Alert archive / Pennsylvania / Flash Flood Warnings in 2005

Flash Flood Warning 3, NWS Philadelphia/Mount Holly

April 23, 2005Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Apr 23, 2005, 5:12 PM EDT for Northampton County, Pennsylvania. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 23, 2005, 5:12 PM EDT (21:12 UTC)
Expired: Apr 23, 2005, 9:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Northampton County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 21:14 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

Brookhaven, NY (KOKX), launched 12:00Z, 9.2 hours before the alert went out and 209 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: 37 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 583 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 182 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 
WGUS51 KPHI 232112
FFWPHI
PAC095-240115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
512 PM EDT SAT APR 23 2005

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA

* UNTIL 915 PM EDT

* AT 500 PM EDT...RADAR ESTIMATED ONE TO TWO INCHES OF RAIN HAD
  FALLEN OVER EASTERN PORTIONS OF NORTHAMPTON COUNTY. MORE RAIN WAS
  INDICATED BY RADAR TO BE MOVING NORTHWARD INTO NORTHAMPTON COUNTY
  FOR THE NEXT HOUR OR TWO...AND AN ADDITIONAL HALF INCH OR INCH MAY
  OCCUR THROUGH 700 PM.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WIND GAP...
  NAZARETH...EAST BANGOR...BELFAST AND BATH.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. TURN AROUND, DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 4069 7549 4061 7531 4060 7528 4064 7525
      4070 7525 4085 7513 4092 7514 4081 7548
      4078 7556

$$

Nearby

Flash Flood Warnings in Pennsylvania, 2005 Every flash flood warning in 2005

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.