Severe Thunderstorm Warning 4, NWS State College, PA

CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1030 AM EST MON JAN 18 1999

...WORK ZONES OUT AT 930 AS PHLADMCTP...
...ZONES OUT BY 11 AM AS PHLZFPCTP...

UPPER LO...SEEN IN THE SATELLITE IMAGERY NEAR SOUTHERN LK
MICHIGAN...WILL PROGRESS NE TODAY. DARKENING IN WV IMAGERY OVER OHIO
VALLEY REVEALING THE VORT MAX THAT IS PROGGED TO MOVE INTO PA LATE
TODAY. REGIONAL RADAR LOOP SHOWING AN AREA OF MODERATE TO HEAVY RAIN
DEVELOPING ACROSS EASTERN OHIO IN ADVANCE OF THE SFC COLD FRONT.
RECENT LIGHTNING DATA SUGGESTING THAT THUNDER WILL BE CONFINED TO
EXTREME SE PA...WHERE INFLUX OF LL MOISTURE IS THE GREATEST. WILL
KEEP THE FFA GOING THROUGH THE AFTN BECAUSE MINOR FLOODING STILL
SEEMS LIKELY AS PRE-FRONTAL RAIN BAND MOVES THROUGH THIS AFTN. IN
FACT...SOME STREAMS IN LANCASTER CO ALREADY FLOODING IN RESPONSE TO
RAINS OVERNIGHT. ALSO...FLASH FLOOD THREAT EXISTS AS A RESULT OF
POSSIBLE ICE JAMS ALONG SMALLER RIVERS AND STREAMS. HAVE ADDED THE
CHANCE OF SNOW SHOWERS EXTREME NW FOR LATE THIS AFTN GIVEN LATEST
ETA SOUNDINGS.

.CTP...FLASH FLOOD WATCH THROUGH THIS AFTERNOON SOUTHERN HALF OF
CENTRAL PA. WILL RE-ISSUE PHLSPSCTP FOR CONVECTIVE OUTLOOK IN THE
LOWER SUSQ VALL.

FITZGERALD

PAZ036-056-057-059-063>066-182115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1106 AM EST MON JAN 18 1999

...SLIGHT RISK OF DAMAGING THUNDERSTORM WINDS THIS AFTERNOON...

A COLD FRONT WILL SWEEP EAST ACROSS PENNSYLVANIA THIS AFTERNOON. AS
THE FRONT MOVES THROUGH...IT WILL BRING A PERIOD OF RAIN...ALONG WITH
WIDELY SCATTERED THUNDERSTORMS. WINDS JUST ABOVE THE SURFACE ARE VERY
STRONG FROM THE SOUTHWEST. THEREFORE...ANY THUNDERSTORMS THAT FORM
WILL BRIEFLY BE CAPABLE OF CAUSING THESE STRONG WINDS TO DECEND TO
THE GROUND. SOME GUSTS WILL LIKELY EXCEED 40 MPH AND COULD BE
POTENTIALLY DAMAGING. ANYONE WITH PROPERTY CONCERNS THAT ARE
VULNERABLE TO HIGH WINDS SHOULD MONITOR THIS SITUATION CLOSELY.

.END/

YOU CAN FIND INFORMATION ON THE FLOOD POTENTIAL WITH THIS SYSTEM
IN THE FLASH FLOOD WATCH (PHLFFACTP) ISSUED THIS MORNING.
ADDITIONAL WEATHER INFORMATION FOR CENTRAL PENNSYLVANIA CAN BE FOUND
AT THE STATE COLLEGE NATIONAL WEATHER SERVICE WORLD WIDE WEB SITE.
THE ADDRESS IS:

HTTP://BOOKEND.MET.PSU.EDU    (ALL LOWER CASE)

FITZGERALD