Marine Weather and Tide Forecast for Boise City, ID

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7 Day Forecast for Marine Location Near Boise City, ID

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Area Discussion for - Boise, ID

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FXUS65 KBOI 290254 AFDBOI

Area Forecast Discussion National Weather Service Boise ID 854 PM MDT Sun May 28 2023

DISCUSSION
Only isolated showers and a thunderstorm or two are all that remain in the SW Idaho highlands and in SE Oregon this evening. The showers and thunderstorms will continue to subside and end by midnight. Southwest flow aloft on Monday will draw more moisture out of Nevada and into our area near the Nevada border for a better chance (30-60 percent) of afternoon showers and thunderstorms. Elsewhere, the convection will be isolated and generally limited to the higher elevations. Temperatures will be warmer with highs 5 to 10 degrees above normal. No updates.

AVIATION
VFR. Skies will become mostly clear this evening and overnight as storms fade around/after sunset. Winds will be terrain driven and light area-wide. Another round of afternoon/early evening showers and thunderstorms possible over the mountains on Memorial Day, generally isolated in nature. Best chance for impacts, 20-30% chance, will be at BKE and TWF after 19Z. Mountains obscured near heavier showers and storms. Surface winds: generally variable less than 10 knots. Gusty and erratic outflows up to 30kt near thunderstorms. Winds aloft at 10k feet MSL: W-NW 10- 15kt.

PREV DISCUSSION
SHORT TERM
Tonight through Tuesday night
With one upper low exiting east into western MT and another upper low heading south from northern California, weather in our CWA has been much quieter than yesterday as of 2 PM MDT, with main showers and thunderstorms along the NV border and only isolated showers elsewhere. Models target southern Twin Falls County and se Owyhee County for the main showers and thunderstorms this evening with only isolated showers and thunderstorms elsewhere, ending in all areas around sunset. Monday will be much like today but slightly warmer with both upper lows farther out of the area. Main showers and possible afternoon thunderstorms will again be along the ID/NV border. Showers and thunderstorms will increase Tuesday as the next Pacific upper trough nears the WA coast, with southwest flow aloft drawing moisture northward from Nevada, especially on the Idaho side. Clouds and showers will inhibit further warming Tuesday. Showers and chance of thunderstorms will continue Tuesday night, again mainly on the Idaho side.

LONG TERM
Wednesday through Sunday
Upper level trough will remain the dominant feature over the Great Basin and Pacific Northwest through the period. This will keep subtropical moisture streaming across the Great Basin, bringing a threat of showers and thunderstorms each afternoon and evening. Locally heavy rain will fall in stronger showers and thunderstorms, along with gusty winds and small hail. After a shortwave passage on Friday, there will be a brief break in the as a ridge tries to build in from the south. However, the next low pressure will reach the Pacific Northwest Coast on Saturday and once again allow moisture from the Rocky Mountains to stream back into the area. PW increasing back into the 80th to 90th percentiles would suggest potential for heavy rainfall next weekend. Ensemble members are in good agreement with the pattern next weekend.

BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.

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