Alert archive / Pennsylvania / Flash Flood Warnings in 1998

Flash Flood Warning 61, NWS State College, PA

April 19, 1998Huntingdon County, Pennsylvania

NWS State College, PA issued this flash flood warning at Apr 19, 1998, 10:25 PM EDT for Huntingdon County, Pennsylvania. It was in force for 8 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 19, 1998, 10:25 PM EDT (02:25 UTC)
Expired
Apr 20, 1998, 6:25 AM EDT
In force
8 hr
Issued by
NWS State College, PA
Area
Whole counties

County Huntingdon County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.4 hours before the alert went out and 171 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 1998-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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 1998-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -201 square meters per square second.1939587897Sfc1 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
495 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
-201 m²/s²
0-3 km storm-relative helicity
-45 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 KCTP 200229
FFWCTP
PAC061-201025-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1025 PM EDT SUN APR 19 1998

THE NATIONAL WEATHER SERVICE HAS CONTINUED THE FLOOD WARNING
FOR...
  SOUTHERN HUNTINGDON COUNTY - SOUTH CENTRAL PENNSYLVANIA

* UNTIL 625 AM EDT

* MINOR FLOODING IS EXPECTED AROUND-SHIRLEYSBURG
ON THE AUGHWICK CREEK. RUNOFF FROM EARLIER HEAVY RAINS IS EXPECTED
TO CONTINUE TO CAUSE MINOR FLOODING PROBLEMS NEA<R SHIRLEYSBURG FOR
MUCH OF THE NIGHT.

IF YOU ARE IN THESE AREAS... MOVE TO HIGHER GROUND. DO NOT DRIVE
THROUGH WATER COVERING THE ROAD.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLASH FLOODING.

&

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.

NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at Apr 19, 9:25 PM EDT, 1 hour earlier.

Area forecast discussion, Apr 19, 9:25 PM EDT, 1 hour before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
925 PM EDT SUN APR 19 1998

WRKZNS SENT TO PHL AND PIT VIA PHLADMCTP

DISCUSSION...
DOUBLE BARREL LOW PRESSURE AREA...WITH ONE CENTER OVER SW PA AND ONE
CENTER OVER THE DELMARVA AREA WILL CONSOLIDATE AND DEEPEN OFF THE NJ
COAST LATE TONIGHT. BACK EDGE OF THE RAIN IS MOVING RAPIDLY
NORTHEAST ACROSS SOMERSET CO ATTM...AND AFTER COORD WITH PIT AGREED
ON ISSUING THE ZONES AROUND 10 TO 1030 PM WITHOUT ANY HEADLINES...
AS WARNINGS WILL BE EXPIRING AND ANY SIGNIFICANT RAIN WILL BE OVER
AROUND THAT TIME. TIMING OF THE BACK EDGE OF THE RAIN INDICATES THAT
RAIN WILL BE OVER FOR THE SW HALF OF THE CWA BY MIDNIGHT...AND THE
NE HALF BY ABOUT 3 AM.

RADAR ESTIMATES/IFLOWS GAGES AND SPOTTER REPORTS INDICATE RAINFALL
AMOUNTS OF ANYWHERE FROM 1 TO 2.5 INCHES ACROSS THE CWA...WITH RADAR
ESTIMATES INDICATING LOCALIZED 3 TO 3.5 INCH AMOUNTS OVER THE
MID-SUSQUEHANNA VALLEY. WITH A FEW MORE HOURS OF MODERATE RAIN
EXPECTED FOR THE MID AND UPPER SUSQUEHANNA VLY WOULD KEEP THE
HEADLINES GOING FOR A FEW MORE HOURS. WENT WITH RAIN TAPERING TO
DRIZZLE WEST AND NORTH OF THE ALLEGHANY FRONT OVERNIGHT...WITH JUST
RAIN ENDING EAST OF THE RIDGES AS A GOOD DRY PUNCH APPEARS TO BE
AIMED AT SOUTHERN PA...WHILE WRAP AROUND MOISTURE AND A MID-LVL
DEFORMATION ZONE THRU 06Z WILL KEEP SOME DRIZZLE GOING...ESPECIALLY
OVER THE NORTHERN MTNS. HAD A REPORT OF SOME WET SNOW...WITH NO
ACCUMULATION...OVER HIGHER TERRAIN IN POTTER CO EARLIER TODAY...SO
MENTIONED A FEW FLURRIES POSSIBLE OVER HIGHER TERRAIN ACROSS THE
NORTHERN MTNS.

MSE

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 6:16 AM EDTFlash Flood WarningCTPHuntingdon6 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.