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Severe Threat June 23rd


IsentropicLift

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Im not that good at reading these soundings. All i know is the lapse rates look good. What does this suggest?

 

Strong instability, sufficient shear, very high PWATS...basically a good profile for a nice severe day if things downstream work out. 

 

 

 

 

.SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/...

DEPARTING MCS ACROSS NEW ENGLAND WILL COMPLICATE FORECAST SOME

FOR TUESDAY AHEAD OF AN APPROACHING COLD FRONT...AS MOSTLY CLOUDY

SKIES COULD BE PRESENT FOR THE FIRST PART OF THE DAY...IN ADDITION

TO A FEW LINGERING SHOWERS/T-STORMS EARLY AS THE WARM FRONT LIFTS

NORTH. BY LATE MORNING...EXPECT BREAKS IN CLOUDS AND GUSTY SW FLOW

TO PUSH TEMPS TO AROUND OR JUST ABOVE 90 IN NYC...LOWER 90S ACROSS

NE NJ AND MID TO UPPER 80S ELSEWHERE. HEAT INDICES WILL PEAK

AROUND 95 IN NYC AND IN THE UPPER 90S IN NE NJ...AND AROUND 90

ELSEWHERE. THIS WILL GENERATE MODERATE INSTABILITY AHEAD OF THE

COLD FRONT...WITH MODEL FCST CAPES OF NEAR OR JUST ABOVE 2000 J/KG

ESPECIALLY JUST INLAND. AFTER A SEVERAL HOUR BREAK MID DAY...THE

FRONT WILL BEGIN TO TOUCH OFF SCATTERED SHOWERS/T-STORMS WHICH

WILL PROGRESS FROM NW TO SE ACROSS THE REGION BEGINNING INLAND

DURING THE EARLY-MID AFTERNOON. GIVEN THE INSTABILITY IN PLACE AND

40-50 KT OF 0-6 KM SHEAR FORECAST BY THE MODELS...SEVERE T-STORMS

ARE FORECAST...WITH THE STORM PREDICTION CENTER PLACING THE ENTIRE

REGION IN A SLIGHT RISK. WHILE AN ISOLATED TORNADO CANNOT BE RULED

OUT...DAMAGING WINDS AND PERHAPS SOME LARGE HAIL APPEAR TO BE THE

MAIN THREATS.

 

 

9b6a5db5f954119208aceaac9055b6e7.png

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UPTON

NATIONAL WEATHER SERVICE NEW YORK NY
1056 PM EDT MON JUN 22 2015

 

SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/...
DEPARTING MCS ACROSS NEW ENGLAND WILL COMPLICATE FORECAST SOME
FOR TUESDAY AHEAD OF AN APPROACHING COLD FRONT...AS MOSTLY CLOUDY
SKIES COULD BE PRESENT FOR THE FIRST PART OF THE DAY...IN ADDITION
TO A FEW LINGERING SHOWERS/T-STORMS EARLY AS THE WARM FRONT LIFTS
NORTH. BY LATE MORNING...EXPECT BREAKS IN CLOUDS AND GUSTY SW FLOW
TO PUSH TEMPS TO AROUND OR JUST ABOVE 90 IN NYC...LOWER 90S ACROSS
NE NJ AND MID TO UPPER 80S ELSEWHERE. HEAT INDICES WILL PEAK
AROUND 95 IN NYC AND IN THE UPPER 90S IN NE NJ...AND AROUND 90
ELSEWHERE. THIS WILL GENERATE MODERATE INSTABILITY AHEAD OF THE
COLD FRONT...WITH MODEL FCST CAPES OF NEAR OR JUST ABOVE 2000 J/KG
ESPECIALLY JUST INLAND. AFTER A SEVERAL HOUR BREAK MID DAY...THE
FRONT WILL BEGIN TO TOUCH OFF SCATTERED SHOWERS/T-STORMS WHICH
WILL PROGRESS FROM NW TO SE ACROSS THE REGION BEGINNING INLAND
DURING THE EARLY-MID AFTERNOON. GIVEN THE INSTABILITY IN PLACE AND
40-50 KT OF 0-6 KM SHEAR FORECAST BY THE MODELS...SEVERE T-STORMS
ARE FORECAST...WITH THE STORM PREDICTION CENTER PLACING THE ENTIRE
REGION IN A SLIGHT RISK. WHILE AN ISOLATED TORNADO CANNOT BE RULED
OUT...DAMAGING WINDS AND PERHAPS SOME LARGE HAIL APPEAR TO BE THE
MAIN THREATS.


COLD FRONT AND ASSOCIATED T-STORMS WILL PUSH SE OF THE REGION DURING
THE EARLY EVENING HOURS TUESDAY WITH CLEARING BEHIND THE FRONT. A
DRIER AIRMASS WILL BE USHERED INTO THE REGION AS WELL WITH
LOWERING HUMIDITY.

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227eb0e0bdfd06716a7d86db63be4fbf.png

 

 

That EML signature looks very impressive. I think the forecasted parameters could warrant an extension of the enhanced risk southward into PA/NJ. Bulk shear should be 35-40kts juxtaposed with 2500-3000 J/KG CAPE and mid level lapse rates > 7.5C/KM. My primary concerns are potential convective debris limiting destabilization and the strongest forcing / height falls going too far north. But I think we could see some potent cells develop, possibly even some bow echos with the strong unidirectional shear. Tornado threat should be mostly NY State/New England where helicity values are higher, closer to the warm front / directional shear.

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Enhanced Risk for today.

 

day1otlk_1200.gif?1435039472170

 

..NORTHEAST STATES INTO THE MID ATLANTIC...
A CLUSTER OR TWO OF STORMS WILL LIKELY BE ONGOING OVER PORTIONS OF
NEW ENGLAND AND MAY POSE A MARGINAL WIND RISK DURING THE MORNING.
IN WAKE OF THE EARLY-DAY STORM ACTIVITY...THE ATMOSPHERE IS EXPECTED
TO DESTABILIZE AS RICHER LOW-LEVEL MOISTURE IS ADVECTED NEWD BEHIND
AN ADVANCING WARM FRONT MOVING THROUGH THE HUDSON VALLEY AND SRN NEW
ENGLAND. STRONG DIABATIC HEATING AMIDST BREAKS IN CLOUD COVER WILL
YIELD A MODERATELY BUOYANT BOUNDARY LAYER BY EARLY AFTERNOON
/1000-1500 J PER KG MLCAPE/. STRONGER DESTABILIZATION IS FORECAST
TO OCCUR FARTHER S ACROSS PA/NJ INTO NRN VA WHERE 2000-3000 J PER KG
MLCAPE WILL PROBABLY DEVELOP. CONVERGENCE ALONG THE FRONT AND
HEATING WILL FOSTER SCATTERED TO NUMEROUS STORMS AS CINH IS REMOVED.
THE STRONGER DEEP-LAYER WIND PROFILES WILL REMAIN ACROSS THE NERN
U.S. IN ASSOCIATION WITH THE MID-LEVEL WAVE AND SUPPORT ORGANIZED
SEVERE STORMS...INCLUDING SUPERCELL TORNADO POTENTIAL. DEEP-LAYER
SHEAR WILL DECREASE WITH SWD EXTENT IN THE MID-ATLANTIC /30-40 KT
EFFECTIVE SHEAR/ BUT SUPPORT THE DEVELOPMENT OF SEVERE MULTICELL
LINE SEGMENTS CAPABLE PRIMARILY OF A DAMAGING WIND/LARGE HAIL
THREAT. THE FRONT WILL MOVE OFF THE NERN U.S. COAST BY EVENING WITH
THE REMAINING STRONG TO SEVERE STORM THREAT ZIPPERING SWD INTO THE
MID-ATLANTIC STATES.

 
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Most people up here are rightly concerned. No bust call from me but hi-res and satellite / radar trends aren't great in this area. Many people up here are 65-70 degrees still and staring at a wall of cloud debris and remnant MCS to the west.

Hopefully we all get what we want which is a nice severe outbreak

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