Monday, July13, 2020
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Marine Weather and Tides
Twin Lakes, 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 5:58AMSunset 8:29PM Monday July 13, 2020 2:45 PM PDT (21:45 UTC) Moonrise 12:06AMMoonset 1:07PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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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PZZ535 Monterey Bay- 232 Pm Pdt Mon Jul 13 2020
Tonight..W winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 9 seconds. Patchy fog after midnight. Patchy drizzle after midnight.
Tue..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 9 seconds. Patchy fog. Patchy drizzle.
Tue night..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 9 seconds.
Wed..SW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft at 9 seconds.
Wed night..SW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 10 seconds.
Thu..SW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 11 seconds.
Thu night..SW winds around 5 kt. Wind waves 1 ft. W swell 2 to 4 ft at 10 seconds.
Fri..SW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft.
Sat..SW winds up to 10 kt. Wind waves 1 ft. NW swell 2 to 4 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 232 Pm Pdt Mon Jul 13 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northwest winds will persist over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. Additionally, winds will be strong from the golden gate through the delta. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.


7 Day Forecast for Marine Location Near Twin Lakes CDP, CA
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location: 36.83, -122.01     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 131731 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1031 AM PDT Mon Jul 13 2020

SYNOPSIS. Interior areas are forecast to cool through midweek as onshore flow increases and high pressure weakens. Temperatures will then likely remain near seasonal averages for the remainder of the week and into next weekend. Expect increasing night and morning low clouds through midweek.

DISCUSSION. as of 09:13 AM PDT Monday . Marine layer is back up to around 1500ft this morning on the Fort Ord Temperature Profiler as boundary layer conditions return to what is expected for early- to- mid July.

The marine layer is back in full swing thanks to the weakening upper-level ridge, which has trekked eastward into the Texas Panhandle. Low-clouds and fog are widespread along the coast, with stratus inclusion dominating the Golden Gate and northwestern Alameda county. Drizzle has also been observed in several coastal locations including Monterey Bay. Other interesting features this morning include the stratus layer that's snaked its way into the Salinas Valley, and an eddy to the south of our CWA and just off the coast of San Luis Obispo.

Min temps across the interior were observed in the upper 50s to low 60s F range with higher- elevation areas like those up in the East Hills just barely making it into the low 60s F. This a sharp contrast from the 70s F that were observed on Saturday and Sunday Morning.

Troughing over the Western Canadian Prairies and the Pacific Northwest has reintroduced onshore flow that is typical for this time of the year. Expect cooling trend across the interior, where max temps will be 7 to 12 degrees F lower than yesterday's. As we head into Tuesday and Wednesday, off-shore cyclonic flow will increase, resulting in southerly flow near the surface which will allow for more cooling to occur along the coast. Due to this setup we should also expect the marine layer to continue to build and for lower morning ceilings as the workweek progresses.

Another disturbance is set to develop off the Gulf of Alaska and make its way down the Alexander Archipelago, with its axis expected to be over Vancouver Island sometime Thursday morning/afternoon. In essence, this week's setup will be quite the opposite of what we experienced last week, with seasonable temperatures and conditions expected over the entire CWA through Friday. Nevertheless, there does appear to be a chance for some onshore show to occur through the weekend, which could lead to a slight uptick in temps across the interior.

AVIATION. as of 10:25 AM PDT Monday . for 18z TAFs. Morning low clouds continue to dissipate. VFR at most terminals with the hold outs being MRY and SNS with a few low lingering clouds. Expect VFR this afternoon at all terminals. Marine layer is forecast to return again tonight:farther inland and slightly deeper.

Vicinity of KSFO . VFR expected through early tonight. Breezy to occasionally NW winds will impact the terminal through late this afternoon. Not strong enough for Aubert Weather Warning, but gusts 25-30kt possible. Lower conf on clouds tonight, but given how close they were this morning and the forecast for a deeper marine layer, decided to bring clouds in late tonight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Lingering IFR conditions will continue to diminish for SNS and lastly MRY. VFR expected this afternoon with breezy onshore flow. Low CIGS return late this afternoon/early evening with some patchy fog.

MARINE. as of 10:20 AM PDT Monday . High pressure to the north and low pressure inland will result in gusty northwest winds over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM SCA . SF Bay SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: Diaz/DP AVIATION: MM MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46092 - MBM1 6 mi87 min WSW 5.8 56°F 55°F1014.6 hPa (-0.0)
ELXC1 - Elkhorn Slough Reserve, CA 14 mi61 min WSW 5.1 60°F 55°F
46114 - West Monterey Bay, CA 20 mi50 min 54°F8 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 21 mi26 min WNW 7.8 G 9.7 56°F 55°F1014.7 hPa54°F
46239 - Point Sur, CA (157) 34 mi50 min 54°F8 ft
RTYC1 - 9414523 - Redwood City, CA 48 mi76 min 75°F

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA14 mi53 minWSW 710.00 miOvercast64°F55°F73%1014.3 hPa
Monterey Regional Airport, CA19 mi52 minWSW 129.00 miMostly Cloudy66°F54°F65%1015.8 hPa
Salinas, Salinas Municipal Airport, CA24 mi53 minNNW 138.00 miFair67°F53°F61%1014.8 hPa

Link to 5 minute data for KWVI

Wind History from WVI (wind in knots)
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Last 24hrS9S7S8S7S6S6SE6SE5SE4E4NE3CalmCalmCalmCalmCalmSE4E4S5SE5SE54SW7SW7
1 day agoS7S9S7S7S7SE6S5S3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm4S7S76SW7
2 days agoS8S8S9S8S8S5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3SE33S5S8S8S9

Tide / Current Tables for Santa Cruz, Monterey Bay, California (sub)
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Mon -- 01:06 AM PDT     Moonrise
Mon -- 02:04 AM PDT     0.00 knots Slack
Mon -- 04:38 AM PDT     0.31 knots Max Flood
Mon -- 06:00 AM PDT     Sunrise
Mon -- 07:32 AM PDT     -0.00 knots Slack
Mon -- 09:58 AM PDT     -0.39 knots Max Ebb
Mon -- 01:41 PM PDT     0.00 knots Slack
Mon -- 02:07 PM PDT     Moonset
Mon -- 04:41 PM PDT     0.41 knots Max Flood
Mon -- 07:49 PM PDT     -0.00 knots Slack
Mon -- 08:26 PM PDT     Sunset
Mon -- 10:42 PM PDT     -0.56 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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 San Francisco/Monterey Bay Area, CA (17,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.