Marine Weather and Tide Forecast for Harper, OR

AVIATION
Prevailing VFR conditions. Clear Skies with the exception of south-central Idaho, where mid/high clouds linger but clearing through tomorrow morning. Surface winds: NW to NE 5-15kt, becoming variable under 10 kt tonight. Winds aloft at 10kft: N-NE 5- 15 kt, becoming N-NW 10-20 kt overnight.

KBOI...VFR. W-NW surface winds less than 15 kt through the evening, becoming light out of the SE tonight, then shifting NW tomorrow afternoon.

Weekend Outlook. VFR with surface winds W-NW at 5-15kts. Strongest during the day becoming variable over nights. Periods of clouds Saturday and Sunday, with chances of precipitation Sunday afternoon mainly over West-Central ID Mountains and SW Highlands. Low chance (10-20%) of thunder Sunday afternoon, primarily for higher terrains above 5000 ft and the ID-NV border. Mountains obscured in precipitation. Snow levels 5.5-6.5 kft MSL.

PREV DISCUSSION
SHORT TERM
Tonight through Sunday night
Currently sitting underneath northerly flow aloft, bringing cooler than normal temps and some ongoing gusty winds. Mostly clear skies will stick around Friday until Saturday morning/midday when flow aloft gives way to a small shortwave trough. Cloudy skies will be present much of Saturday associated with this shortwave. Precipitation chances Saturday are small, limited to Northern Adams and Valley counties with PoPs anywhere from 15-30%. Snow levels will be around 5500-6000 feet. A long wave trough will impinge on the area Sunday. This upper- air disturbance will also have precipitation chances limited to Northern Adams and Valley counties, with PoPs ranging from 20-50%.
Thunderstorms are possible Sunday afternoon and evening in Northern Adams and Valley counties as well as near the ID/NV border in higher terrain. Thunderstorm chances along the ID/NV border range from 20- 50% as well. Afternoons during this period will have gusts up to 20 mph, with decreasing wind speeds into the overnight hours.
Temperatures are seasonable over this period.

LONG TERM
Monday through Friday
Broad troughing across the CONUS keeping the area under northwesterly flow aloft early next week. Monday will be the coolest day of the week with breezy NW winds, chances of seeing winds >20 MPH range from 40-65% as you follow the Snake Plain east from Mountain Home. Precipitation chances remain (20-40%) in the West-Central Mountains as the shortwave exits our area. Another weak wave will pass over the region Wednesday, but it looks to be too dry for precipitation barring a 10-20% chance in the higher elevations of the West- Central Mountains. Following that shortwave, model ensembles are indicating a short lived ridge building over the area Thursday ahead of the next system. Chances for precipitation increase Friday afternoon as an upper level trough begins to enter our area.
Temperatures trend up throughout the week, Leaning above normal.
Snow levels rising from 5-6kft MSL on Monday to 7-8kft by Friday.

BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.