Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 270956
SWOMCD
SPC MCD 270956
LAZ000-TXZ000-271200-

MESOSCALE DISCUSSION 0478
NWS STORM PREDICTION CENTER NORMAN OK
0456 AM CDT MON APR 27 2015

AREAS AFFECTED...EAST TX/UPPER TX COASTAL PLAIN TO WESTERN/SOUTHERN
LA

CONCERNING...TORNADO WATCH 125...

VALID 270956Z - 271200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 125 CONTINUES.

SUMMARY...DAMAGING WIND AND ISOLATED TORNADO/SOME HAIL POTENTIAL
WILL CONTINUE ACROSS EAST TX/UPPER TX COASTAL PLAIN INTO
WESTERN/SOUTHERN LA THROUGH THE EARLY/MID-MORNING HOURS. TORNADO
WATCH 125 CONTINUES UNTIL 14Z. A NEW WATCH WILL LIKELY BE NEEDED
ACROSS LA EARLY THIS MORNING.

DISCUSSION...EARLIER QUASI-SEPARATE SQUALL LINES/BOW ECHOS OVER
NORTHEAST/EAST-CENTRAL/SOUTH-CENTRAL TX HAVE ESSENTIALLY MERGED AND
UNIFIED INTO A SEMI-SINGULAR EAST-SOUTHEASTWARD MOVING SQUALL LINE
WITH EMBEDDED BOWS/MESOVORTICES ACROSS EAST TX/UPPER TX COASTAL
PLAIN AS OF 0945Z/0445AM CDT. A 54 KT MEASURED WIND GUST WAS
RECENTLY /0935Z/ NOTED AT CONROE /KCXO/. SEVERE-CALIBER DAMAGING
WINDS WILL REMAIN A CONCERN THIS MORNING...ALONG WITH THE
POSSIBILITY OF TORNADOES VIA EMBEDDED CIRCULATIONS/MESOVORTICES AMID
RELATIVELY STRONG EFFECTIVE SRH.

AHEAD OF THE SQUALL LINE...LOW-LEVEL STORM RELATIVE INFLOW APPEARS
TO HAVE INCREASED OVER THE PAST FEW HOURS...RELATED TO NEAR-SURFACE
EASTERLIES AND A BACKING/SOMEWHAT STRENGTHENING TREND OF 20-30 KT
SOUTHEASTERLY WINDS IN THE LOWEST 2 KM AGL ACROSS WESTERN LA AS PER
WSR-88D VWP DATA FROM FT POLK/LAKE CHARLES. FACTORS SUCH AS
THIS...ALONG WITH A PROBABLE SYSTEM-TRAILING MCV AND
MOIST/RELATIVELY UNSTABLE ENVIRONMENT NEAR/SOUTHWEST A WNW-ESE
FRONT...ARE LIKELY TO SUPPORT AN EAST-SOUTHEASTWARD SUSTENANCE OF A
STRONG/SEVERE SQUALL LINE INTO WESTERN/SOUTHERN LA THROUGH AT LEAST
MID-MORNING.

..GUYER.. 04/27/2015

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

ATTN...WFO...LIX...LCH...SHV...HGX...

LAT...LON   32019506 32369437 32119306 30479132 29519173 29619404
            29299498 29629577 30319545 32019506



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