Alert archive / Pennsylvania / Flash Flood Warnings in 1998

Flash Flood Warning 191, NWS Pittsburgh, PA

September 19, 1998Fayette County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Sep 19, 1998, 6:03 PM EDT for Fayette County, Pennsylvania. It was in force for 117 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 19, 1998, 6:03 PM EDT (22:03 UTC)
Expired
Sep 19, 1998, 8:00 PM EDT
In force
117 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Fayette County, PA

The radar

The Pittsburgh radar (KPBZ), 84 km from the middle of the area, began a volume at 22:02 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

Pittsburgh, PA (KPIT), launched 12:00Z, 10.1 hours before the alert went out and 67 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 12:00Z on 1998-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 764 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 12:00Z on 1998-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.1939Sfc1 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
764 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
801 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
8 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 KPIT 192206
FFWPIT
PAC051-200000-

BULLETIN - EAS ACTIVIATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
603 PM EDT SAT SEP 19 1998

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FAYETTE COUNTY IN SOUTHWESTERN PENNSYLVANIA.

* UNTIL 800 PM EDT.

* AT 600 PM EDT... AREA LAW ENFORCEMENT AND DOPPLER RADAR INDICATED
AN AREA OF VERY  HEAVY RAIN BETWEEN FAIRCHANCE AND UNIONTOWN...
MOVING EAST AT 10 MPH.

* SEVERAL THUNDERSTORMS MOVING OVER THE SAME GENERAL AREA CAUSING
  BASEMENT FLOODING AND FLOODING OF ROADWAYS. SEVERAL PEOPLE
  WERE TRAPPED IN THEIR CARS..

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

.END/JK
"

&

Nearby

Flash Flood Warnings in Pennsylvania, 1998Every flash flood warning in 1998

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.