Alert archive / Pennsylvania / Flash Flood Warnings in 1997

Flash Flood Warning 1, NWS Philadelphia/Mount Holly

January 25, 1997Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jan 25, 1997, 10:50 AM EST for Delaware County, Pennsylvania. It was in force for 3 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 25, 1997, 10:50 AM EST (15:50 UTC)
Expired
Jan 25, 1997, 1:50 PM EST
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Delaware County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.8 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 1997-01-25Temperature 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 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 12:00Z on 1997-01-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.1939587897117Sfc1 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
818 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
173 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 251550
FFWPHL
PAC045-251850-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
1050 AM EST SAT JAN 25 1997

THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY NJ HAS
ISSUED A FLOOD WARNING EFFECTIVE UNTIL 150 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN  PENNSYLVANIA

...DELAWARE COUNTY
 
AT 1030 AM THIS MORNING THE GAGE READING AT CHADDS FORD ON
BRANDYWINE CREEK WAS VERY CLOSE TO FLOOD STAGE AND RISING
SLOWLY. THE CREEK IS EXPECTED TO CREST AROUND 9.5 FEET IN THE
NEXT HOUR OR TWO...THEN WILL RECEDE.

STAY TUNED TO NOAA WEATHER RADIO...THE VOICE OF THE NATIONAL WEATHER
SERVICE...OR TO COMMERCIAL RADIO OR TELEVISION STATIONS FOR THE
LATEST STORM INFORMATION.
 
IF YOU ARE IN AN AREA PRONE TO FLOODING...MOVE TO HIGHER GROUND
IMMEDIATELY...BEFORE YOUR ACCESS IS CUT OFF BY RISING FLOOD WATERS.
IF YOUR VEHICLE STALLS...ABANDON IT AND SEEK HIGHER GROUND QUICKLY.
RAPIDLY RISING WATER  MAY ENGULF THE CAR AND SWEEP IT AWAY.

NPC/HGW/MR/JM

Nearby

Flash Flood Warnings in Pennsylvania, 1997Every flash flood warning in 1997

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.