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July 2-3 severe weather and flash flooding


Ian

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includes your BY.

 

AREAS AFFECTED...MUCH OF CENTRAL/ERN NY...VT...WRN
MA/CT...CENTRAL/ERN PA...NRN/CENTRAL NJ...AND NRN MD

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 021428Z - 021530Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND STRENGTH
FROM WEST-EAST ACROSS PORTIONS OF THE NORTHEAST STATES THROUGH THE
MORNING INTO THE AFTERNOON. STRONG TO SEVERE STORMS WILL BE
LIKELY...PRODUCING DAMAGING WINDS AND HAIL. WW ISSUANCE IS LIKELY
BY LATE MORNING.

DISCUSSION...TRENDS IN MORNING WATER VAPOR IMAGERY SHOWED A
SHORTWAVE TROUGH TRACKING NEWD THROUGH THE LOWER GREAT LAKES
REGION...AND A SECOND UPSTREAM WAVE MOVING EWD THROUGH LOWER MI/NRN
IND. AN ATTENDANT BAND OF 50-60 KT SWLY 500 MB WINDS EXTENDS FROM
THE UPPER OH VALLEY TO SRN QUEBEC PER 12Z SOUNDINGS...WITH THESE
WINDS SPEEDS EXPECTED TO BE SUSTAINED THROUGH THE DAY AND SHIFT
SOMEWHAT EWD ACROSS THE DISCUSSION AREA...ENHANCING BULK SHEAR.
MOSAIC RADAR/VISIBLE SATELLITE IMAGERY AND LIGHTNING DATA SHOWED
CU/TCU AND A FEW CB DEVELOPMENT ALREADY UNDERWAY FROM WRN/CENTRAL PA
INTO CENTRAL NY AS THE BOUNDARY LAYER DESTABILIZES...GIVEN ABUNDANT
SURFACE HEATING PER MAINLY CLEAR SKIES IN THE PRE-CONVECTIVE
ENVIRONMENT.

OBJECTIVE ANALYSES INDICATED MUCH OF THE DISCUSSION AREA IS ALREADY
MODERATELY UNSTABLE AND UNCAPPED. THIS IS CONFIRMED PER
MODIFICATION OF THE 12Z ALB SOUNDING FOR CURRENT SURFACE TEMP/
DEWPOINT SHOWING NO INHIBITION AND MLCAPE NEAR 2000 J/KG. DESPITE
VERY WEAK HEIGHT FALLS...FURTHER DESTABILIZATION WITH THE AIR MASS
BECOMING STRONGLY UNSTABLE AND STRENGTHENING BULK SHEAR WILL SUPPORT
ORGANIZED STORMS FAVORING LINE SEGMENTS/DAMAGING WIND GUSTS.
TRANSIENT ROTATING STRUCTURES WILL ALSO BE POSSIBLE AS EFFECTIVE
BULK SHEAR INCREASES TO 35-45 KT FROM NEAR THE PA/MD BORDER NWD THIS
AFTERNOON.

..PETERS/CORFIDI.. 07/02/2014

MD to our north

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I'm assuming we are capped?

Not strongly but some remnant EML around still I think. It is supposed to wane as we go. In theory it could be an ideal setup but we may still struggle to get widespread convection right around here and south. 

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3000-4000 SBCAPE showing up already on SPC meso page at 14z... 1500-2000 MLCAPE... LI's -5 to -7... 1100-1200 DCAPE.

 

Wish we could hold on to the ML Lapse Rates of 6.5C/KM a bit longer

 

15z

 

4000 SBCAPE right over DCA... ~2500 MLCAPE... LI's -5 to -7

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