Monday, July 15, 2013

MESO: Mesoscale Discussion 1402

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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