Special Weather Statement, NWS Binghamton, NY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
156 PM EDT SUN AUG 7 2011

.SYNOPSIS...
LOW PRESSURE WILL TRACK ACROSS THE AREA TODAY RESULTING IN
SCATTERED SHOWERS AND THUNDERSTORMS, PRIMARILY THIS AFTERNOON.
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED AGAIN
ON MONDAY AS A SECONDARY COLD FRONT CROSSES THE REGION. UNSETTLED
WEATHER WILL CONTINUE INTO MID WEEK.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
UPDATED AT 1415Z...SHOWERS ASSOCIATED WITH A SFC LOW AND A 500 MB
SHORTWAVE ARE TRYING TO DEVELOP THIS MORNING. SO FAR, THEY HAVE
BEEN PRETTY UNSUCCESSFUL, BUT MAY HAVE A BETTER CHANCE AS THE DAY
CONTINUES AND TEMPERATURES RISE. THERE IS PLENTY OF MOISTURE
AROUND WITH SFC DP IN THE UPPER 60S TO LOW 70S. MODELS SHOWING
PWATS TO BE BETWEEN 1.5 AND 2 INCHES TODAY. MBE VECTORS ARE
SHOWING TO BE MARGINAL. CAPES ARE BETWEEN 500 AND 1300 JOULES
ACROSS THE CWA. BUT, THE CAPE IS TALL AND SKINNY. MID LEVEL LAPSE
RATES LOOK TO BE BELOW 6. BULK SHEAR IS WEAK IN THE 0-1 AND 0-3KM
LAYERS. THE 0-6 IS AROUND 40KTS, BUT WITH THE LAPSE RATES AS LOW
AS THEY ARE, NOT THINKING ANYTHING WILL BE REALIZED TODAY. SO HAVE
ADJUSTED POPS THIS MORNING TO REFLECT THE LACK OF ACTIVITY. ALSO,
NOT VERY CONFIDENT FOR ANY TYPE OF FLOODING SITUATION GIVEN THE
MARGINAL MBES TODAY.

AT 420 AM LOCAL RADARS SHOW ISOLATED SHOWERS OVER WESTERN NEW
YORK. THIS ACTIVITY WILL MOVE INTO THE CENTRAL SOUTHERN TIER AND
FINGER LAKES REGION AROUND DAYBREAK.

SFC LOW PRES CURRENTLY OVER LAKE ERIE WILL TRACK EAST ACROSS THE
REGION TODAY. AS THIS OCCURS SHOWERS WILL BECOME MORE WIDESPREAD
FROM WEST TO EAST AS THE MORNING PROGRESSES. BY MIDDAY INCREASED
POPS TO HIGH CHC ACROSS THE ENTIRE AREA. MODEL SOUNDINGS INDICATE
TALL/SKINNY CAPE AND WITH HIGH PWATS AND DEEP WARM CLOUD LAYER,
THIS MEANS ANY THUNDERSTORMS TODAY WILL PRODUCE VERY HEAVY
DOWNPOURS. YESTERDAY MUCH OF THE AREA RECEIVED LESS THAN A HALF
INCH EXCEPT FOR THE WYOMING VALLEY AND POCONOS WHERE RAINFALL
RANGED FROM 2 TO 4 INCHES. SINCE ACTIVITY IS EXPECTED TO BE
SCATTERED TODAY, CONFIDENCE NOT VERY HIGH THAT THIS AREA WILL
RECEIVE SIGNIFICANT RAINFALL BUT IF LATER SHIFTS SEE SIGNIFICANT
CONVECTION DEVELOPING A FLASH FLOOD WATCH WILL BE NEEDED HERE.

OTHER CONVECTIVE PARAMETERS INDICATE CAPES WILL RANGE FROM
500-1000 J/KG, LI'S -2/-4, 0-6KM BULK SHEAR VALUES AROUND 40 KNOTS
AND MID LEVEL WIND FIELDS AROUND 20 KNOTS. AGAIN, PARAMETERS
INDICATE THE POTENTIAL FOR HEAVY DOWNPOURS AND POSSIBLY AN
ISOLATED SEVERE THUNDERSTORM.

WITH MORE SUNSHINE EXPECTED TODAY THAN YESTERDAY MAX TEMPS WILL
RANGE FROM THE UPPER 70S TO LOWER 80S AND WITH DEW POINTS AROUND
70 IT WILL FEEL VERY MUGGY.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY NIGHT/...
TONIGHT...SFC LOW PRES WILL TRACK TO COASTAL NEW ENGLAND.
CONVECTION WILL DIMINISH THIS EVENING WITH LOSS OF DIURNAL HEATING
AND DEPARTING WAVE. LOWERED POPS TO DRY/SLIGHT CHC EVERYWHERE BUT
NRN CWA. HERE WRAP AROUND MOISTURE AND SECONDARY SFC TROF WILL
KEEP THE THREAT OF SHOWERS THROUGHOUT THE OVERNIGHT PERIOD.

MONDAY...SECONDARY TROF WILL PASS THROUGH THE REGION UNDER
NORTHWEST FLOW. DUE TO DRIER AIR ADVECTING OVER THE AREA ALONG
WITH REDUCED INSTABILITY, ONLY INCLUDED CHC POPS FOR RAIN SHOWERS
ALONG WITH ISOLATED THUNDERSTORMS. BY LATE AFTERNOON THE CHANCE
FOR SHOWERS WILL DECREASE IN THE NRN CWA AS BOUNDARY PASSES
THROUGH. HIGHS WILL RANGE FROM THE UPPER 70S TO AROUND 80 AND WITH DEW
POINTS IN THE LOWER 60S IT WILL FEEL MORE COMFORTABLE.

MONDAY NIGHT...BRIEF UPPER LEVEL RIDGING ALONG WITH SFC HIGH PRES
NOSING DOWN FROM THE UPPER GREAT LAKES WILL PROVIDE A DRY PERIOD
ALONG WITH PARTLY CLOUDY SKIES.

TUESDAY/TUESDAY NIGHT...ANOTHER SFC WAVE WILL MOVE FROM THE OHIO
VALLEY AND PASS SOUTH OF THE REGION DURING THE EVENING. LATE
TUESDAY NIGHT THE NEXT SFC TROF WILL APPROACH THE REGION BY EARLY
WEDNESDAY MORNING. WILL CONTINUE WITH LOW CHC POPS FOR THESE
FEATURES TUESDAY AFTERNOON THROUGH TUESDAY NIGHT.

&&

.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
UPDATED AS OF NOON...UNSETTLED PATTERN CONTINUES IN THE LONG TERM
WITH A BROAD TROF IN THE EAST. AS THE PREVIOUS FORECASTER
MENTIONED YESTERDAY WITH THE TROF IN THE EAST AND VARIOUS
SHORTWAVES MOVING THROUGH THE MEAN FLOW...LOW CONFIDENCE IN EXACT
TIMING OF THE BEST PERIODS FOR RAINFALL BUT GIVEN THE SET-UP WE
WILL BE AT RISK FOR SHOWERS/STORMS PRETTY MUCH THE ENTIRE EXTENDED
PERIOD. MUCH LIKE WITH YESTERDAY'S MODEL RUNS THE 0Z GUIDANCE
CONTINUES TO SHOW A BRIEF PERIOD OF BUILDING HEIGHTS
FRIDAY...BEFORE A NEW TROF SETS UP FOR THE UPCOMING WEEKEND. WITH
THAT IN MIND OUR BEST SHOT AT A DRY DAY WILL REMAIN TO BE FRIDAY.
WITH 850 TEMPS IN THE LOWER TEENS HIGHS WILL IN THE 70S OR JUST
SLIGHTLY BELOW AVERAGE FOR EARLY AUGUST.

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
SCATTERED SHOWERS AND A FEW THUNDERSTORMS WITH HEAVY RAIN ACROSS
THE REGION THIS AFTERNOON AND EVENING. THERE IS A SCT-BKN CLOUD
DECK BETWEEN 2 AND 3 KFT SO EXPECT OCNL MVFR CIGS WITH LOCAL IFR
CONDITION IN HEAVY SHOWERS AND THUNDERSTORMS. AFTER 22Z
THUNDERSTORMS AND SHOWERS SHOULD BE DIMINISHING FROM THE WEST BUT
A LINGERING SHOWER IS STILL POSSIBLE. AS CLOUDS BECOME MORE
SCATTERED...LOW LEVELS ARE VERY MOIST WITH HAZE BEING REPORTED
MANY SITES. AS CLOUDS SCATTER OUT AND TEMPERATURES COOL WITH LIGHT
WINDS...LIGHT FOG MAY SET IN EARLY TONIGHT WITH IFR FOG POSSIBLE
IN THE RIVER VALLEYS. CONDITIONS SHOULD IMPROVE TO VFR MOST AREAS
BY 15Z MON.

OUTLOOK...

MONDAY THROUGH THURSDAY...PREVAILING VFR WITH SCATTERED
MVFR IN SHOWERS/THUNDERSTORMS.

.FRIDAY...VFR.

&&

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

&&

SYNOPSIS...RRM
NEAR TERM...RRM/SLI
SHORT TERM...RRM
LONG TERM...HEDEN
AVIATION...BMW

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
229 PM EDT SUN AUG 7 2011

NYZ023-025-055-071930-
SCHUYLER NY-TIOGA NY-TOMPKINS NY-
229 PM EDT SUN AUG 7 2011

...HEAVY RAIN PRODUCING THUNDERSTORMS WILL AFFECT NORTHWESTERN
TIOGA...SOUTHERN SCHUYLER AND SOUTHERN TOMPKINS COUNTIES...

* AT 220 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERAL CLUSTERS OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING VERY
  HEAVY RAIN.  THESE STORMS WERE LOCATED FROM NEAR WATKINS GLEN...TO
  NEAR CATHARINE...AND MOVING EAST AT 20 MPH.

* THE STRONG THUNDERSTORMS WILL AFFECT...
  AREAS FROM WATKINS GLEN...TO NEAR DANBY AND THE EXTREME NORTHERN
  PART OF TIOGA COUNTY THROUGH 330 PM.

EXPECT TORRENTIAL RAINFALL WITH THESE THUNDERSTORM CLUSTERS AS THEY
MOVE ACROSS THE SAME AREAS. LOCALIZED PONDING OF WATER...SMALL
STREAM...STORM DRAIN AND POOR DRAINAGE FLOODING ALONG TOWN AND
VILLAGE STREETS WILL BE POSSIBLE FROM THESE STORMS.

LAT...LON 4244 7701 4250 7627 4241 7625 4239 7623
      4228 7621 4225 7653 4228 7654 4228 7662
      4225 7662 4224 7664 4225 7673 4229 7673
      4229 7702

JAB