Alert archive / Virginia / Flash Flood Warnings in 1990

Flash Flood Warning 11, NWS Blacksburg, VA

August 16, 1990Charles City County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Aug 16, 1990, 4:20 PM EDT for Charles City County, Virginia. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Aug 16, 1990, 4:20 PM EDT (20:20 UTC)
Expired
Aug 16, 1990, 5:15 PM EDT
In force
55 min
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Charles City 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.3 hours before the alert went out and 159 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, Wallops Is Stn, VA at 12:00Z on 1990-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1794 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, Wallops Is Stn, VA at 12:00Z on 1990-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 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
1794 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
610 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Aug 16, 1:09 PM EDT, 3 hours 11 minutes before
VAZALL-161800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ROANOKE VA
100 PM EDT THU AUG 16 1990

...THUNDERSTORMS DEVELOPING OVER PORTIONS OF VIRGINIA...INCLUDING THE
    SOUTHWEST SECTOR...
OVER THE NOON HOUR SCATTERED SHOWERS AND THUNDERSTORMS BEGAN TO POP UP
OVER SOUTHWEST VIRGINIA...MOSTLY FROM JUST SOUTHEAST OF ROANOKE INTO
FRANKLIN...EASTERN PATRICK...PULASKI AND HENRY COUNTIES EXTENDING
ACROSS THE STATE LINE INTO NORTH CAROLINA.

WEATHER RADAR AND AUTOMATED RAIN GAGES SHOWED THAT HEAVIEST RAINS WERE
OVER PATRICK COUNTY...WHERE AMOUNTS OF OVER FOUR-TENTHS OF AN INCH WERE
RECORDED IN A 15 MINUTE PERIOD.

THUNDERSTORMS WILL BE MOVING SLOWLY THIS AFTERNOON IN AN EAST AND
SOUTHEAST DIRECTION.    PEOPLE SHOULD BE PREPARED FOR DOWNPOURS THAT
WILL POND WATER AND CAUSE DIFFICULT DRIVING CONDITIONS. THE PRIMARY
THREAT IS EXPECTED TO BE EAST OF THE BLUE RIDGES. END/MCINTOS
Special weather statement, Aug 16, 3:14 PM EDT, 1 hour 6 minutes before
VAZALL-170100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ROANOKE VA
300 PM EDT THU AUG 16 1990

...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHCENTRAL AND SOUTH
EAST VIRGINIA AND CENTRAL NORTH CAROLINA UNTIL 900 PM...

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 900 PM THIS EVENING
THAT COVERS PORTIONS OF THE ROANOKE WEATHER OFFICE AREA OF
RESPONSIBILITY.  THESE COUNTIES...ON THE WESTERN EDGE OF THE WATCH
AREA...ARE FRANKLIN...PATRICK AND HENRY...INCLUDING THE CITY OF
MARTINSVILLE.  BEDFORD COUNTY AND THE CITY OF BEDFORD ARE ALSO IN
THE WATCH AREA. GENERALLY...THE THREAT AREA IS ALONG AND EAST OF
THE BLUE RIDGES.

AT 3 PM THUNDERSTORMS WERE SCATTERED ABOUT SOUTHWEST AND SOUTHCENTRAL
VIRGINIA...WITH STRONGEST STORMS ALONG THE COUNTY LINE BETWEEN HENRY
AND FRANKLIN COUNTIES. THESE STORMS WILL BE MOVING EASTSOUTHEAST INTO
NORTHERN HENRY AND PITTSYLVANIA COUNTIES VERY SOON. THESE STORMS WILL
LIKELY BE ACCOMPANIED BY HEAVXY DOWNPOURS...DANGEROUS LIGHTNING AND
HAIL.
END/MCINTOSH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 2:39 PM EDTFlash Flood WarningRNKCharles City66 min
Aug 16, 2:39 PM EDTSevere Thunderstorm WarningRNKCharles City66 min
Aug 16, 4:20 PM EDTSevere Thunderstorm WarningRNKCharles City55 min
Aug 16, 4:31 PM EDTFlash Flood WarningRNKHalifax59 min
Aug 16, 4:31 PM EDTSevere Thunderstorm WarningRNKHalifax59 min

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.