Thursday, July29, 2021
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Marine Weather and Tides
Half Moon Bay, 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 6:10AMSunset 8:21PM Thursday July 29, 2021 2:58 AM PDT (09:58 UTC) Moonrise 10:52PMMoonset 10:58AM Illumination 75% Phase: Waning Gibbous; Moon at 20 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- 852 Pm Pdt Wed Jul 28 2021
Tonight..NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight.
Thu..NW winds 15 to 20 kt with gusts up to 25 kt.
Thu night..NW winds 10 to 15 kt.
Fri..NW winds 10 to 15 kt with gusts up to 25 kt.
Fri night..NW winds 10 to 15 kt.
Sat..NW winds 10 to 15 kt with gusts up to 25 kt.
Sat night..W winds 5 to 10 kt.
Sun..W winds 10 to 15 kt.
Mon..W winds 10 to 15 kt.
PZZ500 852 Pm Pdt Wed Jul 28 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwest winds over the waters through the end of the week. Stronger wind gusts can be expected through the golden gate gap into the san francisco bay Thursday afternoon and evening. These winds will generate steep wind waves that may be hazardous for smaller vessels. A moderate period southerly swell persists in the waters as northwest winds remain light generating wind waves around 7 to 9 seconds. Winds start to increase this weekend.


7 Day Forecast for Marine Location Near Half Moon Bay, CA
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location: 37.47, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 290608 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1108 PM PDT Wed Jul 28 2021

SYNOPSIS. Seasonably warm weather pattern continues inland through Friday with high pressure over the region. A shallow marine layer will persist along the coast keeping temperatures seasonably mild near the coast and bays. A modest cooling trend starts this weekend for inland areas as onshore winds strengthen and the marine layer deepens along the coast.

DISCUSSION. as of 09:34 PM PDT Wednesday . It was another day of near normal to slightly above normal temps at the coast and significantly above normal temps inland. We reached the upper 90s in East Bay sites such as Concord and Livermore, and 100+ at Pinnacles NP and Parkfield. Pretty much a repeat of yesterday. One thing to note . there was a firestart near the west entrance of Pinnacles late this afternoon. The fire, estimated at 100 acres, is burning strongly and the smoke was visible on satellite. Another unpleasant reminder of the precarious situation with our extremely dry fuels inland and at elevation.

GOES-17 night imagery is showing scattered high clouds drifting northward, along with coastal stratus moving into its typical coastal locations for this time of night. Marine inversion is sitting around 1400 ft, per the Fort Ord profiler, and slightly lower at Bodega Bay. The steady marine layer with onshore flow will ensure another night of stratus intrusion around the bays and coastal locations.

Not much change in store for tomorrow as coastal stratus burns off by mid morning and onshore winds resume. The main synoptic feature continues to be dominant high pressure over the central CONUS, keeping the interior hot and dry, and monsoonal moisture over the Sierra and Great Basin.

A cooldown begins this weekend as a deepening trough offshore moves closer to the coast, resulting in a deeper marine layer and more inland penetration of cool air. In reality, not much of a change near the coast, but significantly "cooler" inland, or a return to more seasonable temperatures. Ensembles are not indicating any major pattern changes for the beginning of August.

AVIATION. as of 11:15 PM PDT Wednesday . For the 06z TAFs Another batch of high clouds look to inhibit the moment of stratus clous tonight. Monterey Bay terminals have already gone IFR an should stay there through the night, with only a few moments of scattered clouds. OAK will also fall to IFR in the late night but the other TAF sites should remain VFR. Winds will remain mild through the night but will begin to increase into Thursday morning. Cloud cover around the SF Bay will clear much sooner than the Monterey Bay meaning OAK will return to VFR in the early to mid morning, while MRY and SNS will go VFR closer to noon. Expect a mostly clear Thursday afternoon with moderate westerly winds.

Vicinity of KSFO . VFR through the TAF period. Expect few to scattered low clouds through the night, filling in over OAK but not SFO. Winds remain mild until Thursday afternoon with peak winds from the Northwest around 19 kts. These winds look to last through that evening but back off into Thursday night.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . IFR through the night and most of Thursday morning. Winds remain weak and variable through the morning, before becoming more moderate in the afternoon. Stratus persists through Wednesday morning but looks to thin around noon, leading to VFR. Winds weaken and stratus returns in the late evening and early night leading to IFR around the Monterey Bay overnight.

MARINE. as of 11:05 PM PDT Wednesday . Light northwest winds over the waters through the end of the week. Stronger wind gusts can be expected through the Golden Gate gap into the San Francisco Bay Thursday afternoon and evening. These winds will generate steep wind waves that may be hazardous for smaller vessels. A moderate period southerly swell persists in the waters as northwest winds remain light generating wind waves around 7 to 9 seconds. Winds start to increase this weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: Lorber AVIATION: Murdock MARINE: Dhuyvetter

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi59 min NNW 5.1 G 6 61°F 1015.8 hPa (-0.7)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi39 min W 1.9 G 5.8 55°F 1015.9 hPa54°F
FTPC1 - 9414290 - San Francisco, CA 23 mi59 min SSW 4.1 G 8 56°F 62°F1015.3 hPa (-0.6)
46237 - San Francisco Bar, CA (142) 23 mi59 min 59°F3 ft
PXSC1 23 mi59 min 58°F 58°F
AAMC1 - 9414750 - Alameda, CA 23 mi59 min WNW 5.1 G 6 58°F 69°F1015.6 hPa (-0.7)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi59 min W 4.1 G 7 57°F 1014.4 hPa (-0.6)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi59 min W 4.1 G 5.1
OBXC1 24 mi59 min 58°F
LNDC1 25 mi59 min NNW 2.9 G 5.1 59°F 1015.2 hPa (-0.7)
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi59 min WNW 4.1 G 6 57°F 1015.4 hPa (-0.6)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi39 min WSW 3.9 G 5.8 59°F1015.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi48 min Calm 57°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi59 min SSW 12 G 16 59°F 1015.3 hPa (-0.5)
RCMC1 - 9414863 - Richmond, CA 32 mi59 min S 2.9 G 5.1 59°F 64°F1015.1 hPa (-0.5)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi59 min SW 14 G 16 59°F 1014.3 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi59 min WNW 13 G 15 61°F 68°F1014 hPa (-0.3)
CQUC1 43 mi40 min 67°F
46269 44 mi59 min 56°F 59°F2 ft
UPBC1 44 mi59 min WNW 12 G 15
PRYC1 - 9415020 - Point Reyes, CA 45 mi59 min 58°F1015.7 hPa (-0.9)
PCOC1 - 9415144 - Port Chicago, CA 47 mi59 min W 16 G 19 63°F 69°F1013.6 hPa (-0.3)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi39 min WNW 3.9 G 5.8 57°F 60°F1015.8 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA12 mi63 minNW 910.00 miPartly Cloudy58°F55°F90%1014.9 hPa
San Carlos Airport, CA13 mi64 minN 010.00 miFair61°F57°F88%1015.2 hPa
Oakland, Metro Oakland International Airport, CA21 mi66 minNW 610.00 miMostly Cloudy59°F56°F90%1015.2 hPa
Hayward, Hayward Air Terminal, CA23 mi65 minNW 610.00 miFair58°F55°F90%1015.7 hPa
Mountain View, Moffett Field, CA23 mi64 minNNW 510.00 miOvercast63°F59°F88%1014.9 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hr--S4--SW6SW6W7------W9--NW6--N4CalmCalmCalmCalmCalmCalmCalmCalm----
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Thu -- 02:39 AM PDT     4.50 feet High Tide
Thu -- 06:11 AM PDT     Sunrise
Thu -- 09:07 AM PDT     0.83 feet Low Tide
Thu -- 11:58 AM PDT     Moonset
Thu -- 03:51 PM PDT     5.11 feet High Tide
Thu -- 08:20 PM PDT     Sunset
Thu -- 10:14 PM PDT     2.01 feet Low Tide
Thu -- 11:52 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.444.44.54.13.52.61.71.10.811.62.53.54.34.95.14.84.33.52.82.322.1

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 12:02 AM PDT     0.00 knots Slack
Thu -- 02:32 AM PDT     1.16 knots Max Flood
Thu -- 05:44 AM PDT     -0.00 knots Slack
Thu -- 06:10 AM PDT     Sunrise
Thu -- 08:58 AM PDT     -1.32 knots Max Ebb
Thu -- 11:57 AM PDT     Moonset
Thu -- 12:14 PM PDT     0.00 knots Slack
Thu -- 03:03 PM PDT     1.42 knots Max Flood
Thu -- 06:35 PM PDT     -0.00 knots Slack
Thu -- 08:19 PM PDT     Sunset
Thu -- 09:36 PM PDT     -1.15 knots Max Ebb
Thu -- 11:51 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-00.71.11.10.90.5-0.1-0.7-1.2-1.3-1.1-0.7-0.20.61.21.41.310.4-0.2-0.8-1.1-1.1-0.9

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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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