Alert archive / Pennsylvania / Flash Flood Warnings in 1996

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

January 27, 1996Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jan 27, 1996, 5:42 PM EST for Delaware County, Pennsylvania. It was in force for 5 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
Jan 27, 1996, 5:42 PM EST (22:42 UTC)
Expired
Jan 27, 1996, 10:45 PM EST
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 22:46 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 203 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 12:00Z on 1996-01-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 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 12:00Z on 1996-01-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 550 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
583 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
550 m²/s²
0-3 km storm-relative helicity
814 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 KPHL 272245
FFWPHL
PAC045-280345-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
542 PM EST SAT JAN 27 1996
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1045 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN  PENNSYLVANIA
 
   ...DELAWARE COUNTY
 
AT 530 PM THE STAGE OF THE CHESTER CREEK AT CHESTER WAS 7.8 FEET.
FLOOD STAGE IS 8 FEET. A CREST OF BETWEEN 9 TO 10 FEET IS EXPECTED
AT CHESTER LATE THIS EVENING.
 
IF YOU ARE IN AN AREA PRONE TO FLOODING...MOVE TO HIGHER GROUND
IMMEDIATELY...BEFORE YOUR ACCESS IS CUT OFF BY RISING FLOOD WATERS.
CONTINUE TO MONITOR NOAA WEATHER RADIO...AND YOUR LOCAL RADIO AND
TELEVISION STATIONS FOR THE LATEST INFORMATION ON THE FLOOD WARNING.
 
DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS.  THE DEPTH OF THE
WATER MAY BE HIGHER THAN YOU THINK.  RAPIDLY RISING WATERS CAN
QUICKLY ENGULF YOUR VEHICLE AND ITS OCCUPANTS...WASHING THEM AWAY.
REMEMBER...MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.
 
JJM

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 27, 5:35 PM ESTFlash Flood WarningPHIBucks10 hr

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; radar from the NEXRAD Level II archive.