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Possible late season severe outbreak morning of 10/8/14


CoastalWx

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...DELMARVA/NJ TO SRN NEW ENGLAND...

FORECASTER CONFIDENCE HAS INCREASED /INCLUDING COLLABORATION WITH

WFO/S MT HOLLY...UPTON AND BOSTON/ FOR A SLIGHT RISK OF ISOLATED TO

SCATTERED SEVERE STORMS NERN NJ THROUGH LONG ISLAND /INCLUDING NYC/

INTO SRN NEW ENGLAND DURING THE LAST 6 HOURS OF THIS FORECAST

PERIOD. THIS CONFIDENCE IS BASED ON THE CURRENT STRENGTH OF AN

OBSERVED WLY 500-MB JET OF 80 KT AT JACKSON KY EARLY THIS EVENING

PER THE VAD. STRONG DEEP LAYER ASCENT WITHIN THE EXIT REGION OF

THIS JET WILL MOVE INTO NRN DELMARVA BY 06Z AND THEN INTO LONG

ISLAND AND SRN NEW ENGLAND BY 12Z. THIS MIDLEVEL JET AND AN

EXPECTED STRENGTHENING SSWLY LLJ UP TO 50-60 KT FROM THE

MID-ATLANTIC STATES TO SRN NEW ENGLAND LATER TONIGHT WILL OCCUR AS

THE CURRENT UPPER OH VALLEY SHORTWAVE TROUGH BECOMES NEGATIVELY

TILTED OVER NY TO SRN NEW ENGLAND BY 12Z. THE STRENGTHENING WIND

FIELDS WILL RESULT IN STRONG DEEP-LAYER SHEAR AND INCREASING

LOW-LEVEL SHEAR FOR DISCRETE ROTATING STORMS AND BOWING SEGMENTS

AND/OR QLCS DEVELOPMENT. 23Z RAP SOUNDINGS FROM THE VICINITY OF NYC

AT 07Z INDICATED EFFECTIVE SRH AROUND 250 M2/S2 WITH SIMILAR VALUES

INTO SOUTHEAST MA /NEAR NEW BEDFORD/ BY 12Z. THIS FACTOR SUPPORTS

THE TORNADO THREAT...WHILE STRONG WINDS JUST OFF THE SURFACE WILL

FAVOR THE THREAT FOR DAMAGING WINDS.

00Z UPTON NY SOUNDING INDICATED SURFACE DEW POINTS IN THE LOWER 60S

WITH PARCELS BEING SURFACE-BASED. STRENGTHENING OF THE LLJ INTO

THIS REGION IS EXPECTED TO SUSTAIN THE LIKELIHOOD FOR STORMS TO BE

SURFACE BASED...WITH MUCAPE ALREADY AROUND 600 J/KG. FURTHER

DESTABILIZATION IS LIKELY LATER TONIGHT SUPPORTING TSTM DEVELOPMENT.

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...DELMARVA/NJ TO SRN NEW ENGLAND...

FORECASTER CONFIDENCE HAS INCREASED /INCLUDING COLLABORATION WITH

WFO/S MT HOLLY...UPTON AND BOSTON/ FOR A SLIGHT RISK OF ISOLATED TO

SCATTERED SEVERE STORMS NERN NJ THROUGH LONG ISLAND /INCLUDING NYC/

INTO SRN NEW ENGLAND DURING THE LAST 6 HOURS OF THIS FORECAST

PERIOD. THIS CONFIDENCE IS BASED ON THE CURRENT STRENGTH OF AN

OBSERVED WLY 500-MB JET OF 80 KT AT JACKSON KY EARLY THIS EVENING

PER THE VAD. STRONG DEEP LAYER ASCENT WITHIN THE EXIT REGION OF

THIS JET WILL MOVE INTO NRN DELMARVA BY 06Z AND THEN INTO LONG

ISLAND AND SRN NEW ENGLAND BY 12Z. THIS MIDLEVEL JET AND AN

EXPECTED STRENGTHENING SSWLY LLJ UP TO 50-60 KT FROM THE

MID-ATLANTIC STATES TO SRN NEW ENGLAND LATER TONIGHT WILL OCCUR AS

THE CURRENT UPPER OH VALLEY SHORTWAVE TROUGH BECOMES NEGATIVELY

TILTED OVER NY TO SRN NEW ENGLAND BY 12Z. THE STRENGTHENING WIND

FIELDS WILL RESULT IN STRONG DEEP-LAYER SHEAR AND INCREASING

LOW-LEVEL SHEAR FOR DISCRETE ROTATING STORMS AND BOWING SEGMENTS

AND/OR QLCS DEVELOPMENT. 23Z RAP SOUNDINGS FROM THE VICINITY OF NYC

AT 07Z INDICATED EFFECTIVE SRH AROUND 250 M2/S2 WITH SIMILAR VALUES

INTO SOUTHEAST MA /NEAR NEW BEDFORD/ BY 12Z. THIS FACTOR SUPPORTS

THE TORNADO THREAT...WHILE STRONG WINDS JUST OFF THE SURFACE WILL

FAVOR THE THREAT FOR DAMAGING WINDS.

00Z UPTON NY SOUNDING INDICATED SURFACE DEW POINTS IN THE LOWER 60S

WITH PARCELS BEING SURFACE-BASED. STRENGTHENING OF THE LLJ INTO

THIS REGION IS EXPECTED TO SUSTAIN THE LIKELIHOOD FOR STORMS TO BE

SURFACE BASED...WITH MUCAPE ALREADY AROUND 600 J/KG. FURTHER

DESTABILIZATION IS LIKELY LATER TONIGHT SUPPORTING TSTM DEVELOPMENT.

Looks like if anything materializes you might be in a good location
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I know right? A chase out in the corn fields must be fun, but 2 am at home with the kids tucked in?

Thankfully my town can barely hold a thunderstorm together.

Close call though, Mansfield had their first tornado in ages last year...

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HRRR looks rather fun for RI and SE MA.

A few runs now have showed some robust updrafts swinging through the area. Could be a couple of rounds of storms too.

 

As of 10, dews are generally 60-63F across SE MA and most of RI. Even seeing a due E wind at WST and SE at GON. I imagine if we're going to have a legit severe potential SE of I-95 in New England, it almost has to happen in late summer/early fall to actually thrive off of a marine influence.

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A few runs now have showed some robust updrafts swinging through the area. Could be a couple of rounds of storms too.

As of 10, dews are generally 60-63F across SE MA and most of RI. Even seeing a due E wind at WST and SE at GON. I imagine if we're going to have a legit severe potential SE of I-95 in New England, it almost has to happen in late summer/early fall to actually thrive off of a marine influence.

my recollection of the few severe events are of overnight early AM timeframes. Worst always came in off the ocean not land.
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