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.
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