Alert archive / Pennsylvania / Flash Flood Warnings in 1994

Flash Flood Warning 13, NWS Philadelphia/Mount Holly

August 22, 1994Bucks County, Pennsylvania; Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 1994, 4:37 PM EDT for Bucks County, Pennsylvania; Mercer County, New Jersey. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Aug 22, 1994, 4:37 PM EDT (20:37 UTC)
Expired: Aug 22, 1994, 7:45 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Mercer County, NJ, Bucks County, PA

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 8.6 hours before the alert went out and 102 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 64 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 511 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 44 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 222039
FFWPHL
NJC021-PAC017-222345-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
437 PM EDT MON AUG 22 1994
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  745 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN WEST CENTRAL NEW JERSEY
 
   ...MERCER COUNTY
 
IN SOUTHEAST PENNSYLVANIA
 
   ...LOWER BUCKS COUNTY
 
THE NATIONAL WEATHER SERVICE HAS ISSUED FLOOD WARNINGS FOR BOTH MERCER
AND LOWER BUCKS COUNTIES. IN BOTH COUNTIES PERSISTENT HEAVY RAIN HAS
PUSHED STREAMS CLOSE TO BANKFULL. DOPPLER RADAR WAS STILL INDICATING
MODERATE TO HEAVY RAIN PERSISTING OVER THESE COUNTIES DROPPING RAIN
AT THE RATE OF ABOUT THREE TENTHS OF AN INCH PER HOUR. SINCE THE GROUND
IS SATURATED THIS IS RESULTING IN DIRECT RUNOFF INTO AREA STREAMS.
 
IN MERCER COUNTY...THE ASSUNPINK CREEK WAS UP TO 6.7 FEET AND RISING.
FLOOD STAGE IS 7 FEET AND THIS SHOULD BE REACHED BETWEEN 5 AND 6 PM.
IN BUCKS COUNTY...THE NESHAMINY CREEK IN LANGHORNE WAS UP TO 8.5 FT.
FLOOD STAGE IS 9 FEET AND THIS SHOULD BE REACHED ALSO BETWEEN 5 AND 6
PM.
 
IF YOU ARE IN THE WARNED COUNTY IN AN AREA SUBJECT TO FLOODING
MOVE TO HIGHER GROUND.  DO NOT DRIVE THROUGH FLOOD WATERS.
CLIMBING ATOP YOUR STALLED VEHICLE WILL NOT PREVENT YOU FROM
BEING SWEPT INTO DANGEROUS STREAM CONDITIONS AS WATER LEVELS RISE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 8:46 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	44 min
Aug 21, 8:50 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland	55 min
Aug 21, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	33 min
Aug 22, 1:25 AM EDT	Flash Flood Warning	PHI	Mercer	95 min
Aug 22, 3:15 AM EDT	Flash Flood Warning	PHI	Mercer	3 hr
Aug 22, 5:06 PM EDT	Flash Flood Warning	PHI	Camden	4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1994 Flash Flood Warnings in New Jersey, 1994 Every flash flood warning in 1994

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.