Friday, July10, 2020
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Marine Weather and Tides
Weaverville, 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 5:46AMSunset 8:43PM Thursday July 9, 2020 10:29 PM PDT (05:29 UTC) Moonrise 10:56PMMoonset 9:18AM Illumination 77% 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 858 Pm 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 into the weekend. North winds and seas to have eased the north of cape mendocino, but brief periods of gustiness can still be expected in the afternoon and early evening hours.


7 Day Forecast for Marine Location Near Weaverville, CA
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location: 40.78, -122.83     debug


Area Discussion for - Eureka, CA
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FXUS66 KEKA 092228 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 328 PM PDT Thu Jul 9 2020

SYNOPSIS. Afternoon temperatures are expected to gradually rise the next few days across the interior. Highest temperatures will be observed over eastern Mendocino and much of Lake County where highs may reach the low 100s. Marine air and ocean breezes will keep coastal areas seasonably cooler. Stratus will be more extensive and persistent for coastal areas of Humboldt and Del Norte counties today. The Mendocino coast will enjoy more sunshine, however some stratus will be possible near the shoreline.

DISCUSSION. The marine layer continues to gradually deepen while a shortwave trough helps to amplify this process. The net result will be the low clouds linger into the late morning early afternoon while some patchy coastal drizzle is possible this weekend. It is shaping up to be a cloudier weekend but south of the cape..the Mendocino coast, may see a little less marine influence. Northerly winds offshore appear sufficient to mix out the stratus in the afternoon. Coastal stratus is expected to stick around through the weekend, though it should clear out away from the shoreline in the afternoons. Interior temperatures will remain near normal today, generally in the 80s to lower 90s in the valleys. Interior highs are expected to warm above normal in Lake, Mendocino and Trinity counties on Friday. For interior Del Norte and Humboldt counties the warming does not look quite as strong, with marine air and onshore winds generally moderating afternoon temperatures. Heat risk will increase to moderate levels in Mendocino, Lake and Trinity counties this weekend and early next week. Right now, the warming does not appear too extreme, with temperatures peaking in the upper 90's to around 103F. A trough aloft over the Pacific NW will likely keep the hot four corners ridge from building firmly over the area. Probability of 100F or more at Ukiah is 10% on Friday, increasing to 16% on Sunday and then to 20-30% Mon-Wed. On Tue, one of the warmest days in our current forecast at Ukiah, the mean from the ensemble blend is 98F. There is 5 degrees of spread, so it may be as low as 93F to as high as 103F. There is still a great deal of variance in the pattern late next week, with even larger spreads in 850mb temperatures. The overall trend appears to be a slow moderation, but still above normal.

An upper ridge, centered over the four corners region, will expand north and westward on Friday. The warmer air mass aloft should lead to a shallower and more compressed marine layer on Friday.

AVIATION. A widespread marine layer continue to affect most of coastal terminals in Humboldt and Del Norte county. Late in the evening through the early morning hours a weak weather system will move through the area, potentially serving to deepen the marine layer to a depth of nearly 2,000 feet. Otherwise, stratus is dissipating in some coastal areas this afternoon. VFR conditions at KACV is only expected for a few hours this afternoon with the stratus returning quickly in the late afternoon or evening. Meanwhile, IFR to MVFR ceilings are prevailing at KCEC. Low MVFR to IFR conditions are expected at ACV and CEC overnight but possibly earlier with occasional LIFR ceilings. Elsewhere, VFR conditions will prevail across the interior with gusty northerly winds until the evening.

MARINE. SCA conditions will continue across the southern outer waters where a band of northerly winds of 15 to 25 kt and steep seas of 7 feet at 7 seconds persists. Some reduction may occur Friday as the steep seas are modeled to drop below 6 feet, and winds of 21 kts will become mostly focused in areas on the lee side of Cape Mendocino. By the weekend, the pattern will transition back into a more typical summertime regime with high pressure ridging building in from the west against an inverted trough to the east. In response, northerly winds and steep seas will then be on the increase again.

EKA WATCHES/WARNINGS/ADVISORIES. CA . None. NORTHWEST CALIFORNIA COASTAL WATERS . Small Craft Advisory until 9 AM PDT Friday for PZZ475.



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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 74 mi53 min 51°F1018.8 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi33 min 55°F2 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Weaverville, CA5 mi54 minWSW 9 G 1410.00 miFair73°F44°F36%1016.3 hPa

Link to 5 minute data for KO54

Wind History from O54 (wind in knots)
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Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Fri -- 12:01 AM PDT     Moonrise
Fri -- 04:19 AM PDT     6.11 feet High Tide
Fri -- 05:54 AM PDT     Sunrise
Fri -- 11:17 AM PDT     0.38 feet Low Tide
Fri -- 11:24 AM PDT     Moonset
Fri -- 06:10 PM PDT     6.02 feet High Tide
Fri -- 08:49 PM PDT     Sunset
Fri -- 11:50 PM PDT     3.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.54.255.76.165.44.43.21.90.90.40.51.32.43.74.95.765.95.34.53.73.2

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Fri -- 12:01 AM PDT     Moonrise
Fri -- 04:03 AM PDT     6.55 feet High Tide
Fri -- 05:54 AM PDT     Sunrise
Fri -- 10:35 AM PDT     0.28 feet Low Tide
Fri -- 11:24 AM PDT     Moonset
Fri -- 05:54 PM PDT     6.45 feet High Tide
Fri -- 08:49 PM PDT     Sunset
Fri -- 11:08 PM PDT     3.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.94.85.66.36.56.35.44.12.61.20.40.30.91.93.24.55.66.26.46.15.34.23.43

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

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Wind Forecast for Eureka, CA (1,6,7,8)
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Ground Weather Radar Station Medford, OR
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Disclaimer:
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.