Alert archive / Pennsylvania / Flash Flood Warnings in 1996

Flash Flood Warning 43, NWS Philadelphia/Mount Holly

June 17, 1996Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 17, 1996, 8:14 PM EDT for Chester 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
Jun 17, 1996, 8:14 PM EDT (00:14 UTC)
Expired
Jun 17, 1996, 10:15 PM EDT
In force
2 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Chester County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.2 hours before the alert went out and 182 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 1996-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1713 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 1996-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
1713 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1301 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHL 180015
FFWPHL
PAC029-180215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
814 PM EDT MON JUN 17 1996

THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY NJ HAS
ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1015 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN  PENNSYLVANIA

   ...WESTERN CHESTER COUNTY
 
AT 810 PM...NATIONAL WEATHER SERVICE RADAR INDICATED ADDITIONAL
SHOWERS AND THUNDERSTORMS MOVING INTO WESTERN CHESTER COUNTY.
RADAR ESTIMATED AROUND 4.00 INCHES OF RAIN ACROSS WESTERN PORTIONS
OF CHESTER COUNTY EARLIER THIS AFTERNOON AND EVENING...AND WITH
AN ADDITIONAL 0.50 TO 1.00 INCHES OF RAIN POSSIBLE DURING THE
NEXT ONE TO TWO HOURS FLOODING OF STREAMS AND CREEKS IS POSSIBLE.
 
DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS. THE WATER MAY BE
DEEPER THAN YOU THINK. RAPIDLY RISING WATERS CAN QUICKLY ENGULF
YOUR VEHICLE AND ITS OCCUPANTS...WASHING THEM AWAY. REMEMBER...4
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.

TFG/CHJ

Nearby

Flash Flood Warnings in Pennsylvania, 1996Every flash flood warning in 1996

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.