Alert archive / Virginia / Flash Flood Warnings in 1997

Flash Flood Warning 9, NWS Blacksburg, VA

April 29, 1997Halifax County, Virginia

NWS Blacksburg, VA issued this flash flood warning at Apr 29, 1997, 8:04 AM EDT for Halifax County, Virginia. It was in force for 3 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
Apr 29, 1997, 8:04 AM EDT (12:04 UTC)
Expired
Apr 29, 1997, 11:00 AM EDT
In force
3 hr
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Halifax County, VA

The radar

The Roanoke radar (KFCX), 122 km from the middle of the area, began a volume at 12:03 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

Roanoke, VA (KRNK), launched 12:00Z, 0.1 hours before the alert went out and 69 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, Roanoke, VA at 12:00Z on 1997-04-29Temperature 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, Roanoke, VA at 12:00Z on 1997-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1600 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
-40 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 291204
FFWRNK
VAC083-291500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
804 AM EDT TUE APR 29 1997

THE NATIONAL WEATHER SERVICE IN BLACKSBURG VA HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL 1100 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH CENTRAL VIRGINIA

   ...HALIFAX COUNTY
 
AT 800 AM DOPPLER RADAR AT THE NATIONAL WEATHER SERVICE IN
BLACKSBURG CONTINUED TO INDICATE NUMEROUS SHOWERS AFFECTING HALIFAX
COUNTY.  SOME OF THE SHOWERS WERE PRODUCING BRIEF DOWNPOURS.

WITH SOME ROADS FLOODED AND SMALL STREAMS AND CREEKS NEAR OR
EXCEEDING BANKFULL...THE ADDITIONAL RAIN WILL ONLY ACT TO AGGRAVATE
ANY FLOODING.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!
 

NOGUEIRA

&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 12:13 AM EDTFlash Flood WarningRNKHalifax8 hr
Apr 29, 5:17 AM EDTFlash Flood WarningRNKPittsylvania, City of Danville6 hr

Nearby

Flash Flood Warnings in Virginia, 1997Every flash flood warning in 1997

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.