textproduct: Boise

KEY MESSAGES

- Showers and thunderstorms increase area-wide tonight and Tuesday, then chances remaining over higher terrain Wednesday through next weekend.

- Locally heavy rainfall could affect burn scars across southeast Oregon.

- Hot temperatures continue this week and coming weekend.

SHORT TERM /Through Wednesday Night/

The large scale pattern remains locked in place with a broad high over the interior West and upper trough off the Pac NW coast. Southerly flow aloft, continue to transport deep monsoon moisture into the region. Cloud cover is limiting heating this afternoon, which will limit thunderstorm development. Showers and storms that develop could bring outflow gusts to 40 mph. A weak upper disturbance will bring another chance of showers and possible thunderstorms starting Tuesday morning, with instability caring the threat into the evening. As precipitable water values climb well over an inch, heavy rain will be possible from storms that develop. Expect this threat to be focused across SE Oregon and along the ID/NV border where the best heating and instability sets up. Gusty outflow winds to 40 mph will also be in play. Otherwise the cloud cover will again keep temperatures in check. Wednesday clearing skies and hotter conditions as drier air moves in aloft. A minimal shower/storm threat will reside over the mtns of Baker County and west- central Idaho. High temperatures will warm back above normal, reaching the mid-upper 90s at lower elevations.

AVIATION /18Z Monday through Tuesday/

Issued 1141 AM MDT MON JUL 13 2026 VFR with an overcast band of clouds and virga over W ID and SE OR. Density altitude is high due to heat. Chance of rain is low this morning, but late in the afternoon and evening isolated showers and storms are possible in OR. Isolated showers continue overnight, but increase in coverage tomorrow. Surface winds: SW to NW 5-15 kt this afternoon, with localized gusts to 20-25 kt. Winds aloft at 10kft MSL: SW 10-25 kt.

KBOI...VFR with clouds to the west. Rain is unlikely today, but a 15% chance of showers begins early Tuesday. Surface winds: NW 5-12 kt. Afternoon gusts around 20 kt. High density altitude due to heat.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Heat Advisory until 9 PM MDT this evening for IDZ012-014. Heat Advisory until 9 PM MDT this evening for IDZ016-030. OR...Heat Advisory until 9 PM MDT /8 PM PDT/ this evening for ORZ064.