Skip Navigation Links weather.gov 
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


 
USA.gov is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

Mesoscale Discussion 638
< Previous MD         Next MD >
MD 638 graphic
   
   MESOSCALE DISCUSSION 0638
   NWS STORM PREDICTION CENTER NORMAN OK
   0550 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...WRN/CNTRL NY...CNTRL/ERN PA
   
   CONCERNING...TORNADO WATCH 236...
   
   VALID 272250Z - 272345Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 236 CONTINUES.
   
   TORNADO/DAMAGING WIND THREAT PERSISTS WITHIN THIN QLCS STRETCHING
   FROM MONROE COUNTY NY TO BLAIR COUNTY PA AS OF 2240Z AND DISCRETE
   CELLS OUT AHEAD OF THIS LINE IN CNTRL PA. DESPITE LINE ORIENTATION
   NEARLY PARALLEL TO THE DEEP-LAYER FLOW...LOW-LEVEL SHEAR REMAINS
   QUITE STRONG WITH 0-1 KM SRH AOA 300 M2/S2 AND IS EXPECTED TO
   STRENGTHEN FURTHER THROUGH THE EVENING. THIS MAY COMPENSATE FOR THE
   LOSS OF DIURNAL HEATING WITH UPPER 50S TO MIDDLE 60S SURFACE DEW
   POINTS PRESENT DOWNSTREAM. IF TSTM ACTIVITY IS ABLE TO BE MAINTAINED
   AS IT APPROACHES THE ERN EXTENT OF THE WW...A NEW WW ISSUANCE MAY
   BECOME NECESSARY IN THE 00-02Z TIME FRAME.
   
   ..GRAMS.. 04/27/2011
   
   
   ATTN...WFO...BTV...ALY...PHI...BGM...BUF...CTP...LWX...
   
   LAT...LON   42007513 40237526 39687567 39447668 39637812 40507852
               42487801 43887754 44537659 44537576 44327521 43567494
               42007513 
   
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.
spc.feedback@noaa.gov
Page last modified: April 27, 2011
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities