Marine Weather and Tide Forecast for Bellevue, ID

SHORT TERM /THROUGH MONDAY NIGHT/
Issued at 222 PM MDT Sun Apr 20 2025

Early afternoon satellite imagery shows a cold front dropping south through the northern Rockies with a mix of showers, thunderstorms, and gusty winds. Showers are currently ongoing across the eastern Highlands and are expected to expand in coverage this evening into the overnight hours as the cold front works directly overhead. Isolated to scattered showers and a 10-30% chance of thunderstorms will continue into Monday morning as best chances shift northeast to the Eastern Highlands by Monday afternoon as dry conditions build in southwest to northeast. Dry conditions are then favored to return regionwide for Monday night into Tuesday as lingering showers around Yellowstone dissipate as a drier airmass builds in. Given cooler temperatures this front, we are looking at a mix of rain and snow showers with best snow chances above 5500 to 6000 feet.
Total precipitation accumulations through Monday will remain light in that T-0.25" range with the higher end of that range expected in the Eastern and Southern Highlands east of I-15. Any snow accumulations will also remain light, confined to our higher elevations, in that T-2" range.

Winds out there today are already breezy out ahead of the cold front with gusts peaking today around 25-40 mph. Winds are expected to remain elevated overnight tonight before even stronger winds build in for Monday where wind gusts will peak around 30-50 mph, locally higher to 50-60 mph. As a result, a Wind Advisory has been issued from 9 AM to 9 PM MDT Monday for the Snake River Plain, Eastern Magic Valley, and Raft River Region where the strongest of winds are expected with gusts up to 50 mph possible. Elsewhere outside of this advisory, winds will still remain breezy with gusts to around 30-40 mph.
Following sunset on Monday, winds will rapidly subside with light winds expected Monday night into Tuesday.

Temperatures today will remain near normal to above normal with highs reaching the 50s/60s. Even with tonight cold front, highs tomorrow will only be running about 3-6 degrees colder in the 40s/50s.

LONG TERM /TUESDAY THROUGH SATURDAY/
Issued at 222 PM MDT Sun Apr 20 2025

Extended period begins with a shift to a near zonal flow for Tuesday and a beginning of a warming trend through the end of the work week. By Wednesday, the next in a series of shortwave troughs shifts through the region, providing a renewed chance for showers and possibly even a thunderstorm or two. For the remainder of the extended period, the ensemble clusters generally agree on trending toward a deeper trough shifting into the western states. However, clusters range from a split trough with a stronger southern low to a much colder consolidated closed low nudging into the PacNW. The means favor a transitory ridge that still holds some moisture, so continues the threat of showers over the region. Friday appears to be the warmest day of the week, but trough axis shifts closer so the trend is for increasing shower threat into the weekend, with temps dropping off slightly for both Saturday and Sunday.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/
Issued at 610 PM MDT Sun Apr 20 2025

Gusty winds to continue through the period as system swinging by overnight. All TAFs to remain VFR with some lowering decks and chance of showers from 03z to 12z. Post frontal gusty westerly winds to be the main weather factor for tomorrow with some localized areas of dust. Will not place that in the TAFs for now.



PIH WATCHES/WARNINGS/ADVISORIES
Wind Advisory from 9 AM to 9 PM MDT Monday for IDZ051>057.