Alert archive / North Carolina / Flash Flood Warnings in 1992

Flash Flood Warning 14, NWS Blacksburg, VA

April 20, 1992Alleghany County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Apr 20, 1992, 11:44 PM EDT for Alleghany County, North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 20, 1992, 11:44 PM EDT (03:44 UTC)
Expired
Apr 21, 1992, 2:45 AM EDT
In force
3 hr
Issued by
NWS Blacksburg, VA
Area
Whole counties

County Alleghany County, NC

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.7 hours before the alert went out and 119 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 1992-04-21Temperature 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 1992-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
NaN m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGSO 210344
FFWGSO
NCC005-210645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE GREENSBORO NC
1144 PM EDT MON APR 20 1992

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 245 AM EDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE STATE OF NORTH CAROLINA
      ALLEGHANY

AT 1140 PM FLOODING CONTINUED TO BE REPORTED ALONG THE SOUTH FORK
OF THE NEW RIVER IN ALLEGHANY COUNTY. SHERIFF DEPARTMENT REPORTED
ANOTHER BRIDGE UNDER WATER ON THE WEST END OF SPARTA. EARLIER
THIS EVENING A RAINFALL OBSERVER IN SPARTA REPORTED A TOTAL OF
4.27 INCHES OF RAIN DURING THE PRECEEDING 24 HOURS.

A FLASH FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT.
PEOPLE IN THE WARNED AREA SHOULD TAKE IMMEDIATE ACTION TO PROTECT
LIFE AND PROPERTY.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE 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 IMMEDIATELY.
REMEMBER..MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.

 IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
 IMMEDIATELY.  WHEN IT IS SAFE..ASK YOUR NEAR2EST LAW ENFORCEMENT
 AGENCY TO RELAY YOUR SEVERE WEATHER REPORT TO THE LOCAL NATIONAL
 WEATHER SERVICE OFFICE.

 ELJ

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, Apr 20, 9:43 PM EDT, 2 hours 1 minute before
VAC035-077-210345-

SPECIAL WEATHER STATMENT
NATIONAL WEATHER SERVICE ROANOKE VA
941 PM EDT MON APR 20 1992

...HEAVY RAIN MOVING INTO CARROLL AND GRAYSON COUNTIES...

AT 930 PM RADAR AND AUTOMATED RAIN GAGE REPORTS SHOW SOME MODERATE TO
HEAVY HEAVY RAIN MOVING THROUGH CARROLL AND GRAYSON COUNTIES IN
SOUTHWEST VIRGINIA. THE SOUTHERN SECTIONS OF CARROLL COUNTY HAVE
ALREADY RECEIVED OVER 3 INCHES OF RAIN DURING THE PAST 24 HOURS.

THERE HAVE BEEN NO REPORTS OF ANY FLOOD PROBLEMS...BUT THIS AMOUNT OF
RAIN HAS PROBABLY BROUGHT MOST CREEKS AND SMALL STREAMS TO NEAR
BANKFULL. WATER WILL ALSO BE PONDING IN LOW LYING AND POOR DRAINAGE
AREAS. PEOPLE IN FLOOD PRONE AREAS OF CARROLL AND GRAYSON COUNTIES...
ESPECIALLY THE SOUTHERN SECTIONS...SHOULD BE ALERT TO POSSIBLE FLOOD
PROBLEMS SHOULD THE HEAVY RAIN CONTINUE.

JACKSON
Special weather statement, Apr 20, 9:46 PM EDT, 1 hour 58 minutes before
VAC035-077-210345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ROANOKE VA
945 PM EDT MON APR 20 1992

...HEAVY RAIN MOVING INTO CARROLL AND GRAYSON COUNTIES...

AT 930 PM RADAR AND AUTOMATED RAIN GAGE REPORTS SHOW SOME MODERATE TO
HEAVY RAIN MOVING THROUGH CARROLL AND GRAYSON COUNTIES IN
SOUTHWEST VIRGINIA. THE SOUTHERN SECTIONS OF CARROLL COUNTY HAVE
ALREADY RECEIVED OVER 3 INCHES OF RAIN DURING THE PAST 24 HOURS.

THERE HAVE BEEN NO REPORTS OF ANY FLOOD PROBLEMS...BUT THIS AMOUNT OF
RAIN HAS PROBABLY BROUGHT MOST CREEKS AND SMALL STREAMS TO NEAR
BANKFULL. WATER WILL ALSO BE PONDING IN LOW LYING AND POOR DRAINAGE
AREAS. PEOPLE IN FLOOD PRONE AREAS OF CARROLL AND GRAYSON COUNTIEPS...
ESPECIALLY THE SOUTHERN SECTIONS...SHOULD BE ALERT TO POSSIBLE FLOOD
PROBLEMS SHOULD THE HEAVY RAIN CONTINUE.

JACKSON

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 9:27 PM EDTFlash Flood WarningRNKAlleghany3 hr
Apr 21, 5:14 PM EDTFlash Flood WarningRNKSurry3 hr
Apr 21, 5:53 PM EDTFlash Flood WarningRNKDavidson, Guilford3 hr
Apr 21, 6:07 PM EDTFlash Flood WarningRNKDavidson, Guilford3 hr
Apr 21, 7:11 PM EDTFlash Flood WarningRNKIredell2 hr
Apr 21, 7:57 PM EDTFlash Flood WarningRNKRandolph3 hr

Nearby

Flash Flood Warnings in North Carolina, 1992Every flash flood warning in 1992

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.