Alert archive / Pennsylvania / Flash Flood Warnings in 1995

Flash Flood Warning 76, NWS State College, PA

October 21, 1995Schuylkill County, Pennsylvania

NWS State College, PA issued this flash flood warning at Oct 21, 1995, 5:38 AM EDT for Schuylkill County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Oct 21, 1995, 5:38 AM EDT (09:38 UTC)
Expired
Oct 21, 1995, 9:45 AM EDT
In force
4 hr
Issued by
NWS State College, PA
Area
Whole counties

County Schuylkill County, PA

The radar

The State College radar (KCCX), 152 km from the middle of the area, began a volume at 09:40 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, 9.6 hours before the alert went out and 220 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 1995-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 294 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1995-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 248 square meters per square second.19395878Sfc1 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
294 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
248 m²/s²
0-3 km storm-relative helicity
324 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCTP 210940
FFWCTP
PAC107-211345-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
538 AM EDT SAT OCT 21 1995
 
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  945 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS......
 
IN  PENNSYLVANIA
 
   ...SCHUYLKILL COUNTY
 
AT 540 AM EDT... DOPPLER RADAR FROM STATE COLLEGE SHOWED HEAVY RAINS
CONTINUING TO PELT SCHUYLKILL COUNTY. BETWEEN 2 AND 3.5 INCHES OF RAIN
HAS FALLEN IN SCHUYLKILL COUNTY SINCE LAST EVENING WITH MORE HEAVY
RAINS TO CONTINUE THROUGH 7 AM.
 
THE RAINS WILL CAUSE FLOODING IN POOR DRAINAGE AREAS AND PONDING OF
ROADWAYS.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS.  IF FLOODING IS OBSERVED...ACT QUICKLY.
WATCH FOR PONDING OF WATER ON ROADWAYS THAT MAY BE HARD TO SEE IN THE
DARK.
 
NICOSIA

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 Oct 21, 2:37 AM EDT, 3 hours 1 minute earlier.

Area forecast discussion, Oct 21, 2:37 AM EDT, 3 hours 1 minute before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
235 AM EDT SAT OCT 21 1995

STRONG COLD FRONT FROM IPT SOUTH TO JUST WEST OF MDT AT 2AM.
LARGE AREA OF HEAVY RAIN OVER CNTRL PA AT THIS TIME IN RESPONSE
TO STRONG FRONTOGENETIC FORCING. NOSE OF 55+ KT LOW LEVEL JET NOW
PUSHING INTO SRN NY WITH CTRL PA IN LEFT ENTRANCE REGION OF LL
JET. STRONG AGEOSTROPHIC COMPONENT OF FLOW ACROSS LLJ MAKING FOR
INTENSE LOW LEVEL WIND AND MOISTURE CONVERGENCE OVER AREA. THIS
SITS NICELY UNDER STRONG DIVERGENCE ALOFT COURTESY OF NEGATIVE
TILT TROF AND STRONG EVACUATION OCCURRING DUE TO JET SPLITTING AS
IT MAKES TURN THRU TROF BASE. MARGINAL INSTABILITY CAUSING
EMBEDDED CONVECTION WHICH ISN'T HURTING SYSTEM'S PRECIP MAKING
ABILITY...SEEN SEVERAL FLASHES OF LTG OUT WINDOW HERE AT CTP.
EARLIER CONCERN WAS FOR POSSIBILITY OF SYSTEM TAPPING STRONG
WINDS JUST ABOVE BOUNDARY LAYER AND MIXING THEM DOWN IN
CONVECTION BUT THIS DOESN'T SEEM TO BE HAPPENING. INITIAL GUSTY
WINDS WITH FRONT HAVE CALMED DOWN SOMEWHAT AS WELL.

HAD 2.5" OF RAIN HERE AT CTP. RADAR INDICATING 3.9" IN ELK CTY.
CORRELATION BETWEEN RADAR AND GAGES KIND OF ERRATIC. SOME RADARA
ESTIMATES SEEM PRETTY CLOSE TO GAGES BUT OTHERS SHOWING BIG
DISCREPANCIES. WOULD THINK A SYSTEM LIKE THIS WOULD BE
UNDERCOOKED A BIT.

LA CORTE

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 20, 8:33 PM EDTSevere Thunderstorm WarningCTPClearfield, Elk57 min
Oct 21, 1:27 AM EDTFlash Flood WarningCTPClearfield, Elk4 hr
Oct 21, 4:22 AM EDTFlash Flood WarningCTPCentre, Clinton4 hr
Oct 21, 4:28 AM EDTFlash Flood WarningCTPLancaster, Lebanon, York4 hr
Oct 21, 4:34 AM EDTFlash Flood WarningCTPFranklin, Fulton, Huntingdon, Juniata, Mifflin4 hr
Oct 21, 4:40 AM EDTFlash Flood WarningCTPCameron, Potter4 hr
Oct 21, 4:40 AM EDTFlash Flood WarningCTPLycoming, Tioga4 hr
Oct 21, 4:55 AM EDTFlash Flood WarningCTPBlair4 hr
Oct 21, 5:11 AM EDTFlash Flood WarningCTPSnyder, Union4 hr
Oct 21, 6:09 AM EDTFlash Flood WarningCTPAdams, Cumberland4 hr
Oct 21, 6:09 AM EDTFlash Flood WarningCTPDauphin, Perry4 hr
Oct 21, 6:15 AM EDTFlash Flood WarningCTPColumbia, Sullivan4 hr
Oct 21, 6:15 AM EDTFlash Flood WarningCTPMontour, Northumberland4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1995Every flash flood warning in 1995

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.