ACUS11 KWNS 152240
SWOMCD
SPC MCD 152239
NDZ000-MTZ000-152345-
MESOSCALE DISCUSSION 1402
NWS STORM PREDICTION CENTER NORMAN OK
0539 PM CDT MON JUL 15 2013
AREAS AFFECTED...NERN MT...FAR NWRN ND
CONCERNING...TORNADO WATCH 415...
VALID 152239Z - 152345Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 415 CONTINUES.
SUMMARY...INTENSE SUPERCELL OVER ROOSEVELT COUNTY MT MAY BE YIELDING
A LONG-LIVED TORNADO AS IT GRADUALLY TRACKS EWD ACROSS NERN MT.
DISCUSSION...INTENSE MESOCYCLONE WITH A HISTORY OF TORNADO REPORTS
IS GENERALLY PARALLELING THE US-2 CORRIDOR BY ABOUT 20 MILES TO THE
NORTH IN ROOSEVELT COUNTY MT. ENVIRONMENTAL PARAMETERS WILL REMAIN
FAVORABLE FOR POTENTIAL MAINTENANCE OF THIS STRONG SUPERCELL...GIVEN
SMALLER DOWNSTREAM SURFACE TEMPERATURE/DEW POINT SPREADS AND
STRONGER LOW-LEVEL SLYS. OWING TO THE LACK OF CONVECTION TO ITS
IMMEDIATE S...SETUP MAY YIELD A SLOW-MOVING LONG-DURATION TORNADO
THAT COULD EVENTUALLY REACH THE MT HWY 16 CORRIDOR.
..GRAMS.. 07/15/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BIS...GGW...
LAT...LON 48950387 48580353 48150371 48060468 48120542 48630554
48960501 48950387
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