Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS11 KWNS 020045
SWOMCD
SPC MCD 020045
MTZ000-WYZ000-IDZ000-UTZ000-NVZ000-020145-

MESOSCALE DISCUSSION 0860
NWS STORM PREDICTION CENTER NORMAN OK
0745 PM CDT MON JUN 01 2015

AREAS AFFECTED...CENTRAL/SOUTHERN MONTANA...NORTHWESTERN
WYOMING...SOUTHEASTERN IDAHO...AND FAR NORTHERN UTAH

CONCERNING...SEVERE THUNDERSTORM WATCH 245...246...

VALID 020045Z - 020145Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
245...246...CONTINUES.

SUMMARY...SEVERE THREAT CONTINUES FOR WWS 245 AND 246...ALTHOUGH
LARGE PARTS OF THE WATCH AREAS HAVE STABILIZED DUE TO PREVIOUS
CONVECTIVE OVERTURNING.

DISCUSSION...A BROKEN LINE OF STRONG TO OCCASIONALLY SEVERE STORMS
CONTINUES ACROSS PARTS OF CENTRAL/SOUTHERN MONTANA AND NORTHWESTERN
WYOMING...WITH A COUPLE OF SUPERCELL STRUCTURES NOTED NEAR MEAGHER
AND WHEATLAND COUNTIES IN MONTANA WITHIN THE PAST HOUR. THE SEVERE
THREAT WILL PERSIST ACROSS THESE AREAS...MAINLY WITH STORMS ALONG
LEADING EDGE OF EWD-MOVING MATURE COLD POOL GIVEN SUPPORTIVE
SHEAR/INSTABILITY IN AREAS IMMEDIATELY DOWNSTREAM. A GRADUAL
DECREASE IN SEVERITY OF STORMS MAY OCCUR IN NORTHWESTERN WYOMING IN
THE WAKE OF PREVIOUS CONVECTION THAT STABILIZED THAT AREA...BUT A
RECENT 45 KNOT WIND GUST AT KJAC SUGGESTS THAT A SEVERE THREAT WILL
STILL REMAIN ON AT LEAST AN ISOLATED BASIS.

FARTHER TO THE SOUTHWEST...A COUPLE OF ISOLATED STORMS MAY AFFECT
AREAS NEAR CASSIA COUNTY IDAHO OVER THE NEXT 1-2 HOURS...ALTHOUGH
AREAS NORTHEAST OF THESE STORMS HAVE STABILIZED DUE TO OVERTURNING
FROM PREVIOUS CONVECTION. MUCH OF WW 246 MAY BE CANCELLED WELL
BEFORE THE SCHEDULED EXPIRATION AT 03Z AS ANY RESIDUAL SEVERE THREAT
THERE SHOULD REMAIN ISOLATED.

..COOK.. 06/02/2015

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

ATTN...WFO...BYZ...GGW...RIW...TFX...SLC...PIH...BOI...LKN...

LAT...LON   43601089 43991072 44611031 45321006 46121019 46641050
            46911112 47201162 47571149 47711120 47761020 47660832
            47320801 46710781 45840784 45220798 44580823 44080875
            43690941 43500992 43041044 42501081 42091114 41851165
            41761251 41711333 41711384 41741420 41911432 42181421
            42241407 42391366 42401313 42441236 42801158 43311100
            43601089



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