Sunday, September20, 2020
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Marine Weather and Tides
Boonville, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:58AMSunset 7:13PM Sunday September 20, 2020 4:41 AM PDT (11:41 UTC) Moonrise 9:49AMMoonset 8:36PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 201 Am Pdt Sun Sep 20 2020
.small craft advisory in effect from this afternoon through Monday evening...
Today..NW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon. Wind waves 1 to 2 ft, increasing to 3 to 4 ft this afternoon. NW swell 4 to 6 ft at 8 seconds and sw around 2 ft at 15 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 5 to 6 ft at 7 seconds and sw around 2 ft at 21 seconds.
Mon..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 5 to 6 ft at 10 seconds and sw around 2 ft at 20 seconds.
Mon night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell 5 to 6 ft at 9 seconds and sw around 2 ft at 19 seconds.
Tue..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 18 seconds.
Tue night..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 11 seconds and sw around 2 ft at 18 seconds.
Wed..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft and sw around 2 ft.
Thu..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 8 to 10 ft and sw around 2 ft.
PZZ500 201 Am Pdt Sun Sep 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A broad area of surface high pressure over the eastern pacific will keep breezy north to northwest winds over the northern waters through Monday evening. Generally light to locally moderate winds expected elsewhere. Mixed seas will persist with a shorter period northwest swell and a longer period southwest swell arriving today. Expect northwest swell to build late this week.


7 Day Forecast for Marine Location Near Boonville, CA
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location: 38.89, -123.38     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 201102 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 402 AM PDT Sun Sep 20 2020

SYNOPSIS. Warm and dry conditions are expected over the next few days before the next chance of rain arrives mid to late week.

DISCUSSION. A zonal flow pattern remains entrenched over northwest California this morning, supporting generally quiet weather conditions across the area. A stratus deck has managed to form along the Humboldt Coast and expand into the Eel River Valley overnight, and is currently creeping northward towards Crescent City. Today should be the warmest day of the week across the interior as 850 mb temperatures climb to 15-18 degrees C, producing afternoon highs in the upper 80s to low 90s F. Temperatures on the North Coast will bear watching this afternoon as some of the Hi-Res guidance keeps the stratus deck around well into the afternoon in the vicinity Humboldt Bay. This scenario seems at least somewhat plausible given a weak onshore flow regime, although the relatively shallow nature of the marine layer as seen on profiler data suggests clouds will still eventually scatter out and allow temperatures to approach 70 again in the Eureka area.

A weak shortwave trough crossing the Oregon Coast on Monday will drop temperatures by a few degrees compared to today, with benign warm and dry conditions persisting into the middle of the week as the area increasingly comes under the influence of southwest flow aloft ahead of a broad upper level trough developing over the NE Pacific. The first chance for rain associated with this system looks to come late Wednesday into Thursday as a front approaches the northern half of the area. Still a bit early to try to nail down QPF amounts, but there looks to be a decent chance for wetting rain for at least Del Norte and northern Humboldt, with precipitation chances diminishing with south and eastward extent. Minimal shower potential could then linger over the northern half of the area through Friday as the parent trough sends several pieces of energy into the Pacific NW.

Looking at next weekend and beyond, ensemble guidance and cluster analysis are increasingly hinting at another strong ridge developing over the western US, which could point to another stretch of hot and dry weather across northwest CA as we move into the end of September. /CB

AVIATION. Stratus is bringing IFR Conditions to the Humboldt coast and the Eel River valley this morning. It is moving north towards KCEC as well this morning and expect it will move in there this morning. This stratus is expected to push back toward the coast through morning with KACV likely clearing around 18 to 20Z. The drier weather and northerly winds has brought a return of some smoke that is reducing VIS and CIG in the interior valleys of Mendocino county. For now is staying aloft at KUKI, but as mixing starts to increase this morning it will likely mix down to the surface. The HRRR smoke model is also showing this. Late in the afternoon this smoke is expected to push off to the east as the diurnal winds become westerly. At the coast an approaching shortwave will bring more onshore flow and stratus to the area. This will likely impact KACV early in the evening and KCEC by late evening with conditions remaining IFR or LIFR overnight. MKK

MARINE. Modest northerly winds have returned to much of the waters this morning. A few local areas near the coast are seeing a flow reversal and some southerly winds. Winds beyond 10 NM will peak this morning and then start to diminish in the northern waters, although winds will remain breezy over the southern waters tonight. The winds and waves in the southern inner waters will approach small craft advisory criteria, however at this point it looks like it will mainly be in the vicinity of Cape Mendocino and beyond 10 NM that will see winds over 21 KT.

Monday an approaching shortwave trough will continue to weaken the northerly winds. It is possible the small craft advisory in the southern outer waters will need to be extended through the afternoon, but for now it looks like the seas in more than half of the area will drop below 6 feet by midday. Late in the day on Tuesday the winds are expected to become southerly as an upper level trough starts to moving into the Pacific Northwest. Southerly winds will increase and become more widespread on Wednesday. The northern outer waters is expected to see them increase to 10 to 20 KT. there is better agreement that widespread southerly winds will be in place.

Late in the week models are struggling to resolve some shortwave features that will bring periods of southerly winds. Winds are expected to generally remain light, but confidence is low on the details. High pressure is expected to start building in for the weekend with increasing northerly winds again. Current models show them remaining light on Saturday and increasing on Sunday, but the timing will likely change as it gets closer.

Thursday the ENP model is showing the first large swell of the season moving into the waters. The current model run shows this peaking around 14 feet at 15 seconds Thursday. This is due to storm currently in the southern Bering sea that is expected into the Gulf of Alaska early this week. The ECMWF and GFS operational runs remain in generally good agreement on the track of this low pressure. It looks like the large wave heights may be at least in part due to a dynamic fetch. This makes it easy for the models to be significantly off on the waves heights if the track of the low shifts even slightly. MKK

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 7 PM PDT this evening for PZZ470.

Small Craft Advisory until 9 AM PDT Monday for PZZ475.



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 18 mi54 min E 2.9 G 6 59°F 53°F1012.5 hPa
46014 - PT ARENA - 19NM North of Point Arena, CA 39 mi32 min NNW 18 G 21 62°F1012.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 44 mi32 min NNW 12 G 14 57°F 55°F1011.7 hPa56°F

Wind History for Arena Cove, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA20 mi46 minN 010.00 miOvercast58°F51°F78%1012.4 hPa

Link to 5 minute data for KUKI

Wind History from UKI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmN4CalmCalmCalmN8NW8NW8NW9NW4NE4N5CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalm33CalmW7
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NW9W84N9N6NW5CalmCalmCalmCalmNW3Calm
2 days agoCalmCalmCalmCalmCalmCalm3Calm3S6W12
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Tide / Current Tables for Arena Cove, California (2)
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Arena Cove
Click for Map
Sun -- 01:40 AM PDT     5.57 feet High Tide
Sun -- 07:01 AM PDT     Sunrise
Sun -- 07:37 AM PDT     1.21 feet Low Tide
Sun -- 10:50 AM PDT     Moonrise
Sun -- 01:47 PM PDT     6.31 feet High Tide
Sun -- 07:14 PM PDT     Sunset
Sun -- 08:24 PM PDT     0.05 feet Low Tide
Sun -- 09:37 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.75.45.55.14.131.91.31.31.82.94.15.36.16.35.84.83.31.80.70.10.20.92

Tide / Current Tables for Point Arena, California Current
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Point Arena
Click for Map
Sun -- 02:48 AM PDT     -0.00 knots Slack
Sun -- 05:28 AM PDT     -1.18 knots Max Ebb
Sun -- 07:01 AM PDT     Sunrise
Sun -- 08:51 AM PDT     0.00 knots Slack
Sun -- 10:50 AM PDT     Moonrise
Sun -- 11:44 AM PDT     1.07 knots Max Flood
Sun -- 02:42 PM PDT     -0.00 knots Slack
Sun -- 05:48 PM PDT     -1.48 knots Max Ebb
Sun -- 07:14 PM PDT     Sunset
Sun -- 09:30 PM PDT     0.00 knots Slack
Sun -- 09:37 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.210.5-0.1-0.8-1.1-1.1-0.8-0.40.10.611.10.80.4-0.2-0.8-1.3-1.5-1.2-0.8-0.30.30.8

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Sacramento, CA
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