Squall Line could hit NYC around Rush Hour
Posted by JAC on 6/9/2011, 2:53 pm


MESOSCALE DISCUSSION 1154
  NWS STORM PREDICTION CENTER NORMAN OK
  1245 PM CDT THU JUN 09 2011
 
  AREAS AFFECTED...MUCH OF THE NORTHEASTERN URBAN CORRIDOR...FROM
  WASHINGTON D.C./BALTIMORE INTO THE BOSTON AREA
 
  CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
 
  VALID 091745Z - 091915Z
 
  MUCH OF THE NORTHEASTERN URBAN CORRIDOR IS BEING MONITORED FOR A NEW
  SEVERE WEATHER WATCH ISSUANCE...WHICH MAY BE NEEDED BY 19-20Z.
 
  STRONG/SEVERE STORM DEVELOPMENT IS NOW WELL UNDERWAY ACROSS UPSTATE
  NEW YORK...IN ADVANCE OF A COLD FRONT ASSOCIATED WITH LARGE-SCALE
  TROUGHING SLOWLY ADVANCING EASTWARD ACROSS EASTERN CANADA...AND EAST
  OF THE LOWER GREAT LAKES REGION.  AIDED BY MODEST DEEP LAYER
  WESTERLY FLOW /20-30 KT/...UPSCALE CONVECTIVE GROWTH APPEARS LIKELY
  DURING THE NEXT FEW HOURS...AS IT SPREADS EASTWARD INTO A MOIST AND
  INCREASINGLY STRONGLY HEATED BOUNDARY LAYER NEAR PRE-FRONTAL
  TROUGHING IN THE VICINITY OF THE URBAN CORRIDOR.  A CONSOLIDATING
  AND STRENGTHENING SURFACE COLD POOL ASSOCIATED WITH AN EVOLVING
  SQUALL LINE PROBABLY WILL BE ACCOMPANIED BY STRONG...POTENTIALLY
  DAMAGING WIND GUSTS.  IT APPEARS THAT THIS MAY IMPACT THE GREAT NEW
  YORK CITY METROPOLITAN AREA AND WESTERN/CENTRAL MASSACHUSETTS BY
  21-22Z...THE BOSTON AREA SHORTLY THEREAFTER...AND PERHAPS
  PHILADELPHIA/SOUTHERN NEW JERSEY INTO THE BALTIMORE AND WASHINGTON
  D.C. AREA TOWARD 23-00Z.
 
  ..KERR.. 06/09/2011
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Squall Line could hit NYC around Rush Hour - JAC, 6/9/2011, 2:53 pm
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