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 351
< Previous MD         Next MD >
MD 351 graphic

   MESOSCALE DISCUSSION 0351
   NWS STORM PREDICTION CENTER NORMAN OK
   1131 PM CDT FRI APR 17 2015

   AREAS AFFECTED...SW LA/SE TX COAST

   CONCERNING...SEVERE THUNDERSTORM WATCH 71...

   VALID 180431Z - 180530Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 71
   CONTINUES.

   SUMMARY...OVERALL SEVERE RISK HAS DIMINISHED AND MAY NOT INTENSIFY
   PRIOR TO 07Z WW EXPIRATION.

   DISCUSSION...PREVIOUSLY INTENSE MCS THAT PRODUCED SEVERE WEATHER
   OVER THE GALVESTON BAY AREA HAS SUBSTANTIALLY WEAKENED IN BOTH RADAR
   VELOCITIES AND OBSERVED WINDS IN OFFSHORE/INLAND SURFACE STATIONS.
   STILL...AN MCV IS IDENTIFIABLE IN REFLECTIVITY DATA OVER CALCASIEU
   PARISH LA. LCH VWP DATA HAS DEPICTED SOME WEAKENING OF DEEP-LAYER
   SHEAR OVER THE PAST FEW HOURS...BUT STILL SUFFICIENT TO MAINTAIN
   ORGANIZED STRUCTURES. IT APPEARS THE LEADING STRATIFORM RAINFALL IS
   HAVING DELETERIOUS EFFECTS ON INSTABILITY WHICH IN TURN IS LIMITING
   SEVERE WIND GUSTS. 

   UPSTREAM...RECENT AMDAR DATA INVOF HOUSTON METRO SUGGESTS THAT WEAK
   ELEVATED BUOYANCY PERSISTS IN THE WAKE OF THE SWRN LA MCS. BUT GIVEN
   THE EXTENSIVE EARLIER OVERTURNING AND MODIFICATION OF LAPSE
   RATES...THE RISK FOR SEVERE HAIL WILL PROBABLY REMAIN LOW.

   ..GRAMS.. 04/18/2015


   ATTN...WFO...LCH...HGX...

   LAT...LON   28869465 28939515 29139539 29419534 30049486 30329334
               30309252 30159206 29499172 29279179 29219187 28999358
               28869465 

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 18, 2015
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities