Marine Weather and Tide Forecast for Lake Ketchum, WA

SHORT TERM /TONIGHT THROUGH THURSDAY/
Dry and mostly sunny conditions dominate across western WA this afternoon as a ridge of high pressure noses into the region. Another cool night is expected overnight with areas of isolated fog and frost possible again. That said, temperatures are expected to be slightly higher, limiting the frost extent even more than this morning.

The ridge will shift east across the region Wednesday and Thursday allowing for a significant warm up. By Thursday, afternoon highs will reach into the low to mid 70s across the region.

LONG TERM /FRIDAY THROUGH TUESDAY/
By Friday, a trough off the coast will elongate and cluster analysis now slightly favors a cutoff low bringing the bulk of the energy south of the region Friday through Sunday and leaving western WA warmer and somewhat drier. Still there is a ~40% chance that the trough holds together and brings more of the energy our way leading to a wetter and cooler solution.

There remains a signal in ensemble guidance for weak and potentially transient ridging in the Monday/Tuesday timeframe next week. All in all, little impact is expected at this time.
-Wolcott-

AVIATION
Upper ridging centered offshore will continue to build into the region with north to northwest flow aloft. The low level flow is northerly. VFR conditions prevail. Patchy stratus on Wednesday morning will be restricted to outlying river valleys, the Chehalis Gap, and portions of the immediate coast.

KSEA...VFR. Surface winds northerly 8 to 11 knots midday then shifting light northeasterly tonight. 27

MARINE
A broad surface ridge centered offshore will gradually weaken into Thursday. A weak trough moving into the Oregon offshore waters late in the week will increase northwesterlies over the coastal waters, but will otherwise produce little impact across area waters. 27

HYDROLOGY
No river flooding is expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...None.