Marine Forecasts

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7 Day Forecast for Marine Location Near Manila, CA

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Area Discussion for - Eureka, CA

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FXUS66 KEKA 071240 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 440 AM PST Sun Mar 7 2021

SYNOPSIS. A weak weather system will bring light rain and snow to areas in the north this morning, otherwise dry conditions are expected today. Additional light rain and snow showers will continue through Wednesday before dry weather returns for the second half of the week. More rain is possible for the weekend.

DISCUSSION. A weak front is bringing light rain to Humboldt and Del Norte counties this morning. This is expected to come to an end fairly quickly this morning as the front moves inland. The front is expected to mostly dissipate before it gets to Trinity and Mendocino counties. Snow levels are around 2,500 feet this morning and up to an inch of snow is possible. The clouds may linger into the afternoon. Farther south in Mendocino and Lake counties skies are mainly clear this morning and that has allowed temperatures to drop into the upper 20s to mid 30s in the valleys. Skies are expected to remain clear this afternoon in these areas.

Tonight clouds are expected to move into the area ahead of an shortwave level trough that is moving around an upper level low in the Gulf of Alaska. This is expected to bring enough clouds to the north coast to keep temperatures above freezing, although this will need to be monitored as it gets closer in case the clouds are slower than expected. Farther south frost and freezing temperatures are forecasted for Mendocino and Lake county again tonight, however if the cloud cover comes in thicker than expected it may keep temperatures several degrees warmer than is currently forecast.

Monday an upper level low continues to slowly sag to the south parallel to the west coast. This allows a shortwave trough moving around the low to bring some rain and snow showers to the area. There is quite a bit of cold air aloft with this system and this will bring some instability and steepen lapse rates to over 8C/km in the late morning and afternoon. There is expected to be enough instability to bring some small hail and possible thunder over the waters and to the coastal areas. Significant accumulating hail is not expected as this looks to occur in the warmest time of the day temperatures aloft are not quite cold enough. Snow levels are expected to be around 2,000 feet when the precip starts, lifting to around 2,500 or 3,000 feet in the afternoon. Snow amounts are generally expected to be 1 to 3 inches with locally higher amounts above 4,000 feet. Due to the showery nature expected with this precip confidence is low on the snow amounts so have held off on issuing a winter weather advisory.

Monday night and Tuesday morning there is some agreement in the models that there may be a break in the precip between shortwaves. Tuesday afternoon the showers look to increase in coverage again as another shortwave moves around the low. Snow levels look to be around 2,500 to 3,000 feet and there may be another round of thunderstorms and small hail Tuesday afternoon and evening. The best chances look to be near the coast, but it could move inland as well. Tuesday night the upper low continues to drop south and some models are indicating it may move onshore. Wednesday the models are struggling with the exact location of the low making confidence low on where the precip will be. Overall precip chances start to diminish, especially in the north.

Thursday and Friday high pressure starts to builds into the area bringing clearing skies and drier conditions. Temperatures aloft will still be fairly cold so this will allow frost and freezing temperatures in areas that clear out overnight. This will continue into Saturday morning although there may be some moderation in the temperatures. Afternoons will be mostly sunny and fairly warm. Late Saturday or Sunday another weather system there is the potential for another weather system to impact the area. MKK

AVIATION. A weak frontal passage is bringing light rain and intermittent MVFR conditions to KCEC and KACV early this morning. Rain should come to an end by shortly after daybreak, with conditions rapidly improving to VFR across NW CA for the remainder of the TAF period. /CB

MARINE. A weak front is bringing a brief period of enhanced southerlies to the northern waters very early this morning. Otherwise, light westerly breezes will fill in behind the front today, perhaps with some slightly stronger northwest breezes developing south of Cape Mendocino in the afternoon. A fresh westerly swell will build into the waters later today at around 15- 17 ft at 16 seconds, dominating the sea state and supporting Small Craft Advisories through much of the first half of the week. Periods of stronger southerly breezes will also continue through the first half of the week as weak fronts occasionally brush the northern half of the area. It appears a northerly wind regime may develop during the second half of the week as high pressure builds over the region. /CB

EKA WATCHES/WARNINGS/ADVISORIES. CA . Frost Advisory until 9 AM PST this morning for CAZ109-112-113- 115.

Freeze Warning until 9 AM PST this morning for CAZ110-111-114.

NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 11 AM PST Tuesday for PZZ470.

Small Craft Advisory from 3 PM this afternoon to 11 AM PST Tuesday for PZZ455.

Small Craft Advisory from noon today to 11 AM PST Tuesday for PZZ450-475.



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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
HBXC1	4 mi	40 min			49°F
HBYC1 - 9418767 - North Spit, CA	5 mi	94 min			48°F		1023.8 hPa
NJLC1	6 mi	106 min	NNW 4.1 G 4.1	46°F
46244 - Humboldt Bay, North Spit, CA	11 mi	44 min			52°F	8 ft
TDPC1	16 mi	40 min			49°F
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA	20 mi	40 min	NNE 3.9 G 7.8	48°F	51°F		1023.8 hPa	40°F
46213 - Cape Mendocino, CA (094)	48 mi	44 min			51°F	9 ft

Wind History for North Spit, Humboldt Bay, CA

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Arcata / Eureka, Arcata Airport, CA	12 mi	77 min	NW 8	10.00 mi	Mostly Cloudy	49°F	38°F	66%	1024 hPa
Fortuna Rohnerville Airport, CA	19 mi	75 min	NNW 8	10.00 mi	Mostly Cloudy	50°F	37°F	62%	1023.4 hPa

Link to 5 minute data for KACV

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Tide / Current Tables for Samoa, Humboldt Bay, California

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Tide / Current Tables for Humboldt Bay Entrance, California

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