National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KCTP 170827
AFDCTP

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
427 AM EDT THU APR 17 2014

.SYNOPSIS...
-- Changed Discussion --
THE CENTER OF HIGH PRESSURE HAS MOVED TO THE NORTH AND EAST. COLD
MORNING TEMPERATURES ARE EXPECTED AGAIN FRIDAY MORNING. THE HIGH
PRESSURE RIDGE WILL REMAIN ALONG THE EAST COAST THROUGH THE
WEEKEND. THIS SHOULD SERVE TO DEFLECT PRECIPITATION TO THE NORTH
AND TO THE SOUTH OF THE STATE. TEMPERATURES WILL MODERATE FURTHER
THIS WEEKEND AND RISE ABOVE NORMAL BY EARLY NEXT WEEK.
-- End Changed Discussion --

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
HIGH CLOUDS OVERHEAD EARLY THIS MORNING...SO TEMPS ARE NOT AS COLD
AS LAST NIGHT...BUT STILL AOB FREEZING IN MOST LOCATIONS. THE
CLOUDS MAY THIN A BIT DURING THE DAY...BUT SOME MARINE MOISTURE
COULD STILL START TO SNEAK IN AS THE FLOW AROUND THE BIG NEW
ENGLAND HIGH FETCHES THINGS FROM THE SOUTHEAST. WILL KEEP SKY
COVER SCT FOR THE MOST PART TODAY...BUT CONFIDENCE IN A TOTALLY
SUNNY DAY IS LOW WITH THE POSS OF SOME CU. THUS...MO SUNNY SHOULD
WORK OUT. MAXES SHOULD RUN CLOSE TO MOS GUIDANCE...WHICH BLENDS
NICELY TO THE L-M 50S.
-- End Changed Discussion --

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/...
-- Changed Discussion --
MOISTURE COULD BECOME THICKER AND BUILD A CEILING/BROKEN SKY OVER
THE SE EARLY TONIGHT. BUT THE FLOW FROM THE SE BACKS AND SLACKENS
AS THE SFC RIDGE SETS UP SHOP OVER THE ATLANTIC COAST. THUS...THE
MOISTURE MAY SLIDE OUT OF THE SE AND POOL UP OVER THE CENTRAL
MTNS. THIS WILL LEAD TO SOME CLEARING OVER THE AREAS IN THE
GROWING SEASON. MOS GUIDANCE AGAIN PLACES NEAR FREEZING TEMPS IN
THE SE AGAIN. CLOUDS COULD BLOW THIS UP AND KEEP IT SLIGHTLY
MILDER. HOWEVER...MESO PATTERN IS CERTAINLY ONE WHICH COULD ALLOW
FOR MOISTURE TO BE CUT OFF AND SKIES TO CLEAR. WITH UNCERTAINTY IN
THE FORECAST AND TEMPS NEAR FREEZING THE HIGHEST LIKELIHOOD
TONIGHT...WILL POST A FREEZE WATCH FOR THE TIME BEING. DAY SHIFT
WILL HAVE THE NEXT OPPORTUNITY TO CONSIDER THE POSSIBLE FREEZING.

THE RIDGE THEN STAYS IN PLACE AND HELPS TO PUSH A WEAK NORTHERN
STREAM SYSTEM TO OUR NORTH. A SIGNIFICANTLY STRONGER SRN STREAM
STORM WILL ALSO BE DEFLECTED SOUTH OF THE AREA. A FEW LIGHT
SHOWERS MAY GRAZE THE NWRN COS FRIDAY EVENING. OTHERWISE...THE
DRY WEATHER SHOULD CONTINUE FOR THE REST OF THE WEEKEND AS RIDGING
RE-ESTABLISHES ITSELF OVER THE GREAT LAKES AND SLIDES EAST TO
COVER MUCH OF THE COUNTRY EAST OF THE MIGHTY MISS.
-- End Changed Discussion --

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...
-- Changed Discussion --
LOOKING INTO THE MEDIUM RANGE...WHILE FCST CONFIDENCE IN THE PCPN
PATTERN IS AVG AT BEST THE GUIDANCE FAVORS A MAINLY DRY FCST SUN-
MON BEFORE RAIN CHANCES RETURN BY TUESDAY. THE UNCERTAINTY IS
ASSOCD WITH A LOW AMPLITUDE PACIFIC SHORTWAVE TROUGH EJECTING
EASTWARD FROM THE NORTHERN ROCKIES. THE GENERALLY WEAK NATURE OF
THE PACIFIC ENERGY CROSSING THE NORTHERN-TIER CONUS ALONG WITH A
SOMEWHAT UNUSUAL BUT RATHER EXPLICIT NORTH-SOUTH SPLIT IN THE
500MB FLOW BOTH CONTRIBUTE TO LOW CONFIDENCE IN THE FCST.

THE SPLIT FLOW ALOFT APPEARS TO BE SHORT-LIVED AS THE LW PATTERN
IS FCST TO REAMPLIFY BY THE MIDDLE OF NEXT WEEK...WITH STRONG
HEIGHT FALLS/SPRING CUT-OFF LOW PROGGED TO MIGRATE FROM THE WEST
COAST INTO THE GREAT BASIN...SUPPORTING SLIGHTLY ABOVE-AVG 500MB
RIDGING SPREADING EWD FROM THE PLAINS TO THE MIDWEST AND
EVENTUALLY INTO THE NORTHEAST TOWARD THE END OF NEXT WEEK. A
CANADIAN SHORTWAVE CROSSING NORTHERN NEW ENGLAND MAY DELAY THE
HEIGHT RISES IN THE EAST AND SEND A BACK-DOOR COLD FRONT INTO THE
MID-ATLC AROUND DAY 8.

OVERALL...EXPECT TEMPERATURES TO MODERATE FROM BELOW NORMAL TO
NEAR OR SLIGHTLY ABOVE LATE APRIL NORMALS BY NEXT WEDNESDAY.
OPPORTUNITIES FOR RAIN NOW APPEAR TO BE FOCUSED IN THE FRI NGT
SATURDAY MORNING AND TUESDAY TIME-FRAMES. SO MOST OF THE EASTER
WEEKEND LOOKS LIKE IT WILL BE MAINLY DRY IN CENTRAL PA.
-- End Changed Discussion --

&&

.AVIATION /08Z THURSDAY THROUGH MONDAY/...
VFR CONDITIONS WILL CONTINUE THROUGH THU EVE AS INFLUENCE OF HIGH
PRESSURE CENTERED TO OUR NORTH PERSISTS.

HIGH CLOUDS WILL STREAM OVERHEAD OVERNIGHT. SURFACE WINDS WILL
GENERALLY BE LIGHT...THOUGH SPEEDS MAY APPROACH 8 KTS ACROSS
WESTERN HIGHER TERRAIN AS THE NIGHT PROGRESSES. WINDS AT 850 MB
WILL BE IN THE 15-20 KT RANGE.

MAINLY SUNNY SKIES FOR THU AS SOUTHEAST WINDS INCREASE TO 8-12
KTS WITH OCCASIONAL GUSTS APPROACHING 20 KTS...BEFORE SUBSIDING
DURING THE EARLY EVENING.

OUTLOOK...
FRI...GENERALLY VFR. AREAS OF MVFR CIGS POSS ACROSS SE PA EARLY.

FRI NIGHT-SAT...REDUCED CIGS/VSBYS POSS WITH CHANCE OF LIGHT RAIN
/MAINLY NW HALF/.

SUN-MON...NO SIG WX.

&&

.CLIMATE...
-- Changed Discussion --
TEMPERATURES ARE APPROACHING RECORD MINS IN IPT AND MDT...BUT MAY
STOP SHORT GIVEN THE HIGH CLOUDS AND THE LITTLE BREATH OF WIND
REMAINING. BELOW ARE THE CURRENT RECORDS FOR APRIL 17TH FROM
AROUND THE AREA.

AOO... 23/1980
BFD... 16/1963
JST... 21/1966
IPT... 25/1904
MDT... 29/1980 AND 1904
-- End Changed Discussion --

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
FREEZE WATCH FROM LATE TONIGHT THROUGH FRIDAY MORNING FOR
PAZ057-059-063>066.
FREEZE WARNING UNTIL 8 AM EDT THIS MORNING FOR PAZ057-059-
063>066.
-- End Changed Discussion --

&&

$$
SYNOPSIS...DANGELO
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...STEINBUGL
AVIATION...CERU/RXR
CLIMATE...CTP