Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 29, NWS Cleveland, OH

July 15, 1990Lawrence County, Pennsylvania

NWS Cleveland, OH issued this flash flood warning at Jul 15, 1990, 1:07 AM EDT for Lawrence County, Pennsylvania. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 15, 1990, 1:07 AM EDT (05:07 UTC)
Expired
Jul 15, 1990, 3:15 AM EDT
In force
2 hr
Issued by
NWS Cleveland, OH
Area
Whole counties

County Lawrence County, PA

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

Pittsburgh, PA (KPIT), launched 00:00Z, 5.1 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, Pittsburgh, PA at 00:00Z on 1990-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 196 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, Pittsburgh, PA at 00:00Z on 1990-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 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
196 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
784 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KYNG 150508
FFWYNG
PAC073-150715-
 
BULLETIN - EBS ACTIVATION REQUESTED
SMALL STREAM AND URBAN FLOOD WARNING
NATIONAL WEATHER SERVICE YOUNGSTOWN OH
107 AM EDT SUN JUL 15 1990
 
THE NATIONAL WEATHER SERVICE IN YOUNGSTOWN HAS ISSUED A
SMALL STREAM AND URBAN FLOOD WARNING EFFECTIVE UNTIL  315 AM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHWEST PENNSYLVANIA
          ...LAWRENCE
 
AT 100 AM EDT WEATHER RADAR INDICATED RAINFALL AMOUNTS OF 1.8 INCHES
IN TWO AND A HALF HOURS IN NORTHWEST LAWRENCE COUNTY.
 
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 Cleveland, OH issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 15, 1:59 AM EDTFlash Flood WarningCLEMercer2 hr
Jul 15, 2:06 AM EDTFlash Flood WarningCLECrawford3 hr
Jul 15, 3:10 AM EDTFlash Flood WarningCLELawrence, Mercer3 hr
Jul 15, 4:40 AM EDTFlash Flood WarningCLEVenango3 hr
Jul 15, 5:26 AM EDTFlash Flood WarningCLEWarren3 hr
Jul 15, 5:44 AM EDTFlash Flood WarningCLECrawford3 hr
Jul 15, 7:39 AM EDTFlash Flood WarningCLECrawford, Venango, Warren2 hr
Jul 15, 9:53 AM EDTFlash Flood WarningCLECrawford, Venango, Warren3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 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.