Alert archive / Pennsylvania / Flash Flood Warnings in 1996

Flash Flood Warning 35, NWS State College, PA

April 16, 1996Lancaster County, York County, Pennsylvania

NWS State College, PA issued this flash flood warning at Apr 16, 1996, 3:04 AM EDT for Lancaster County, York 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 counties it named.

The facts

Issued
Apr 16, 1996, 3:04 AM EDT (07:04 UTC)
Expired
Apr 16, 1996, 7:00 AM EDT
In force
4 hr
Issued by
NWS State College, PA
Area
Whole counties

Counties Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 141 km from the middle of the area, began a volume at 07:06 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 00:00Z, 7.1 hours before the alert went out and 139 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 00:00Z on 1996-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1996-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 601 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
442 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
601 m²/s²
0-3 km storm-relative helicity
944 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 160705
FFWCTP
PAC071-075-107-133-161100-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
304 AM EDT TUE APR 16 1996
 
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  700 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN PENNSYLVANIA
 
   ...LANCASTER COUNTY...LEBANON COUNTY...SCHUYLKILL COUNTY
   ...YORK COUNTY
 
DOPPLER RADAR CONTINUES TO SHOW RAIN...OCCASIONALLY HEAVY...MOVING
ACROSS THE AREA.  RAIN GAGES IN THESE COUNTIES INDICATE THAT BETWEEN
ONE AND TWO INCHES OF RAIN HAS ALREADY FALLEN AS OF 300 AM.
 
MORE RAIN IS MOVING NORTHWARD FROM VIRGINIA...AND WILL GIVE
LANCASTER... LEBANON... YORK AND SCHUYLKILL COUNTIES ANOTHER INCH
OR SO OF RAIN BETWEEN 300 AND 600 AM.
 
THIS RAINFALL WILL CAUSE FLOODING OF SMALL STREAMS AND CREEKS.  URBAN
AND POOR DRAINAGE AREAS WILL ALSO SEE SOME FLOODING.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS.  IF FLOODING IS OBSERVED...ACT QUICKLY.
MOVE UP TO ESCAPE FLOOD WATERS.  DO NOT STAY IN AREAS SUBJECT
TO FLOODING WHEN WATER BEGINS RISING.
 
JUNG

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 Apr 16, 2:23 AM EDT, 41 minutes earlier.

Area forecast discussion, Apr 16, 2:23 AM EDT, 41 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION... CORRECTED DATE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
200 AM EDT TUE APR 16 1996

...KCCX 88D DOWN UFN...

...PHL ZONES LOOK GOOD...
KEEP FLOOD WATCH GOING THIS MORNING AS NEXT BATCH OF RAIN IN WRN
PA WILL TRAVERSE ERN PA THIS MORN WHERE SIG RAINS HAVE FALLEN
ALREADY.
...PIT ZONES...
PIT ZONES FROM PRVS PACKAGE ALSO LOOK FINE.

...DSCN...
AREA 88D/S SHWG TWO AREAS OF PRECIP. ONE ACRS WRN PA IN A RATHER
WIDE LINEAR BAND AND THE OTHER WORKG ACRS ERN PA LOOKING MORE
CONVECTIVE IN NATURE. MOIST LO-LVL SRLY JET RIDING UP OVER A
COOLER STBL AIR MASS IN ERN PA WAS FEEDING THE RW AND RW+ ACRS
MUCH OF ERN PA INTO NJ. THIS PRECIP WAS SLOWLY SLIDING E AND
MODELS KEY ON THIS PRECIP WITH RATHER SIG UVV/S. 850 MB LLJ AND
ASSCTD UVV/S ON NGM/ETA SLIDES WELL E OF CTP FA BY 12Z. SECOND
BAND OF PRECIP OVR WRN PA WAS NOT CAPTURED WELL BY THE MODELS IN
THE UVV FIELDS (OR QPF FIELDS). THIS BAND APPEARS TO BE
ASSOCIATED WITH LO-LVL CONV AND FRONTOGENISIS NR THE SFC FRNT.
ASSCTD DESTABLIZATION ALOFT ALSO WAS LIKELY ENHANCING PRECIP AS
COOLING W/ UPR LVL S/W WORKS INTO PA. WV IMAGERY ALSO SHOWED
TREMENDOUS DVRG ACRS PA EARLY THIS MORN WHICH WAS NO DOUBT
ENHANCING BOTH PRECIP AREAS.

THIS OH/TN VLLY UPR S/W WILL PUSH FRNT SYS INTO PA THIS MORN WITH
STRG LO-LVL CONV. NGM/ETA TIGHTEN UP LO-LVL BAROCLINIC ZONE ACRS
PA AS WELL WITH A BAND OF STRG 850 MB FRONTOGENESIS ACRS THE
EXACT CNTR OF THE STATE AT F12. THIS BAND LIFTS NE AND LIES ACRS
FAR NERN PA BY 18Z. THINK BACK EDGE OF PRECIP IN WRN PA WILL
FOLLOW THIS FRNTL FRCG AND LIE FROM ABT COUDERSPORT TO UNV AND
CHAMBERSBURG BY 12Z AND OVR NE CRNR OF PA BY 18Z. BEHIND THIS
BATCH OF PRECIP INSTAB RW WILL BREAK OUT WITH VERY COLD AIR ALOFT
SETTLING ACRS ST AS UPR LVL LO CNTR IS JUST N OF PA AT 00Z.
TOT-TOTAL/S ON NGM REACH 60 IN PIT AT THE SAME TIME INDICATIVE OF
THE COLD AIR ALOFT. ALSO... WITH VERY COLD AIR ALOFT... SEE SNOW
SHOWERS OVR MTNS OF NRN/WRN PA AS 850 MB ISOTHERMS PLUNGE WELL
BLO 0C.

FOR TONIGHT... RW/SW TAPERS OFF MOST AREAS EXCEPT NRN MTNS TO
LAURELS WHERE MOIST UPSLPE NWRLY FLO CONTINUES.

WED LOOKS LIKE IMPROVING WX AS RDG WORKS TWD RGN WITH DRYING AND<
SUBSDC.

NICOSIA

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 3:04 AM EDTFlash Flood WarningCTPLebanon, Schuylkill4 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.