Alert archive / Maryland / Flash Flood Warnings in 1990

Flash Flood Warning 60, NWS Charleston, WV

July 12, 1990Allegany County, Maryland

NWS Charleston, WV issued this flash flood warning at Jul 12, 1990, 11:50 PM EDT for Allegany County, Maryland. It was in force for 115 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1990, 11:50 PM EDT (03:50 UTC)
Expired
Jul 13, 1990, 1:45 AM EDT
In force
115 min
Issued by
NWS Charleston, WV
Area
Whole counties

County Allegany County, MD

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

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.8 hours before the alert went out and 134 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, Washington/Dulle, VA at 00:00Z on 1990-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 310 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, Washington/Dulle, VA at 00:00Z on 1990-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
310 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
881 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KEKN 130350
FFWEKN
WVC077-MDC001-130545-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
URBAN AND SMALL STREAM FLOOD WARNING
NATIONAL WEATHER SERVICE ELKINS WV
1150 PM EDT THU JUL 12 1990
 
THE NATIONAL WEATHER SERVICE IN ELKINS HAS ISSUED A
URBAN AND SMALL STREAM FLOOD WARNING EFFECTIVE UNTIL  145 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHERN WEST VIRGINIA
 
   ...EASTERN PRESTON COUNTY
 
IN WEST MARYLAND
 
   ...WESTERN ALLEGANY COUNTY
 
ALLEGANY COUNTY CIVIL DEFENSE REPORTS SOME URBAN FLOODING OVER THE
WESTERN SECTION OF ALLEGANY COUNTY MAINLY IN THE WESTERNPORT AREA.
FLOODING TO BASEMENTS AND POOR DRAINAGE AREAS HAVE BEEN REPORTED.
WEATHER RADAR CONTINUES TO SHOW MODERATE RAIN OVER THIS AREA. SMALL
STREAMS AND CREEKS MAY OVERFLOW THEIR BANKS.
 
URBAN AND SMALL STREAM FLOODING IS POSSIBLE ACROSS EASTERN PRESTON
COUNTY WEST VIRGINIA AS MODERATE RAINS CONTINUE IN THIS AREA.
 
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. IF SMALL STREAMS START RISING MOVE TO HIGHER GROUND.
 
TO REPORT FLOODING ASK YOUR POLICE TO FORWARD YOUR REPORT TO THE LOCAL
NATIONAL WEATHER SERVICE OFFICE.
 
GILKERSON
NNNN

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 12, 11:34 PM EDTFlash Flood WarningRLXGarrett116 min
Jul 13, 12:42 AM EDTFlash Flood WarningRLXAllegany, Garrett3 hr
Jul 13, 5:22 AM EDTFlash Flood WarningRLXGarrett3 hr

Nearby

Flash Flood Warnings in Maryland, 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.