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.
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, Jul 17, 9:11 PM EDT, 1 hour 51 minutes before
VAZALL-180300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ROANOKE VA 905 PM EDT TUE JUL 17 1990 AT 900 PM EDT RADAR SHOWS THUNDERSTORMS AT THE CRAIG MONTGOMERY AND ROANOKE COUNTIES LINES. ALSO A STRONG THUNDERSTORM IN SOUTHERN FRANKLIN COUNTY. THESE THUNDERSTORMS ARE MOVING VERY LITTLE AND COULD HAVE SOME HEAVY DOWNPOURS ALONG WITH DANGEROUS LIGHTNING. SINCE THE GROUND IS ALREADY SATURATED FROM THE RAINS SATURDAY THESE THUNDERSTORMS COULD CAUSE SOME SMALL STREAM FLOODING ALONG WITH SOME LOW AREA FLOODING. CE
Special weather statement, Jul 17, 10:06 PM EDT, 56 minutes before
VAZALL-180400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ROANOKE VA 1000 PM EDT TUE JUL 17 1990 RADAR SHOWS THUNDERSTORMS INCREASING IN DEVELOPMENT IN SOUTHWEST VIRGINIA. AT 1000 PM RADAR SHOWS SOME STRONG ONES IN CRAIG ROANOKE MONTGOMERY FRANKLIN PATRICK NORTHWEST HENRY AND AMHERST COUNTIES. AS THESE THUNDERSTORMS DEVELOP THEY ARE SHOWING VERY LITTLE MOVEMENT. THIS COULD CAUSE SOME VERY HEAVY DOWNPOURS CAUSING SOME SMALL STREAM FLOODING$ ALONG WITH FLOODING IN LOW AREAS. ALSO THESE THUNDERSTORMS COULD PRODUCE SOME DANGEROUS LIGHTNING. CE
Nearby
Flash Flood Warnings in Virginia, 1990Every flash flood warning in 1990
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.