Sunday, April5, 2020
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Marine Weather and Tides
Atwater, 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 6:39AMSunset 7:30PM Sunday April 5, 2020 12:20 PM PDT (19:20 UTC) Moonrise 3:52PMMoonset 4:34AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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- 837 Am Pdt Sun Apr 5 2020
.small craft advisory in effect until 5 pm pdt this afternoon...
Today..SW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 3 to 4 ft at 10 seconds. Showers.
Tonight..W winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 10 seconds. Showers likely.
Mon..S winds 5 to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 9 seconds. A chance of showers.
Mon night..NW winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 9 seconds. A slight chance of showers.
Tue..NW winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 9 seconds.
Tue night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 9 seconds and S around 2 ft at 18 seconds.
Wed..W winds up to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft and S around 2 ft.
Thu..SW winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 837 Am Pdt Sun Apr 5 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to heavy showers will persist today along with a slight chance of Thunderstorms due to a cold upper low moving in from the gulf of alaska. This will also result in breezy west to southwest winds across portions of the coastal waters. The low will slowly exit the area into Tuesday before high pressure rebuilds over the eastern pacific mid to late next week. A prevailing moderate northwesterly swell will persist through much of the forecast period.


7 Day Forecast for Marine Location Near Atwater, CA
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location: 37.35, -120.61     debug


Area Discussion for - San Joaquin Valley/Hanford, CA
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FXUS66 KHNX 051703 AAA AFDHNX

Area Forecast Discussion . UPDATED National Weather Service Hanford CA 1003 AM PDT Sun Apr 5 2020

UPDATE. Issued a wind advisory for the west side of the SJV and coastal hills until 8pm PDT.

UPDATE DISCUSSION. HRRR guidance is ramping up south to southwest winds along the west side as the cold front pushes through today. Gusty winds up to 50 mph is possible in the coastal hills and gusts up to 40 mph are possible along the Interstate 5 corridor until 8 pm PDT.

PREV DISCUSSION. /issued 427 AM PDT Sun Apr 5 2020/

SYNOPSIS . A strong late season storm system will bring heavy rain and snowfall to the region through Monday afternoon. Additional precipitation is possible into the southern half of the district late Tuesday into Wednesday. Conditions will dry out and warm up by the end of the week.

DISCUSSION . Current surface analysis showing a cold front slowly moving into the Bay Area with a band of moderate to locally heavy precipitation moving into the northern San Joaquin Valley/northern Sierra. Radar imagery is also picking up some isolated rain and snow showers in the central Sierra, mostly from Fresno County northward toward the Yosemite area.

For today, much advertised upper level low currently positioned at 42N/130W will continue to slowly progress southward along the CA coast. The aforementioned cold front will also slowly progress southward through the CWA, bringing moderate rain to the northern half of the valley in the morning, and eventually into Kern County by the afternoon/evening. Afternoon convection is expected ahead and along this surface front. Weak instability (MUCAPES roughly 250 to 500 J/kg) will allow for some locally heavier rainfall rates of up to 0.50 in/hr. Due to the slow movement of the front, strong flux of moisture and enhanced upslope forcing, we have nudged precipitation totals upward to WPC guidance. The aforementioned heavy rainfall rates may lead to flash flooding concerns in the foothills later this afternoon into the evening in the Sierra foothills, mainly north of Tulare County.

Snowfall will continue to intensify into the evening in the Sierra above 5,000 feet, where a Winter Storm Warning will go into effect at 8AM through 5 PM Monday. Snowfall totals of 3 to 4 feet is expected above 7,000 feet, and 1 to 2 feet between 5,000 to 7,000 feet. Snow levels in the Sierra will start off around 6,000 feet before lowering to around 4,000 feet by Monday morning. Moving into the southern half of the CWA, snowfall will intensify later this evening into the Kern County mountains where a Winter Storm Warning will go into effect at 5 PM today until 11 PM Monday. Up to a foot of snow is possible is possible above 6,000 feet. Snow levels may drop to as low as pass level on Tuesday morning, but a majority of the precipitation across the CWA will be over at that point.

The upper level low will continue to slowly drift southward along the CA coast into Wednesday. As this low moves into Socal, moisture will wrap around from the south/southwest. Deterministic model solutions begin to slightly diverge at this point as the NAM12 and ECMWF keep the upper level low off the CA coast through Wednesday, eventually moving into Socal/Baja Wednesday afternoon. However, the GFS is a faster solution, moving the low into socal overnight Tuesday, early Wednesday. Confidence is growing in measureable precipitation mostly into Kern and Tulare Counties on Tuesday into late Wednesday. But, given the different model solutions, I will hold off on any additional winter weather products this time.

As the upper level low finally exits the region by Thursday, a ridge will build into the eastern Pacific from Thursday into the end of the forecast period next Sunday. Conditions will dry out and temperatures will return back to average by Thursday/Friday to above average by next weekend.

AVIATION . For the southern San Joaquin valley and Sierra foothills: MVFR conditions with local IFR ceilings and visibilities likely by the afternoon. Additionally, moderate to locally heavy rain showers and isolated thunderstorms will intensify throughout the day, eventually ending by Monday afternoon.

Over the Sierra Nevada and Kern County mountains: expect IFR due to precipitation and mountain obscurations through at least Monday evening.

AIR QUALITY ISSUES . None.

CERTAINTY .

The level of certainty for days 1 and 2 is high. The level of certainty for days 3 through 7 is medium.

Certainty levels include low . medium . and high. Please visit www.weather.gov/hnx/certainty.html for additional information an/or to provide feedback.

HNX WATCHES/WARNINGS/ADVISORIES. Winter Storm Warning until 5 PM PDT Monday for CAZ192>194.

Wind Advisory until 8 PM PDT this evening for CAZ179-180-182.

Winter Storm Warning from 5 PM this afternoon to 11 PM PDT Monday for CAZ195>197.



update . jdb public . cmc aviation . JEB

weather.gov/hanford


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 70 mi96 min S 8.9 55°F 1024 hPa52°F
MLSC1 - Moss Landing, South Harbor, CA 73 mi54 min S 14 G 36 55°F 1006.8 hPa47°F

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Merced / Castle Air Force Base, CA3 mi96 minSSE 12 G 227.00 miLight Rain55°F55°F100%1006.4 hPa
Merced Regional Airport, CA6 mi28 minSSE 19 G 2810.00 miOvercast and Breezy58°F48°F72%1006.5 hPa

Link to 5 minute data for KMER

Wind History from MER (wind in knots)
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Last 24hrCalmCalm--Calm--------SW6W3CalmCalmNW3CalmSE3S4SE4SE4SE7Calm----SE15SE12
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1 day agoCalm--Calm----------N5N3NW6NW5N3--Calm--CalmCalmCalmCalm--Calm----
2 days agoNW15
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----------------N4N5CalmCalm--CalmCalmCalmCalmW5CalmCalmN7N9--

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Sun -- 01:10 AM PDT     -0.14 feet Low Tide
Sun -- 05:37 AM PDT     Moonset
Sun -- 06:44 AM PDT     Sunrise
Sun -- 07:22 AM PDT     3.30 feet High Tide
Sun -- 01:11 PM PDT     0.74 feet Low Tide
Sun -- 04:54 PM PDT     Moonrise
Sun -- 06:47 PM PDT     3.67 feet High Tide
Sun -- 07:33 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0.100.61.42.22.93.33.22.82.11.510.70.91.42.333.53.73.42.81.91.1

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Sun -- 01:47 AM PDT     0.01 knots Slack
Sun -- 04:46 AM PDT     0.67 knots Max Flood
Sun -- 05:37 AM PDT     Moonset
Sun -- 06:43 AM PDT     Sunrise
Sun -- 07:25 AM PDT     -0.00 knots Slack
Sun -- 10:46 AM PDT     -0.79 knots Max Ebb
Sun -- 01:47 PM PDT     0.00 knots Slack
Sun -- 04:21 PM PDT     0.68 knots Max Flood
Sun -- 04:54 PM PDT     Moonrise
Sun -- 06:48 PM PDT     -0.00 knots Slack
Sun -- 07:32 PM PDT     Sunset
Sun -- 10:34 PM PDT     -1.18 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.40.10.40.60.70.50.2-0.2-0.5-0.7-0.8-0.7-0.30.10.50.70.60.4-0.1-0.6-1-1.2-1.2

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Joaquin Valley/Hanford, CA (15,3,4,5)
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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.