textproduct: Boise

KEY MESSAGES

- Hot afternoon expected temperatures on Thursday with temps 10 to 15 degrees above normal.

- Winds increasing across southern Oregon and Idaho on Thursday afternoon ahead of cold front. - Cold front passage Friday with cooler temperatures heading into this weekend and a 20 percent chance of precipitation across northern portions of the forecast area Friday.

- Cooler conditions continue beginning on Saturday and continuing through early next week.

SHORT TERM /Through Friday Night/

Mostly clear skies and light winds are expected tonight across southwestern Idaho and southeastern Oregon. Tomorrow will be mostly sunny with hot afternoon temperatures in valley locations and warm and dry conditions in the mountains. Afternoon Temperatures will reach the low 90s in valley locations. Winds will become breezy tomorrow afternoon from a southwesterly direction in southern Oregon and from a southeasterly direction through Snake River Plain of southern Idaho. A mostly dry cold front will move through the area on Friday afternoon bringing gusty northwest winds and only a slight (20 percent) chance of precipitation in the mountains north of Baker City and McCall. Cooler air behind the front will move into the area on Friday night.

LONG TERM /Saturday through Wednesday/

Temperatures of near to around 5 degrees below normal will persist through the long-term period. Sunday will warm a few degrees compared to Saturday, as our area gets a brief period of southwesterly return flow ahead of the next system. Consensus is still good on another cold front, weaker than that of Friday, crossing over our area come late Sunday. This front will help keep breezy west/northwest winds and the cool conditions in place. This trough should keep the tropical moisture from activity in the eastern Pacific south and east of our area. However, guidance has trended a little wetter with this front, supporting a 15-30% chance of showers primarily across higher terrain of southwest Idaho. Although uncertainty is still on the higher side in regard to moisture availability. Shortwave ridging behind this trough will for dry conditions and a warming trend into mid-week next week.

AVIATION /18Z Wednesday through Thursday/

Issued 1159 AM MDT WED SEP 23 2026

VFR. Surface winds: Generally variable or SW-SE 5-10 kt this afternoon. Increasing overnight in SW-Idaho to S-SE 5-15 kt with gusts to around 22 kt by late Thu/AM. Winds aloft at 10kft MSL: SW-NW 5-20 kt.

KBOI...VFR. Surface winds: S-SE 5-15 kt throughout the period, with gusts up to 22 kt late Thu/AM.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.