-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KCTP 082110
AFDCTP

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
410 PM EST SAT MAR 8 2014

.SYNOPSIS...
A WEAK COLD FRONT WILL PUSH SOUTHEAST FROM THE UPPER OHIO VALLEY
AND LOWER GREAT LAKES ACROSS PENNSYLVANIA TONIGHT. HIGH PRESSURE
WILL BUILD INTO THE AREA ON SUNDAY...FOLLOWED BY NORTHWEST FLOW
WITH A SERIES OF CLIPPER SYSTEMS PASSING TO THE NORTH EARLY NEXT
WEEK. A LATE-WINTER STORM SYSTEM WILL LIKELY IMPACT THE AREA
WEDNESDAY INTO THURSDAY.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
H5 TROUGH MOVG ESEWD FROM THE GREAT LKS WILL CONTINUE TO PRESS A
COLD FRONTAL BAND/LLVL THERMAL RIBBON SEWD ACRS THE AREA TGNT.
LGT SNOW HAS REMAIN CONFINED OVER THE NW MTNS/N OF I-80. STILL
EXPECT THE HIGHEST POPS TO BE ACRS WRN PA INTO THE ALLEGHENY FRONT
AND LAUREL HIGHLANDS GIVEN TERRAIN ENHANCEMENT. THE LATEST 12Z
HIRES AND OPERATIONAL MODELS SUPPORT THIS IDEA. DOWNSLOPE E OF THE
MTNS SHOULD LIMIT PCPN FROM THE CNTRL RIDGE/VALLEY REGION INTO THE
MID AND LWR SUSQ VLY. SOME MINOR ACCUMS ARE POSSIBLE ESPECIALLY
OVERNIGHT...BUT TEMPS REMAIN MARGINAL ESPECIALLY AFTER A VERY MILD
AFTN IN MOST AREAS /OUTSIDE OF THE NW MTNS./ SPEAKING OF
MILD...MID AFTN TEMPS HAVE SURGED INTO THE UPPER 40S TO MID 50S
ACRS THE S-CNTRL MTNS INTO THE MID- SUSQ VLY. EXPECT THE LGT PCPN
TO SHIFT SOUTH OF THE PA/MD BORDER OR DISSIPATE INTO EARLY SUNDAY
AS HIGH PRES RIDGES EWD FROM THE OHIO VALLEY. INCR MIN TEMPS A FEW
DEGS OVER CNTRL AND SRN AREAS GIVEN CLOUD COVER AND PERSISTENT
5-10KT WNW WINDS.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/...
COULD SEE SOME LOW CLOUDS HANGING TOUGH OVER THE LAURELS IN THE
MORNING..AS MSTR ASCENDING THE HIER ELEVATIONS VIA WK UPSLOPE
GETS TRAPPED UNDER SUBSIDENCE INVERSION. HOWEVER EXPECT A DRY BUT
COLDER DAY OVERALL WITH INC MID-HIGH CLOUDS LATER SUN INTO SUN
NGT DUE TO LOW-MID LVL WARM AIR/THETAE ADV CROSSING THE GRT LKS IN
ADVANCE OF CLIPPER SYSTEM APPROACHING THE UPPER GRT LKS.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
FRONTAL BOUNDARY SAGS SOUTHWARD MON INTO TUE AS A CLIPPER SYSTEM
IN NORTHERN STREAM SLIDES EASTWARD JUST NORTH OF THE CANADIAN
BORDER. MOISTURE AND DYNAMICS NOT VERY IMPRESSIVE...BUT ENOUGH TO
ADD LOW POPS TO MAINLY NORTHERN COUNTIES FOR EARLY WEEK. TEMPS
ACTUALLY RISE AS THIS SYSTEM SLIDES BY WITH WESTERLY FLOW
ADVECTING IN WARMER TEMPS FROM THE MIDWEST.

MIDWEEK STILL LOOKING UNSETTLED AS A CUTOFF LOW OVER TEXAS ON
MONDAY GETS ABSORBED INTO SHARPENING TROUGH PUSHING TOWARD THE
EAST COAST. ECMWF AND GFS SUITES STILL INDICATE A GRADUALLY
DEEPENING SURFACE LOW TO TRACK EASTWARD ACROSS MID ATLANTIC REGION
/BEFORE MORE IMPRESSIVE DEEPENING AS IT SLIDES OFF THE EAST
COAST/. EC STILL DEVELOPING A DEEPER TROUGH...WHICH RESULTS IN A
MORE IMPRESSIVE SURFACE WAVE. THE GFS IS WEAKER...FLATTER AND A
BIT FASTER.

IF THE ECMWF/GEFS SOLUTIONS END UP VERIFYING...HEAVIEST PRECIP
OCCURS DURING THE DAY ON WED...WITH WARMEST 850MB TEMPS...
SUGGESTING THIS COULD BE PRIMARILY A RAIN EVENT ACROSS SOUTHEAST
COUNTIES WITH A WINTRY MIX FURTHER NORTH AND WEST...ESPECIALLY
LATER IN THE EVENT WED NIGHT INTO THU AS COLDER AIR GETS DRAGGED
DOWN FROM THE NORTH. BUT PRECIP RATES LIGHTEN UP CONSIDERABLY BY
THEN.

NORTHERN STREAM DRIVES COLDER AIR INTO PA ON THU...BRINGING THE
CHILLIEST DAY OF THE WEEK AS 850 MB TEMPS DROP BELOW -15C WITH A
NOTICABLE BREEZE. HIGHS WILL BE 10-15F BELOW NORMAL...AND LIKELY
FEEL EVEN CHILLIER.

COLD SPELL WILL BE SHORT-LIVED THOUGH AS WARM ADVECTION BRINGS
MODERATING TEMPERATURES FOR FRIDAY INTO THE WEEKEND. SAT AND SUN
COULD SEE TEMPS SLIGHTLY ABOVE NORMAL IF PERSISTENT TROUGH OVER
THE EASTERN HALF OF COUNTRY FLATTENS A BIT AS PROGGED. BUT NO
LARGE-SCALE WARM UP IS ON THE HORIZON JUST YET.

&&

.AVIATION /21Z SATURDAY THROUGH THURSDAY/...
08/18Z..MVFR-IFR CIGS WILL IMPACT BFD INTO TNGT ALONG WITH A BAND
OF -SN IN ASSOC WITH A WEAK COLD FRONT PUSHING SWD FROM THE LWR
LKS. DOWNSLOPING W-NW FLOW WILL MAINTAIN HIGHER VFR CLOUD BASES
ACRS CNTRL AND SERN TAFS INTO THE EVE...BEFORE TRENDING LOWER
OVERNIGHT. SOME LIGHT RA OR SNOW IS PSBL ALONG THE FRONT AS IT
DROPS SWD...BUT VISBY RESTRICTIONS SHOULD STAY AOA MVFR RANGE.
HIGHEST CONFIDENCE IN IFR IS AT JST OVERNIGHT GIVEN THE PATTERN
BUT KEPT CIGS AT 010 FOR NOW. THE LOW CIGS SHOULD LAST INTO EARLY
SUN MORNING BEFORE GIVING WAY TO VFR...AS HIGH PRES BUILDS INTO
THE REGION.

OUTLOOK...
MON...LOW CIGS -RA/SN SHOWERS PSBL NRN TIER.
TUE...LOW CIGS PSBL EARLY. RAIN/SNOW/REDUCED CIGS PSBL TUE NGT.
WED...RESTRICTIONS LKLY IN RAIN/SNOW.

&&

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

&&

$$
SYNOPSIS...STEINBUGL
NEAR TERM...STEINBUGL
SHORT TERM...STEINBUGL
LONG TERM...LA CORTE/RXR
AVIATION...STEINBUGL