Thursday, July9, 2020
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Marine Weather and Tides
Eureka, CA

Version 3.4
NOTICE
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 5:52AMSunset 8:51PM Thursday July 9, 2020 3:57 AM PDT (10:57 UTC) Moonrise 11:02PMMoonset 9:23AM Illumination 84% Phase: Waning Gibbous; Moon at 19 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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PZZ415 Expires:201909161915;;301382 Fzus76 Keka 161819 Mwseka Marine Weather Statement National Weather Service Eureka Ca 1119 Am Pdt Mon Sep 16 2019 Pzz410-415-450-470-161915- 1119 Am Pdt Mon Sep 16 2019
.isolated strong Thunderstorms over the coastal waters... The areas affected include... Coastal waters from point saint george to cape mendocino ca out 60 nm... At 1114 am, doppler radar indicated a few strong Thunderstorms, capable of producing wind gusts to around 30 knots, from 5 nm northwest of orick to 45 nm west of patrick's point. These storms are moving southeast at 10 knots. Precautionary/preparedness actions... Mariners can expect gusty winds to around 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms passes. && lat...lon 4174 12416 4145 12406 4123 12411 4114 12416 4105 12415 4106 12414 4102 12411 4070 12426 4071 12426 4058 12435 4083 12572 4096 12565 4178 12460 4178 12426
PZZ400 254 Am Pdt Thu Jul 9 2020
Synopsis for northern california waters..Moderate to locally strong northerly winds and steep seas will persist south of cape mendocino through the end of the week. North winds and seas to the north of cape mendocino will ease somewhat today and Friday, but will remain gusty, particularly across the outer waters.


7 Day Forecast for Marine Location Near Eureka, CA
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location: 40.81, -124.14     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 082155 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 255 PM PDT Wed Jul 8 2020

SYNOPSIS. Seasonably warm temperatures across the interior will tend to heat up gradually heading into the weekend, and will be accompanied by sunny skies. Marine air and onshore breezes will keep coastal areas seasonably cool. Areas of coastal stratus will redevelop for the next couple of mornings, particularly over the Humboldt Bay region and in the Eel River Valley, and may be a bit more persistent late this week.

DISCUSSION. It has turned out mostly clear and sunny across almost all of northwest California this afternoon. Stratus was a bit more persistent into the midday hours in some lucky locations along the immediate coast, thanks to a somewhat stronger inversion from increasing temperatures aloft. Otherwise, a stronger pressure gradient along the coast is aiding increasing northerly breezes, with downright blustery conditions found along some of the coastal headlands, particularly near Cape Mendocino southward. These winds will ease heading into Thursday, and model guidance is indicating expanding stratus tonight for all but the northern Mendocino and southern Humboldt coast, which may be more persistent with those winds tending lighter on Thursday. Areas of coastal stratus will likely persist for the same areas through the weekend as ridging tends to build in from the south. This pattern will tend to keep the marine layer shallower, with fog hugging the immediate coast more than inland river valleys, but may also result in low clouds persisting into the afternoon at times.

Plentiful sunshine will be found in the interior every day for the next 7 day. Interior high temperatures will rise into the 90s for the hotter valleys on Thursday. A shortwave trough passing mainly to our north will keep temperatures from heating up to much more through the end of the week. That said, statistical guidance, deterministic models and ensemble systems (GEFS, EPS and CMCE) continue to indicate increasing 850mb temperatures on Friday, generally around 21-23C. The probability of 95F or more at Ukiah is around 22% on Friday. That probability at Ukiah increases to 60-70% over the weekend. Probability of 100F or more at Ukiah increases to 20% Sunday and 30-40% early to mid next week. Stronger warming and increasing heat risk will be possible throughout the interior early to mid next week. There is still a great deal of variance in the pattern Monday through Wednesday due to the depth and eastward progression of another trough in the westerlies across the Pacific NW. This trough may linger over the area and suppress the hot four corners ridge from building north, perhaps keeping temperatures from reaching truly oppressive values in our region.

AVIATION. Offshore stratus consolidated early this afternoon with Eel river valley stratus that had advected and settled inland overnight. What was already a shallow marine layer is expected to diminish mostly although low clouds and overcast conditions have lingered at KACV. As the day progresses most of the stratus will scatter out with the typical diurnal cycle. Gusty north winds are expected near KCEC early evening and should switch to a southern regime late tonight, accompanied with lower ceilings. VFR conditions prevail for KUKI with gusty north winds possible this evening. /EYS

MARINE. North winds of 20 to 25 kt have persisted across the Northern Outer waters today as high pressure builds into Oregon and the pressure gradient tightens up to Cape Blanco. Portions of the waters near and south of Cape Mendocino may see wind gusts near 35 kt later this afternoon and into the evening. Steep seas of around 7 feet at 7 seconds should be expected in this area, with 8 to 9 feet locally downwind of the Cape. Another low pressure trough will act to break down the ridge of high pressure for Thursday and Friday, allowing northerly winds and seas to relax somewhat to the north of Cape Mendocino. Meanwhile, Small Craft Advisories have been extended across the southern outer waters into Friday morning. Otherwise, very little will change in this generally very persistent pattern of northerly wind and seas remaining roughest on the lee side of Cape Mendocino through the weekend and even into next week.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 5 AM PDT Thursday for PZZ470.

Small Craft Advisory until 5 PM PDT Thursday for PZZ455.

Small Craft Advisory until 9 AM PDT Friday 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
HBYC1 - 9418767 - North Spit, CA 5 mi82 min 51°F1016.7 hPa
NJLC1 6 mi100 min W 3.9 G 3.9 55°F
46244 - Humboldt Bay, North Spit, CA 13 mi62 min 56°F6 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 23 mi168 min N 9.7 G 14 55°F1017.3 hPa
46213 - Cape Mendocino, CA (094) 47 mi32 min 54°F6 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Arcata / Eureka, Arcata Airport, CA13 mi65 minESE 410.00 miOvercast58°F51°F78%1016.7 hPa
Fortuna Rohnerville Airport, CA18 mi88 minWNW 65.00 miOvercast55°F53°F94%1016.9 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrSE3SE3SE3E4CalmW44W5W5NW6NW9NW14
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1 day agoCalmE4CalmCalmNW4NW4NW10NW12NW16NW18NW17
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Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Thu -- 03:16 AM PDT     7.16 feet High Tide
Thu -- 05:53 AM PDT     Sunrise
Thu -- 09:57 AM PDT     -0.26 feet Low Tide
Thu -- 10:23 AM PDT     Moonset
Thu -- 05:15 PM PDT     6.39 feet High Tide
Thu -- 08:49 PM PDT     Sunset
Thu -- 10:10 PM PDT     3.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.95.96.77.176.14.731.30.1-0.30.11.12.43.95.166.46.25.54.53.63.23.3

Tide / Current Tables for Humboldt Bay (south jetty), California (expired 1984-12-31)
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Humboldt Bay (south jetty)
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Thu -- 02:50 AM PDT     5.93 feet High Tide
Thu -- 05:54 AM PDT     Sunrise
Thu -- 10:01 AM PDT     -0.46 feet Low Tide
Thu -- 10:24 AM PDT     Moonset
Thu -- 04:56 PM PDT     5.19 feet High Tide
Thu -- 08:49 PM PDT     Sunset
Thu -- 10:14 PM PDT     2.83 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.35.25.85.95.64.73.52.10.8-0.1-0.5-0.10.723.34.355.254.43.73.12.83

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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Wind Forecast for Eureka, CA (6,6,7,8)
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Ground Weather Radar Station Eureka, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.