Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS11 KWNS 232338
SWOMCD
SPC MCD 232337
OKZ000-TXZ000-240100-

MESOSCALE DISCUSSION 0729
NWS STORM PREDICTION CENTER NORMAN OK
0637 PM CDT SAT MAY 23 2015

AREAS AFFECTED...SOUTHERN/CENTRAL OK AND NORTH TX

CONCERNING...TORNADO WATCH 197...

VALID 232337Z - 240100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 197 CONTINUES.

SUMMARY...HEAVY RAINFALL ASIDE...SHORT-TERM TORNADO THREAT WILL
LIKELY REMAIN MAXIMIZED ACROSS SOUTH-CENTRAL/EAST-CENTRAL OK THROUGH
EARLY/MID-EVENING. TORNADO WATCH 197 CONTINUES UNTIL 07Z...WHILE
ADDITIONAL PORTIONS OF EAST-CENTRAL OK MAY REQUIRE AN ADDITIONAL
TORNADO WATCH.

DISCUSSION...A COMPOSITE NORTHEAST-SOUTHWEST ORIENTED SQUALL LINE
CONTINUES TO SLOWLY SPREAD EAST-SOUTHEASTWARD ACROSS
NORTH-CENTRAL/SOUTHWEST OK AS OF 2330Z/630 PM CDT...WHILE OTHER
SEMI-DISCRETE STORMS CONTINUE TO QUICKLY DEVELOP/INTENSIFY TO THE
EAST-SOUTHEAST OF THE SQUALL LINE ACROSS SOUTH-CENTRAL/CENTRAL OK.
THESE SEMI-DISCRETE STORMS HAVE BEEN VERY QUICK TO ACQUIRE LOW-LEVEL
ROTATION INCLUDING A HISTORY OF SEVERAL TORNADOES IN AREAS TO THE
IMMEDIATE WEST/SOUTH OF THE OKC METRO AS OF 630 PM CDT. SCENARIO
WILL LIKELY REMAIN VERY FAVORABLE FOR AT LEAST TRANSIENT SUPERCELLS
WITH A TORNADO WITHIN A TROPICAL-LIKE AIR MASS CHARACTERIZED BY
LOWER 70S F SURFACE DEWPOINTS. LOW-LEVEL WINDS REMAIN BACKED TO
SOUTHEASTERLY EAST/SOUTHEAST OF THE SQUALL LINE...WHICH IS
CONTRIBUTING TO STRONG LOW-LEVEL SRH WITH LATEST WSR-88D VWP DATA
FROM KTLX INDICATING AROUND 350 M2/S2 OF 0-1 KM SRH.

..GUYER.. 05/23/2015

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

ATTN...WFO...TSA...FWD...OUN...

LAT...LON   34179951 35129831 35819736 36459609 36489521 34649489
            33169678 33379891 34179951



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