MESOSCALE DISCUSSION 0562
   NWS STORM PREDICTION CENTER NORMAN OK
   0223 PM CDT MON APR 16 2012
   
   AREAS AFFECTED...DEEP SOUTH TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 181...
   
   VALID 161923Z - 162030Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 181
   CONTINUES.
   
   SEVERE WEATHER THREAT ACROSS DEEP SOUTH TX /PRIMARILY ERN HALF OF
   WFO BRO COUNTY WARNING AREA/ IS EXPECTED TO EXTEND BEYOND
   20Z...RESULTING IN THE POTENTIAL FOR A LOCAL TEMPORAL EXTENSION OF
   WW 181.  IN ADDITION TO THE SEVERE WEATHER THREAT...HEAVY RAINFALL
   RATES EXCEEDING 1.5-2.0 INCH PER HOUR ARE LIKELY TO PERSIST AS
   STORMS TRAIN ENEWD ALONG A SLOW SWD MOVING BOUNDARY.
   
   TRENDS IN REGIONAL RADAR IMAGERY AND SURFACE OBSERVATIONS INDICATED
   A SLOW SWD MOVING CONVECTIVE OUTFLOW BOUNDARY...WHICH AT 1910Z
   EXTENDED FROM THE TX COAST /55 S CRP/ WSWWD TO NRN STARR COUNTY /OR
   40 NNW MFE/ WHERE IT INTERSECTED A N-S BOUNDARY.  MODERATE
   INSTABILITY...A MOIST AIR MASS /PW VALUES EXCEEDING 1.5 INCH/...AND
   EFFECTIVE BULK SHEAR OF 30-40 KT SUPPORT ADDITIONAL TSTMS /MULTICELL
   AND SUPERCELL STORM MODES/ THROUGH THE REST OF THE AFTERNOON AS THE
   SURFACE BOUNDARY ADVANCES SWD.  HAIL AND LOCALLY DAMAGING WINDS WILL
   REMAIN THE PRIMARY SEVERE THREATS.
   
   ..PETERS.. 04/16/2012
   
   
   ATTN...WFO...CRP...BRO...
   
   LAT...LON   26159865 27039840 27419734 27629682 26949693 25919670
               25839739 25979771 26009823 26159865