Severe Thunderstorm Warning 314, NWS Binghamton, NY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
333 PM EDT THU SEP 27 2007

.SYNOPSIS...
PERIODS OF RAIN AND THUNDERSTORMS WILL BE COMMON OVER THE REGION
FOR MUCH OF TONIGHT AS A COLD FRONT MOVES FROM WESTERN NEW YORK INTO
NEW ENGLAND. A STRONG UPPER LEVEL DISTURBANCE WILL FOLLOW THE
FRONT ON FRIDAY. THIS FEATURE WILL BRING PLENTY OF CLOUDS AND
SCATTERED SHOWERS ALONG WITH COOLER TEMPERATURES TO THE AREA. HIGH
PRESSURE THEN BUILDS OVER THE AREA THIS WEEKEND WITH A MIX OF SUN
AND CLOUDS...AND FALL LIKE TEMPERATURES.

&&

.NEAR TERM /TONIGHT/...
BROAD SYNOPTIC SCALE FORCING WILL SWING INTO THE REGION TONIGHT
AHEAD OF VIGOROUS UPPER TROF AND SURFACE COLD FRONT. LEADING S/WV
MOVING INTO WRN NY THIS AFTERNOON WITH AREA OF STEADIER RAIN AND
EMBEDDED CONVECTION WILL TEND TO HOLD INSTABILITY DOWN OVER THE
WRN ZONES. TO THE EAST...THE ATMOSPHERE HAS BECOME MARGINALLY
UNSTABLE WITH MODERATE UNIDIRECTIONAL FLOW AND MARGINAL SHEAR
VALUES. SPC HAS WATCH BOXED EAST CNTRL NY AND NEPA THROUGH THE
EVENING IN RESPONSE...BUT WE EXPECT ANY TYPE OF SVR WEATHER TO BE
ISOLD IN NATURE AS THERE WILL ONLY BE A BRIEF WINDOW FOR SVR POTNL
DURING THE LATE AFTERNOON HOURS BEFORE PROFILES BECOME MORE TROPICAL
IN NATURE...WITH CONVECTIVE MODE SHIFTING TO HEAVY RAIN TONIGHT.
NAM/GFS SOLUTIONS ARE CLOSE...BUT GFS HAS PERFORMED BETTER AT
HANDLING THE SLOWER AND WEAKER SFC FRONT. WILL CONTINUE WITH SCT-
NMRS SHRA/TSRA ACTIVITY INTO EARLY EVENING...THEN MODEL TIMING
LOOKS TO BRING BEST CHC FOR WIDESPREAD RAIN/THUNDER INTO THE AREA
DURING EVENING...AND GRADUALLY DIMINISHING FROM WEST TO EAST
OVERNIGHT AND EARLY FRIDAY.

&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...
DEEPER MOISTURE PLUME IN THE SOUTHWEST FLOW GETS SHUNTED EAST
FAIRLY EARLY ON FRIDAY WITH -20C 500 MB COLD CORE TROF MOVING
OVERHEAD DURING THE AFTERNOON. THIS SEEMS TO BE A GOOD SET UP FOR
STEEP LOW-MID LVL LAPSE RATES AND BOUNTIFUL STRATOCU CLOUDS WITH
SPOTTY SHOWERS...ESPECIALLY DURING THE AFTERNOON. COULD SEE A
RELATIVE DRY PERIOD LATE MORNING HOURS IN DRY SLOT...THEN GET MORE
OF THOSE SHOWERS DURING THE AFTERNOON. CERTAINLY COOLER TEMPS THAN
LAST FEW DAYS...BUT WITHOUT MUCH DROP TONIGHT...WE SHOULD STILL BE
ABOVE NORMAL IN THE UPPER 60S-LOW 70S.

HIGH PRESSURE WILL THEN BUILD IN FOR THE WEEKEND...BUT AGAIN WITH
THE COLD ADVECTION OVER LAKE ONTARIO CONTINUING INTO SATURDAY IT
WILL TAKE MOST OF THE MORNING AND TO MIX OUT ANY RESIDUAL STRATOCU
CLOUDS OVER UPSTATE NEW YORK...WITH THE BETTER HALF OF THE DAY
DURING THE AFTERNOON. REFRESHING FALL LIKE TEMPERATURES ARE THEN
EXPECTED THROUGH SUNDAY WITH CLEAR SKIES. FOLLOWED MAV/FWC/MET MOS
GUIDANCE BLEND WITH SOME LOCAL ADJUSTMENTS FOR COLDER TEMPS IN THE
VALLEYS ON SATURDAY NIGHT.

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...
IN THE UPPER LEVELS AN EASTERN RIDGE AND WESTERN TROF (NEGATIVE
PNA PATTERN) WILL PERSIST THROUGH THE EXTENDED PERIOD. TEMPS WILL
REMAIN ABOVE NORMAL WITH DRY CONDITIONS.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
COMPLEX WEATHER SCENARIO DURING NEXT 24 HOURS RESULTING IN A LOW
CONFIDENCE TAF PACKAGE. DIURNAL INSTABILITY WILL INITIATE SCATTERED
CONVECTION THIS AFTERNOON. CONVECTIVE ACTIVITY MORE LIKELY OVER
CENTRAL/SOUTHERN PORTION OF CWA, FOR THESE TERMINALS INCLUDED CB
IN TEMPO SHOWER GROUP. ONCE CELLS DEVELOP AND COVERAGE IS MORE
CERTAIN AMENDMENTS MAY BE NEEDED TO INCLUDE TSRA. THIS EVENING AND
OVERNIGHT, WAVE LIFTING FROM THE OHIO VALLEY WILL PRODUCE
WIDESPREAD RAINFALL WITH MVFR CONDITIONS EXPECTED. IFR CONDITIONS
ARE POSSIBLE LATER TONIGHT BUT NOT INCLUDED IN TAF SO FAR. AFTER
MORNING FOG AND LOW CLOUDS LIFT BY 14Z, CONDITIONS WILL BE MVFR/VFR
WITH CIGS BTW 2500-3500 FT. LIGHT WINDS WILL BECOME NORTHWEST
OVERNIGHT THEN INCREASE TO AROUND 10 KNOTS BY MID MORNING FRIDAY.

OUTLOOK...FRIDAY NIGHT THROUGH MONDAY, VFR CONDITIONS EXPECTED OUTSIDE
OF MORNING FOG AT ELM.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
PA...NONE.
NY...NONE.

&&

SYNOPSIS...JAB
NEAR TERM...JAB
SHORT TERM...JAB
LONG TERM...RRM
AVIATION...RRM

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BINGHAMTON NY
349 PM EDT THU SEP 27 2007

NYZ009-036-037-045-046-056-057-062-282000-
NORTHERN ONEIDA-MADISON-SOUTHERN ONEIDA-CHENANGO-OTSEGO-BROOME-
DELAWARE-SULLIVAN-
349 PM EDT THU SEP 27 2007

...SEVERE THUNDERSTORM WATCH 690 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK AND
SOUTHEASTERN NEW YORK.

.DAY ONE...THIS AFTERNOON AND TONIGHT

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

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

NYZ044-055-282000-
CORTLAND-TIOGA-
349 PM EDT THU SEP 27 2007

...SEVERE THUNDERSTORM WATCH 690 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK.

.DAY ONE...THIS AFTERNOON AND TONIGHT

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

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT.

NYZ015>018-022>025-282000-
YATES-SENECA-SOUTHERN CAYUGA-ONONDAGA-STEUBEN-SCHUYLER-CHEMUNG-
TOMPKINS-
349 PM EDT THU SEP 27 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS MAY CONTAIN HEAVY RAINFALL THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

PAZ038>040-043-044-047-048-072-282000-
BRADFORD-SUSQUEHANNA-NORTHERN WAYNE-WYOMING-LACKAWANNA-LUZERNE-PIKE-
SOUTHERN WAYNE-
349 PM EDT THU SEP 27 2007

...SEVERE THUNDERSTORM WATCH 691 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

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

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

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