Skip Navigation Links 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

Mesoscale Discussion 921
< Previous MD         Next MD >
MD 921 graphic

   Mesoscale Discussion 0921
   NWS Storm Prediction Center Norman OK
   0303 PM CDT Tue May 30 2017

   Areas affected...Central PA into central and parts of eastern NY

   Concerning...Severe Thunderstorm Watch 299...

   Valid 302003Z - 302200Z

   The severe weather threat for Severe Thunderstorm Watch 299

   SUMMARY...Severe-weather threat continues across central
   Pennsylvania into mainly central New York, while the northeast part
   of WW 299 should maintain a limited severe storm potential, given a
   more stable environment.  Damaging winds and hail remain the primary
   severe-weather risk with the strongest storms.

   DISCUSSION...Trends in satellite, surface observations and WSR-88D
   VWP data indicated a decidedly veered wind field across western PA
   into western NY, with a narrow theta-e axis has shifted east into
   central PA to central NY.  Mosaic radar imagery showed the ongoing
   strong to severe storms were located within this moist and unstable
   environment with MLCAPE up to around 500 J/kg.  Despite marginal
   instability, strong bulk shear will continue to favor organized
   storms with damaging winds and hail as the primary threats.  The
   overall severe-weather threat will remain limited with eastward
   extent due to extensive low-level clouds into eastern PA to the
   northeast part of WW 299 in eastern NY, where instability is quite

   ..Peters.. 05/30/2017

   ...Please see for graphic product...


   LAT...LON   39777856 40877836 42017787 43007726 43657617 44287570
               44047502 43957421 43727336 43097320 42867359 42927430
               42537486 42107555 41747617 40847687 39777696 39727789
               39757851 39777856 

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
Page last modified: May 30, 2017
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities