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5/16 WESTERN NE Severe Threat Disco


ChrisM

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Clouds have really hung tough here around Albany this morning. Looking at the satellite when I got in...honestly expected to be partly-mostly sunny by 10am. Here we are almost noon, and I'm just finally getting the first peaks of sun. Looks like some cumulus already starting to pop just south of here over the Catskills who have had some sun for the past couple hours. SPC did mention possibility of the differential heating igniting convection ahead of the front, which would lead to some discrete cells. Curious to see if that plays out. I'm nervous of that happening then squashing chances for a decent squall line later in the afternoon. Guess we'll see.

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Started brightening quite a bit here in the last 15 minutes or so and my optimism is increasing. Might have blue skies here fairly soon.

65.5/64.8

Fail. Solar radiation graph fell off a cliff right after I posted and we're back in the murk.

Assuming things do go well, I'm glad to see the focus in the latest SPC shifted to the NW of us in the valley. The 30% wind contour is almost certainly associated with linear mode convection near the front. If it winds up being oriented in the same manner as the contour, we'd likely see enhanced southerly flow in the valley out ahead... I'll sign for the much lower chance at a supercell ripping nickels than a 45 mph gust from a broken squall line.

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Sun has been out for a while here and clouds are already forming over the mountain tops. Just cancelled little kid lacrosse practice for later this afternoon. K-3 kids, a field with no shelter, and the potential for lightning sounded like a bad combination.

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MESOSCALE DISCUSSION 0824

NWS STORM PREDICTION CENTER NORMAN OK

1127 AM CDT WED MAY 16 2012

AREAS AFFECTED...MUCH OF CNTRL AND ERN NY...VT...NERN PA

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 161627Z - 161830Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...STORMS WILL DEVELOP ACROSS THE AREA OVER THE NEXT FEW

HOURS...POSSIBLY IN SEVERAL LOCATIONS AT ONCE. LARGE HAIL AND A FEW

DAMAGING WIND GUSTS ARE LIKELY.

DISCUSSION...VISIBLE IMAGERY SHOWS CU FIELDS EXPANDING OVER MUCH OF

THE AREA. THE FIRST IS ALONG THE COLD FRONT FROM NWRN PA INTO WRN

NY...BUT INSTABILITY IS CURRENTLY LOW WITH DEWPOINTS MIXING INTO THE

40S F. FARTHER E...ANOTHER BAND OF CLOUDS WAS PERSISTING FROM SRN

QUEBEC INTO NRN AND CNTRL NY...ON THE EDGE OF THE ADVANCING UPPER

VORT. THE THIRD AREA WAS OVER SERN NY AND VT...NEAR THE SURFACE

THETA-E AXIS WHERE MUCAPE WAS APPROACHING 1500-2000 J/KG.

WITH CONTINUED HEATING AND LITTLE CIN...STORMS WILL LIKELY FORM BY

18-19Z. THE STRONGEST FORCING WILL BE NEAR THE FRONT...BUT OTHER

STORMS MAY FORM FARTHER E IN THE INSTABILITY AXIS. WITH FAVORABLE

DEEP LAYER FLOW AND INCREASING SPEED SHEAR WITH HEIGHT...SUPERCELLS

WILL BE LIKELY CAPABLE OF LARGE HAIL...PERHAPS UP TO GOLF BALL SIZE.

A WIND THREAT WILL ALSO BE PRESENT...PERHAPS MORE WITH THE FRONTAL

ACTIVITY WHERE STORM MODE COULD BENEFIT FORM MERGED OUTFLOWS. THE

TORNADO THREAT SHOULD BE RELATIVELY LOW WITH WEAK FLOW IN THE LOWEST

2KM...BUT...WINDS WILL VEER WITH HEIGHT AND COULD RESULT IN A

WEAK...BRIEF SPIN-UP.

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Severe Thunderstorm Watch just issued and includes all of the Ct. Valley from Hartford north

WWUS40 KWNS 161718

WWP0

SEVERE THUNDERSTORM WATCH PROBABILITIES FOR WS 0280

NWS STORM PREDICTION CENTER NORMAN OK

1218 PM CDT WED MAY 16 2012

WS 0280

PROBABILITY TABLE:

PROB OF 2 OR MORE TORNADOES : 20%

PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES : 05%

PROB OF 10 OR MORE SEVERE WIND EVENTS : 50%

PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 30%

PROB OF 10 OR MORE SEVERE HAIL EVENTS : 80%

PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 30%

PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : >95%

&&

ATTRIBUTE TABLE:

MAX HAIL /INCHES/ : 2.0

MAX WIND GUSTS SURFACE /KNOTS/ : 60

MAX TOPS /X 100 FEET/ : 450

MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 26030

PARTICULARLY DANGEROUS SITUATION : NO

&&

FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND

WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU0.

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THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

WESTERN CONNECTICUT

WESTERN AND CENTRAL MASSACHUSETTS

WESTERN MAINE

MUCH OF NEW HAMPSHIRE

EASTERN NEW YORK

NORTHEAST PENNSYLVANIA

VERMONT

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 120 PM UNTIL

900 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF

NEWPORT VERMONT TO 20 MILES SOUTH OF MONTICELLO NEW YORK. FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS

AFTERNOON ACROSS MUCH OF EASTERN NY/NORTHEAST PA AND WESTERN NEW

ENGLAND AS AN UPPER TROUGH APPROACHES FROM THE WEST. STRONG DAYTIME

HEATING COUPLED WITH A MOIST BOUNDARY LAYER WILL RESULT IN MODERATE

CAPE VALUES AND LITTLE CINH. SHEAR PROFILES ARE FAVORABLE FOR

ORGANIZED/SUPERCELL STORMS CAPABLE OF DAMAGING WINDS AND HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 26030.

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