000
ACUS11 KWNS 190345
SWOMCD
SPC MCD 190344
OKZ000-190415-

MESOSCALE DISCUSSION 0688
NWS STORM PREDICTION CENTER NORMAN OK
1044 PM CDT SAT MAY 18 2013

AREAS AFFECTED...A PORTION OF S-CNTRL / CNTRL / AND NERN OK

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 190344Z - 190415Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...THE THREAT FOR CONVECTIVELY-INDUCED SEVERE WIND GUSTS
CAPABLE OF ISOLD POCKETS OF WIND DAMAGE WILL PROBABLY CONTINUE FOR
THE NEXT SEVERAL HOURS.  A NEW SEVERE THUNDERSTORM WATCH IS BEING
CONSIDERED FOR PORTIONS OF OK.

DISCUSSION...A CLUSTER OF ELEVATED TSTMS LOCATED FROM THE WICHITA
MTNS TO THE OKC METRO AND RECENT ADDITIONAL STORM DEVELOPMENT IN
OSAGE COUNTY CONTINUES TO LEND A THREAT FOR STRONG-SEVERE WIND
GUSTS.  DESPITE A GUST FRONT SURGING WELL AHEAD OF THE ONGOING STORM
CLUSTER...THE CONVECTIVE DOWNDRAFTS CONTINUE TO PENETRATE TO THE
SURFACE IN THE FORM OF STRONG-SEVERE MEASURED WIND GUSTS PER
MULTIPLE OK MESONET OBSERVATIONS.  GIVEN THE VERY STEEP LAPSE RATE
ENVIRONMENT COUPLED WITH A 50+ KT LLJ...EVAPORATIVE COOLING
PROCESSES WILL BE CONDUCIVE FOR SPORADIC DOWNDRAFT BURSTS TO
PROBABLY CONTINUE TO FACILITATE POCKETS OF DAMAGING-CAPABLE WIND
GUSTS.

..SMITH/CORFIDI.. 05/19/2013

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

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

LAT...LON   34739877 35609747 36789679 36989544 36409546 35069582
            34649679 34739877