textproduct: Boise

KEY MESSAGES

- Freeze again this morning in the agricultural valleys. - Dry and warming through Monday.

- Showers and thunderstorms and turning cooler Tuesday as a Pacific cold front moves inland.

SHORT TERM /Through Monday Night/

Freeze warning in the agricultural areas of the Treasure and Magic Valleys will remain in effect until 10 AM MDT. Tonight's lows will be generally in the mid to upper 30s and no further freeze is expected.

High pressure aloft in the eastern Pacific will build inland today and Sunday and remain through Monday, bringing dry weather with a steady warming trend. High temps will warm around 10 degrees each day, while lows warm about 5 degrees per day. Surface winds will become south-southeast and gusty in the afternoons.

LONG TERM /Tuesday through Saturday/

Well-above normal temperatures and breezy southerly winds are anticipated Tuesday ahead of an approaching cold-core Pacific low. This low will bring showers and a slight chance of thunderstorms into E Oregon and SW Idaho Tuesday evening into Wed. Wednesday will become the wettest day, with the probability of precip climbing to 60-90% for the morning and afternoon. Snow levels will also lower to 5000-6500 ft MSL at that time as the low center moves overhead, allowing snow accumulation over the higher terrain. Surface winds will increase Wed afternoon as they shift to westerly, and max temperatures are forecast to drop as much as 20-25 degrees from Tuesday to Wednesday. Showers and below normal temperatures will persist into Thursday as the upper low becomes ingested into the parent Canadian trough to the north. This will solidify cool and unsettled northerly flow across the N Rockies as the low progresses east, with lingering mountain showers expected into Fri. The 500mb pattern starts to become disorganized Friday and beyond as models struggle to depict the morphology of the trough, resulting in less forecast confidence in precip/temps for Friday into the weekend.

AVIATION /06Z Saturday through Sunday/

Issued 1117 PM MDT FRI APR 17 2026

VFR under high clouds. Surface winds: variable less than 10 kt, becoming S-SE 5-15 kt after Sat/16Z. Gusts to 20 kt in the lower Snake Plain into KBKE. Winds aloft at 10kft MSL: W-NW 5-15 kt, becoming SW after Sat/12Z.

KBOI...VFR. Surface winds: SE 7-14 kt. Gusts to 20 kt early in the afternoon.

Sunday Outlook...Continued dry with periods of high cloud cover. Surface winds S-SE 10-20 kt with gusts to 25 kt, strongest in Snake Plain east of KBOI.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Freeze Warning until 10 AM MDT this morning for IDZ012-014-016. OR...Freeze Warning until 10 AM MDT /9 AM PDT/ this morning for ORZ064.