Alert archive / Pennsylvania / Flash Flood Warnings in 1996

Flash Flood Warning 129, NWS State College, PA

August 9, 1996Lancaster County, Pennsylvania

NWS State College, PA issued this flash flood warning at Aug 9, 1996, 4:27 PM EDT for Lancaster 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
Aug 9, 1996, 4:27 PM EDT (20:27 UTC)
Expired
Aug 9, 1996, 6:30 PM EDT
In force
2 hr
Issued by
NWS State College, PA
Area
Whole counties

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 20:29 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.5 hours before the alert went out and 65 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, Phillips Aaf/Abe, MD at 12:00Z on 1996-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 151 joules per kilogram.LCLLFCEL10008507005003002001001 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, Phillips Aaf/Abe, MD at 12:00Z on 1996-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
151 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
870 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
94 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 KCTP 092028
FFWCTP
PAC071-092230-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
427 PM EDT FRI AUG 9 1996
 
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  630 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS......
 
IN  PENNSYLVANIA
 
   ...LANCASTER COUNTY
 
FLOODING HAS BEEN REPORTED AROUND QUARRYVILLE IN SOUTHERN LANCASTER
COUNTY.
 
BETWEEN 2 AND 4 FEET OF WATER COVERS SOME ROADS...AND TWO MUD SLIDES
HAVE BEEN REPORTED.  THE RAIN SHOULD TAPER OFF BY 530 PM...BUT
ADDITIONAL FLOODING IS LIKELY DURING THE NEXT COUPLE OF HOURS.
 
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.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
MARTIN
 
&

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at Aug 9, 2:24 PM EDT, 2 hours 3 minutes earlier.

Area forecast discussion, Aug 9, 2:24 PM EDT, 2 hours 3 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
220 PM EDT FRI AUG 9 1996

...ZONE SUGGESTIONS...
...PIT/PHL...NO SIG CHANGES.

...DISCUSSION...
FRONT FINALLY CLEARING ERN CTP ZONES WITH LAST OF THE PRECIP STILL
JUST SE OF A GETTYSBURG TO HARRISBURG LINE. SATELLITE SHOWS CLOUDS
MOVING SOUTHEAST WITH FAIR WX CU POPPING UP IN STRONG AUG SUNSHINE.
MODELS HAVE BEEN PRETTY GOOD IN DEPICTING SLOW WAVY NATURE OF FRONT
AS IT SLIDES OVER SE SXNS.

NEW GRIDDS TAKE STRONG RIGHT REAR THERMALLY DIRECT QUAD OF JET UP
INTO ERN CANADA ALLOWING FRONT TO FINALLY MEANDER EAST AND HIGH
PRESSURE TO BUILD INTO REGION. DEWPOINTS IN THE 50S UPSTREAM SHOULD
PROVIDE SOME MEASURE OF RELIEF FROM HIGH HUMIDITY THRU WEEKEND.
HOWEVER GOOD RAD COOLING AT NIGHT COULD DROP MINS NEAR DEWPOINTS
MAKING SITUATION RIPE FOR PATCHY EARLY MORNING FOG.

A LOOK UPSTREAM SHOWS LOW CLOUDS COOKING UP QUITE NICELY OVER MI/WI
WHICH CAUSES SOME CONCERN FOR AMOUNT OF SUN TMRW. LOOKING AT SFC
DEWPOINTS AND 850 TEMPS TMRW SUGGESTS SOME POTENTIAL FOR CLOUDING
UP DURG LATE MORNING EARLY AFTERNOON...MAINLY UP NORTH. STILL LOOKS
LIKE A NICE WEEKEND BEFORE NEXT WX BEGINS TO AFFECT REGION TWD MID
WEEK...WHEN MRF AND ECMWF START TO MAKE THINGS INTERESTING. BOTH
MODELS HINT AT SHORTWAVE TROF DEEPENING TWD GR LAKES AND EVENTUALLY
INTO LOCAL AREA COINCIDING WITH WARM CORE LOW LEVEL SYSTEM RIDING
WESTERN PERIPHERY OF BERMUDA HIGH UP ALONG ERN SEA BOARD.

LA CORTE

In the hours before

Special weather statement, Aug 9, 4:18 PM EDT, 9 minutes before
PAZ066-100015-

SPECIAL WEATHER STATEMENT - HEAVY RAIN
NATIONAL WEATHER SERVICE STATE COLLEGE PA
418 PM EDT FRI AUG 9 1996

...HEAVY RAIN WILL SLOWLY MOVE OUT OF LANCASTER COUNTY...

HEAVY RAIN HAS FALLEN ACROSS PORTIONS OF LANCASTER COUNTY THIS
AFTERNOON.  SHOWERS AND STORMS SHOULD MOVE EAST OF LANCASTER COUNTY
BY 530 PM.

SOME POOR DRAINAGE FLOODING AND PONDING OF WATER ON ROADS IS POSSIBLE.

MARTIN

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 6:27 PM EDTFlash Flood WarningCTPLancaster3 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.