Saturday, December7, 2019
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Marine Weather and Tides
Manchester, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:17AMSunset 4:51PM Saturday December 7, 2019 2:08 PM PST (22:08 UTC) Moonrise 2:35PMMoonset 2:39AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 928 Am Pst Sat Dec 7 2019
.small craft advisory in effect until 9 pm pst this evening...
Today..S winds 20 to 30 kt with gusts up to 35 kt. Wind waves 11 to 13 ft, decreasing to 8 to 9 ft this afternoon. W swell 7 to 8 ft at 13 seconds. A slight chance of Thunderstorms this morning. Showers. A chance of Thunderstorms this afternoon.
Tonight..SW winds 10 to 15 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 12 seconds. Showers likely.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 11 seconds. A chance of rain.
Sun night..N winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 10 seconds.
Mon..NW winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 15 seconds.
Mon night..NW winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 15 seconds and S around 2 ft at 16 seconds.
Tue..E winds around 5 kt. Wind waves 1 ft. W swell 5 to 7 ft and S around 2 ft.
Wed..E winds around 5 kt. Wind waves 1 ft. W swell 6 to 8 ft and S around 2 ft. Winds and wind waves higher in and near Thunderstorms.
PZZ500 928 Am Pst Sat Dec 7 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A secondary frontal boundary will move through the coastal waters today. Scattered Thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.


7 Day Forecast for Marine Location Near Manchester, CA
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location: 38.95, -123.73     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 071327 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 527 AM PST Sat Dec 7 2019

SYNOPSIS. Numerous showers, some with heavy downpours, will continue across northwest California through this evening. Showers will then diminish heading into Sunday, with high pressure bringing dry weather to start the week. A weak front will threaten to bring some light rainfall around Tuesday.

DISCUSSION. Little has changed with respect to the overall forecast, with the wettest day of this week and probably the upcoming week in store for most of northwest California. Vertically-stacked low pressure offshore will continue to gradually fill and weaken as it approaches our coast today, but that will not stop it from bringing rounds of showers with occasional downpours. A well- defined shortwave rotating around the low with an associated mesoscale surface low rotated past Cape Mendocino and northward off the Redwood coast overnight, with a round of heavy showers. Even a few thunderstorms clipped the area near the cape, and residents of Petrolia or Ferndale may have heard some rumbles late last night.

Another similar shortwave can be seen in satellite imagery offshore, and will arrive late this morning into the midday hours, enhancing shower activity across our area. The main upper-trough and surface low will then track onshore heading into tonight. In between these waves, particularly early this morning, some areas will see a relative lull in the shower activity. However, even then there will still be scattered showers around, especially across the orographically-favored areas of southeastern Humboldt and Mendocino counties. Most of the region has seen 1 to 2 inches of rainfall up to this point, and will see another 1 to 2 inches through tonight. The exception will continue to be along the coast of Humboldt and Del Norte counties, where downsloping and divergent southerly flow around Cape Mendocino will keep rainfall amounts under an inch. Meanwhile, southwest-facing high terrain like South Fork Mountain and the King Range may see an additional several inches of rain before the day is out, bringing localized storm totals to 7 or 8 inches. Would not completely rule out a brief period of sunshine in between bouts of showers along the coast, but expect an overall mostly cloudy day. There will continue to be enough instability for isolated thunderstorms, especially around the Mendocino coast. Would not rule out a few strikes near the Humboldt coast or across interior Mendocino either while this next shortwave rolls through toward midday into this afternoon.

Meanwhile, winds have continued to be gusty at times, particularly across the coastal ridges and near shower activity. Have dropped the earlier Wind Advisory as it appears the stronger low-level winds will be easing from this point forward. That said, high- resolution models show another shot of stronger winds aloft moving through around midday with this shortwave, and would expect there will be some gusts in the 40 to 50 mph range across exposed ridgetops with this. Even some lower elevation and coastal locations will see brief gusts of 25 to 35 mph near the heaviest showers.

Later Saturday night into Sunday morning shower activity will diminish in coverage and intensity rather dramatically as drier and more stable air pushes in. Some showers will linger into Sunday morning over the interior mountains, but it is looking like a dry day for most of the coast. A fair amount of sunshine should be expected, especially heading into the afternoon. Inland areas will be a bit cloudier, but even there clouds should begin to scatter later in the day. Winds will be light and high temperatures will be seasonable as well. Expect some valley fog heading into Monday, but otherwise a dry and generally sunny day for most of our region with a steep ridge of high pressure overhead. Models have trended a bit faster with the next weak front. There is a good chance coastal areas will get wet before sunset on Tuesday. The weather for rest of the mid and late week period is uncertain. While the National Blend keeps low chances of rain across much of our forecast area, especially near the Oregon border, some of the deterministic guidance has been keeping most of our area dry. Stay tuned to later forecasts. In any case, it looks like relatively benign weather through the week with seasonable temperatures and high snow levels. /AAD

AVIATION. Southerly winds are expected to hold today then weaken this evening across the region as a storm system exits Northwestern California tonight. Rain and MVFR ceilings and visibilities are likely across all TAF sites, with intermittent drops to IFR possible should a heavier shower pass directly overhead. A relatively small shortwave embedded in the system's circulation should move onshore along the North Coast early this afternoon, which should increase shower activity in this area. After this heavier band, lighter showers should continue to weaken, with improving conditions possible by early tomorrow morning. /TDJ

MARINE. Southerly winds should perform one last gasp this afternoon as the final short wave embedded in this storm's circulation moves onshore along the North Coast. Hi-res model guidance is keying in on a small core of 30 kt sustained winds briefly impacting the nearshore waters, beginning at the south end of the lost coast and tracking northward as the embedded short wave sweeps north toward Oregon. Thunderstorms and potentially short lived Gale Force winds will be possible while this passes overhead early this afternoon. However due to the short duration, small areal coverage and model dissonance regarding placement, strength and duration of these winds, have decided against issuing gale warning at this time.

Winds then trend down significantly tonight and switch to light northerly tomorrow before clocking back to southerly early next week and holding there for at least a few days. Southerly short period seas drop dramatically in response today, however the W swell currently moving through the waters at 9 ft at around 12 seconds should feel a small reinforcing pulse this afternoon from the WSW, enough to keep seas above 10 ft for most of the coastal waters through late this evening. After this decays tomorrow afternoon, seas remain relatively quiet for a few days until both another round of southerlies begins and a new W swell move through sometime around mid- week. /TDJ

EKA WATCHES/WARNINGS/ADVISORIES. CA . Flash Flood Watch through this afternoon for CAZ107-110-113.

NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 3 PM PST this afternoon for PZZ450.

Small Craft Advisory until 3 AM PST Sunday for PZZ455-475.

Small Craft Advisory until 9 PM PST this evening for PZZ470.



Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka

For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ANVC1 - 9416841 - Arena Cove, CA 3 mi57 min S 5.1 G 11 57°F 54°F1009.9 hPa
46014 - PT ARENA - 19NM North of Point Arena, CA 23 mi29 min S 14 G 18 57°F 55°F1008.4 hPa56°F

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA31 mi73 minS 12 G 213.00 miLight Rain59°F53°F81%1007.9 hPa

Link to 5 minute data for KUKI

Wind History from UKI (wind in knots)
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2 days agoSW3CalmSW3CalmCalmW3CalmW3CalmCalmCalmN3N3CalmSE3CalmN3CalmS3S3SE4SE7SE6SE9

Tide / Current Tables for Point Arena, California
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Point Arena
Click for Map
Sat -- 12:59 AM PST     1.60 feet Low Tide
Sat -- 02:39 AM PST     Moonset
Sat -- 07:20 AM PST     Sunrise
Sat -- 07:22 AM PST     5.50 feet High Tide
Sat -- 02:19 PM PST     1.02 feet Low Tide
Sat -- 02:34 PM PST     Moonrise
Sat -- 04:52 PM PST     Sunset
Sat -- 08:14 PM PST     4.01 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.61.82.53.34.355.55.44.94.13.12.11.411.11.62.33.13.743.93.52.9

Tide / Current Tables for Point Arena, California Current
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Point Arena
Click for Map
Sat -- 02:15 AM PST     0.00 knots Slack
Sat -- 02:39 AM PST     Moonset
Sat -- 05:15 AM PST     0.81 knots Max Flood
Sat -- 07:20 AM PST     Sunrise
Sat -- 08:16 AM PST     -0.00 knots Slack
Sat -- 11:11 AM PST     -1.01 knots Max Ebb
Sat -- 02:34 PM PST     Moonrise
Sat -- 03:13 PM PST     0.00 knots Slack
Sat -- 04:52 PM PST     Sunset
Sat -- 06:05 PM PST     0.76 knots Max Flood
Sat -- 09:00 PM PST     -0.00 knots Slack
Sat -- 11:25 PM PST     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-0.4-0.10.30.60.80.80.50.1-0.4-0.8-1-1-0.8-0.5-0.10.30.70.80.70.40-0.4-0.7

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Eureka, CA (17,4,5,8)
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Ground Weather Radar Station Sacramento, CA
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