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Potential Major Storm 9/18


NEG NAO

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Looks like some broad rotation north of High Bridge even on the KDIX radar. NROT data on GR2AE shows it weakened now just west of Califon.

that storm just northeast of philly looks to be packing quite the punch as well. not much rotation but looks very healthy nonetheless. the squall line as whole looks among the healthiest ive seen this year so far

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MESOSCALE DISCUSSION 1972

NWS STORM PREDICTION CENTER NORMAN OK

0508 PM CDT TUE SEP 18 2012

AREAS AFFECTED...NJ...DE

CONCERNING...TORNADO WATCH 643...

VALID 182208Z - 182315Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 643 CONTINUES.

SUMMARY...WW 643 IS SCHEDULED TO EXPIRE AT 23Z. GIVEN THE PRESENCE

OF A DOWNSTREAM WW 646 IN WFO OKX/ALY AREAS...A LOCAL TEMPORAL

EXTENSION FOR WFO PHI IS RECOMMENDED.

DISCUSSION...LEADING EDGE OF LEAD CONVECTIVE LINE EXTENDED FROM

AROUND 25 SE MSV S/SWWD TO 20 E NHK. BASED ON CURRENT EXTRAPOLATION

THIS LINE DOES NOT APPEAR LIKELY TO CLEAR NJ/DE PRIOR TO 23Z WW

EXPIRATION. GIVEN 35-45 KT 0-1 KM SHEAR SAMPLED IN AREA VWP DATA AND

GENERALLY MIDDLE 70S SURFACE TEMPERATURES...SETUP WILL REMAIN

FAVORABLE FOR AREAS OF DAMAGING WINDS WITH STRONG WIND GUSTS /REF 38

KT AT KPHL AT 2154Z/ AND POTENTIALLY A BRIEF TORNADO OR TWO BEFORE

PUSHING OFF THE COAST.

..GRAMS.. 09/18/2012

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There was never any surface heating where the line is now. No sun whatsoever.

Well with the loss of surface heat, they might. But with the increasing LLJ, that helps to support lots of lift considering the fact that we are also in the right entrance region of a powerful jet. This is not like the 8th with respect to losing kinematic support.

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