Point St. George to Point Arena between 150 and 250 NM Offshore Forecast
|Tonight...Nw Winds 20 To 30 Kt, Becoming N To Nw 25 To 35 Kt. Seas 11 To 18 Ft.|
|Fri...N Winds 25 To 30 Kt. Seas 14 To 18 Ft. Chance Of Rain.|
|Fri Night...N Winds 25 To 30 Kt. Seas 12 To 16 Ft. Chance Of Rain.|
|Sat...N Winds 20 To 30 Kt. Seas 10 To 15 Ft.|
|Sat Night...N Winds 15 To 25 Kt, Becoming Nw 20 To 30 Kt. Seas 9 To 13 Ft.|
|Sun...N To Nw Winds 30 To 40 Kt. Seas 12 To 20 Ft.|
|Sun Night...Nw Winds 30 To 35 Kt, Diminishing To 25 To 30 Kt. Seas 18 To 22 Ft.|
|Mon...Nw Winds 25 To 35 Kt, Becoming 25 To 30 Kt. Seas 18 To 22 Ft.|
|Mon Night...Nw Winds 20 To 30 Kt. Seas 15 To 20 Ft.|
|Tue...W To Nw Winds 15 To 25 Kt. Seas 13 To 18 Ft.|
|Tue Night...W To Nw Winds 20 To 30 Kt. Seas 13 To 17 Ft.|
| Area Forecast Discussion|
National Weather Service Eureka CA
357am PST Thu Jan 21 2021
An initially dry airmass will moisten today as a weak front approaches from the northwest. Light shower activity will subsequently spread across northwest California this evening into Friday. Thereafter, a day of dry weather appears likely Saturday, followed by widespread moderate precipitation Sunday and Monday. Additional precipitation will be possible through the middle of next week.
An upper-level shortwave trough currently located offshore from Vancouver Island, BC is forecast to dig southward today...eventually moving across NWRN CA late tonight. As that occurs, light shower activity is forecast to spread across the EKA CWA this evening and then linger through part of Friday. Large- scale subsidence is then forecast to develop across the area on Saturday, which will be accompanied by clearing skies, chilly morning temperatures, valley fog and frost, and cool afternoon highs. Model guidance shows another upper wave amplifying across the west coast on Sunday. Widespread moderate precipitation appears probable with that feature. In addition, freezing levels will reside near 2000 feet during much of Sunday morning through the evening. Thus, accumulating snowfall will be possible at highway pass levels in Trinity County.
Upper troughing is forecast to persist across the western United States during Monday, though the shortwave details are uncertain at this time. In general, showery weather appears likely during early portions of next week. Additional precipitation will be possible during the middle of next week as well, and cold midlevel temperatures will support potentially impactful snowfall as far west as Berry Summit on Highway 299 in Humboldt County.
Winds are expected to remain light near the coast through about midday today. Winds then shift to the southwest ahead of an approaching low this afternoon and evening, then quickly turn northerly on Friday after it passes overhead. Advisory-level northerlies then persist in its wake through at least the first half of this weekend, where a few gale force gusts may be possible in the southern outers on Saturday. Nearshore winds may briefly weaken late Saturday, however widespread northerlies should return Sunday through early next week.
Besides a mystery pulse of mid-period NW energy early this morning, a smaller WNW swell is expected to decay through the day today. Another northwest swell is expected to fill in tomorrow, with current guidance bringing it in just as local northerlies winds and seas pick up heading into the weekend. Seas are expected to remain elevated through the weekend into early next week, with combined seas nearing 18 ft as a solid burst of NW energy enters the waters behind a weak front on Sunday. /TDJ
.EKA WATCHES/WARNINGS/ADVISORIES... CA...None. NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory from 1 pm Friday to 3am PST Saturday for PZZ450.
Small Craft Advisory from 10pm this evening to 3am PST Sunday for PZZ470.
Small Craft Advisory from 7am Friday to 3am PST Saturday for PZZ455.
Small Craft Advisory from 1am Friday to 3am PST Sunday for PZZ475.