Alert archive / Pennsylvania / Flash Flood Warnings in 1998

Flash Flood Warning 35, NWS Pittsburgh, PA

April 10, 1998Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Apr 10, 1998, 4:33 AM EDT for Westmoreland County, Pennsylvania. It was in force for 2 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 10, 1998, 4:33 AM EDT (08:33 UTC)
Expired
Apr 10, 1998, 6:34 AM EDT
In force
2 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 68 km from the middle of the area, began a volume at 08:32 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 00:00Z, 8.6 hours before the alert went out and 55 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 1998-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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 1998-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -58 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
3 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
750 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-58 m²/s²
0-3 km storm-relative helicity
9 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 100834 COR
FFWPIT
PAC129-101028-

FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE PITTSBURGH PA
433 AM EDT FRI APR 10 1998

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS EXTENDED THE

* FLOOD WARNING FOR...
  WESTMORELAND COUNTY IN SOUTHWESTERN PENNSYLVANIA

* UNTIL 634 AM EDT

* AT 420 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN IS MOVING OUT OF HEMPFIELD TOWNSHIP... MOVING SOUTHWEST
AT 20 MPH.

* ONE AND A HALF FEET OF WATER WAS REPORTED ON FRY HOLLOW ROAD IN
HEMPFIELD TOWNSHIP NEAR NEW STANTON.
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

DAVIS/DEMARIS


&

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 10, 1:31 AM EDTFlash Flood WarningPBZWestmoreland3 hr
Apr 10, 4:31 AM EDTFlash Flood WarningPBZWestmoreland2 hr
Apr 10, 6:25 AM EDTFlash Flood WarningPBZWestmoreland4 hr

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.