Alert archive / Virginia / Flash Flood Warnings in 1993

Flash Flood Warning 13, NWS Blacksburg, VA

March 4, 1993Botetourt County, Montgomery County, Roanoke County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Mar 4, 1993, 11:22 AM EST for Botetourt County, Montgomery County, Roanoke County, Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Mar 4, 1993, 11:22 AM EST (16:22 UTC)
Expired
Mar 4, 1993, 2:30 PM EST
In force
3 hr
Issued by
NWS Blacksburg, VA
Area
Whole counties

Counties Botetourt County, VA, Montgomery County, VA, Roanoke County, VA

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 4.4 hours before the alert went out and 138 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, Greensboro/Hi Pt, NC at 12:00Z on 1993-03-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 1993-03-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 259 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
528 m above ground
0-6 km bulk shear
93 kt
0-1 km storm-relative helicity
259 m²/s²
0-3 km storm-relative helicity
277 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KROA 041625
FFWROA
VAC067-089-161-690-770-023-121-775-041930-
 
FLOOD WARNING
NATIONAL WEATHER SERVICE ROANOKE VIRGINIA
1122 AM EST THU MAR 4 1993
 
THE NATIONAL WEATHER SERVICE IN ROANOKE VIRGINIHAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  230 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION S...
 
IN SOUTH CENTRAL VIRGINIA
 
   ...FRANKLIN COUNTY...HENRY COUNTY...ROANOKE COUNTY
 
  AND THE INDEPENDENT CITIES OF
 
   ...MARTINSVILLE...ROANOKE
 
IN SOUTHWEST VIRGINIA
 
   ...BOTETOURT COUNTY...MONTGOMERY COUNTY
 
  AND THE INDEPENDENT CITY OF
 
   ...SALEM
 
FLOOD WARNINGS HAVE BEEN EXTENDED FOR THE COUNTIES ABOVE.
RADAR IS SHOWING MORE RAIN IS MOVING INTO THE WARNING AREA..MANY STREAMS
AND CREEKS ARE OUT OF THEIR BANKS AT THIS TIME AND SHOULD CONTINUE
THROUGH EARLY THIS AFTERNOON.
 
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 4, 4:04 AM ESTFlash Flood WarningRNKFranklin, Roanoke116 min
Mar 4, 5:40 AM ESTFlash Flood WarningRNKFranklin, Roanoke2 hr
Mar 4, 5:40 AM ESTFlash Flood WarningRNKBotetourt2 hr
Mar 4, 6:10 AM ESTFlash Flood WarningRNKMontgomery110 min
Mar 4, 6:35 AM ESTFlash Flood WarningRNKHenry, City of Martinsville115 min
Mar 4, 8:01 AM ESTFlash Flood WarningRNKMontgomery3 hr
Mar 4, 8:01 AM ESTFlash Flood WarningRNKCity of Roanoke3 hr
Mar 4, 8:01 AM ESTFlash Flood WarningRNKCity of Salem3 hr
Mar 4, 8:01 AM ESTFlash Flood WarningRNKCity of Martinsville3 hr
Mar 4, 8:01 AM ESTFlash Flood WarningRNKBotetourt3 hr
Mar 4, 8:09 AM ESTFlash Flood WarningRNKCampbell3 hr
Mar 4, 11:22 AM ESTFlash Flood WarningRNKFranklin, Henry3 hr

Nearby

Flash Flood Warnings in Virginia, 1993Every flash flood warning in 1993

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.