textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Temperatures warming to near normal Monday. - Widespread showers late Monday night through Tuesday morning, a slight chance of thunderstorms Tuesday. - Warming and drying Thursday through Saturday.

SHORT TERM /Through Tuesday Night/

Issued 231 PM MDT SUN JUN 7 2026 A cool upper level trough will continue to track across MT this evening and breezy northwest winds subside after sunset. After a lull tonight, the next system arrives Monday afternoon across eastern Oregon, with increasing clouds and showers developing in the afternoon. Showers will increase across the area on Monday night into Tuesday morning. A slight chance of thunderstorms on Tuesday as cool unstable air moves overhead. The bulk of the system will remain north of McCall to Baker City, so precipitation amounts continue to trend downward. Precipitation amounts will be 0.25 to 0.75 inch across the mountains with up to 0.25 inch in the valleys. Snow levels will be 7500-8500 feet with this system. Temperatures warm to near normal on Monday and lower to below normal on Tuesday.

LONG TERM /Wednesday through Sunday/

Issued 231 PM MDT SUN JUN 7 2026 There is strong agreement amongst both the deterministic and ensemble models in the extended forecast. Current projections are favoring a pattern with a broad ridge camping off-shore over the eastern Pacific and west to northwest flow in place over the northern Rockies. This pattern would allow for a slow warming and drying trend for eastern Oregon and southwest Idaho. The details are still be be seen, but there appears to be a lack of significant system or moisture to move through the flow into next weekend to deviate from this trend. Expect highs to climb to 3-5 degrees above normal. This pattern would favor afternoon breezy conditions in wind prone areas as well.

AVIATION /00Z Monday through Tuesday/

Issued 624 PM MDT SUN JUN 7 2026

VFR with increasing high clouds this evening and overnight. Chance of showers entering eastern Oregon by mid afternoon Monday. Surface winds: NW 10-20 kt, becoming variable under 10 kts overnight. Winds aloft at 10kft: W/SW 10-20 kt.

KBOI...VFR with increasing high clouds this evening and overnight. Surface winds: NW 7-12 kt, becoming SE under 10 kt after 04Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Red Flag warning until 9 PM MDT this evening for IDZ424-426.

OR...None.