Area Forecast Discussion
Issued by NWS State College, PA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS61 KCTP 230321
AFDCTP

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1121 PM EDT FRI AUG 22 2014

.SYNOPSIS...
UPPER RIDGING WILL SLOWLY BUILD OVER THE REGION BY LATE SATURDAY
AND SUNDAY...BRINGING AN END TO THE RECENT SIEGE OF SHOWER AND
THUNDERSTORM ACTIVITY. THE UPPER RIDGE WILL DOMINATE THE WEATHER
PATTERN OVER THE NORTHEAST UNITED STATES AND SOUTHEASTERN CANADA
FROM THE EARLY TO MIDDLE OF NEXT WEEK...WITH THE NEXT CHANCE OF
RAINFALL POSSIBLE LATE WEDNESDAY OR THURSDAY FROM AN APPROACHING
MIDWESTERN FRONTAL SYSTEM.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
RADAR LOOP AT 02Z CONTINUES TO SHOW SCT SHRA IN MARGINALLY
UNSTABLE AIR MASS ALONG WEAK SFC TROUGH PUSHING INTO THE CENTRAL
MTNS AND ALSO ALONG BACKDOOR COLD FRONT ENTERING THE SUSQ VALLEY.
CONVECTION IS ALSO BEING SUPPORTED BY WEAK SHORTWAVE APPROACHING
FROM S ONTARIO. EXPECT DYING SCT CONVECTION TO BECOME FOCUSED OVR
THE CENTRAL MTNS OVERNIGHT...AS REMAINING SECTOR OF MARGINAL
INSTABILITY IS PINCHED OFF FROM THE NORTH AND BY BACKDOOR FRONT
APPROACHING FROM THE SUSQ VALLEY.

TOWARDS DAWN...MOIST EASTERLY FLOW ASCENDING THE HIGHER TERRAIN
OF CENTRAL PA WILL LIKELY RESULT IN DEVELOPING LOW CLOUDS AND
PATCHY DRIZZLE ACROSS THE CENTRAL MTNS. TEMPS WILL REMAIN MILD
UNDER CLOUD COVER...WITH LOWS GENERALLY IN THE LOWER TO MIDDLE 60S

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...
EXPECT ONE MORE MOIST DAY IS IN STORE FOR SATURDAY...WITH ONSHORE
FLOW AND SLOWLY DEPARTING UPPER TROF ALONG THE NORTHERN MID
ATLANTIC SEABOARD COMBINING TO PRODUCE ADDITIONAL SHOWER ACTIVITY.
WIDESPREAD LOW CLOUDS AND PATCHY MORNING DRIZZLE AND FOG MAY
PERSIST WELL INTO SAT AFTERNOON...KEEPING TEMPS WELL BELOW NORMAL
ON SATURDAY. PORTIONS OF THE CENTRAL/NRN MTNS MAY STRUGGLE TO
CLIMB OUT OF THE UPPER 60S. FAR NORTHWEST SECTIONS...AWAY FROM
THE MARITIME FLOW AND IN DOWNSLOPE FLOW...MAY WARM INTO THE 70S.
THE RESULTING INSTABILITY COULD POTENTIALLY RESULT IN A PM TSRA
ACROSS WARREN CO.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
MUCH OF THE EXTENDED WILL FEATURE A RIDGE DOMINATING THE PATTERN
OVER THE EASTERN AND NORTHEASTERN US.

THE LINGERING EFFECTS OF THE TROUGH OVER THE NERN US SLIDING EAST
MAY KEEP A FEW SHOWERS IN THE PICTURE SATURDAY NIGHT...OTHERWISE
FAIR WEATHER WILL DEVELOP ALONG WITH WARMING TEMPERATURES AS THE
RIDGE ESTABLISHES ITSELF AND MAINTAINS ITS HOLD UNTIL AT LEAST
THURSDAY WHEN THE NEXT FRONTAL SYSTEM IS ADVERTISED TO
APPROACH...ALBEIT IN DIFFERENT FASHIONS BY THE VARIOUS MED RANGE
GUIDANCE PACKAGES.

THE OPERATIONAL GFS AND ECMWF KEEP US DRY THROUGH AT LEAST LATER
WEDNESDAY WHILE THE GEFS IS MORE PESSIMISTIC BRINGING MEASURABLE
RAINS EAST QUICKER UNDER A FLATTER UPPER FLOW. THE GEFS UPPER
PATTERN MORE CLOSELY RESEMBLES THE OPERATIONAL ECMWF SHOWING A
WEAKER TROUGH HANGING BACK IN THE MID WEST AS HEIGHTS IN THE EAST
SLOWLY FALL WITH THE EAST COAST RIDGE FLATTENING OUT IN TIME.

THE DIFFERENCES ARE AT THE END OF THE FORECAST PERIOD THROWING
DOUBT ON THE FORECAST SO I OPTED FOR A RATHER BLAND CHANCE OF
SHOWERS STARTING WEDNESDAY NIGHT LASTING INTO THURSDAY NIGHT.

OVERALL THE LAST FULL WEEK OF AUGUST WILL BE A SUMMERY ONE FOR
THE FIRST DAYS OF SCHOOL IN MANY COMMUNITIES. TEMPS WILL BE NEAR
TO A BIT ABOVE NORMAL MONDAY...THEN WILL REMAIN ABOVE NORMAL AT
LEAST THROUGH THE END OF THE WEEK WHEN THE AIRMASS SITUATION
BECOMES A LITTLE LESS CERTAIN.

&&

.AVIATION /03Z SATURDAY THROUGH WEDNESDAY/...
STILL A FEW STORMS NEAR JST.

ANOTHER BATCH FROM NEAR IPT...SOUTHWARD ACROSS SEG...TO NEAR MDT.

03Z TAFS WILL BE ADJUSTED FOR THIS.

EARLIER DISCUSSION BELOW.

AS WAS THE CASE YESTERDAY...THERE IS 2 AREAS OF STORMS. ONE ACROSS
THE SOUTH...AND ONE ACROSS THE NORTH. THE STRONGEST STORMS ARE
ACROSS THE NORTH...WHERE THERE HAS BEEN MORE CLEARING TODAY.

CAN SEE THE STRONGEST STORMS OUT THE WINDOW HERE.

ANYWAY...21Z TAF PACKAGE UPDATED. DID ONE AT A TIME...GIVEN TYPE
OF CONDITIONS PRESENT...INSTEAD OF SENDING ALL AS A GROUG AT
520 PM.

SHOWERS ARE MOST NUMEROUS ACROSS THE CENTRAL... WEST CENTRAL
MOUNTAINS AND SOUTH CENTRAL MOUNTAINS AT MIDDAY AND EARLY THIS
AFTERNOON...ALONG WITH ISOLATED EMBEDDED THUNDER. BRIEF TSTM VSBY
AND CIG IMPACTS ARE POSSIBLE THROUGH LATE AFTERNOON...AND ANY
LINGERING STORMS SHOULD DECREASE IN COVERAGE AND INTENSITY INTO
TONIGHT.

A LARGE AREA OF HIGH PRES WILL BUILD SWWD FROM ERN CANADA INTO THE
NORTHEAST AND DOWN THE EAST SIDE OF THE APPLCHNS TNGT THRU THE
WEEKEND. EASTERLY FLOW SHOULD BRING LOW CLOUDS/CIGS INTO THE FCST
WITH SOME LIGHT RA/DZ EARLY SATURDAY WITH A FEW SHOWERS POSSIBLE
LATER IN THE DAY. LOOK FOR IMPROVING CONDS SUN THRU TUE.

OUTLOOK...
SUN...LOW CIGS PSBL EARLY THEN BCMG VFR.
MON-WED...VFR NO SIG WX.

&&

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

&&

$$
SYNOPSIS...FITZGERALD/LAMBERT
NEAR TERM...FITZGERALD
SHORT TERM...FITZGERALD/LAMBERT
LONG TERM...LA CORTE
AVIATION...DEVOIR/MARTIN/STEINBUGL


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.