textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- High pressure will bring above normal temperatures and dry conditions into early next week.

- Slightly cooler temperatures and chances for precipitation return for the middle to end of next week.

SHORT TERM /Through Tuesday Night/

Issued 340 AM MDT SUN APR 5 2026 High pressure will keep conditions dry with above normal temperatures through Tuesday. The upper level ridge axis will move overhead today, allowing high temperatures to increase 4-8 degrees from Saturday. Lower valleys will reach the lower 70s this afternoon. Otherwise, light easterly winds will develop this afternoon with high clouds moving overhead. Temperatures will warm a few more degrees on Monday as the ridge remains in place. A slight chance of showers will develop late Monday across eastern Oregon and the west-central Idaho mountains as a weak system approaches the area. On Tuesday, an upper level trough will move into the Pacific Northwest from the north. This system will bring breezy to gusty winds in the afternoon, especially across higher elevations where gusts will reach 25-40 mph. A cold front will move through late in the day, cooling high temperatures by around 5-10 degrees across the north, but arriving too late for cooling across southern areas.

LONG TERM /Wednesday through Sunday/

Issued 340 AM MDT SUN APR 5 2026 Slightly cooler and more unsettled conditions return in the extended period. The trough to our north will exit to the east on Wednesday, with continued breezy conditions and 5-10 degrees of cooling from Tuesday. Moisture ahead of a closed low near the California coast will bring a 20-40% chance of showers to southern areas on Wednesday. This low will slowly move onshore to our south through the end of the week. This will bring a 10-40% chance of showers Thursday and Friday, highest along the Nevada border and in the central Idaho mountains. Mild southerly flow ahead of the low will bring another warming trend, with lower valley high temperatures forecast to approach 70 degrees by Friday and Saturday. Precipitation chances increase to 30-50% across the area Saturday and Sunday as the low moves inland. Ensembles favor a reinforcing trough moving into the Pacific Northwest on Sunday with unsettled conditions likely to continue. Precipitation will primarily fall as rain through the period with snow levels above 6-8kft MSL.

AVIATION /12Z Sunday through Monday/

Issued 538 AM MDT SUN APR 5 2026

VFR with high clouds, except patchy fog this morning in w-central ID mtn valleys. Surface winds: NE-SE 5-15 kt. Winds aloft at 10kft MSL: S 5-10 kt.

KBOI...VFR with high clouds. Surface winds: SE 5-12 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.