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Severe weather threat on Tuesday?


weatherwiz

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LOL all of SNE in a slight risk..... This is actually looking pretty good by our standards..

...NEW ENGLAND SWD TO THE MID-ATLANTIC AND WWD INTO THE OH/TN/MID MS

VALLEYS...

SHOWERS AND SCATTERED THUNDERSTORMS MAY BE ONGOING AT THE START OF

THE PERIOD...AND AS AIRMASS DESTABILIZES AHEAD OF THE SURFACE COLD

FRONT AWAY FROM LINGERING CLOUDS/PRECIPITATION...EXPECT CONVECTION

TO REDEVELOP/INTENSIFY THROUGH THE AFTERNOON.

THE BELT OF STRONGEST FLOW ALOFT IS FORECAST TO REMAIN S OF THE OH

RIVER...BUT INSTABILITY MAY BE MORE LIMITED ACROSS PARTS OF THIS

REGION DEPENDING UPON THE EVOLUTION OF AN ONGOING BOW APPROACHING

THE MID MS VALLEY REGION ATTM. OVERALL...EXPECT BROAD/WIDESPREAD

ZONE OF SEVERE POTENTIAL NEAR AND SE OF THE COLD FRONT...WITH

STRONGEST STORMS WITHIN MULTIPLE BANDS OF CONVECTION CAPABLE OF

PRODUCING HAIL AND DAMAGING WINDS.

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.NEAR TERM /THROUGH TODAY/...

LEAD SHORT WAVE AND ATTENDING WARM FRONT WILL CONTINUE TO MOVE

ACROSS THE REGION EARLY THIS MORNING. THESE FEATURES WILL CONTINUE

TO BE A FOCUS FOR ELEVATED CONVECTION OVER EASTERN NEW ENGLAND

EARLY THIS MORNING. HOWEVER BY SUNRISE MOST OF THE SHOWER ACTIVITY

WILL BE MOVING OFFSHORE WITH SOME SHORT WAVE RIDGING DEVELOPING

OVER SOUTHERN NEW ENGLAND BEHIND THE DEPARTING SHORT WAVE. THIS WILL

RESULT IN SUNSHINE DEVELOPING AS WARM SECTOR OVERSPREADS THE AREA

LATER THIS MORNING. THIS WILL SUPPORT TEMPERATURES RISING RAPIDLY

INTO THE 70S AWAY FROM THE SOUTH COAST AS SURFACE WINDS WILL BE

SSW.

BY MIDDAY A TRAILING SHORT WAVE AND ATTENDING SURFACE COLD FRONT

WILL BE SWEEPING ACROSS NY STATE. THIS WILL LIKELY BE A FOCUS FOR

CONVECTION THIS AFTERNOON AND EVENING. THE DILEMMA WILL BE HOW MUCH

SOLAR HEATING WILL OCCUR OVER SOUTHERN NEW ENGLAND TODAY WITH LOTS

OF DEBRIS CLOUD APPROACHING LATER THIS MORNING FROM CONVECTION

CURRENTLY UPSTREAM ACROSS WESTERN PORTIONS OF NY STATE AND PA.

HOWEVER THE 00Z NAM SUGGEST 2M TEMPS AROUND 80 DEGS AWAY FROM THE

COAST. ALTHOUGH IT/S SURFACE DEW PTS CLIMB TO AROUND 70S TAFTN

WHICH RESULTS IN SB CAPES UPWARDS OF 1800 J/KG. GIVEN TD/S WILL

LIKELY BE LESS THAN 70 DEG SB CAPES ON THE ORDER OF AROUND

1000J/KG IS MORE LIKELY PER THE 00Z GFS...WHICH IS MARGINAL TO

MODEST SB INSTABILITY FOR THIS TIME OF YEAR.

REGARDING OTHER SEVERE WEATHER PARAMETERS...DEEP LAYER SHEAR

ACTUALLY DECREASES AS THE DAY PROGRESSES AND MID LEVEL LAPSE RATES

ARE MARGINAL. WHILE FORCING FOR ASCENT APPEARS MODEST WITH GOOD

LOW LEVEL CONVERGENCE COMBINED WITH RRQ OF UPPER LEVEL JET MOVING

OVER SOUTHERN NEW ENGLAND...THE LACK OF DEEP LAYER...MARGINAL SB

INSTAB AND WEAK MID LEVEL LAPSE RATES FAVOR SCATTERED CONVECTION

BUT MUCH OF THE ACTIVITY SHOULD BE SUB-SEVERE. HOWEVER IF SURFACE

HEATING IS MORE THAN ANTICIPATED /CLOUD DEBRIS FROM CONVECTION

OVER PA AND NY ERODES/THINS QUICKER THAN EXPECTED/ CONVECTION THIS

AFTERNOON COULD BE MORE WIDESPREAD AND ROBUST.

THE HIGHER PROBABILITY FOR SEVERE WEATHER WILL BE IN THE FORM OF HEAVY

DOWNPOURS AS PWATS CLIMB TO ABOUT 1.8 INCHES ALONG WITH SFC TD/S

IN THE 60S! THEREFORE IF ANY SHOWERS/TSTMS CONTINUE TO TRACK OVER

THE SAME AREA URBAN/POOR DRAINAGE FLOODING WILL BE POSSIBLE AND

MAY IMPACT THE LATE DAY COMMUTE. GIVEN ALL MODEL GUIDANCE GENERATE

MEASURABLE PRECIP WILL LEAN TOWARD THE HIGHER 21Z SREF POPS AND

WILL INSERT ENHANCED WORDING REGARDING HEAVY RAINFALL AND POOR

DRAINAGE FLOODING THIS AFTERNOON AND EVENING.

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This was always the potential, but hard to get excited when you think about what will happen in the Plains again.

There may be some marginal reports but not a svr event to get excited about. I envision many "trees down" reports when it's really a dead branch on someone's lawn.

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Storms probably become widespread this afternoon given the location of the 250mb jet streak.

Weak mid level flow and paltry lapse rates will keep convection from becoming widespread severe.

Yeah lapse rates blow. They weren't half bad on the OKX sounding, but Albany sounding was horrible.

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