Marine Weather and Tide Forecast for Lakeside, MT
 | Sunrise 5:52 AM Sunset 9:14 PM Moonrise 12:36 AM Moonset 8:22 AM |
7 Day Forecast for Marine Location Near Lakeside, MT
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FXUS65 KMSO 172022 AFDMSO
Area Forecast Discussion National Weather Service Missoula MT 222 PM MDT Sat May 17 2025
DISCUSSION
KEY MESSAGES:
- Wet system to bring moderate precipitation rates tonight into Sunday
- Moderate to high confidence in accumulating snow for the higher terrain down to 4500 feet, including mountains passes
- 20 to 30 percent chance for accumulating snow down to 3500 feet for Missoula valley, Mission valley and Seeley/Swan valleys Sunday morning
All the models are still in fair alignment about a mid level circulation moving through the Northern Rockies tonight into Sunday. This circulation will bring widespread precipitation with snow levels lowering to around 4500 feet by late Sunday morning.
The latest consensus of the models have the heaviest precipitation tracking across Idaho County into west central Montana late tonight into Sunday morning. Then the precipitation traverses up into northwest Montana with decent upslope flow along the Continental Divide, around Glacier NP, by Sunday afternoon.
Confidence is still high for widespread 0.25 to 0.75 inches of precipitation across the region, with the aforementioned region receiving 0.5 to 1.5 inches of precipitation by Sunday evening.
The higher terrain across north central Idaho up towards Glacier NP is expected to receive 4 to 10 inches of new snow above 6000 feet, while the mountain passes should receive 2 to 4 inches by Sunday afternoon. Many winter storm warnings and advisories have been issued for the areas that will receive the biggest impact from this storm system. Snow levels could still be pushed down to around 3500 feet on Sunday which could allow for some light snow accumulations on the valley benches of western Montana.
A subtle transitory ridge slides through the region Sunday night into Monday causing a respite in the precipitation, but it will be short lived. The upper level flow quickly transitions to a west to northwest trajectory allowing for the development of scattered to numerous showers across the Northern Rockies late Monday into Tuesday.
Another weak ridge slides through the region on Wednesday allowing for a warming and dry trend. Then, circulation slides through the Northern Rockies on Thursday bring widespread precipitation. Snow levels will remain relatively high during this event, so rain will be the main precipitation type. This active weather pattern is expected to persist into the weekend. The majority (~70%) of the long term models are showing a large ridge of high pressure developing over the region Sunday into the first part of next week.
AVIATION
Some light-to-moderate turbulence has been reported near and above FL320 with similar conditions persisting if not slightly worsening over the next 24 hours across the south and eastern half of the regional airspace.
Shower chances increase from south to north this evening especially near and after 18/0100z. There is a chance for thunderstorms south of I-90 prior to 18/0600z. Anticipate deteriorating visibility, lowering ceilings, and terrain obscurations throughout the night with showers lasting through much of the morning. Snow levels will gradually decrease toward 4500 ft MSL by Sunday morning. There is the potential for a heavier band of precipitation to establish itself somewhere near the I-90 corridor during the early morning hours which could help briefly push down snow levels close to valley floors. West winds will increase by Sunday afternoon sustaining near 15 knots at ridgetops with frequent gusts to near 30.
MSO WATCHES/WARNINGS/ADVISORIES
MT...Winter Storm Warning from 3 AM to 3 PM MDT Sunday for Bitterroot/Sapphire Mountains...Potomac/Seeley Lake Region.
Winter Weather Advisory from 6 AM to 6 PM MDT Sunday for West Glacier Region.
Winter Weather Advisory from 3 AM to 3 PM MDT Sunday for Butte/Blackfoot Region.
ID...Winter Storm Warning from 3 AM MDT /2 AM PDT/ to 3 PM MDT /2 PM PDT/ Sunday for Eastern Lemhi County...Southern Clearwater Mountains...Western Lemhi County.
Area Forecast Discussion National Weather Service Missoula MT 222 PM MDT Sat May 17 2025
DISCUSSION
KEY MESSAGES:
- Wet system to bring moderate precipitation rates tonight into Sunday
- Moderate to high confidence in accumulating snow for the higher terrain down to 4500 feet, including mountains passes
- 20 to 30 percent chance for accumulating snow down to 3500 feet for Missoula valley, Mission valley and Seeley/Swan valleys Sunday morning
All the models are still in fair alignment about a mid level circulation moving through the Northern Rockies tonight into Sunday. This circulation will bring widespread precipitation with snow levels lowering to around 4500 feet by late Sunday morning.
The latest consensus of the models have the heaviest precipitation tracking across Idaho County into west central Montana late tonight into Sunday morning. Then the precipitation traverses up into northwest Montana with decent upslope flow along the Continental Divide, around Glacier NP, by Sunday afternoon.
Confidence is still high for widespread 0.25 to 0.75 inches of precipitation across the region, with the aforementioned region receiving 0.5 to 1.5 inches of precipitation by Sunday evening.
The higher terrain across north central Idaho up towards Glacier NP is expected to receive 4 to 10 inches of new snow above 6000 feet, while the mountain passes should receive 2 to 4 inches by Sunday afternoon. Many winter storm warnings and advisories have been issued for the areas that will receive the biggest impact from this storm system. Snow levels could still be pushed down to around 3500 feet on Sunday which could allow for some light snow accumulations on the valley benches of western Montana.
A subtle transitory ridge slides through the region Sunday night into Monday causing a respite in the precipitation, but it will be short lived. The upper level flow quickly transitions to a west to northwest trajectory allowing for the development of scattered to numerous showers across the Northern Rockies late Monday into Tuesday.
Another weak ridge slides through the region on Wednesday allowing for a warming and dry trend. Then, circulation slides through the Northern Rockies on Thursday bring widespread precipitation. Snow levels will remain relatively high during this event, so rain will be the main precipitation type. This active weather pattern is expected to persist into the weekend. The majority (~70%) of the long term models are showing a large ridge of high pressure developing over the region Sunday into the first part of next week.
AVIATION
Some light-to-moderate turbulence has been reported near and above FL320 with similar conditions persisting if not slightly worsening over the next 24 hours across the south and eastern half of the regional airspace.
Shower chances increase from south to north this evening especially near and after 18/0100z. There is a chance for thunderstorms south of I-90 prior to 18/0600z. Anticipate deteriorating visibility, lowering ceilings, and terrain obscurations throughout the night with showers lasting through much of the morning. Snow levels will gradually decrease toward 4500 ft MSL by Sunday morning. There is the potential for a heavier band of precipitation to establish itself somewhere near the I-90 corridor during the early morning hours which could help briefly push down snow levels close to valley floors. West winds will increase by Sunday afternoon sustaining near 15 knots at ridgetops with frequent gusts to near 30.
MSO WATCHES/WARNINGS/ADVISORIES
MT...Winter Storm Warning from 3 AM to 3 PM MDT Sunday for Bitterroot/Sapphire Mountains...Potomac/Seeley Lake Region.
Winter Weather Advisory from 6 AM to 6 PM MDT Sunday for West Glacier Region.
Winter Weather Advisory from 3 AM to 3 PM MDT Sunday for Butte/Blackfoot Region.
ID...Winter Storm Warning from 3 AM MDT /2 AM PDT/ to 3 PM MDT /2 PM PDT/ Sunday for Eastern Lemhi County...Southern Clearwater Mountains...Western Lemhi County.
Link to 1 hour of 5 minute data for KGPI
Terminal Aerodrome Forecast (TAF) for KGPI
Wind History Graph: GPI
(wind in knots)
GEOS Local Image of Pacific Northwest
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