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T-Storms Part 2 : "North and West of the city!"


TalcottWx

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Mesoscale Discussion 1448

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mcd1448.gif


MESOSCALE DISCUSSION 1448

NWS STORM PREDICTION CENTER NORMAN OK

0516 PM CDT WED JUL 23 2014

AREAS AFFECTED...SERN NY...ERN PA...NRN NJ...WRN CT...WRN MA...SRN

VT...NH AND ERN ME

CONCERNING...SEVERE THUNDERSTORM WATCH 432...

VALID 232216Z - 232345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 432

CONTINUES.

SUMMARY...ISOLATED INSTANCES OF STRONG TO DAMAGING WIND GUSTS WILL

PERSIST THROUGH EARLY EVENING FROM SERN NY...ERN PA...NRN NJ AND

PORTIONS OF NEW ENGLAND...BUT AN OVERALL DECREASE IS EXPECTED BY

00Z.

DISCUSSION...EXPANSIVE SQUALL LINE FROM ERN MAINE SWWD THROUGH SERN

NY AND ERN PA WILL CONTINUE TO POSE A THREAT FOR ISOLATED STRONG TO

DAMAGING WIND GUSTS AS IT DEVELOPS SEWD AT 20-25 KT NEXT COUPLE

HOURS. THE ATMOSPHERE DOWNSTREAM IS MODERATELY UNSTABLE WITH

1500-2000 J/KG MLCAPE...BUT MODEST LAPSE RATES AND WEAK VERTICAL

SHEAR ARE SERVING AS LIMITING FACTORS FOR A MORE SUBSTANTIAL SEVERE

THREAT. THREAT IS EXPECTED TO DECREASE FURTHER BY 00Z WITH ONSET OF

NOCTURNAL COOLING AND AS STORMS MOVE INTO SRN NEW ENGLAND WHERE THE

BOUNDARY LAYER HAS BEEN RENDERED LESS UNSTABLE BY THE INFLUENCE OF

THE MARINE LAYER.

..DIAL.. 07/23/2014

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Way late for this but GYX did a special 18z sounding today.  Looks like the llv lapse rates modeled did in fact come to pass, and the m/l aren't bad either.  Windfield isn't especially notable however. GYX.gif

 

llvl wind field is quite meh...mlvl's pretty respectable, especially given the thermodynamic environment.  Speed shear is present but not great given the weak llvl's.  Definte warm layers present though throughout the column...not a big deal for up that way though given stronger forcing and lift.

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With LIS water temp of 76? And maximized instability? Won't be much severe but a solid light show to the coast seems likely

tHREAT IS EXPECTED TO DECREASE FURTHER BY 00Z WITH ONSET OF   NOCTURNAL COOLING AND AS STORMS MOVE INTO SRN NEW ENGLAND WHERE THE   BOUNDARY LAYER HAS BEEN RENDERED LESS UNSTABLE BY THE INFLUENCE OF   THE MARINE LAYER.

:whistle:

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The HRRR keeps MUcape values in the 1000-1500 J/KG range well into the overnight so storms could sustain and become more elevated.  However, typically with nocturnal convection you would also like to have dynamical support to help maintain storms and we will lack that so I'm not sure how much the MUcapes will help.  

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