Marine Weather Net

Point St. George to Cape Mendocino CA from 10 to 60 NM Marine Forecast


TODAY

W
WINDS
10 - 15
KNOTS

TONIGHT

N
WINDS
5 - 10
KNOTS

THU

N
WINDS
10 - 15
KNOTS

THU NIGHT

N
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
PZZ470 Forecast Issued: 602 AM PST Wed Feb 19 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT
Today...W Wind 10 To 15 Kt. Seas 11 Ft. Wave Detail: S 9 Ft At 7 Seconds And W 5 Ft At 11 Seconds. Rain.
Tonight...N Wind 5 To 10 Kt. Seas 10 Ft. Wave Detail: Sw 3 Ft At 6 Seconds And W 10 Ft At 15 Seconds.
Thu...N Wind 10 To 15 Kt. Seas 9 Ft. Wave Detail: Nw 2 Ft At 5 Seconds And W 8 Ft At 15 Seconds.
Thu Night...N Wind 10 To 15 Kt. Seas 9 Ft. Wave Detail: N 3 Ft At 5 Seconds And W 7 Ft At 14 Seconds.
Fri...W Wind 5 To 10 Kt. Seas 9 Ft. Wave Detail: N 5 Ft At 8 Seconds And W 9 Ft At 15 Seconds.
Fri Night...S Wind 10 To 15 Kt. Seas 10 Ft. Wave Detail: W 10 Ft At 15 Seconds.
Sat...S Wind 15 To 20 Kt. Seas 10 Ft. Wave Detail: Sw 5 Ft At 6 Seconds And W 10 Ft At 14 Seconds. Rain.
Sat Night...S Wind 20 To 25 Kt. Seas 10 Ft. Wave Detail: Sw 7 Ft At 7 Seconds And W 8 Ft At 13 Seconds. Rain Likely.
Sun...S Wind 20 Kt. Seas 11 Ft. Wave Detail: S 7 Ft At 7 Seconds And W 8 Ft At 12 Seconds. A Chance Of Rain.
Sun Night...S Wind 15 To 20 Kt. Seas 11 Ft. Wave Detail: S 7 Ft At 7 Seconds And W 9 Ft At 13 Seconds. A Chance Of Rain.
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Area Forecast Discussion
National Weather Service Eureka CA
453am PST Wednesday Feb 19 2025

Synopsis
A quick hitting rain system will continue to impact the area through this afternoon. The strongest rain will be focused along the Humboldt and Del Norte coast. Conditions will quickly calm and begin to dry by tonight.

A frontal system moving onshore overnight, and will continue to push eastward across the forecast area this morning. Strong southerly winds have developed along the North Coast overnight. These winds are expected to peak briefly early this morning, with gusts from 40 to 50 mph over the coast headlands and exposed ridges in Del Norte and Humboldt counties...locally higher over the more prominent ridges. As of 3am PST, radar reflectivity a band of light to moderate rainfall along the coast. Isolated to numerous showers are expected in the wake of the front after sunrise. Shallow instability will allow convective showers capable of produce heavy rain rates up to 0.40 in/hr this morning. Rain will be strongly focused along the Northern half of the area, with 0.6 to 1.5 inches most likely across Del Norte County and 0.2 to 0.6 inches in Humboldt. Locations further inland and south will most likely see less than 0.25 inches. The heaviest precipitations is expected to occur in a 6 hour period right after 5am this morning. Snow levels remained over 5000 feet this morning. Scott Mountain Pass on Highway 3 will see some snow, up to 2 inches. The fast moving shortwave trough is expected to exit eastward late this afternoon, with lingering light showers through this evening, mainly across the northern forecast area.

High pressure is expected to builds in downstream of the upper level trough tonight through Thursday. This will promote clearing skies and dry conditions across the area, with surface offshore flow developing. Cold air advection will allow cold temperatures tonight into Thursday. Low temperatures are forecast to be generally in the mid 30's for the coastal and interior valleys, while mid to upper 20's for the valleys in Trinity County. Although, for areas where skies clear out quickly, areas of valley fog are expected to develop tonight into Thursday. /ZVS

.EXTENDEDRidging late the the week will generally bring warmer and drier conditions with possibly even a ragged and shallow marine layer along the coast. A shortwave in the ridge will most likely generate some moderate rain this weekend, but timing is uncertain with rain possible anywhere from Saturday through next Monday. Rain would most likely be shallow and focused only along the coast. /JHW


Marine
A system is moving across the area this morning, bringing near-Gale to Gale Force southerly gusts north of Cape Mendocino. This is a quick moving system, and winds will sharply decline and turn west-northwesterly after the frontal passage. The associated steep wind waves will quickly decay today, but seas will remain elevated as a large mid-period westerly swell of 10-12 ft fills in. Northerly winds increase tonight into Thursday, particularly south of Cape Mendocino. 20-30 kt gusts are possible Thursday afternoon south of the Cape, with the strongest winds in the lee of the Cape. North of the Cape, winds will be slightly weaker (15-20kts), with seas characterized mostly by decaying westerly swells. Winds ease Friday, but another long-period westerly swell of 10-12 ft is forecast to fill in, elevating seas once again. Another system is expected this weekend, bringing gusty southerly winds and steep seas. JB

.BEACH HAZARDS...A westerly swell of around 8-10 ft at 16 seconds is forecast to build into the waters Friday. With light winds and mild weather expected Friday, beachgoers should be cautious as this swell presents a moderate sneaker wave threat. Be cautious visiting steep beaches and jetties and remember to never turn your back on the ocean. JB.


.EKA WATCHES/WARNINGS/ADVISORIES... CA... Wind Advisory until 9am PST this morning for CAZ101-102- 104>106.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 3am PST Thursday for PZZ450-455.

Gale Warning until 6am PST early this morning for PZZ470.

Small Craft Advisory until 3am PST Friday for PZZ475.



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