Flash Flood Warning 39, NWS State College, PA

Issued

Aug 20, 1999, 5:15 PM EDT (21:15 UTC)

Expired

Aug 20, 1999, 10:00 PM EDT

In force

5 hr

Issued by

NWS State College, PA

Area

Whole counties

Counties Juniata County, PA, Snyder County, PA

000 
TTAA00 KCTP 202125
FFWCTP
PAC067-109-119-210200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
515 PM EDT FRI AUG 20 1999

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SNYDER COUNTY.
  JUNIATA COUNTY.
  UNION COUNTY.

* UNTIL 1000 PM EDT.

THUNDERSTORMS HAVE PRODUCED WIDESPREAD RAIN AMOUNTS OF 3 TO 6 INCHES 
OVER UNION...SNYDER...AND NORTHERN JUNIATA COUNTIES. THE HARDEST HIT 
AREA WAS EXTREME NORTHEAST JUNIATA COUNTY NEAR SEVEN STARS WHERE 
OVER 8 INCHES OF RAIN WAS ESTIMATED TO HAVE FALLEN. 

RUNOFF FROM THIS HEAVY RAINFALL WILL CONTINUE TO CAUSE FLASH 
FLOODING IN THE WARNED AREA. MORE SHOWERS AND THUNDERSTORMS ARE 
EXPECTED TO MOVE INTO THE AREA OVER THEN NEXT COUPLE HOURS AND WILL 
CAUSE ADDITIONAL FLOODING PROBLEMS.

IN JUNIATA COUNTY NUMEROUS ROADS CONTINUE TO BE FLOODED IN THE 
NORTHERN PART OF THE COUNTY. THERE HAVE BEEN WATER RESCUES IN THIS 
AREA AS WELL.

IN UNION COUNTY LITTLE BUFFALO CREEK AND BULL RUN CONTINUE TO BE OUT 
THEIR BANKS CAUSING ROAD CLOSURES. IN LEWISBURG UP TO 4 FEET OF 
WATER HAS BEEN REPORTED ON ROADS WITH APPROXIMATELY 8 ROADS CLOSED 
IN TOWN. ELSEWHERE IN THE COUNTY THERE WERE STILL SCATTERED REPORTS 
OF ROAD CLOSURES.

IN SNYDER COUNTY THERE WERE REPORTS OF AT LEAST 8 ROAD CLOSURES DUE 
TO FLOODING. 

THE HEAVY RAIN THAT HAS FALLEN...AND THE FORMATION OF ADDITIONAL 
THUNDERSTORMS IS INCREASING THE SERIOUSNESS OF THIS SITUATION. BE 
PREPARED TO TAKE QUICK ACTION IF FLOODING BECOMES MORE DANGEROUS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.

.END/ ONDREJIK/NICOSIA/SKEEN

&

NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at Aug 20, 1:45 PM EDT, 3 hours 30 minutes earlier.

CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
145 PM EDT FRI AUG 20 1999

BUSY MORNING...AS PV LOBE MET UP W/AREA OF OROGRAPHIC ENHANCEMENT TO
CONTINUALLY REGENERATE TSRA W/BIG PCPN NUMS OV MID SUSQ VLY. WE GOT
OUR SERVICE HYDROLOGISTS/ FEET WET TODAY...AS THE DROUGHT HAS
PRECLUDED ANY FLOODING PROBLEMS AS OF LATE. RDR TRENDS CONT TO DEVLP
SHRA/TSRA OV CENT PA (ESP JUST TO S OF STC ON TUSSEY MTN)... AND
PUSHING MOD RAFL INTO NE PA ATTM.

ALL MDLS COMING TOGETHER ON THE OPEN WAVE SCENARIO...FINALLY. AXIS
OF HEAVIEST PCPN TO FALL IN NW/SE ORIENTED LINE JUST TO N AND E OF
AREAS W/PROBLEMS NOW. UGH. THE PIVOT OF BIG TIME QPFS ON MOST OF THE
MDLS RIGHT OV THAT REGION...AND THUS...FFA MAY BE NEEDED FOR TONIGHT
INTO SAT. STORM MOTION VECTORS CONT TO BE VERY SLIGHT TO THE N&E.
PWS WL RIDE NEAR 2...BUT POSSIBLE TROPICAL CONNECTION NOT ACCOUNTED
FOR IN THIS CALC. SPC JUST PERKED UP TO THESE SLOW MOVERS...HPC
MENTIONED IT YSTDY IN PERSONAL CONVERSATION - GOOD DEAL NCEP  WL
HOLD THE FFA JUST N OF MDT AT THIS TIME...BUT INCLUDE UNV AND BFD-
WHERE MUCHO WATER HAS ALREADY FALLEN.

SINCE MDLS ARE COMING TOGETHER...RIGHT NOW...OVER ME...I WL ROLL
WITH THE FLOW. TAPERING POPS IN OUR SWRN COS AND KEEPING MENTION OF
TORRENTIAL DOWNPOURS IN PLACES FM UNV N&E. WON/T GET TOO WORDY WITH
DETAILS OF FCST NOW OTHER THAN TO SAY THINGS LOOK TO TAPER OFF W/
ONLY WRAP AROUND LEFT BY SAT NITE. XTNDD THOUGHTS: PUT IN MENTION OF
SHRA ON MON...AND LEAVE TUE/WED AS FAIR WORDINGS.

WORK ZONE WIBIS BY 330 PM...AS TIME IS TIGHT THIS AFTN.

.CTP...FFA TONGIGHT AND SAT FOR NRN MTNS AND MID/UPR SUSQ VLYS.

DANGELO

Flash Flood Warnings in Pennsylvania, 1999Every flash flood warning in 1999

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.