textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Breezy afternoon wind gusts near the Western Magic Valley today (20-35 mph) and Tuesday (20-30 mph)

- Strong warming today through Wednesday, with widespread record high temperatures and dry conditions continuing through Saturday, then cooling.

SHORT TERM /Through Wednesday Night/

Issued 232 PM MDT MON MAR 16 2026 Currently, it is mostly cloudy across the area, with afternoon rain/snow showers ongoing across the northern part of our CWA. Accumulations expected to remain under 0.10 inches, with snow levels hovering from 7000-8000 feet MSL. An anomalously strong upper-level ridge will begin to build over the Desert Southwest and Great Basin, causing temperatures to steadily climb into record-breaking territory. Temperatures will rise from slightly above normal this afternoon, to 10-20 degrees above normal Tuesday, and 15-25 degrees above normal Wednesday. High temperatures on Tuesday will already be close to record- breaking, with confidence of breaking records increasing Wednesday onward. Apart from the temperatures, of note are the breezy to gusty afternoon winds (20-35 mph) in the Snake Basin east of Boise today and Tuesday. There is also a 5-10% chance of rain showers again across our northern zones Tuesday morning and afternoon. Minimal accumulations are expected with these showers.

LONG TERM /Thursday through Monday/

Issued 232 PM MDT MON MAR 16 2026 An anomalous high amplitude upper level anticyclone will dominate the western United States and will bring record high temperatures to southwestern Idaho and southeastern Oregon on Thursday and Friday. Dry weather, mostly sunny skies and light winds will be associated with this unusually warm weather pattern. Recent operational model runs of the GFS and ECMWF show that the upper level pattern will begin to flatten by Saturday as the upper level flow transitions to a more zonal west to east flow on Sunday bringing more clouds and cooler temperatures. There is still some uncertainty on when the cooling trend will begin, but larger model ensemble means show that temperatures will be cooler on Saturday by about 5 degrees, then drop another 5 degrees or so on Sunday, and still cooler on Monday.

AVIATION /00Z Tuesday through Wednesday/

Issued 613 PM MDT MON MAR 16 2026 VFR conditions will prevail in most areas of SW Idaho and SE Oregon with cloud coverage decreasing tonight. Light rain-snow showers over W-Central ID mountains near KMYL Tuesday morning through afternoon. Surface winds will be light and variable at less than 10 kts this evening, except SW 5-15 kt in Magic Valley. Winds aloft at 10,000 feet MSL will be northwesterly at 20 to 30 kts.

KBOI...VFR with northwesterly winds less than 7 kts this evening, becoming light and variable overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.