Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
216 PM MDT Mon Aug 5 2024

.DISCUSSION...The Northern Rockies will remain under southwesterly
upper level flow through Tuesday. A few subtle disturbances will
track through this flow pattern causing clusters of rain showers
and thunderstorms for the next 24-36 hours. The atmosphere appears
to be unstable enough for the remainder of this afternoon and
evening and once again on Tuesday afternoon to allow for the
development of some strong to potentially severe thunderstorms.

A low pressure system will slide into south central Canada by mid
week causing the upper level flow to become westerly to
northwesterly. This flow pattern will keep temperatures near
seasonal with the potential of steady precipitation along the
Continental Divide, especially around Glacier National Park. While
the remainder of the region could experience periods of isolated
to scattered showers and thunderstorms.

The low pressure from Canada will drop into the upper Midwest by
the latter part of the week. This movement of the low will allow
for the ridge of high pressure to slowly strengthen over the
western United States. This ridge will allow for a warming and
drying trend through the weekend.

&&

.AVIATION...
One disturbance is currently causing numerous showers and
thunderstorms to move through western Montana this afternoon. A
second round of convection is starting to develop over northeast
Oregon and southern Idaho. These storms should make their way into
north central Idaho and west central Montana later this evening. A
third round of storms is expected Tuesday morning. These storms
will be capable of gusty erratic winds, moderate to heavy rain and
small hail.

&&

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

&&

Special Weather Statement
National Weather Service Missoula MT
510 PM PDT Mon Aug 5 2024

IDZ006>008-060100-
Southern Clearwater Mountains ID-
Lower Hells Canyon/Salmon River Region ID-
Orofino/Grangeville Region ID-
510 PM PDT Mon Aug 5 2024

...A strong thunderstorm will impact portions of west central Idaho
County through 600 PM PDT...

At 510 PM PDT, Doppler radar was tracking a strong thunderstorm 15
miles west of White Bird, or 26 miles southwest of Grangeville,
moving northeast at 25 mph.

HAZARD...Wind gusts up to 50 mph and half-inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
White Bird, Copperville, and Canfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4604 11645 4577 11616 4565 11649 4575 11654
      4578 11660 4578 11666 4579 11668 4582 11669
      4583 11674
TIME...MOT...LOC 0010Z 228DEG 23KT 4576 11662

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

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