Marine Weather Net

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


5 - 15


5 - 15


5 - 10


25 - 35

The Marine Weather Forecast In Detail:
PZZ450 Forecast Issued: 247 AM PDT Sun Mar 26 2023

Today...N Winds 5 To 15 Kt. Waves Nw 8 Ft At 12 Seconds. Isolated Showers.
Tonight...Ne Winds 5 To 15 Kt. Waves Nw 7 Ft At 12 Seconds.
Mon...Se Winds 5 To 10 Kt...Becoming S 15 To 25 Kt With Gusts To Around 35 Kt. Waves Nw 6 Ft At 11 Seconds. Rain.
Mon Night...S Winds 25 To 35 Kt. Waves Sw 12 Ft At 10 Seconds...And Sw 3 Ft At 11 Seconds.
Tue...S Winds 20 To 30 Kt. Waves W 15 Ft At 12 Seconds.
Wed...N Winds 5 To 10 Kt. Waves W 6 Ft At 10 Seconds...And Nw 5 Ft At 12 Seconds.
Thu...Nw Winds 5 To 10 Kt. Waves Nw 5 Ft At 9 Seconds.
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Area Forecast Discussion
National Weather Service Eureka CA
250pm PDT Sat Mar 25 2023

Clearing skies late tonight will favor cold temperatures across much of Northwestern California during Sunday morning. Otherwise, dry weather on Sunday will be followed by a strong storm system entering the region early next week. Heavy mountain snow, gusty south winds, and low-elevation rainfall can be expected Monday through Wednesday, with additional periods of unsettled weather possible during the second half of the upcoming week.

Cold air aloft (near -30C at 500 mb) and steep lapse rates occurring downstream from a weak upper impulse were aiding in light shower activity over mainly Trinity, Humboldt, and Del Norte Counties this afternoon. The previously mentioned impulse is forecast to exit east away from NRN CA late tonight, and that will be accompanied by rapidly clearing skies and strong surface radiational cooling. Temperatures are forecast to plummet as a result, particularly across interior valleys, where lows will locally be in the low 20s. Farther west at the coast, low temperatures will be in the upper 20s to low 30s. Freeze and hard freeze warnings are in effect for the very cold temperatures.

Weak midlevel shortwave ridging is then forecast to develop across the region during the remainder of Sunday. Dry weather will be probable as a result...though this will be short-lived as a strong upper disturbance digs southward from WRN BC Sunday evening through Monday. The disturbance is forecast to rapidly occlude offshore from OR and NRN CA Monday afternoon and evening, with an associated surface frontal boundary approaching coastal portions of NWRN CA. South-southeast winds will quickly strengthen as the surface pressure gradient tightens and a 50-70 kt coastal barrier jet spreads east. A high wind watch has been issued for gusts to 60 mph occurring across portions of Humboldt, Trinity, and NRN Mendocino Counties valid 5pm Monday through 5am Tuesday.

A shield of stratiform precipitation is forecast to accompany the approaching front during Monday evening. Periods of moderate to locally heavy low-elevation rain will occur as a result, while mountainous areas above 2000 feet MSL experience accumulating snow. Peak snowfall intensity, with rates approaching 1 inch per hour, is expected to occur late Monday night and early Tuesday morning, with moderate rates occurring during the remainder of Tuesday, followed by low rates Wednesday morning into the afternoon. A winter storm watch remains in effect for heavy snow valid Monday afternoon through early Wednesday morning, and that watch appears to be on track for an upgrade to warning during the next 24 hours.

The occluded cyclone is forecast to move south of the EKA CWA Wednesday afternoon and evening. Post-cyclone shower activity is expected to dissipate Wednesday night, which will likely be accompanied by another morning of cold interior temperatures on Thursday. Thereafter, an additional round of precipitation is evident in model guidance during late week.


Northerly winds will slowly diminish through Sunday. A large NW swell will gradually subside through the weekend. Have left the existing Small Craft Advisories unchanged, with the N waters advisory ending early Sunday morning and the S waters ending around midnight Sunday night.

Strong southerly winds are expected early next week as a strong low and associated front approach the area. Expect gales by Monday afternoon with storm force gusts across the outer waters N of Cape Mendocino. Have hoisted a Storm Watch for the N outer waters and have tweaked the beginning and ending times of the existing Gale Watch. In the Gale Watch areas, have indicated occasional gusts to storm force. The strength of the winds will be highly dependent on the depth of the low pressure system and its proximity to the coast. In addition, the low may meander near the coastal waters before filling, which may prolong the gusty winds. Mariners should continue to monitor the latest forecasts regarding this system. /SEC

.EKA WATCHES/WARNINGS/ADVISORIES... CA... Freeze Warning from 2am to 9am PDT Sunday for CAZ101-103- 109-112.

Winter Storm Watch from Monday afternoon through late Tuesday night for CAZ102-104>108-110-111-113>115.

High Wind Watch from Monday afternoon through late Monday night for CAZ103>111.

Hard Freeze Warning from 2am to 9am PDT Sunday for CAZ110- 111-113>115.

NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 3am PDT Sunday for PZZ450-470.

Gale Watch from Monday afternoon through Tuesday morning for PZZ450-455-475.

Small Craft Advisory until midnight PDT Sunday night for PZZ455-475.

Storm Watch from Monday afternoon through late Monday night for PZZ470.