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Severe weather threat on Tuesday?


weatherwiz

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I've been one of the few not on board for storms today since Sunday. Others have been dryhumping today for days.

And Tip says it's sunnier today than modelled

There's been decent sunshine in E MA. Won't change that we have crappy ML lapse rates and no shear.

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Not with a cloudy afternoon in place

Then why do we have 1000 J/KG of SBcape with 500 J/KG of MLcape and LI values around -2C to -4C?

Granted these higher dewpoints are helping but alot of the work came from what sun we did have.

It didn't matter if we had full sun anyways, instability values wouldn't get much above 1500 J/KG (except sfc-based cape) due to the poor lapse rates.

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MESOSCALE DISCUSSION 0926

NWS STORM PREDICTION CENTER NORMAN OK

1234 PM CDT TUE MAY 24 2011

AREAS AFFECTED...PARTS OF SRN NEW ENGLAND AND THE NORTHEAST

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 241734Z - 241930Z

AN ISOLATED THREAT FOR DAMAGING WIND MAY DEVELOP THIS AFTERNOON.

OVERALL MARGINAL/SPORADIC NATURE OF THE SEVERE THREAT SHOULD

PRECLUDE THE NEED FOR A WW...WITH A 20 PERCENT PROBABILITY OF

ISSUANCE BY 20Z.

SCATTERED SHOWERS AND ISOLATED TSTMS HAVE RECENTLY COMMENCED ACROSS

PORTIONS OF SRN VT THROUGH ERN/CNTRL NY INTO NRN PA WITHIN A BROADLY

CYCLONIC UPPER-LEVEL FLOW REGIME. ACTIVITY WILL LIKELY STRUGGLE TO

BECOME ROBUST GIVEN POOR MID-LEVEL LAPSE RATES OF AROUND 6 DEG C/KM

AT 700-500 MB SAMPLED IN REGIONAL 12Z RAOBS. DESPITE AREAS OF

SCATTERED TO OVERCAST CLOUD COVERAGE...POCKETS OF STRONGER HEATING

WILL RESULT IN A WEAKLY UNSTABLE AIR MASS. GIVEN MODERATE EFFECTIVE

SHEAR OF 20 TO 30 KT...OVERALL SEVERE POTENTIAL SHOULD REMAIN

MARGINAL AND PERHAPS YIELD ISOLATED DOWNBURSTS IN STRONGER CORES.

..GRAMS.. 05/24/2011

ATTN...WFO...GYX...BOX...BTV...OKX...ALY...PHI...BGM...CTP...

LAT...LON 40247430 40377586 41067697 41727672 42557602 43557418

43817228 43647120 43147080 42407089 41547153 41267212

40687347 40557409 40247430

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