textproduct: Boise
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
UPDATE
Updated aviation discussion.
KEY MESSAGES
- Frost Advisory for the western Magic Valley until 8 AM MDT this morning.
- Warming trend and continued generally dry the rest of the week. Monday should be the warmest day.
- Cold front early Tuesday, then windy and turning cooler with a chance of showers and thunderstorms.
SHORT TERM /Through Thursday Night/
Issued 248 AM MDT TUE MAY 19 2026 Patchy frost this morning in the western Magic Valley but Wednesday morning will be milder with no frost. Gradual warming trend today through Thursday as the main upper trough shifts east of the Continental Divide. However, another weaker upper trough, in BC early this morning, will dig southward into eastern ID Wednesday and limit the warming in our area. This second trough will be close enough to our CWA for a slight chance of showers in eastern Valley County Wednesday evening, and also slightly stronger wind in the Magic Valley Wednesday afternoon. Otherwise, no eventful weather through Thursday night.
LONG TERM /Friday through Tuesday/
Issued 248 AM MDT TUE MAY 19 2026 A ridge of high pressure will build over the Western US by the end of this week, bringing generally warm and dry conditions to the region through Monday. Temperatures will be about 10-15 degrees above normal. On Saturday, a quick moving shortwave trough will move through the region bringing low chances of showers and thunderstorms (<10% chance) over high terrain in southwest Idaho and the OR-NV border. The ridge will reach peak strength on Sunday, with high temperatures near 90F in the Treasure Valley. By Monday, there is widespread model agreement in a deep upper level low moving into the Pacific Northwest. The low will then move into the region on Tuesday, cooling temperatures off by 10-20 degrees and bringing breezy winds with a chance of showers and thunderstorms (20-30% chance).
AVIATION /12Z Tuesday through Wednesday/
Issued 537 AM MDT TUE MAY 19 2026
VFR. Virga/isolated showers re-developing Tuesday afternoon over high terrain, mainly the northeast OR/central ID mtns. Surface winds: SW-NW 5-15 kt becoming variable less than 10 kt after Wed/06Z. Winds aloft at 10kft MSL: transitioning from NW to W, 5-15 kt.
KBOI...VFR. Surface winds: light and variable through the morning. Then, NW 5-10 kt Tue afternoon with occasional gusts around 15 kt.
BOI WATCHES/WARNINGS/ADVISORIES
ID...Frost Advisory until 8 AM MDT this morning for IDZ016. OR...None.
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