Thursday, August13, 2020
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Marine Weather and Tides
Las Lomas, 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 6:21AMSunset 8:01PM Thursday August 13, 2020 8:03 PM PDT (03:03 UTC) Moonrise 12:06AMMoonset 2:48PM Illumination 23% Phase: Waning Crescent; Moon at 25 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- 201 Pm Pdt Thu Aug 13 2020
Rest of today..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 13 seconds. A slight chance of showers and Thunderstorms.
Tonight..SW winds 5 to 15 kt. Wind waves 1 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 13 seconds. A slight chance of showers and Thunderstorms.
Fri..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft at 9 seconds.
Fri night..S winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 8 seconds.
Sat..W winds 5 to 15 kt. Wind waves 1 ft. W swell 2 to 3 ft at 9 seconds and sw around 2 ft at 18 seconds.
Sat night..NW winds up to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft at 9 seconds and sw around 2 ft at 18 seconds.
Sun..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft and sw around 2 ft.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft and sw around 2 ft. Winds and wind waves higher in and near Thunderstorms. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 201 Pm Pdt Thu Aug 13 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Remnant tropical moisture from former hurricane elida will continue to bring chances of Thunderstorms to the southern waters into this evening. Locally gusty winds, rough seas, and frequent lightning with some of these cells will be possible. Otherwise, generally light to moderate northwest winds across the waters through the weekend aside from locally breezy winds over the northern outer waters into this evening. Mixed seas will persist through the period with a short period northwest swell and two longer period southerly swells.


7 Day Forecast for Marine Location Near Las Lomas, CA
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location: 36.86, -121.76     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 140132 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 632 PM PDT Thu Aug 13 2020

SYNOPSIS. A warming trend will continue through late week as high pressure builds toward the coast. Some tropical moisture arriving from the south will bring a chance for a few showers and thunderstorms Thursday and Friday. By Friday and moreso over the weekend hot weather returns to inland areas with triple digit heat likely continuing into early next week while a shallow marine layer persists along the coast.

UPDATE as of 6 pm Thursday. Added zones 528-529 to Heat Advisory for Friday (Santa Cruz, Hollister, Salinas and Carmel Valley). Updated NPW has been sent. RWW

DISCUSSION. as of 1:52 PM PDT Thursday . Storms fired up this morning across our southern waters and slowly moved to the northeast, becoming more enhanced by the slug of moisture from the remnants of tropical storm Elida that has been moving up along the California coast. The 12Z NAM-12km run from today captured some of the morning elevated convection off the coasts of Santa Barbara and SLO Counties but failed to capture the larger cluster of elevated convection that developed over the southern waters of our CWA this morning as well. This larger cluster weakened significantly by 19Z and its outflow has ignited some new storms due west of it while the elevated convection closer to SLO county came ashore late this morning. Similar elevated convection is expected to move into far southern Monterey County this afternoon as well. High cirrus associated with both clusters has engulfed most of the southern CWA and made it into parts of the Bay Area. Our 18Z sounding was able to capture some of the weak instability at the mid-levels along with some of the 300-250hPa cirrus.

Depending on how quickly the moisture moves into the central and northern CWA today and through early Friday afternoon, could see more storms training off the coast through the period and potentially making their way ashore, with the highest confidence still being for convection to trail over southern Monterey County. PWATs remain over >1 inch across the CWA as the tropical moisture treks northward. Air mass near the surface is still dry. Thankfully the majority of the lightning that has been detected since dawn has been offshore. Moreover, as more moisture moves overhead we can expect for any storms that move ashore later tonight and into tomorrow morning to be wet thunderstorms. In the meantime, continue to monitor lightning as the elevated convection continue coming ashore. Expecting the majority of this tropical moisture to depart our CWA by Saturday.

Outside of the convection, marine layer compression has continued through the day as the weak offshore low is cast aside by the expanding upper-level ridge over the Southwestern US. The Nam12km runs continue to keep us slightly warmer than the GFS20km runs, but regardless we are expecting warm coastal conditions along the coast and hot conditions across the interior. In the coming days, 590dm heights are progged to move into our area. Both the 12Z GFS- 20km and NAM-12km runs from today have increased their confidence for 850hPa temps over 25 deg C across the CWA by Friday afternoon as the ridge builds to a 596dm. Unlike what has happened for the most part this summer, the offshore mid-level low will not be the dominating synoptic pattern for the weekend. Coastal locations will likely make it into the low 80s through the weekend while interior locations will easily climb the mid-90s F, with up to 108 F in some of our warmest locations like Lake Berryesa and Pinnacles. Also not expecting much in the way of temperature recoveries this weekend, with overnight mins staying rather mild all across the CWA. As the ridge builds through the weekend and into the first half of next week, the 00Z GFS ensembles move the center of the ridge closer to the Utah/Nevada border, while the 00Z ECMWF run from today takes a more aggressive approach and builds it to 601dm over central Nevada and moves 569dm-598dm heights into our CWA Monday evening. Will keep a close eye on the latest model runs in order to assess how long the heat wave will persist across the CWA, but at the moment it's looking like aside from some minor cooling during the middle of next week, this will be a prolonged event.

In the meantime, excessive heat warning is now in effect across the entire from Friday into Wednesday while a heat advisory has been issued only for targeted regions of the North Bay valleys, SF shoreline, and the Santa Cruz Mountains.

AVIATION. as of 6:32 PM PDT Thursday . for 00z TAFs. High clouds over the Central Coast spreading over the Bay Area. So far all showers and isolated t-storms remain offshore or to the south of terminals. The tropical surge has disrupted the marine layer and not expecting low cigs tonight except possibly around kmry/ksns overnight.

Vicinity of KSFO . VFR with high clouds overnight into Friday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Expecting mainly high clouds this evening and overnight with marine layer wiped out.

MARINE. as of 3:00 PM PDT Thursday . Remnant tropical moisture from former Hurricane Elida will continue to bring chances of thunderstorms to the southern waters into this evening. Locally gusty winds, rough seas, and frequent lightning with some of these cells will be possible. Otherwise, generally light to moderate northwest winds across the waters through the weekend aside from locally breezy winds over the northern outer waters into this evening. Mixed seas will persist through the period with a short period northwest swell and two longer period southerly swells.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm until 3 AM



PUBLIC FORECAST: DRP AVIATION: RWW MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 3 mi79 min WSW 2.9 65°F 60°F
MLSC1 - Moss Landing, South Harbor, CA 4 mi33 min SSW 1 G 4.1 62°F 1012.6 hPa58°F
46092 - MBM1 16 mi45 min WNW 3.9 60°F 60°F1012.5 hPa (-1.7)
46240 - Cabrillo Point, Monterey Bay, CA (158) 18 mi68 min 61°F2 ft
MEYC1 19 mi88 min NNW 8 G 8.9 62°F 65°F1013.5 hPa
46114 - West Monterey Bay, CA 33 mi38 min 61°F5 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 34 mi34 min NNW 7.8 G 9.7 60°F 61°F1012.9 hPa58°F
46239 - Point Sur, CA (157) 40 mi38 min 59°F5 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA6 mi71 minS 810.00 miFair0°F0°F%1012.9 hPa
Salinas, Salinas Municipal Airport, CA16 mi71 minNW 88.00 miFair70°F55°F61%1013.2 hPa
Monterey Regional Airport, CA19 mi70 minN 07.00 miFair68°F57°F70%1014.7 hPa
Hollister, CA, CA19 mi69 minW 610.00 miFair81°F50°F34%1012.9 hPa

Link to 5 minute data for KWVI

Wind History from WVI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW4SW3SW53S5SW10
G21
SW94W5S8Calm
1 day agoCalmCalmCalmCalmS3CalmS3S3E4CalmS3CalmCalmCalmSW6SW7SW6SW6SW7SW9SW7SW7W5SW3
2 days agoW4SW3CalmCalmNW5SW3W5W5CalmCalmCalmCalmNW3SW445SW7W8W10W11W8W9W9W4

Tide / Current Tables for Elkhorn Slough railroad bridge, California
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Elkhorn Slough railroad bridge
Click for Map
Thu -- 01:05 AM PDT     Moonrise
Thu -- 01:22 AM PDT     0.96 feet Low Tide
Thu -- 06:22 AM PDT     Sunrise
Thu -- 08:43 AM PDT     3.55 feet High Tide
Thu -- 12:42 PM PDT     2.95 feet Low Tide
Thu -- 03:48 PM PDT     Moonset
Thu -- 06:58 PM PDT     5.22 feet High Tide
Thu -- 07:59 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.3111.31.82.32.83.23.53.53.43.2333.13.54.14.65.15.254.43.52.4

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Thu -- 01:07 AM PDT     Moonrise
Thu -- 03:14 AM PDT     0.00 knots Slack
Thu -- 06:15 AM PDT     0.41 knots Max Flood
Thu -- 06:24 AM PDT     Sunrise
Thu -- 09:26 AM PDT     -0.00 knots Slack
Thu -- 11:21 AM PDT     -0.25 knots Max Ebb
Thu -- 02:46 PM PDT     0.00 knots Slack
Thu -- 03:48 PM PDT     Moonset
Thu -- 05:38 PM PDT     0.33 knots Max Flood
Thu -- 08:00 PM PDT     Sunset
Thu -- 08:29 PM PDT     -0.00 knots Slack
Thu -- 11:47 PM PDT     -0.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-0.4-0.3-0.10.20.30.40.40.30.1-0.1-0.2-0.2-0.2-0.100.20.30.30.20.1-0.1-0.4-0.6

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 (23,6,7,8)
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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.