Sunday, July 17, 2011

MESO: Mesoscale Discussion 1644

ACUS11 KWNS 172334
SWOMCD
SPC MCD 172334
MNZ000-SDZ000-NDZ000-180030-

MESOSCALE DISCUSSION 1644
NWS STORM PREDICTION CENTER NORMAN OK
0634 PM CDT SUN JUL 17 2011

AREAS AFFECTED...SERN ND...NERN SD

CONCERNING...TORNADO WATCH 652...

VALID 172334Z - 180030Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 652 CONTINUES.

ISOLATED LONG-LIVED TORNADIC SUPERCELL...LOCATED OVER LAMOURE COUNTY
ND...IS PROPAGATING SSEWD AT ROUGHLY 20KT. THIS STORM IS A BIT
DEVIANT TO FORECAST STORM MOTION AND BASED ON CURRENT SPEED/MOVEMENT
SHOULD SPREAD ACROSS DICKEY COUNTY ND INTO BROWN/MARSHALL COUNTY SD
BEFORE 01Z. THIS MAY NECESSITATE A NEW TORNADO WATCH OVER NERN SD
AS ENVIRONMENTAL CONDITIONS ARE QUITE UNSTABLE AND MORE THAN
ADEQUATELY SHEARED FOR SUPERCELLS/TORNADOES.

..DARROW.. 07/17/2011

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

ATTN...WFO...FGF...ABR...BIS...

LAT...LON 46749856 46239680 45559627 45059672 45019797 45969931
46749856

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