Severe Thunderstorm Warning 4, NWS State College, PA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
833 PM EDT MON APR 23 2007

.SYNOPSIS...
COLD FRONT NEARING FROM THE UPPER GREAT LAKES WILL PASS LATER
TONIGHT. THIS WILL USHER IN MORE SEASONABLE CONDITIONS FOR TUESDAY.
RAINY AND COOL WEATHER APPEARS LIKELY FOR THE MIDDLE OF THIS
WEEK...AND PERHAPS INTO FRIDAY AS A SERIES OF LOW PRESSURE
SYSTEMS PASS TO THE SOUTH OF PENNSYLVANIA.

&&

.NEAR TERM /UNTIL 10 PM THIS EVENING/...
DIURNAL CU NOW EVIDENT LOCALLY AND ALMOST BROKEN OR EVEN OVERCAST
OVER WRN PA. CURRENT VIRGA AND PERHAPS SOME SPRINKLES WITH PRE-
FRONTAL TROF OVER NE OH WILL NOT BE NOTICEABLE AT THE SFC AS THEY
RIDE INTO THE DRIER AIR IN PA LATE THIS AFTN AND EVENING.
HOWEVER...THE SOUNDINGS CONTINUE TO BECOME LESS STABLE THROUGH
TIME AND WILL NEAR ZERO LI/S THIS EVENING AS LL JET DRAWS
INCREASING MOISTURE INTO THE REGION DIRECTLY IN ADVANCE OF THE
FRONT.

THUS...WILL KEEP THE MENTION A SLGHT CHC OF THUNDER IN THE NW. HAVE
FURTHER REFINED TIMING USING LOCAL WRF12 PROG...BUT MOST SHRA
SHOULD WILL STAY IN THE NW COUNTIES UNTIL AFTER 9 OR 10 PM. CAPES
THIN /300-500J/KG/ AND BEST FORCING NOT COINCIDENT WITH BEST
HEATING TIME. SHOWERS MAY CLIMB TO 15-20KFT IN THE NW/WRN
AREAS...BUT SHOULD BE SHORTER OVER THE REST OF THE REGION. THESE
TOPS ARE BARELY TALL ENOUGH TO MAKE THUNDER ON A DAY LIKE TODAY.
FZG LEVEL IS OVER 10KFT...AND BEST GLACIATION SHOULD NOT OCCUR
UNTIL WELL ABOVE THAT LEVEL. CURRENT MAXES FOR THE DAY ARE BEING
NEARED...AND HAVE TWEAKED THEM UP A DEG OR TWO. RH/S LOWER THAN
MDLS SUGGESTED YESTERDAY...AS IS NORMALLY THE CASE UNDER WARM
ADVECTION...AND DURING THE MIDDLE OF THE DAY WITH GOOD MIXING.

&&

.SHORT TERM /10 PM THIS EVENING THROUGH WEDNESDAY/...
COLD FRONT WILL PUSH INTO THE NW THIS EVENING...AND PASS THROUGH
THE CWA BY LATE TONIGHT...ACCOMPANIED BY A ROUND OF SHOWERS. ENSEMBLE
DATA CONTINUES TO SUGGEST THAT THIS WILL BE A LIGHT PRECIP
EVENT...CONFINED MAINLY TO THE NORTHERN AND WESTERN PA...AS
DOWNSLOPING SUBSIDENCE RESULTS IN ONLY WDLY SCT -SHRA FURTHER EAST
ACROSS THE SUSQ VALLEY. SREF DATA SUPPORTS LIKELY POPS OVR THE
MTNS...TO SLGHT CHC OVR THE LOWER SUSQ VALLEY. WILL HOLD MINS AS
IS...CLOSE TO ENS MOS GUID.

CLOUDS AND A FEW SHOWERS WILL LIKELY LINGER OVER SOUTHERN PA ON
TUESDAY...AS FRONT STALLS NR THE MASON DIXON LINE. PTSUNNY SKIES
LIKELY ACROSS THE NORTH...AS SFC RIDGE/DRIER AIR TRY TO BUILD
SOUTHWRD FROM ONTARIO. WILL CONFINE HIGHEST POPS OF AROUND 30
PERCENT TO AREAS SOUTH OF THE TURNPIKE...AND MAINLY DURING THE
MORNING. TEMPS SHOULD STILL BE SEASONABLE OR EVEN MILDER THAN
NORMALS.

TUE NIGHT LOOKS MAINLY DRY...BUT SOME LIGHT OVERRUNNING PRECIP
WILL TRY TO ADVANCE IN FROM THE WEST LATE AT NIGHT...SO WILL KEEP
A 30 POP OVER THE WEST FOR THAT POSSIBILITY. LOOKS LIKE THE BEST
RAIN WOULD WAIT UNTIL AFTER SUNRISE WED.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
UPPER LOW NOW OVER THE SOUTHWESTERN U.S. IS FORECAST TO MOVE SLOWLY
EAST AND AFFECT PENNSYLVANIA FOR THE FIRST HALF OF THE LONG TERM PERIOD. IT
WILL TAKE A COUPLE OF DAYS FOR THE LOW TO TRAVERSE THE CENTRAL U.S
AS IT MEANDERS EAST...CAUGHT IN A SPLIT FLOW PATTERN...AND THEN A
COUPLE DAYS TO MOVE THROUGH OUR REGION.

RAIN WILL OVERSPREAD THE STATE WEDNESDAY AND THE POSSIBILITY OF
SHOWERS WILL CONTINUE INTO AT LEAST FRIDAY...MAYBE EVEN EARLY
SATURDAY UNTIL THE UPPER LOW IS FINALLY PUSHED OUT OF THE REGION BY
AN UPPER RIDGE AMPLIFYING OVER THE CENTRAL U.S.  THE RAINY AND
CLOUDY WEATHER WILL BRING MAX TEMPERATURES BACK TO NEAR NORMAL AND
THE DAILY MINS SEVERAL DEGREES ABOVE NORMAL THROUGH FRIDAY. BOTH
MINS AND MAXES WILL RETURN TO ABOVE NORMAL BY MONDAY AHEAD OF
ANOTHER POSSIBLE FRONTAL PASSAGE.

&&

.AVIATION /01Z TUESDAY THROUGH SATURDAY/...
SHOWERS AND THUNDERSTORMS MOVING ACROSS NORTHWESTERN PA AT THIS
TIME. THESE SHOULD DIMINISH AS THE SUN SETS AND THE AREA MOVES
INTO VERY DRY AIR. HOWEVER...KBFD WILL SEE SOME HEAVY RAIN BUT
ONLY MVFR CEILINGS. KJST MAY ALSO SEE HEAVIER SHOWERS AFTER 02Z.
THE LINE OF TSRA WILL PASS ANY ONE LOCATION IN ONLY ONE HOURS
TIME.

TIMED SHOWERS TO MOVE WEST TO EAST OVERNIGHT AND BROUGHT
CONDITIONS BACK UP TO VFR AFT 15Z/TUE. WINDS WILL SHIFT TO 310-330
AROUND 12Z IN ALL LOCATIONS.

LOOKING FURTHER OUT...ANOTHER SYSTEM FOR WEDNESDAY INTO THURSDAY
WILL BRING A GOOD CHANCE FOR WIDESPREAD RAIN/SHOWERS. CONDITIONS
WILL BE MAINLY VFR THROUGH TUESDAY NIGHT...THEN OCCASIONAL MVFR
CONDITIONS WILL BE AROUND DURING THE MIDWEEK.

&&

.FIRE WEATHER...
RAIN IS MOVING WEST TO EAST ACROSS THE FORECAST AREA AND
HUMIDITIES HAVE INCREASED ABOVE 40 PERCENT. WINDS HAVE DIMINISHED
TO LESS THAN 10 KTS OVER THE EAST SO HAVE ALLOWED RED FLAG TO
EXPIRE.

THE SHOWERS AND THUNDERSTORMS ACCOMPANYING A COLD FRONT THIS
EVENING AND EARLY TONIGHT WILL NOT LAST ALL THE WAY DOWN INTO THE
EASTERN COUNTIES AS THE MOISTURE SOURCE IS VERY LIMITED.

A SOAKING RAIN IS LIKELY OVER MUCH OF THE REGION ON
WEDNESDAY...WITH ADDITIONAL SHOWERS POSSIBLE INTO FRIDAY.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

SYNOPSIS...DANGELO/FITZGERALD
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...GARTNER
AVIATION...DANGELO/TYBURSKI
FIRE WEATHER...TYBURSKI

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
449 AM EDT MON APR 23 2007

PAZ004>006-010-011-017-024-033-240900-
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
449 AM EDT MON APR 23 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT

SOUTHWEST WINDS INCREASING TO BETWEEN 15 AND 20 MPH...COMBINED
WITH THE RECENT SPELL OF DRY WEATHER...WILL CREATE AN INCREASED
RISK OF WILDFIRES TODAY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ012-018-019-025>028-034>037-041-042-045-046-049>053-056>059-
063>066-240900-
NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON-
MIFFLIN-JUNIATA-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-
ADAMS-YORK-LANCASTER-
449 AM EDT MON APR 23 2007

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM EDT
THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   RED FLAG WARNING

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
705 PM EDT MON APR 23 2007

PAZ004-005-240000-
MCKEAN-WARREN-
705 PM EDT MON APR 23 2007

...A STRONG THUNDERSTORM WILL AFFECT MCKEAN AND WARREN COUNTIES...

AT 700 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 19 MILES SOUTHWEST OF JAMESTOWN...MOVING EAST AT
35 MPH. THE THUNDERSTORM WILL BE NEAR LOTTSVILLE...YOUNGSVILLE AROUND
715 PM...WARREN...RUSSELL AROUND 730 PM...KINZUA DAM...CLARENDON
AROUND 745 PM...LUDLOW AND WESTLINE AROUND 800 PM.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...ROUTE
62...STATE ROAD 59.

WIND GUSTS TO 40 MPH AND FREQUENT LIGHTNING ARE POSSIBLE WITH THIS
STORM.

FORECASTER:DEVOIR/CONNELLY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
825 PM EDT MON APR 23 2007

PAZ010-240130-
ELK-
825 PM EDT MON APR 23 2007

...A STRONG THUNDERSTORM WILL AFFECT ELK COUNTY...

AT 820 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 18 MILES NORTH OF BROOKVILLE...MOVING EAST AT 40
MPH. THE THUNDERSTORM WILL BE NEAR JAMES CITY AROUND 830 PM...BRANDY
CAMP...PORTLAND MILLS AROUND 845 PM AND EAST BRANCH DAM AROUND 900
PM. ANOTHER STRONG THUNDERSTORM WAS DROPPING INTO NORTHERN PORTIONS
OF ELK COUNTY AND WILL AFFECT JAMES CITY AND WILCOX BETWEEN 830 PM
AND 900 PM.

THESE STORMS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE
219...STATE ROAD 66.

VERY HEAVY RAIN WILL FALL...CAUSING SOME PONDING OF WATER ON
ROADWAYS. WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM.

FORECASTER:DEVOIR