Sunday, July25, 2021
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Marine Weather and Tides
Union City, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:05AMSunset 8:23PM Sunday July 25, 2021 9:58 AM PDT (16:58 UTC) Moonrise 9:02PMMoonset 6:40AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 842 Am Pdt Sun Jul 25 2021
Today..NW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt this afternoon.
Tonight..NW winds 10 to 15 kt with gusts up to 25 kt.
Mon..NW winds 10 to 15 kt.
Mon night..NW winds 5 to 10 kt. A slight chance of showers and Thunderstorms.
Tue..NW winds 10 to 15 kt. A slight chance of showers and Thunderstorms.
Tue night..NW winds 5 to 10 kt.
Wed..W winds 10 to 15 kt.
Thu..W winds 10 to 15 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 842 Am Pdt Sun Jul 25 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate west to northwest winds will prevail across the waters through mid-week. Locally breezy winds will persist over the far northern outer waters through Monday morning. Additionally, gusty afternoon and evening winds will funnel through the golden gate gap into the san francisco bay. Monsoonal moisture will advect northward into the waters Monday into Tuesday bringing a slight chance of high based Thunderstorms to the area. Steep northwest waves continue to dominate the sea state at 7 to 9 seconds along with a light southerly swell.


7 Day Forecast for Marine Location Near Union City, CA
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location: 37.6, -122     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 251127 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 427 AM PDT Sun Jul 25 2021

SYNOPSIS. Seasonable weather conditions will persist into Sunday. Monsoon moisture rotating out of the Desert Southwest will spread some high clouds and low end potential for showers and isolated thunderstorms across the region from Monday into Tuesday. Long range trends remain seasonably warm and dry through the end of the month.

DISCUSSION. as of 03:00 AM PDT Sunday . Satellite imagery depicts a marine layer along the coast and intruding into the interior valleys so far tonight. The Bodega Bay profiler suggests a marine layer depth around 1200 feet while the Fort Ord profiler is deeper at around 1400 feet. Pressure is down slightly versus 24 hours ago and the pressure gradient field is slanted onshore again early this morning and is being realized through rather gusty winds through the Carquinez Strait and into the Delta (gusts to 32mph as of 2AM observation) as cooler, moister marine air surges inland.

Little change in the synoptic scale pattern, with an extremely broad but relatively low amplitude 588-592dm 500mb high pressure system extending from the western Pacific to the eastern Atlantic with nearly all but New England under its influence. Farther north, the jet stream remains oriented along the Canadian border through around Syracuse New York. Ensemble model clusters suggest this broad stagnant pattern will hold steady through the remainder of the month of July. Water vapor imagery paints quite a contrast in our vicinity under this stagnant ridge, with extremely dry air rotating northward along and just off the California coast in comparison to the extremely moist monsoonal air towards our southeast into the Desert Southwest.

This monsoonal air mass is forecast to rotate clockwise from the PHX-VEGAS corridor towards Southern California before lifting northwestward into our periphery from Sunday into Tuesday. NAM/WRF and multi-model ensemble datasets indicate this monsoonal surge will be anomalously wet perhaps push into the upper 97-99th percentile wettest versus climatology, with broad swaths of >1.25" PWATs and localized bullseyes of much higher values of 1.50-2.00" PWATs. The moisture is also expected to arrive in two bursts and will have different characteristics. The first batch will arrive Sunday and will be suspended higher in the atmosphere and pose less risk for the development of deeper convection due to a lack of dynamic lift and much less impressive moisture field. The second batch will stream in between Monday and into Tuesday and will feature improved dynamic lift from a trailing mid to upper level low pressure disturbance and much deeper moisture field featuring those aforementioned anomalously high PWAT values. MUCAPE values of a few hundred J/Kg are more than enough to kick off convection with either monsoonal plume, but is much more favorable with the second plume Monday afternoon to overnight, primarily over the coastal waters and the North Bay. If showers or thunderstorms develop, they may very briefly start off dry but should transition fairly quickly to become wet given the lower expected cloud bases with the second moisture plume and anomalously high PWAT values. That said, wetting rains are unlikely and if thunderstorms do develop, lightning is often displaced from the rain shaft. The very dry fuels across the interior and at higher elevation could be at risk if struck by lightning and bares close watch. The Sierra Nevada will likely see numerous lightning strikes, and with the ongoing large wildfires there, and maxed out national preparedness levels; it is important we do our parts to prevent further wildfire starts, lightning or not.

In short, no significant change to the forecast package overnight. We continue to carry a 15% chance of showers and thunderstorms for the region, primarily Monday PM into Tuesday AM. Be sure to stay up-to-date via social media and forecast discussions as we progress through the weekend as details will likely evolve.

Otherwise, warmer, drier air will settle into the region in the wake of the monsoonal push Wed-Thu as the broad stagnant ridge expands farther offshore and is expected to push temperatures up to 5 to 12 degrees above normal. Meanwhile, alongshore locations will remain dominated by the marine environment with seasonable conditions.

AVIATION. as of 04:26 AM PDT Sunday . For the 12z TAFs. The marine layer remains at about 1,500 to 1,800 ft AGL per the Fort Ord Profiler. Satellite imagery shows an extensive stratus deck out over the waters with low clouds now settled inland down the valleys and around the San Francisco Bay. MVFR/IFR (locally LIFR) cigs for coastal sites through mid to late morning around 16z-18z. Patchy fog possible across the North Bay into early this morning. VFR conditions this afternoon before low clouds return in the evening. Expect increasing mid to high level clouds throughout the rest of the weekend and into early next week as monsoonal moisture arrives. Light winds this morning, onshore winds this afternoon 10-15 kt with locally higher gusts possible.

Vicinity of KSFO . Satellite shows stratus has filled into the Bay and moved into the terminal with cigs around 1,000 to 1,200 ft AGL. MVFR (possibly IFR) cigs through about 15z-17z before VFR conditions are expected the rest of the afternoon. Low clouds may return late tonight, though confidence is low. W/NW winds this afternoon around 15 kt. Increasing mid/high clouds tonight.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . IFR/LIFR conditions to through mid to late morning with clearing expected ~17z-19z. VFR conditions in the afternoon before low clouds return late this afternoon or early this evening. W/NW winds in the afternoon 10-15 kt.

MARINE. as of 02:07 AM PDT Sunday . Generally light to locally moderate west to northwest winds will prevail across the waters through mid-week. Locally breezy winds will persist over the far northern outer waters through Monday morning. Additionally, gusty afternoon and evening winds will funnel through the Golden Gate gap into the San Francisco Bay. Monsoonal moisture will advect northward into the waters Monday into Tuesday bringing a slight chance of high based thunderstorms to the area. Steep northwest waves continue to dominate the sea state at 7 to 9 seconds along with a light southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm until 9 AM SCA . SF Bay from 3 PM



PUBLIC FORECAST: DRP AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 13 mi64 min N 1.9 G 4.1 60°F 1016.1 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi64 min W 4.1 G 7 58°F 69°F1015.8 hPa
LNDC1 20 mi64 min W 1.9 G 6 58°F 1015.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi64 min W 6 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi64 min W 5.1 G 8 57°F 1015.5 hPa
OBXC1 23 mi64 min 57°F
PXSC1 25 mi64 min 58°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 25 mi64 min SSE 1 G 4.1 57°F 1014.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi64 min SW 12 G 16 57°F 1015.7 hPa
FTPC1 - 9414290 - San Francisco, CA 29 mi64 min WSW 6 G 12 55°F 62°F1015.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 31 mi77 min Calm 55°F 1015 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 31 mi64 min NW 17 G 23 63°F 1012.7 hPa
UPBC1 31 mi64 min WNW 17 G 20
MZXC1 - 9415102 - Martinez-Amorco CA 31 mi64 min W 13 G 16 58°F 67°F1014.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 32 mi64 min W 21 G 26 59°F 68°F1014.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi64 min WSW 8.9 G 13 57°F 1014.9 hPa
CQUC1 34 mi75 min 67°F
46237 - San Francisco Bar, CA (142) 36 mi58 min 60°F3 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi73 min W 13 62°F 1014 hPa54°F
46269 46 mi58 min 55°F 60°F2 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi38 min S 7.8 G 9.7 56°F1016.1 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA8 mi64 minNNW 310.00 miOvercast61°F55°F81%1016 hPa
Palo Alto Airport, CA10 mi71 minVar 48.00 miOvercast63°F55°F77%1015.6 hPa
Livermore, Livermore Municipal Airport, CA12 mi65 minW 610.00 miFair65°F53°F66%1013.9 hPa
Mountain View, Moffett Field, CA12 mi63 minVar 410.00 miOvercast63°F55°F77%1015.2 hPa
Oakland, Metro Oakland International Airport, CA14 mi65 minWNW 510.00 miOvercast60°F55°F84%1015.4 hPa
San Carlos Airport, CA14 mi71 minN 010.00 miOvercast61°F55°F83%1015.6 hPa
San Jose, San Jose International Airport, CA16 mi65 minN 010.00 miA Few Clouds63°F53°F70%1015 hPa
San Francisco, San Francisco International Airport, CA19 mi62 minN 010.00 miMostly Cloudy60°F53°F78%1015.2 hPa
San Jose / Reid / Hillv, CA20 mi71 minN 010.00 miClear63°F54°F73%1015.6 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hrW4W8W9W8W9W9W12W13NW10W12NW9NW8N5NW6NW7N5NW6NW7NW5N6N5NE3N6N3
1 day agoS4W4W6W8W10NW10W12NW10NW10NW9N9NW7NW5NW5NW5NW4NW5N5N6NW4N3NE4CalmCalm
2 days agoW6W8W7W11W13NW12W13W11W8NW11W10NW8NW6CalmN4N3N4NE4CalmNE3E3NE3CalmCalm

Tide / Current Tables for Coyote Hills Slough entrance, San Francisco Bay, California
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Coyote Hills Slough entrance
Click for Map
Sun -- 01:14 AM PDT     7.96 feet High Tide
Sun -- 06:07 AM PDT     Sunrise
Sun -- 07:40 AM PDT     Moonset
Sun -- 09:31 AM PDT     -0.54 feet Low Tide
Sun -- 03:16 PM PDT     6.13 feet High Tide
Sun -- 08:22 PM PDT     Sunset
Sun -- 09:30 PM PDT     1.18 feet Low Tide
Sun -- 10:02 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.77.97.87.15.94.42.71.20.1-0.5-0.40.523.85.36.165.242.81.81.21.42.7

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
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Dumbarton Hwy Bridge
Click for Map
Sun -- 02:06 AM PDT     -0.01 knots Slack
Sun -- 05:53 AM PDT     -1.68 knots Max Ebb
Sun -- 06:07 AM PDT     Sunrise
Sun -- 07:40 AM PDT     Moonset
Sun -- 09:19 AM PDT     0.00 knots Slack
Sun -- 12:35 PM PDT     2.20 knots Max Flood
Sun -- 03:44 PM PDT     -0.00 knots Slack
Sun -- 06:31 PM PDT     -0.82 knots Max Ebb
Sun -- 08:22 PM PDT     Sunset
Sun -- 09:13 PM PDT     0.00 knots Slack
Sun -- 10:02 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.510.1-0.6-1.2-1.6-1.7-1.5-1-0.30.71.62.12.21.70.8-0.1-0.6-0.8-0.8-0.5-0.10.61.2

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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