textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Widespread subfreezing temperatures tonight. - Drier and warmer conditions Friday through Sunday. Sunday will be 5-10 degrees above normal.

- Next chance of precipitation late Tuesday through Thursday from incoming Pacific low.

SHORT TERM /Through Saturday Night/

Issued 225 PM MDT THU APR 16 2026 Weak, scattered snow/graupel showers will taper off by tonight. Snow levels will stay at valley floors tonight through Friday afternoon. Winds are expected to weaken tonight, except elevated gusts up to 30 mph will continue over Magic Valley through around midnight.

Temperatures will drop down into the mid to upper 20s late tonight through Friday morning. As such, a freeze warning is in place tonight through Friday morning. Patchy fog is possible in sheltered mountain valleys. Otherwise, Friday will see some breezy northwest winds and much drier conditions, as a Pacific high pressure starts building into the region. Friday night through Saturday morning could see temperatures at or below freezing. Saturday will see clearer and calmer conditions with a slight warming trend to normal temperatures. Some elevated wind gusts are expected over East-Central OR and Upper Treasure Valley ID on Saturday.

LONG TERM /Sunday through Thursday/

Issued 225 PM MDT THU APR 16 2026 Mild and dry conditions will carry into early next week as a closed low digs off the West coast. Southerly flow will push temperatures to 10-15 degrees above normal for Sun-Tue, placing lower elevations in the mid-upper 70s and mtn valleys into the mid 60s. The forecast for Tuesday has trended drier and warmer due to slower progression of the Pacific closed low. Given recent model trends would expect forecast for Tuesday to continue leaning drier especially across SW Idaho zones. Model consensus is for the upper low to eject inland on Wednesday, bringing a 40-50% chance of showers in the valleys and 60- 80% chance in the mountains. Snow levels on Wednesday will range between 6-8kft MSL. A 20-40% chance of showers lingers on Thursday as models show the low kicking eastward. Temperatures will cool down to near normal for Wed/Thur.

AVIATION /00Z Friday through Saturday/

Issued 549 PM MDT THU APR 16 2026

Scattered snow showers producing brief MVFR/IFR conditions and obscuring mountains will decrease through sunset. Local mtn valley fog overnight. VFR on Friday, with scattered cumulus over mtns. Surface winds: W-NW 10-20 kt with gusts to 20-30 kt through sunset. Winds becoming variable less than 10 kt overnight and Friday, except SW-NW 10-20 kt in the Magic Valley. Winds aloft at 10kft MSL: NW 15-25 kt.

KBOI...VFR with scattered to broken cumulus through sunset. Isolated snow showers through early evening with a 10% chance to impact the terminal. Gusty northwest surface winds will weaken by 02Z, becoming light and variable overnight.

Weekend Outlook...VFR. It will be dry with periods of mid-high cloud cover. Local mtn valley fog Saturday morning. Surface winds S-SE 5-15 kt Saturday increasing to 10-20 kt with gusts 20-30 kt on Sunday. Strongest winds on Sunday in the Snake Plain east of KBOI. Variable up to 15 kt overnight Sat/Sun night.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Freeze Warning from midnight tonight to 10 AM MDT Friday for IDZ012-014-016. OR...Freeze Warning from midnight MDT /11 PM PDT/ tonight to 10 AM MDT /9 AM PDT/ Friday for ORZ064.