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2013 New England Severe General Discussion


Quincy

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mcd0751.gif

   MESOSCALE DISCUSSION 0751   NWS STORM PREDICTION CENTER NORMAN OK   1154 AM CDT TUE MAY 21 2013      AREAS AFFECTED...WRN/CNTRL NY...SRN NEW ENGLAND      CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE       VALID 211654Z - 211800Z      PROBABILITY OF WATCH ISSUANCE...40 PERCENT      SUMMARY...TSTMS SHOULD CONTINUE INCREASING IN INTENSITY...PRIMARILY   FOCUSED ALONG/S OF A QUASI-STATIONARY FRONT...ACROSS PORTIONS OF   WRN/CNTRL NY AND INTO SRN NEW ENGLAND THIS AFTERNOON. THE PRIMARY   THREATS WILL BE DMGG WIND GUSTS AND LARGE HAIL. A WW MAY BE NEEDED   IF CONVECTIVE TRENDS CONTINUE TO INCREASE.      DISCUSSION...SUBJECTIVE SFC ANALYSIS FROM 16Z PLACES A   QUASI-STATIONARY FRONT FROM NEAR ROC-ALB. A FEW STORMS HAVE RECENTLY   INITIATED ALONG THIS FRONT...LIKELY IN RESPONSE TO WEAK LOW-LEVEL   CONVERGENCE...WEAKENING CONVECTIVE INHIBITION...AND MODEST MIDLEVEL   MOISTENING/ASCENT AS NOTED ON WATER VAPOR. MODIFIED 12Z SOUNDINGS   FROM BOTH BUF AND ALB SUGGEST AMPLE INSTABILITY FOR THE DEVELOPMENT   OF STRONG-SVR TSTMS...WITH MLCAPE VALUES LIKELY EXCEEDING 2000   J/KG...GIVEN THE PRESENCE OF MODERATELY STEEP MIDLEVEL LAPSE RATES   AND RICH LOW-LEVEL MOISTURE. ADDITIONALLY...BOTH SOUNDING AND RECENT   VWP DATA SHOW NEARLY 30 KTS OF MIDLEVEL FLOW AND MODESTLY VEERING   WINDS WITH HEIGHT...SUPPORTIVE FOR ORGANIZED TSTM. COVERAGE OF TSTMS   IS SOMEWHAT UNCERTAIN GIVEN RELATIVELY WEAK FORCING FOR ASCENT...BUT   WITH THE POTENTIAL FOR LARGE HAIL AND DMGG WIND GUSTS...A WW MAY BE   REQUIRED SHOULD TRENDS CONTINUE TO INCREASE.

http://www.spc.noaa.gov/products/md/md0751.html

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Great SB CAPE right now..too bad we don't have any s/w trigger or wind shear. There is a little convergence with the sea-breeze, hopefully it's enough.

 

 

The shear really sucks right now south of roughly I-90. A brief pulser is probably all that would be supported right now. Def looks better up toward NW MA/S VT and NY State.

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The shear really sucks right now south of roughly I-90. A brief pulser is probably all that would be supported right now. Def looks better up toward NW MA/S VT and NY State.

Agreed Will. There's almost no directional 0-6km shear and there really isn't even much speed shear either.

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The main issue today is just a lack of a more pronounced trigger.  Shear really isn't all that bad with 30-35 knots of 0-6km shear...sure meso maps don't show much over CT but extreme northern CT is on the axis of this stronger shear which will help.  

 

 

At least lapse rates are pretty decent, so a short lived pulser may become strong or borderline severe for a time...but lack of shear def hurts...esp south of the pike. Maybe it gets a bit better later on.

 

Best combo of instability and shear is def NY State up near ALB and west along the thruway.

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