Area Forecast Discussion

KEY MESSAGES

- Frost possible across portions of Snake Plain this morning, mainly outside the interstate corridor.

- Next chance of rain late week.

DISCUSSION

Issued at 103 AM MDT Tue Sep 15 2026

Chilly start to the morning with many areas falling into the 30s. The frost advisory remains in effect until 9am. Temps should quickly rebound with most locations seeing highs in the 70s today. Overnight lows look like they'll stay warm enough in most locations for Wednesday morning. Although there could be a few spots across the upper Snake Plain that could see some patchy frost. Temps rise to near 80 in across most of the Snake Plain and eastern Magic Valley on Wednesday. Meanwhile, a low pressure system will work into the Pacific Northwest. This system will lift monsoonal moisture into our region for Wednesday through Friday resulting in showers and storms. The low will pass through over the weekend and potentially we could see another round of frost advisories for Saturday and Sunday mornings.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 103 AM MDT Tue Sep 15 2026

A few high clouds may drift through today. Otherwise, VFR conditions likely today with light winds at all TAF sites.

FIRE WEATHER

Issued at 103 AM MDT Tue Sep 15 2026

Dry weather is likely today with humidities falling into the teens this afternoon. However, winds should be much lighter today and Wednesday. Monsoon moisture will return for Wednesday through Friday resulting in showers and storms across the region.

PIH WATCHES / WARNINGS / ADVISORIES

Frost Advisory until 9 AM MDT this morning for IDZ051>054.