Alert archive / Virginia / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS Blacksburg, VA

August 25, 1999Henry County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Aug 25, 1999, 5:08 AM EDT for Henry County, Virginia. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 25, 1999, 5:08 AM EDT (09:08 UTC)
Expired
Aug 25, 1999, 7:10 AM EDT
In force
2 hr
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Henry County, VA

The radar

The Roanoke radar (KFCX), 46 km from the middle of the area, began a volume at 09:12 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 9.1 hours before the alert went out and 68 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 00:00Z on 1999-08-25Temperature 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 00:00Z on 1999-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.19395878Sfc1 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
1510 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
64 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 250908
FFWRNK
VAC089-251110-

BULLETIN--IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING FOR SMALL CREEKS AND STREAMS
NATIONAL WEATHER SERVICE BLACKSBURG VA
508 AM EDT WED AUG 25 1999

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* FLOOD WARNING FOR SMALL CREEKS AND STREAMS FOR...
  HENRY COUNTY IN SOUTH CENTRAL VIRGINIA.

* UNTIL 710 AM EDT.

* AT 504 AM EDT... AUTOMATED RAINFALL GAGES INDICATED VERY HEAVY
  RAINFALL ALONG JORDAN CREEK...IMMEDIATELY TO THE WEST OF
  MARTINSVILLE.  SHOWERS AND THUNDERSTORMS WILL MOVE NORTH ACROSS
  THE AREA AT AROUND 20 MPH.  THE STORMS MAY PRODUCE AN
  ADDITIONAL ONE TO TWO INCHES OF RAIN OVER THE NEXT COUPLE OF
  HOURS.

* AUTOMATED RAIN GAGES HAVE INDICATED RAINFALL AMOUNTS IN EXCESS OF
  FOUR INCHES ALONG JORDAN CREEK SINCE 200 AM.


<< CALL TO ACTION >> DON'T DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD!

.END/JH/HH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 1:09 PM EDTSevere Thunderstorm WarningRNKWythe36 min
Aug 25, 1:12 PM EDTSevere Thunderstorm WarningRNKPulaski63 min

Nearby

Flash Flood Warnings in Virginia, 1999Every flash flood warning in 1999

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; radar from the NEXRAD Level II archive.