textproduct: Boise

LONG TERM...Sunday through Thursday

Warm, southwesterly flow will develop aloft on Sunday ahead of a weak shortwave trough arriving Sunday night into Monday. Southwest to southeast surface winds will increase Sunday afternoon, mainly for southern areas. The trough has continued to weaken in the models, with only a 10-20% chance of precipitation forecast across the NE Oregon and W-central Idaho mountains through Monday morning. Snow levels will briefly lower to approximately 4500-5500 ft MSL, but any snow accumulations will be light. The accompanying cold front will support west to northwest winds and slightly cooler temperatures Monday, with temperatures remaining above normal. Strong high pressure will then return and dominate Tuesday through the rest of the week and re- introduce dry conditions with temperature inversions area-wide. Valley fog and stratus, as well as stagnant conditions, are likely to develop under the persistent ridge.

AVIATION

Areas of MVFR, and local IFR/LIFR, in valley freezing fog/stratus this morning. Local IFR in light snow developing after 29/12Z in mtns of E Oregon north of KBNO-KONO, and across the w-central ID mtns after 29/14Z. Mountains will remain obscured through the day. Surface winds: variable up to 10 kt. Winds aloft at 10kft MSL: W-NW 15-25 kt.

KBOI...VFR-MVFR visibility in mist through 29/16Z, then improving. Ceilings lowering to 5k-8k feet AGL late morning and afternoon. Surface winds: light, diurnal winds.

Weekend Outlook...Patchy freezing fog/low stratus in valleys Fri-Sun mornings. A 15% chance of light mountain snow in w-central Idaho Friday AM. Otherwise, VFR. Surface winds through Sunday: Variable up to 10 kt, except E-SE 5-15 kt with occasional 20-25 kt gusts from KBOI to KJER/KTWF.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None. OR...None.