SPC MD 828

MD 0828 CONCERNING SEVERE THUNDERSTORM WATCH 227… FOR WRN/CNTRL SD

MESOSCALE DISCUSSION 0828
NWS STORM PREDICTION CENTER NORMAN OK
0711 PM CDT MON MAY 27 2013

AREAS AFFECTED...WRN/CNTRL SD

CONCERNING...SEVERE THUNDERSTORM WATCH 227...

VALID 280011Z - 280145Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 227
CONTINUES.

SUMMARY...ISOLATED SEVERE HAIL/WIND HAZARDS WILL CONTINUE NEXT FEW
HOURS...FOCUSED ALONG THE I-90 CORRIDOR. WW 227 HAS BEEN LOCALLY
EXTENDED TO 04Z. ADDITIONAL WW ISSUANCE IS UNLIKELY.

DISCUSSION...PRIMARY SEVERE THREAT REMAINS ALONG SRN PORTION OF SLOW
EWD-MOVING QLCS. RECENT INCREASE IN REFLECTIVITY WITH UPDRAFT IN
HAAKON COUNTY HAS LIKELY BEEN A RESULT OF MERGING OUTFLOW/CONVECTION
ORIGINALLY S/SE OF THE QLCS. WITH 30-35 KT OF MID-LEVEL SWLYS
SAMPLED IN THE 00Z KRAP RAOB AND RESIDUAL STEEP LOW-LEVEL LAPSE
RATES WHERE SURFACE TEMPERATURES HAD WARMED THROUGH THE
70S...SEMI-ORGANIZED UPDRAFTS SHOULD PERSIST NEXT FEW HOURS CAPABLE
OF ISOLATED SEVERE HAIL/WIND. WITH THE PLAINS LLJ FOCUSED INTO THE
MCS ALONG THE S-CNTRL NEB/N-CNTRL KS BORDER...OVERALL SEVERE THREAT
SHOULD WANE AS THE BOUNDARY LAYER COOLS THIS EVENING.

..GRAMS.. 05/28/2013

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

ATTN...WFO...ABR...LBF...UNR...CYS...

LAT...LON   43390370 43900346 44700247 45030165 45660061 45800022
            45739970 45259943 42910007 42820168 43020364 43390370

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