Marine Weather and Tide Forecast for Garden City, ID

FXUS65 KBOI 150929 CCA AFDBOI

Area Forecast Discussion National Weather Service Boise ID 315 AM MDT Sun Jun 15 2025

SHORT TERM
Today through Tuesday night...With a strong ridge centered over the desert southwest and troughing observed over the e-Pacific, OR and ID will be sandwiched into warm southwest flow aloft today into Monday. A very weak disturbance will spread broken high clouds over the area throughout the day, but temperatures are still expected to rise 5 degrees above normal by this afternoon. By mid-day Monday, a shortwave Pacific trough will move inland and support a 10-25% probability of high- based showers and thunderstorms ahead/along a weak cold front.
Current hi-res ensemble guidance suggests 35-45 mph outflows could generate from storm activity. Outside of storms, winds will shift to northwest and become gusty Monday afternoon/evening with the cold front. Zonal flow will then develop Tuesday behind the trough, with the return to dry and mostly clear conditions.

LONG TERM
Wednesday through Sunday...The ridge residing over the desert southwest will build northward over the Intermountain West Wednesday through Friday, placing E Oregon and SW Idaho back into the warm southwest flow regime. Toward the end of the week, a stronger trough will enter the Pacific Northwest and bring a prominent cold front through the forecast area Friday- Saturday. The chance of showers and thunderstorms will increase (20-40%) over the weekend for the northern areas, with lower chances closer to the NV border. Strong, gusty surface winds are expected to develop from the tightening pressure gradient with the cold front. Temperatures are currently forecast to lower 10 degrees by Friday and an additional 10 degrees by Saturday/Sunday.
In correlation, snow levels are also forecast to lower over the weekend, potentially dipping as low as 5500-6500 feet MSL.
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