textproduct: Boise

KEY MESSAGES

- Continued warm, dry days through Friday. Near record high temperatures.

- Valley rain and mountain snow along an eastward-moving cold front Friday night and Saturday morning. Additional rain and mountain snow, along with cooler temperatures, next week.

- Breezy south or southeast winds, strongest in Harney County Friday afternoon.

SHORT TERM /Through Friday Night/

A strong upper level ridge over the interior western US will build further as the axis shifts eastward to the Continental Divide by late Thursday. Meanwhile, a Pacific upper trough will deepen as it moves eastward across the north Pacific. The highly amplified ridge/trough pattern will maintain warm, dry, and breezy weather in our CWA through Friday. High temps will be near daily records Thursday and Friday. Breezy east-southeast winds will blow in the Snake Basin between Boise and Twin Falls the rest of today, but lighter winds are expected Thursday. On Friday south winds will increase significantly in Harney County, with gusts to 45 mph. Southeast winds will also increase in the Snake Basin Friday afternoon with gusts to 30 mph. The Pacific trough will come inland Friday night and bring several hours of valley rain and mountain snow along an eastward-moving cold front. Latest models move the front across eastern OR Friday evening and western ID between midnight and 6 AM Saturday. Heaviest precipitation will be in the Boise Mountains -- up to .35 inch --, with .10 to .25 inch in other mountains, and .05 to .15 inch in the valleys. The frontal passage will end the gusty south winds in Harney County.

LONG TERM /Saturday through Wednesday/

The upper-level trough will continue to move through the region and then east Saturday, with lingering precipitation ending gradually through the day behind the cold front. Winds will also remain breezy behind the front and gradually weaken in the evening. A brief upper-level ridge will make an appearance Sunday, creating dry and slightly warmer conditions from Saturday. The next system will be fast approaching late Sunday as a deep upper-level trough moves inland from the Gulf of Alaska. Winds will increase yet again late Sunday into early next week as this pattern moves in. This trough will also weaken as it moves over the area while still bringing a cold front and precipitation. While ensembles differ on the exact timing, it is expected to move through between Sunday night and early Tuesday, with Monday seeing the highest (50-80%) chances of precipitation. Light to locally moderate precipitation totals are expected. Snow levels will lower from around 6000 feet Sunday night to 4000-5500 feet by the time precipitation ends, allowing for additional mountain snowfall. Temperatures will trend lower with highs cooling to near normal by Tuesday. Winds will continue to weaken as the system progresses but remain locally breezy.

On Wednesday, another low from the Gulf of Alaska will approach the coast with precipitation chances increasing late in the day.

AVIATION /18Z Wednesday through Thursday/

Issued 1122 AM MST WED NOV 11 2026

Mainly VFR under passing high clouds. LLWS developing overnight from KMUO to KBKE. Surface winds: Generally E-SE 5-15 kt with gusts 15-25 kt this afternoon in portions of E-Oregon and the Snake Plain. Similar conditions expected Thursday. Winds aloft at 10kft MSL: S-SW 10-20 kt.

KBOI...VFR. LLWS developing overnight tonight, lasting into early tomorrow morning. Surface winds: light and variable becoming SE 6-12 kt. Gusts to around 20 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.