000
ACUS11 KWNS 240252
SWOMCD
SPC MCD 240251
SDZ000-NDZ000-NEZ000-240345-

MESOSCALE DISCUSSION 1734
NWS STORM PREDICTION CENTER NORMAN OK
0951 PM CDT FRI SEP 23 2016

AREAS AFFECTED...PORTIONS OF WESTERN SD

CONCERNING...SEVERE THUNDERSTORM WATCH 487...

VALID 240251Z - 240345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 487
CONTINUES.

SUMMARY...THE SEVERE THREAT ACROSS WW 487 WILL CONTINUE TO RAPIDLY
DIMINISH THIS EVENING.

DISCUSSION...A LINE OF STORMS OVER WESTERN SD WILL CONTINUE TO TRACK
NORTH/NORTHEAST THIS EVENING...THOUGH THE SEVERE THREAT APPEARS TO
BE DIMINISHING RAPIDLY. INSTABILITY HAS DECREASED TO AROUND 500 J/KG
PER 02Z MESOANALYSIS AS THE BOUNDARY LAYER CONTINUES TO COOL AND
STABILIZE. THE REGION CONTINUES TO BE UNDER THE INFLUENCE OF STRONG
DEEP-LAYER SHEAR...AND FAST STORM MOTION COULD RESULT IN SOME GUSTY
/BUT SUB-SEVERE/ WINDS FOR A COUPLE MORE HOURS. A DOWNSTREAM WATCH
WILL NOT BE ISSUED AND WW 487 WILL EXPIRE AT 04Z.

..LEITMAN.. 09/24/2016

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

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

LAT...LON   45970307 45930205 45010125 43000120 42980316 45410320
            45970307