Monday, April19, 2021
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Marine Weather and Tides
Boonville, CA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:27AMSunset 7:55PM Monday April 19, 2021 3:26 PM PDT (22:26 UTC) Moonrise 10:40AMMoonset 1:16AM Illumination 55% Phase: First Quarter Moon; Moon at 8 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- 200 Pm Pdt Mon Apr 19 2021
.small craft advisory in effect until 9 pm pdt this evening...
.gale warning in effect from 9 pm pdt this evening through Tuesday evening...
Tonight..NW winds 25 to 30 kt with gusts up to 40 kt. Wind waves 9 to 10 ft, increasing to 10 to 12 ft after midnight. Mixed swell nw around 2 ft at 11 seconds and sw around 2 ft at 15 seconds.
Tue..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 10 to 12 ft. W swell around 2 ft at 11 seconds.
Tue night..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 6 to 7 ft. NW swell 10 to 12 ft at 11 seconds.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 8 to 10 ft at 11 seconds.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 8 to 10 ft at 10 seconds.
Thu..W winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 6 to 8 ft at 10 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 5 to 7 ft at 9 seconds and sw around 2 ft at 17 seconds.
Fri..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 3 to 5 ft and S around 2 ft.
Sat..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft. A chance of rain.
PZZ500 200 Pm Pdt Mon Apr 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Buoy observations show moderately gusty northwest winds, with near gale force gusts in the coastal waters south of point sur. Gale force gusts are expected to develop over the northern waters this evening. Gusty winds will persist through Tuesday evening. These winds will produce steep wind waves resulting in hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.


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 192145 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 245 PM PDT Mon Apr 19 2021

SYNOPSIS. Dry weather is expected to prevail through the work week before widespread rain chances increase this weekend. Interior daytime temperatures will generally remain above normal during the week. Some interior valleys will continue to be chilly during the early mornings. A passing disturbance will bring drizzle to portions of Humboldt County tonight into Tuesday morning. Isolated showers and thunderstorms will also be possible over Lake, northeast Mendocino and eastern Trinity Counties during the afternoon on Tuesday.

DISCUSSION. A transient upper level trough will induce a deeper marine layer with possible drizzle tonight through Tuesday morning. Cooler temperatures are expected for the interior on Tuesday as this shortwave trough traverses across the area. Cooling aloft associated with the trough will create sufficient instability during the day on Tuesday for possible showers and thunderstorms over the higher elevations of eastern Trinity, northeastern Mendocino and northern Lake counties. Convective allowing models, HRRR and NAM-nest, indicate convection developing as early as late tonight in Siskiyou County as a speed max traverses over Cape Mendocino. Warp around showers with the upper low may spread into the Trinity horn region around daybreak.

Steeper mid-level lapse rates and greater instability is forecast to develop with daytime heating on Tuesday in the wrap around NE flow behind the upper low. The environment is quite dry with precipitable water values forecast to reach 0.50 to 0.60 inches by afternoon. NAM BUFKIT soundings has CAPE values peaking near 230J/KG with equilibrium levels near 20kft Tuesday afternoon. SREF calibrated tstm probabilities are only around 5%, while HREF neighborhood probabilities increase during the afternoon primarily over eastern Mendocino and Lake counties. Confidence we will see storms is not high, however there are sufficient indicators that storms (albeit weak ones) will be possible for the higher terrain of eastern Mendocino, southeastern Trinity and northern Lake Counties Tuesday afternoon.

Warming is expected in the interior during the latter half of this week as a ridge aloft builds toward the area. GEFS 500mb means and deterministic GFS has another weak trough dropping down over the area in dry northerly flow on Wed. This shortwave is not as pronounced in ECMWF 500mb mean and deterministic solution. If the upper trough lingers over the area longer, slower warming will be the end result. Also, cooler overnight low temperatures with possible early morning frost in the interior valleys will be a distinct possibility. Coastal areas will not see any significant warming, due to the persistent northerly winds offshore and the steady influx of cool marine air each afternoon.

Ensemble guidance and cluster analysis continue to indicate rain probabilities increasing through the weekend. There is still about 40% variance on the timing and a lesser variance on the depth of the cold core trough. Multi-model calibrated ensemble indicates 40-60% chance for a tenth of an inch of rain or more over the weekend centered on the 24hr period from Saturday night through Sunday afternoon. This rain will likely be in the beneficial category even though there are subtle hints we could see convection once the cold core aloft arrives early next week (Mon or Tue).

AVIATION. Brief clearing at many coastal locations this afternoon will quickly be replaced by stratus once again as a deep saturated marine layer spreads inland across coastal Humboldt/Del Norte Counties, as well as portions of Mendocino County. Locally strong ascent due to strengthening low-level northwesterly flow near and upwind from the King Range will also favor drizzle across much of the Humboldt Bay area tonight, including KACV. Farther south at KUKI, the marine layer is forecast to be sufficiently deep to spread east across the coastal hills/ridges, such that IFR/LIFR ceilings may develop across Ukiah toward 12Z/20th.

MARINE. Little change in the marine forecast this afternoon. Surface high pressure over the NERN PAC is on track to strengthen during the next 24 hours. The pressure gradient will tighten in the vicinity of coastal NWRN CA and aid in the development of small craft northerlies across all coastal waters by late this evening. Winds are forecast to strengthen further to gale force over the outer waters, and recent hires guidance is indicating these winds pulling closer to the coast in the southern inners and locally near Pt. Saint George by Tuesday afternoon. Have extended the gale warning into the southern inners during Tuesday in response. Gusty north winds and steep hazardous seas will persist through Wednesday. Winds and seas are then forecast to weaken during the second half of the week.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory from 2 AM Tuesday to 11 PM PDT Wednesday for PZZ450.

Small Craft Advisory from 5 PM this afternoon to 11 AM PDT Tuesday for PZZ470.

Gale Warning from 11 AM Tuesday to 11 PM PDT Wednesday for PZZ470.

Small Craft Advisory until 11 PM PDT Wednesday for PZZ455.

Small Craft Advisory until 5 AM PDT Tuesday for PZZ475.

Gale Warning from 5 AM Tuesday to 11 PM PDT Wednesday for PZZ475.



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

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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 mi57 min WNW 7 G 14 53°F 1020.6 hPa
46014 - PT ARENA - 19NM North of Point Arena, CA 39 mi37 min 16 G 21 7 ft1021.1 hPa
BDXC1 43 mi81 min 50°F

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA20 mi31 minN 610.00 miFair81°F37°F21%1016 hPa

Link to 5 minute data for KUKI

Wind History from UKI (wind in knots)
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N9CalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW125N8N7N6
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N10NE5SW4CalmW3CalmCalmCalmNW3CalmCalmCalmCalmCalmCalmCalmSE346NW11

Tide / Current Tables for Arena Cove, California (2)
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Arena Cove
Click for Map
Mon -- 02:17 AM PDT     Moonset
Mon -- 03:47 AM PDT     4.78 feet High Tide
Mon -- 06:32 AM PDT     Sunrise
Mon -- 11:29 AM PDT     0.21 feet Low Tide
Mon -- 11:41 AM PDT     Moonrise
Mon -- 07:21 PM PDT     4.10 feet High Tide
Mon -- 07:56 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.744.44.74.84.643.12.21.30.60.30.30.61.21.92.73.43.94.14.13.93.73.6

Tide / Current Tables for Point Arena, California Current
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Point Arena
Click for Map
Mon -- 02:18 AM PDT     Moonset
Mon -- 02:30 AM PDT     0.31 knots Max Flood
Mon -- 04:50 AM PDT     -0.00 knots Slack
Mon -- 06:32 AM PDT     Sunrise
Mon -- 08:43 AM PDT     -0.96 knots Max Ebb
Mon -- 11:41 AM PDT     Moonrise
Mon -- 12:57 PM PDT     0.00 knots Slack
Mon -- 04:09 PM PDT     0.69 knots Max Flood
Mon -- 07:43 PM PDT     -0.00 knots Slack
Mon -- 07:56 PM PDT     Sunset
Mon -- 09:37 PM PDT     -0.36 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.20.30.30.2-0-0.3-0.6-0.9-0.9-0.8-0.5-0.300.30.60.70.70.50.2-0.1-0.3-0.4-0.3

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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