textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Dry and gradually warming through Memorial Day.

- Much cooler with gusty winds and a chance of showers Tuesday and Wednesday, warming Thursday.

SHORT TERM /Through Saturday Night/

Issued 310 AM MDT THU MAY 21 2026 No significant changes to previous forecast in the short term, i.e., continued day-to-day warming through Monday (Memorial Day) when southwesterly flow aloft fully replaces the current cool northwesterly flow aloft. This afternoon also looks windier than yesterday in the Snake Basin with gusts up to 35 mph. Skies will be mostly clear, with only scattered high clouds.

LONG TERM /Sunday through Thursday/

Issued 310 AM MDT THU MAY 21 2026 A strong Pacific cold front will pass through our CWA Tuesday bringing gusty winds, rapid cooling, and a chance of showers but only light amounts of rain, generally .10 inch or less. The cold front looks slightly weaker than it did yesterday, with the supporting upper low still passing right over our CWA but not as deep as before. Models agreement has also decreased slightly and may partially account for the slight average weakening. In any case, Tuesday and Wednesday should be a full 20 degrees cooler than Monday, with a warming trend starting again Thursday.

AVIATION /12Z Thursday through Friday/

Issued 547 AM MDT THU MAY 21 2026 VFR, with SCT-BKN high clouds after 20Z. Surface winds: NW 5-10 kt overnight through morning. Weak, dry cold front this afternoon with NW wind 10-15 kt, gusts to 25 kt. Winds aloft at 10kft: N around 15 kt.

KBOI...VFR with mostly clear skies. Surface winds: light/variable through 16Z then NW 10-15 kt with gusts 20-25 kt from 18Z to 22/02Z.

Weekend Outlook...VFR. Mostly clear. Increasing west wind Sunday afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.