Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
208 PM MDT Mon Jul 10 2017

.DISCUSSION...An approaching disturbance is causing the strong
ridge of high pressure to finally break down. This feature is also
the kicker for convection across Lemhi county into southwest
Montana. The combination of significant instability and more wind
shear will contribute to stronger storms across the
aforementioned region. These storms will be capable of hail, gusty
winds and brief heavy rain.

A few showers will linger throughout the night along the
Continental Divide. Westerly flow will persist over the northern
Rockies through Tuesday keeping the temperatures cooler to near
normal readings.

The heatwave returns by Wednesday, and will last through the
weekend and into early next week. In fact, each day will warm by
5 to 7 degrees or so, with Friday, Saturday, and Sunday topping
out as the hottest days during this particular stretch.
Temperatures will have the potential to reach 100 degrees in valleys
across western Montana and central Idaho on Friday, with an even
greater chance of hitting 100 degrees, or slightly higher
(102-105F), both Saturday and Sunday.

With such strong high pressure locked in place across the western
half of the United States, our forecast models show no
foreseeable break in this hot and dry pattern through at least
July 20th.

&&

.AVIATION...
Scattered to numerous showers and thunderstorms will continue to
develop across Lemhi county into southwest Montana. A few of these
storms could become fairly strong, producing gusty winds, hail and
brief heavy rain. KSMN and KBTM have the best chance of being
impacted by these storms through 11/03z. A few showers will be
traversing northwest Montana this afternoon and evening, but
having a minimal impact to KGPI. A few showers could linger along
the Continental Divide throughout the night.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

Special Weather Statement
National Weather Service Missoula MT
420 PM MDT MON JUL 10 2017

MTZ007-102245-
Butte/Blackfoot Region MT-
420 PM MDT MON JUL 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SILVER BOW COUNTY UNTIL
445 PM MDT...

At 419 PM MDT, Doppler radar was tracking a strong thunderstorm near
Silver Bow, or 7 miles southwest of Butte, moving northeast at 35
mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations impacted include...
Butte, Silver Bow, Walkerville, Janney, Newcomb and Nissler.

LAT...LON 4586 11243 4579 11263 4594 11278 4612 11251
      4610 11247 4607 11247 4605 11248 4602 11244
      4593 11244 4593 11242 4589 11240
TIME...MOT...LOC 2219Z 234DEG 31KT 4592 11262

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