Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
221 PM MDT Fri Jul 14 2017

...Thunderstorms with gusty winds Saturday...

.DISCUSSION...Moisture that was previously in Nevada is moving
north through southern Idaho and will help initiate a few gusty
thunderstorms later this afternoon and evening. Simulated radar
loops show most of the thunderstorms to move through Lemhi County
and southwest Montana but some of the outflow winds could make it
to Missoula this evening.

Saturday remains the day with the highest potential for
widespread thunderstorms. A few storms may move through northwest
Montana during the morning, but the afternoon is the main focus
for strong storms region-wide. Gusty winds and lightning are the
main threats with storms but brief heavy rain and small hail will
also become possible by the late afternoon.

Sunday will be around 10 degrees cooler than Saturday due to the
passage of a cold front. Winds are expected to become gusty by
Sunday afternoon as well, so fire weather conditions may become
critical in portions of the region.

Much drier air is expected with the cold front passage which will
lead to cool temperatures Monday morning.

Near normal to slightly above normal temperatures are still
expected next week as the upper level ridge flattens.
Thunderstorms are possible on Monday but Tuesday now looks to have
lower thunderstorm chances.

&&

.AVIATION...A plumb of monsoon moisture is moving through southern
Idaho and into southwest Montana this afternoon. Thunderstorms are
beginning to develop in the aforementioned areas and will continue
through the evening. The main threats with today's thunderstorms
are lightning and gusty winds. A few storms may produce wind
gusts over 50kts with the main threat between 14/2200Z-15/0400Z.
Although most shower activity will diminish after sunset, another
weak disturbance may set off isolated showers and thunderstorms
early Saturday morning mainly north of I-90.

&&

.FIRE WEATHER...An area of thunderstorms is expected to sweep
north this evening...across mainly the eastern Clearwater mountain
and areas east and southeast of that. Gusty winds can be expected
with these storms. For Saturday, deep moisture will be present,
resulting in more thunderstorms, but a better chance of rainfall
with them. By Sunday, a cooler and breezy westerly flow will
develop with drier air returning to the area.

&&

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

Special Weather Statement
National Weather Service Missoula MT
359 PM MDT FRI JUL 14 2017

MTZ007-142245-
Butte/Blackfoot Region MT-
359 PM MDT FRI JUL 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DEER LODGE...NORTH
CENTRAL SILVER BOW AND SOUTHERN POWELL COUNTIES UNTIL 445 PM MDT...

At 359 PM MDT, Doppler radar was tracking a thunderstorm over
Anaconda, moving east at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Anaconda, West Valley, Warm Springs, Gregson Hot Springs, Lost Creek,
Crackerville and Opportunity.

LAT...LON 4599 11303 4616 11313 4629 11282 4604 11268
TIME...MOT...LOC 2159Z 248DEG 9KT 4610 11299

Special Weather Statement
National Weather Service Missoula MT
616 PM MDT FRI JUL 14 2017

MTZ004>006-043-150045-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
Lower Clark Fork Region MT-Potomac/Seeley Lake Region MT-
616 PM MDT FRI JUL 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL MISSOULA COUNTY
UNTIL 645 PM MDT...

At 616 PM MDT, Doppler radar was tracking a thunderstorm 8 miles
southwest of Wye, or 11 miles west of Missoula, moving northeast at
15 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Missoula, Lolo, Bonner-West Riverside, Wye, East Missoula and Evaro.

LAT...LON 4672 11429 4687 11443 4711 11400 4688 11379
TIME...MOT...LOC 0016Z 235DEG 15KT 4685 11424

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