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Wednesday April 20 2011: Potential severe weather and warmth


earthlight

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SPC now has a 2% Tor. risk for the area.

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1123 AM CDT WED APR 20 2011

VALID 201630Z - 211200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM PARTS OF TX EWD ACROSS THE

GULF COAST STATES...

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE

NORTHEAST...

...NORTHEAST/MID ATLANTIC...

SHORTWAVE TROUGH AND ASSOCIATED CORRIDOR OF 12-HR HEIGHT FALLS

EXCEEDING 100-150 M AT 500 MB WILL TRANSLATE FROM THE GREAT LAKES

AND OH VALLEY NEWD THROUGH NEW ENGLAND AND THE ST. LAWRENCE VALLEY

TODAY. ASSOCIATED SURFACE LOW OVER SWRN ONTARIO AS OF 16Z WILL

CONCURRENTLY DEVELOP NEWD INTO FAR SRN QUEBEC BY 21/00Z WITH

TRAILING COLD FRONT MOVING INTO THE HUDSON AND DE RIVER VALLEYS BY

THIS TIME. WARM FRONT IS EXPECTED TO LIFT NWD THROUGH AT LEAST THE

LOWER HUDSON VALLEY BY LATE AFTERNOON/EARLY EVENING.

MORNING VISIBLE SATELLITE IMAGERY INDICATES BREAKS IN THE CLOUDS

AHEAD OF THE COLD FRONT ACROSS NY/PA WHICH SHOULD ALLOW FOR STRONGER

DIABATIC HEATING. WHEN COUPLED WITH BOUNDARY LAYER DEWPOINTS IN THE

50S...EXPECT AFTERNOON MLCAPE OF 500-1000 J/KG. LATEST MESOSCALE

AND CONVECTION-ALLOWING MODEL GUIDANCE SUGGEST THAT WEAK CONVERGENCE

ALONG THE COLD FRONT MAY LIMIT STORM COVERAGE THIS AFTERNOON INTO

EVENING. GIVEN THE STRONG WLY WIND FIELD IN PLACE...ANY STORMS THAT

CAN DEVELOP WILL BE CAPABLE OF DAMAGING WIND GUSTS AND PERHAPS A

BRIEF TORNADO.

...OK...

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Interesting, SPC shrunk back the eastward extend of the slight risk area again. With steep mid-level lapse rates I think more than a 5% hail risk would have been warranted. There were numerous reports of small hail with the line that moved through New England eariler.

Yeah, but the SPC Hail outlook isn't for small hail.

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00z spc wrf not enthused with this event at all, it has practically nothing..Dynamics may be solid but we need more juice imo

i stand by this.

radar looks exactly like the 00z spc wrf from last night and it has everything dying out. Anything severe the pops will be isolated if the dynamics can find some moisture to work with..There is alot of forcing with the front but its moistured starved and the PW isnt great.

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