Point St. George to Cape Mendocino CA from 10 to 60 NM Marine Forecast
|Tonight...N Winds 10 To 20 Kt. Waves N 8 Ft At 7 Seconds. Patchy Fog.|
|Mon...W Winds 5 To 10 Kt. Waves N 6 Ft At 5 Seconds. Rain Likely.|
|Mon Night...Se Winds 5 To 10 Kt. Waves Nw 4 Ft At 12 Seconds. Slight Chance Of Rain.|
|Tue...N Winds 5 To 10 Kt. Waves W 4 Ft At 11 Seconds...And Nw 2 Ft At 18 Seconds.|
|Tue Night...Nw Winds 10 To 15 Kt. Waves W 5 Ft At 11 Seconds... And Nw 3 Ft At 16 Seconds.|
|Wed...N Winds 10 To 20 Kt. Waves W 8 Ft At 10 Seconds...And Nw 3 Ft At 15 Seconds.|
|Thu...Nw Winds 15 To 20 Kt. Waves Nw 13 Ft At 14 Seconds.|
|Fri...N Winds 10 To 15 Kt. Waves Nw 8 Ft At 13 Seconds.|
| Area Forecast Discussion|
National Weather Service Eureka CA
225pm PST Sunday Dec 5 2021
Periods of light rain are forecast to occur across northwest California Monday, Wednesday, and Thursday. Freezing temperatures are then anticipated Friday and Saturday morning, followed by a potential winter storm entering the region on Sunday.
Northwest California was positioned between an area of strong deep-layer subsidence to the south, and moist west- southwesterlies to the north. An upper disturbance embedded within the westerlies to the north is forecast to move east across the PACNW during the next 24 hours. That feature will aid in increasing cloudiness over the EKA CWA tonight, which will diminish the chance for interior valley frost and radiational fog development. In addition, short-term model guidance shows light rain spreading across the region Monday morning into the night. Shortwave ridging and a period of dry weather is then forecast to occur on Tuesday. The next in a series of upper waves is expected to impact the PACNW on Wednesday resulting in additional light rain chances mainly in Humboldt and Del Norte Counties. Continued west coast troughing occurs into Thursday and aids in an additional round of light/beneficial rain.
A midlevel ridge is forecast to build over the region Thursday night through Friday night. That feature will support clearing skies and strong radiational cooling over much of NWRN CA, and when combined with a polar airmass spreading south, will yield a 70-100% chance of freezing interior valley temperatures Friday morning based on ensemble forecast guidance. Additional freezing temperatures are probable Saturday morning. Thereafter, the potential for impactful winter weather increases Sunday into the following work week as a large upper trough amplifies over the NERN PAC. Deterministic model solutions shows varying trough evolutions, but ensemble forecast guidance supports a multi-day period of heavy rain, gusty south winds, and heavy mountain snow beginning Sunday. At this time, the probability of 24 hour rainfall totals in excess of 1 inch is 30 to 50%, south winds gusting in excess of 40 mph is around 40%, and warning level snowfall for elevations above 3000 feet in Trinity County is 60%.
Northerly winds and steep seas will peak this evening and then steadily diminish through the day on Monday as a weak front approaches from the northwest. Northerly winds and short period waves are forecast to increase again toward the latter portion of week, though locally moderate breezes are expected everyday south of Cape Mendocino. A nearly squared NW swell is forecast to build toward the latter portion of the week, Thu-Fri that is.
.EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 6am PST Monday for PZZ455-470.
Small Craft Advisory until 3pm PST Monday for PZZ475.