[MCD] SWOMCD

[Mesoscale Convective Discussions]

ACUS11 KWNS 201516
SWOMCD
SPC MCD 201515 
TXZ000-201615-

MESOSCALE DISCUSSION 0579
NWS STORM PREDICTION CENTER NORMAN OK
1015 AM CDT THU APR 20 2006

AREAS AFFECTED...W TX

CONCERNING...SEVERE THUNDERSTORM WATCH 218...219...

VALID 201515Z - 201615Z

CONTINUE WW 219.  PARTS OF WW 218 MAY BE EXTENDED LOCALLY ANOTHER
COUPLE OF HOURS.

MAIN UPSTREAM SOUTHERN BRANCH IMPULSE IS JUST NOW PROGRESSING INTO
THE SOUTHERN ROCKIES...AND ZONE OF STRONGER ISENTROPIC ASCENT IS
EXPECTED TO PERSIST FROM AREAS EAST OF THE TEXAS BIG BEND INTO WEST
CENTRAL TEXAS INTO EARLY AFTERNOON.  THIS EXTENDS FROM JUST NORTH OF
STALLED SURFACE FRONT...NEAR/SOUTH OF THE DEL RIO/SAN ANTONIO AREAS
...INTO THE VICINITY OF STRONGER MID-LEVEL BAROCLINIC ZONE ACROSS
NORTH CENTRAL TEXAS.  THOUGH NOT STRONG...SOUTHERLY LOW-LEVEL JET IS
TRANSPORTING HIGH PRECIPITABLE WATER AIR MASS NORTHWARD OUT OF THE
LOWER RIO GRANDE VALLEY...CONTRIBUTING TO CAPE OF 1000-2000 J/KG
ABOVE FRONTAL INVERSION ACROSS WEST TEXAS.  MOST VIGOROUS
STORMS...WITH LARGEST HAIL POTENTIAL...SEEM LIKELY TO REMAIN FOCUSED
IN CLOSER PROXIMITY TO FRONT...NORTH/NORTHEAST OF DEL RIO THROUGH
18Z.  HOWEVER...MORE MARGINAL SEVERE HAIL THREAT MAY BE SLOW TO
DIMINISH IN AREAS TO THE NORTH..

..KERR.. 04/20/2006

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...EWX...SJT...LUB...MAF...

30170182 30950250 31750256 32570207 33100112 33170055
33209995 32859941 32539889 32029915 31259985 30639964
30129947 29639986 29610053 29930147 

WWWW