Flash Flood Warning 9, NWS Binghamton, NY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
142 AM EDT MON APR 16 2007

.AVIATION /06Z-06Z/...
MAJOR WINTER STORM AFFECTING ALL TAF SITES WITH OCCASIONALLY HEAVY
SNOW DURING THE OVERNIGHT AND THRU THE MORNING HOURS. CONDITIONS WILL
OBVIOUSLY BE QUITE LOW DURING MOST OF THE TAF PERIOD...WITH IFR AT
BEST THRU AT LEAST EARLY AFTN TODAY. SNOW WILL BEGIN TO TAPER OFF
TO SHSN ESP ACROSS AVP AND ELM BY LATE AFTN WITH SOME IMPROVEMENT
TO MVFR POSSIBLE AT ALL SITES BY EARLY EVENING.

ANOTHER BIG FACTOR WILL BE THE WINDS. INCREASING NORTHERLY WINDS
OVERNIGHT TO 15 TO 25 KTS BY DAYBREAK. NWLY WINDS 15 TO 20 KTS
WITH GUSTS TO 35 KTS OR HIGHER PSBLE DURING THE DAY TODAY.

&&

PREV DISCUSSION...
/ISSUED 732 PM EDT SUN APR 15 2007/

UPDATE /REST OF TONIGHT/...
TWEAKS MADE TO NEAR-TERM TEMPERATURE AND WEATHER GRIDS...TO
ACCOUNT FOR FALLING READINGS EARLY THIS EVENING...NEAR AND WEST OF
I-81 IN CENTRAL NY. ALSO....SOME MODIFICATIONS MADE FOR
PRECIPITATION TYPE TRENDS.

SATELLITE LOOPS NICELY SHOW THAT THE RAPID INTENSIFICATION PHASE
OF OUR STORM SYSTEM IS WELL UNDERWAY...WITH AN EXPANSION OF
COOLING CLOUD TOPS NEAR THE SPINE OF THE CENTRAL APPALACHIANS. AN ELONGATED
BAND OF HEAVY RAIN EXTENDS FROM THE VIRGINIA COAST NORTH ALL THE
WAY TO NEAR ALBANY. HEAVIER AREAS OF PRECIPITATION ARE ALSO
EXPANDING NORTHWARD OUT OF CENTRAL VA AND MD AS OF THIS WRITING.
ALL OF THIS HEAVIER PRECIPITATION SHOULD GET WRAPPED BACK TO THE
NORTH AND NORTHWEST OVERNIGHT TOWARDS OUR FORECAST AREA...AS THE
MID-LEVEL CYCLONE DEEPENS AND DEFORMATION FORCING TAKES OVER.

SHORT-TERM CONCERNS CONTINUE TO BE RELATED TO THE HEAVY RAINFALL
AND POTENTIAL RUNOFF PROBLEMS IN OUR FAR EASTERN/SOUTHEASTERN
ZONES...PARTICULARLY EASTERN SULLIVAN AND PIKE COUNTIES. SPOTTER
REPORTS INDICATE THAT 1.5-2.5 OF RAIN HAS FALLEN SO FAR...WITH
MORE IN THE PIPELINE. THIS SITUATION WILL CONTINUE TO BE CLOSELY
WATCHED THIS EVENING.

ALL IN ALL...WE HAVE FAIRLY HIGH CONFIDENCE IN OUR WINTER STORM
WARNINGS FOR THE OVERNIGHT PERIOD AND ON MONDAY. EVEN THOUGH THE
PRECIPITATION SHIELD IS SOMEWHAT DISORGANIZED ACROSS MUCH OF THE
REGION AS OF THIS WRITING...THE STRONG FORCING FOR LIFT MENTIONED
EARLIER IN THE DISCUSSION SHOULD ULTIMATELY LEAD TO FURTHER
COOLING OF THE LOW-LEVEL TEMPERATURES AND HEAVY SNOWFALL. WERE
STILL LOOKING FOR OVER A FOOT OF SNOW...BEFORE ALL IS SAID AND
DONE...CENTERED ALONG THE I-81 CORRIDOR FROM THE TWIN TIERS
NORTHWARD.

-MJ

PREV DISCUSSION...
/ISSUED 342 PM EDT SUN APR 15 2007/

SHORT TERM /TONIGHT THROUGH TUESDAY/...
STORM DEVELOPING ON SCHEDULE WITH 987MB LOW OVER CENTRAL NC AND
NEW DEVELOPMENT OF 990 LOW OVER DELAWARE. GREATEST PRESSURE FALLS
STILL INDICATE THIS LOW WILL HEAD NORTHEAST ALONG THE ERN SEABOARD
THIS EVENING. AS IT DOES SO AND H5 LOW CONTINUES TO DEEPEN AND
CLOSE OFF...STORM WILL DEEPEN RAPIDLY OFF THE COAST.

FOR THE EVENING...MODERATE TO HVY RAIN WILL CONTINUALLY RIDE UP
EAST OF I-81 IN NEPA...INCLUDING INTO SULLIVAN/OTSEGO/DELAWARE
CTYS. THIS HAS PROMPTED THE ISSUANCE OF A FLOOD WATCH FOR SRN
ZONES THRU 12Z MONDAY WITH TOTAL RAINFALL AMOUNTS OF 2-3 INCHES
EXPECTED. THIS WILL LIKELY LEAD TO RISES ON CREEKS...STREAMS AND
RIVERS ESPECIALLY IF THE HEAVIER AMNTS MATERIALIZE.

AS FOR THE SNOW...EXPECT CNY TO SWITCH OVER TO ALL SNOW BTWN 21Z-
00Z THIS EVENING. MODELS INDICATE INTENSE BANDING AND
FRONTOGENETICAL FORCING SMACK DAB ON TOP OF THE I-81 CORRIDOR WITH
QPF OF 1.15 INCHES OVERNIGHT. DUE TO POSN OF THE BANDING...HAVE
ADDED BRADFORD/SUSQUEHANNA AND WYOMING INTO WINTER STORM WARNING.
WIDESPREAD ACCUMS OF UP TO A FOOT POSSIBLE FROM TWIN TIERS NORTH.
ALTHO SHORT-RANGE MODELS INDICATE SOME WRMR TEMPS ALOFT MAY SNEAK
IN...STRONG DYNAMICS AND TREMENDOUS LIFT SHUD BE ENUF TO KEEP
LIQUID ALL FRZN. INTENSE RATES WILL LEAD TO VERY HAZARDOUS CONDS
OVERNIGHT TONIGHT. ALL TIME RECORD SNOWFALL FOR APRIL LOOKS TO BE
IN JEOPARDY FOR BINGHAMTON AIRPORT AND SYRACUSE.

WITH DYNAMICS COUPLED WITH HIGHER TERRAIN ACROSS NEPA...HAVE
HOISTED ADVISORY FOR THIS AREA WITH SNOW TOTALS OF 4 TO 8 INCHES
OVR THE POCONOS. ONLY A FEW INCHES POSSIBLE IN THE VALLEYS. RAIN
TAKES LONGER TO CHG TO SNOW WITH MOST AREAS OVR NEPA NOT SWITCHING
OVR UNTIL AFTER MIDNIGHT. FURTHER EAST...WARMER AIR WILL BEGIN TO
WRAP IN AND THROW SLEET AND RAIN INTO THE MIX. LEAST ACCUMS
EXPECTED OVR PIKE AND SULLIVAN CTYS WHERE WARM AIR CUTS DOWN
ACCUMS AND POSSIBLE DRY SLOT IS BEING SHOWN BY MESOSCALE MDLS.

EXPECT SEVERAL UPDATES TO FCST TONIGHT AS EVENT UNFOLDS AND LOW
MOVES OFF OF THE COAST. CONFIDENCE IS HIGH ON SIGNIFICANT SNOW WEST
OF I-81 TONIGHT. REMAINDER OF FCST IS STILL IN QUESTION UNTIL WE
SEE THE WHITES OF ITS EYES.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
AN OMEGA BLOCK PATTERN IS FORECAST TO SET UP ACROSS THE CONUS
EARLY IN THIS PERIOD...THEN BREAK DOWN BY THE WEEKEND...RETURNING
US TO MORE SEASONABLE CONDITIONS. IT IS POSSIBLE THAT THE MODELS
ARE BREAKING THIS PATTERN DOWN A DAY OR SO TOO SOON...BUT AT THE
MOMENT THIS IS NOT READILY EVIDENT IN OPERATIONAL RUNS OF THE GFS
OR THE MREF ENSEMBLES. GIVEN THIS EXPECTED PATTERN
EVOLUTION...CLOUDS AND BELOW NORMAL TEMPERATURES WILL PERSIST
WEDS-THURS UNDER THE WESTERN INFLUENCE OF UPPER LOW. LATEST MEX
GUIDANCE LOOKS COOLER AND MORE REASONABLE WITH THE ENSEMBLE 925 MB
T PREDICTIONS...OR THE HPC FCSTS SO WILL LEAN CLOSE TO THE MEX
WEDS-THURS. THE RIDGING BEGINS TO DEVELOP FRI...WITH SWLY FLOW
THEN DEVELOPING LATER IN THE WEEKEND SO MORE SUNSHINE IS PLANNED
FOR THE WEEKEND ALONG WITH TEMPS NEAR OR SLGHTLY ABOVE NORMAL.
HPC/MEX GUIDANCE BLEND SEEMS REASONABLE DAYS 6-7.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
NY...WINTER STORM WARNING UNTIL 8 PM EDT THIS EVENING FOR NYZ009-
     015>018-022>025-036-037-044>046-055>057.

     FLOOD WATCH UNTIL 8 AM EDT THIS MORNING FOR NYZ057-062.

     WINTER WEATHER ADVISORY UNTIL 8 PM EDT THIS EVENING FOR NYZ062.

PA...WINTER STORM WARNING UNTIL 8 PM EDT THIS EVENING FOR PAZ038-
     039-043.

     FLOOD WATCH UNTIL 8 AM EDT THIS MORNING FOR PAZ040-044-047-048-
     072.

     WINTER WEATHER ADVISORY UNTIL 8 PM EDT THIS EVENING FOR PAZ040-
     044-047-048-072.

&&

AVIATION...

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BINGHAMTON NY
344 PM EDT SUN APR 15 2007

NYZ009-015>018-022>025-036-037-044>046-055-056-PAZ038-039-043-161945-
NORTHERN ONEIDA-YATES-SENECA-SOUTHERN CAYUGA-ONONDAGA-STEUBEN-
SCHUYLER-CHEMUNG-TOMPKINS-MADISON-SOUTHERN ONEIDA-CORTLAND-CHENANGO-
OTSEGO-TIOGA-BROOME-BRADFORD-SUSQUEHANNA-WYOMING-
344 PM EDT SUN APR 15 2007

...WINTER STORM WARNING IN EFFECT UNTIL 8 PM EDT MONDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK AND
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.

   WINTER STORM WARNING

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   WINTER STORM WARNING

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED ON MONDAY.

NYZ057-161945-
DELAWARE-
344 PM EDT SUN APR 15 2007

...WINTER STORM WARNING IN EFFECT UNTIL 8 PM EDT MONDAY...
...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...

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.

   FLOOD WATCH
   WINTER STORM WARNING

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   FLOOD WATCH
   WINTER STORM WARNING

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED ON MONDAY.

NYZ062-PAZ040-161945-
SULLIVAN-NORTHERN WAYNE-
344 PM EDT SUN APR 15 2007

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 8 PM EDT MONDAY...
...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEASTERN NEW YORK AND
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.

   FLOOD WATCH
   WINTER WEATHER ADVISORY

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   FLOOD WATCH
   WINTER WEATHER ADVISORY

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED ON MONDAY.

PAZ044-047-048-072-161945-
LACKAWANNA-LUZERNE-PIKE-SOUTHERN WAYNE-
344 PM EDT SUN APR 15 2007

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 8 PM EDT MONDAY...
...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING...

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.

   FLOOD WATCH
   WINTER WEATHER ADVISORY

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

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

   FLOOD WATCH
   WINTER WEATHER ADVISORY

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED ON MONDAY.

PB