textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Strongest storms this afternoon and evening, bringing gusty winds, hail, and heavy rain. - Intermittent showers and thunderstorms through Sunday.

- Dry and mild Tuesday.

- Cooler temperatures with periods of precipitation through Wednesday through Friday.

SHORT TERM /Through Sunday Night/

Issued 255 PM MDT FRI APR 10 2026 A storm system remains off the CA coast today. Showers continue over eastern OR near Burns OR and Baker City OR this afternoon, which have kept temperatures cooler than forecast in those areas. This has caused a temperature gradient to form across the Snake Basin toward Mountain Home, with breezy northwest winds coming down the Treasure Valley. Strong storms are forming in central NV and will lift northward later this afternoon and evening where we expect scattered showers and thunderstorms. The main threats with the storms will be wind gusts up to 55 mph, heavy rain, and hail up to 1 inch. The best chances of strong storms will generally be over extreme SE OR and southwest ID south of the Snake Basin this evening. These storms will continue into the night with the best dynamics moving slowly east. The main wind threat will be from 3pm to 11pm MDT this evening. Scattered showers and isolated thunderstorms continue into Saturday and Sunday but thunderstorms will not be as strong as today. Temperatures cool around 10 degrees by Sunday as the low pressure system moves overhead.

LONG TERM /Monday through Friday/

Issued 255 PM MDT FRI APR 10 2026 The upper-level low creating the active weather pattern will continue to move through the Great Basin/Intermountain West region on Monday. Monday carries widespread high precipitation chances (50- 90%) across the region, however thunderstorm chances will be isolated due to the cooler surface temperatures during peak heating and less instability aloft. Snow levels look to drop to 4000-5000 on Monday night, with snow accumulations largely limited to higher peaks. The low will exit the Great Basin/Intermountain West by early Tuesday, bringing a brief return to mostly dry conditions from a short-lived upper-level ridge. Winds will remain breezy on Monday and Tuesday as this trough exits the Rockies. Shower chances quickly return Wednesday as another trough deepens into the region from British Columbia. This will bring much colder air and precipitation late Wednesday into Thursday. How far south the low tracks will heavily influence temperatures and snow levels for this event. Precipitation will taper off Thursday and even more Friday behind the trough and associated cold front. Persistent northwest flow aloft and multiple cold fronts will keep temperatures below normal throughout the long-term period.

AVIATION /00Z Saturday through Sunday/

Issued 631 PM MDT FRI APR 10 2026

Generally VFR. Scattered/numerous showers and thunderstorms moving S to N. Threats include erratic outflow winds 25-45 kt, hail, and brief MVFR-IFR in heavy rain, this evening into Saturday. Mountains obscured in low clouds and precip. Snow levels lowering to 6500-7500 ft MSL Saturday. Surface winds outside of storms: SW-NW 5-15 kt. Winds aloft at 10 kft MSL: S-SW 15-30 kt.

KBOI...Generally VFR. Showers and thunderstorms this evening, with best chance Sat/03Z-06Z. Then, periodic rain showers overnight. Potential thunderstorm threats: erratic outflows up to 40 kt, small hail, and brief MVFR-IFR in heavy rain. Surface winds outside of storms: NW-W 5-15 kt, then E-S up to 10 kt after Sat/08Z.

Weekend Outlook...Scattered showers/thunderstorms will continue Sat afternoon, then widespread precip Sat night. The afternoon thunderstorms may produce heavy rain, hail, and erratic outflow winds to 25-45 kt. Thunderstorm coverage will be more limited on Sunday, but numerous rain/mtn snow showers with gusty winds are expected. MVFR-IFR conditions in heavier precip. Mountain obscuration. Snow levels lowering to 5500-7000 ft MSL by Sun. Surface winds outside of storms: S-W 5-15 kt with PM gusts to 15-25 kt Sat/Sun.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.