Marine Weather and Tide Forecast for Boardman, OR

DISCUSSION
Satellite imagery tonight shows an upper level low swinging into ID, with clear skies developing across the western third of the forecast area. Meanwhile, regional radar shows a line of isolated showers from La Grande due north into the WA Columbia Basin and lighter showers over Wallowa county.

Today, the upper low will continue to swing east into the northern Rockies, with showers and cloud cover continuing to diminish west to east across the forecast area. Shower activity will mainly be focused across Wallowa County through this afternoon with a brief renewal in shower development tonight as a secondary low quickly swings across the area.

Tuesday into Wednesday, the forecast area will mostly be under a split flow aloft that'll become zonal ahead of an approaching trough. A drying and warming trend will develop, with afternoon temperatures warming back into the 80s by Wednesday (confidence 65-80%). Thursday, breezy winds will return to the forecast area as an upper trough approaches the region from the north. Winds will generally be 15-25mph with strongest gusts up to 40 mph.
Relative humidities will also be low but above critical thresholds across the Columbia Basin and Cascade Gaps during this time, leading to elevated fire weather concerns for Thursday (confidence 55-75%).

Friday into the weekend, ensemble guidance is in good agreement of the upper trough slowly passing over the PacNW, with over 80% of ensemble members (from ECMWF, GFS, Canadian) favoring Saturday for light rain in the lower elevations and light to moderate precipitation in the mountains. That said, disagreement in timing of the trough exit is growing, with 22% of members favoring dry conditions returning by Saturday night, whereas 66% of members favor mountain showers continuing into Sunday. While confidence is moderate (40-55%) in shower activity over the weekend, confidence is low (20-25%) in timing and extent. Otherwise, there is moderate confidence (50-60%) that the upper trough passage will bring cooler conditions to the forecast area. Lawhorn/82

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/
VFR conditions to prevail through the period. Confidence is low (25%) in MVFR/vsby CIG developing at sites. Winds will increase to 12-17kts with gusts up to 25kts at sites DLS/PDT after 17Z< then becoming light in the evening. Winds will otherwise be light through the period. Lawhorn/82



Preliminary Point Temps/PoPs
PDT 71 42 75 47 / 10 0 0 0 ALW 73 49 77 52 / 20 0 0 0 PSC 76 46 79 48 / 0 0 0 0 YKM 76 48 78 50 / 0 0 0 0 HRI 74 45 78 47 / 0 0 0 0 ELN 71 45 77 47 / 0 0 0 0 RDM 68 38 75 40 / 0 0 0 0 LGD 68 42 74 45 / 20 10 0 0 GCD 67 41 76 46 / 10 0 0 0 DLS 74 51 80 55 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES
WA...None.
OR...None.