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This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Possible rain across the northeast portion of Montana beginning Sunday afternoon and lasting overnight.
- Sustained winds of 20 mph with potential gusts to 40 mph will likely result in conditions reaching Lake Wind Advisory criteria Sunday afternoon and Monday afternoon.
- A chance(10-30%) for showers overnight Tuesday and into Wednesday.
DISCUSSION
An approaching upper-level low will continue transporting moisture into region, producing cloudy skies Saturday and possible rain across the northeast portion of Montana beginning Sunday afternoon and lasting overnight. Precipitation totals will range between 0.01" and 0.25".
Sustained winds of 20 mph with potential gusts to 40 mph associated with the passage of the aforementioned low will likely result in conditions reaching Lake Wind Advisory criteria. Rough conditions will begin late Sunday afternoon with a SE wind, relax overnight, and resume for the duration of Monday with a W to NW wind. Wave heights have the potential to reach 4.5'.
Tuesday Moving Forward: A weak ridging pattern will take place over Montana, although a brief influx of moisture will pose chances for showers overnight Tuesday and into Wednesday. There is uncertainty on rain amounts, but expect less than 0.05" at any given location as of the latest forecast. Beyond Tuesday, skies are anticipated to clear while temperatures warm slightly under continued weak ridging.
FORECAST CONFIDENCE & DEVIATIONS: There is moderate confidence in rain amounts through Tuesday.
There is moderate to high confidence of sustained winds at or above 20 mph on Sunday and Monday across Fort Peck Lake.
DON/GAH
AVIATION
LAST UPDATED: 0530Z
FLIGHT CAT RANGE: VFR
DISCUSSION: Expect low-level ceilings to scatter out and rise through this evening and overnight. A broken to overcast layer will redevelop late Saturday morning between 5,000' and 8,000' AGL and hold into Saturday evening. Then conditions will begin a slow clearing from north to south Sunday morning.
WIND: W-NW at 5 to 10 kt this evening. Becoming light and variable early Saturday morning through the rest of the day and into the evening.
DON/GAH
GGW WATCHES/WARNINGS/ADVISORIES
None.
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