Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS11 KWNS 241613
SWOMCD
SPC MCD 241612
TXZ000-OKZ000-241815-

MESOSCALE DISCUSSION 0433
NWS STORM PREDICTION CENTER NORMAN OK
1112 AM CDT FRI APR 24 2015

AREAS AFFECTED...PARTS OF TX FROM THE CONCHO VALLEY/BIG COUNTRY INTO
CENTRAL AND N TX

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 241612Z - 241815Z

PROBABILITY OF WATCH ISSUANCE...80 PERCENT

SUMMARY...STORMS ARE FORECAST TO CONTINUE GRADUALLY INCREASING IN
BOTH COVERAGE AND INTENSITY OVER THE NEXT FEW HOURS....ALONG AND S
OF THE ONGOING CONVECTIVE BAND OVER NRN TX.  WW WILL LIKELY BE
ISSUED IN THE NEXT 1-2 HOURS.

DISCUSSION...A COMPLEX SCENARIO IS UNFOLDING ATTM ACROSS TX --
PARTICULARLY WITH RESPECT TO CONVECTIVE DETAILS...AS WIDESPREAD
CONVECTION IS ONGOING WITHIN A BAND FROM NEAR MAF ENEWD ACROSS N TX
AND INTO AR.  THE CONVECTION AND ASSOCIATED CLOUD COVER WILL
CONTINUE TO LOCALLY HINDER HEATING/DESTABILIZATION..BUT CLEARING IS
EVIDENT ATTM ALONG SRN FRINGES OF THIS ACTIVITY SUPPORTING GRADUAL
DESTABILIZATION OF THE MOIST BOUNDARY LAYER IN PLACE OVER CENTRAL
TX.

RADAR/VIS IMAGERY SHOWS ELEVATED STORMS NOW INCREASING IN COVERAGE
OVER WRN PORTIONS OF THE DISCUSSION AREA...AS MID-LEVEL HEIGHTS
CONTINUE TO FALL IN RESPONSE TO THE VORT MAX/CIRCULATION CENTER
SHIFTING NEWD ACROSS NM ATTM PER LATEST WV IMAGERY.  AS THIS
LARGE-SCALE BACKGROUND ASCENT SPREADS EWD ATOP A GRADUALLY
DESTABILIZING ENVIRONMENT...EXPECT STORMS TO BECOME INCREASINGLY
ROOTED IN THE DESTABILIZING BOUNDARY LAYER WITH TIME.

WITH 60 TO 70 KT SWLY FLOW ACCOMPANYING THE NM VORT MAX CONTINUING
TO SPREAD ACROSS THE SRN PLAINS...A KINEMATIC ENVIRONMENT VERY
SUPPORTIVE OF ORGANIZED STORMS WILL SUPPORT A GRADUAL RAMP-UP IN
SEVERE RISK AS STORMS BECOME SURFACE-BASED.  A MIXED CONVECTIVE MODE
IS EXPECTED...WITH LIKELY TENDENCY FOR SUPERCELLS TO IN SOME AREAS
GROW UPSCALE INTO MULTIPLE LINE SEGMENTS/BOWS.  THUS...LARGE HAIL
AND DAMAGING WINDS CAN BE EXPECTED...ALONG WITH A FEW TORNADOES
WHERE CELLULAR CONVECTIVE MODE CAN BE MAINTAINED.

THOUGH TIMING OF THE ONSET OF SEVERE RISK IS STILL A BIT
UNCERTAIN...WE WILL CONTINUE TO MONITOR EVOLUTION OF STILL-ELEVATED
CONVECTION WITH AN EYE TOWARD EXPECTED WW ISSUANCE IN THE NEXT 1-2
HOURS.

..GOSS/GRAMS.. 04/24/2015

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

ATTN...WFO...SHV...FWD...OUN...SJT...LUB...MAF...

LAT...LON   31300105 31960110 33050017 33939698 33929603 33089545
            31899594 31399791 31170005 31300105




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