Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
211 PM MDT Sun Jun 4 2017

.DISCUSSION...An approaching cold front, presently over Oregon
and Washington, will slowly approach the Northern Rockies through
this evening. As it does, increasing wind shear will interact with
an atmosphere that continues to moisten and grow unstable this
afternoon, something that is already apparent by the ongoing
thunderstorm activity across Lemhi County and much of SW Montana.
As the atmosphere grows increasingly favorable for thunderstorms,
so too will the potential for severe thunderstorms with the chief
threats being wind gusts in excess of 50 mph and hail around 1
inch in diameter. These storms will continue to affect the area
through this evening with the threat for strong/severe storms
persisting until around 10pm. Thereafter rain showers are likely
to linger overnight with some locations seeing some moderate
precipitation under the stronger convective precipitation cores.

Monday will be a pleasant early June day with temperatures running
near normal and the atmosphere showing continued signs of drying.
The exception to this will be in NW Montana and along the
Continental Divide where wrap around moisture will keep scattered
showers and cloudiness present throughout the day. Monday will
also start a warming and drying trend to last through mid week.
By Wednesday temperatures will be 15 to 20 degrees above average
with highs in the upper 80s to low 90s. Thursday will be another
hot day, with an increasing chance of thunderstorms ahead of the
next cold front.

Friday will mark the passage of a cold front with active, wet
weather including thunderstorms. By Saturday and Sunday, afternoon
temperatures will be in the upper 50s and 60s.&&

.AVIATION...A strong cold front is moving across the northern
Rockies today causing thunderstorms. Mainly showers and isolated
thunderstorms are expected behind the front and to affect terminal
KGPI. Further south and east affecting terminals KMSO, KBTM, and
KSMN some storms may be severe this afternoon and evening. Winds
over 50 knots are the most likely impact from strong
thunderstorms, and terminal KMSO is most likely to be affected
followed by KBTM. There is also a chance of some large hail over 1
inch in size with these storms. Expect storms to move east of the
Continental Divide around 06Z.

&&

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

Special Weather Statement
National Weather Service Missoula MT
449 PM MDT SUN JUN 4 2017

MTZ007-043-042315-
Butte/Blackfoot Region MT-Potomac/Seeley Lake Region MT-
449 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MISSOULA...NORTH
CENTRAL GRANITE AND WESTERN POWELL COUNTIES UNTIL 515 PM MDT...

At 449 PM MDT, Doppler radar was tracking a strong thunderstorm 17
miles northwest of Drummond, moving north at 15 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Garnet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4671 11342 4675 11357 4693 11352 4686 11326
TIME...MOT...LOC 2249Z 199DEG 15KT 4681 11344

Special Weather Statement
National Weather Service Missoula MT
510 PM MDT SUN JUN 4 2017

IDZ005-006-MTZ004-006-042345-
Southern Clearwater Mountains ID-Northern Clearwater Mountains ID-
Bitterroot/Sapphire Mountains MT-Lower Clark Fork Region MT-
510 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN IDAHO...EASTERN
CLEARWATER...SOUTHEASTERN MINERAL AND SOUTHWESTERN MISSOULA COUNTIES
UNTIL 545 PM MDT/445 PM PDT/...

At 510 PM MDT/410 PM PDT/, Doppler radar was tracking a strong
thunderstorm 26 miles west of Victor, or 31 miles northwest of
Hamilton, moving north at 35 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Lolo Pass, Lolo Hot Springs and Powell.

LAT...LON 4642 11458 4647 11483 4682 11476 4679 11438
TIME...MOT...LOC 2310Z 195DEG 29KT 4653 11468

Special Weather Statement
National Weather Service Missoula MT
511 PM MDT SUN JUN 4 2017

MTZ007-043-050000-
Butte/Blackfoot Region MT-Potomac/Seeley Lake Region MT-
511 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL MISSOULA AND
NORTHWESTERN POWELL COUNTIES UNTIL 600 PM MDT...

At 510 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles south of Seeley Lake, or 24 miles northwest of Drummond, moving
north at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Greenough and Clearwater.

LAT...LON 4684 11340 4685 11353 4705 11351 4700 11327
TIME...MOT...LOC 2310Z 187DEG 23KT 4696 11344

Special Weather Statement
National Weather Service Missoula MT
512 PM MDT SUN JUN 4 2017

MTZ004>006-043-042345-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
Lower Clark Fork Region MT-Potomac/Seeley Lake Region MT-
512 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL MISSOULA AND NORTH
CENTRAL RAVALLI COUNTIES UNTIL 545 PM MDT...

At 512 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles west of Florence to near Woodside.
Movement was northeast at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Missoula, Hamilton, Lolo, Stevensville, Victor, Florence, East
Missoula, Woodside, Pinesdale, Bell Crossing and Corvallis.

LAT...LON 4615 11426 4664 11427 4705 11394 4641 11393
TIME...MOT...LOC 2312Z 214DEG 24KT 4663 11422 4629 11421

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