textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

DISCUSSION

A dry and cold air mass is locked in place, with many single digits and teens temperature readings this morning. Areas of low stratus have developed across the Upper Treasure and western Magic Valleys, but drier air advecting in from the northwest will erode the clouds through the early afternoon as winds increase to 10-15 mph. After a cold day today, a warming trend looks set to take place, along with weakening inversion and air stagnation conditions.

AVIATION

MVFR stratus in the valleys, generally below 5000 feet MSL near KBKE KTWF KJER KGNG, otherwise VFR. Clear skies to become widespread by afternoon. Surface winds: light and variable, becoming NW 5-10kt during the afternoon, except near KTWF and KJER with W-NW 9-14kt. Winds aloft at 10kft MSL: NW-NE 20-30kt.

KBOI...VFR. Light winds becoming NW 7-12kt during afternoon.

Sunday Outlook...VFR. Patchy fog in the mountain valleys Sunday morning. Light winds.

PREV DISCUSSION

SHORT TERM...Today through Monday night...A cold front has moved through the area and eroded the stratus in most places from Burns to Ontario to Boise, with lingering stratus over Baker County and upper Treasure Valley east of Boise to the Magic Valley. Low clouds and fog will linger over the Magic Valley today with a weak convergence zone keeping clouds over that part of the Snake Basin. Dry air will continue to move into the area and should erred most of the stratus by this afternoon mostly clear skies late. High clouds will stream into eastern OR on Sunday and Monday, but continued dry. A slight warming trend expected on Sunday and Monday but temperatures will be around 5 degrees below normal in the short term.

LONG TERM...Tuesday through Saturday...A ridge will build over the area on Tuesday and Wednesday with a temperature inversion strengthening. A couple of systems approach the Pacific NW but weaken as they move inland with high clouds expected. Shower chances remain at 10 percent or lower in the extended period. Temperatures will slowly warm to near normal in the valleys with above normal temperatures in the mountains.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Air Stagnation Advisory until noon MST today IDZ011>014-016-028-033. OR...Air Stagnation Advisory until noon MST /11 AM PST/ today ORZ061>064.

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