Saturday, July4, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
Half Moon Bay, 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 5:52AMSunset 8:35PM Saturday July 4, 2020 8:10 PM PDT (03:10 UTC) Moonrise 7:34PMMoonset 4:17AM Illumination 100% Phase: Full Moon; Moon at 14 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
    EDIT      (on/off)   Help
PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 227 Pm Pdt Sat Jul 4 2020
.small craft advisory in effect through Sunday evening...
This afternoon..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 7 to 9 ft at 8 seconds and sw 2 to 3 ft at 18 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. NW swell 8 to 10 ft at 8 seconds and sw 2 to 3 ft at 18 seconds.
Sun..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 4 to 5 ft. NW swell 8 to 10 ft at 8 seconds and sw 2 to 3 ft at 16 seconds.
Sun night..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 6 to 7 ft. NW swell 8 to 10 ft at 8 seconds and sw 2 to 3 ft at 16 seconds.
Mon..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 4 to 5 ft. NW swell 8 to 10 ft at 9 seconds and sw 2 to 3 ft at 15 seconds.
Mon night..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 6 to 7 ft. NW swell 7 to 9 ft at 8 seconds and sw around 2 ft at 15 seconds.
Tue..NW winds 25 to 35 kt with gusts up to 45 kt. Wind waves 6 to 7 ft. NW swell 5 to 7 ft and sw around 2 ft.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft and S around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with dominate swell period of 7 seconds. Across the bar...seas 6 to 8 ft with dominate swell period of 8 seconds. Maximum ebb current of 1.7 kt at 04:55 pm Saturday and 3.8 kt at 04:37 am Sunday.
PZZ500 227 Pm Pdt Sat Jul 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds are strong and out of the northwest over the coastal waters this afternoon and continuing into the evening and will continue through the holiday weekend. The results of the strong winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. The long-period southerly swell prevails through the weekend as well. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS66 KMTR 050150 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 650 PM PDT Sat Jul 4 2020

SYNOPSIS. High pressure will remain over the region through the remainder of the weekend resulting warm and dry conditions. Temperatures cool and the marine layer is likely to return as onshore flow increases early next week.

DISCUSSION. as of 01:20 PM PDT Saturday . A region-wide warming trend is well underway this afternoon with temperatures currently a few to as much as 15 deg F warmer compared to 24 hours ago. Additionally, clear sky conditions prevail as the warm, dry air mass aloft has mixed well to the surface. Thus, look for widespread 80s to lower 90s for most interior locations while mid 90s are possible in the region's warmest spots. Light onshore flow near the coast will keep temperatures in the 60s to 70s there and up to the lower 80s in places such as Santa Cruz.

The ridge of high pressure over the Desert Southwest bringing this warm weather to the region will remain in place on Sunday. This should allow for mostly clear conditions overnight with just an outside chance for patchy fog near the coast and into the coastal valleys early Sunday morning. Onshore winds do increase a bit by Sunday afternoon and will keep temperatures near to slightly cooler compared to today.

Temperatures cool early next week along with a likely return of our typical summer time marine layer as an upper level trough digs into the Pacific Northwest. Medium range guidance indicates a series of short-wave disturbances rounding the base of the trough through the upcoming week. Thus, look for temperatures to reamin near to slightly below seasonal averages (especially inland) with periods of night/morning coastal clouds spreading inland into the valleys each night.

AVIATION. As of 6:50 PM PDT Saturday . For 00Z TAFs. It's VFR at all terminals. VFR is forecast at the terminals with exception of patchy fog and stratus /LIFR-IFR/ redeveloping on the immediate coastline tonight and Sunday morning. Recent guidance continues to trend toward stronger onshore wind gusts Sunday and Monday afternoon and evening. Any Sunday morning fog and/or stratus patches should mix out for VFR in the afternoon.

Vicinity of KSFO . VFR. West wind 20 gusting to 25 to 30 knots until mid evening, decreasing by late evening. Possibly stronger west wind developing Sunday afternoon and evening with gusts nearing 35 knots.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR, breezy onshore winds decreasing by mid evening. Patchy fog and stratus /LIFR-IFR/ returning tonight and Sunday morning. Sunday afternoon and early evening west winds 10 to 15 knots.

MARINE. as of 08:30 AM PDT Saturday . As surface high pressure builds over the eastern Pacific, northwest winds will increase across the coastal waters today and tonight. Moderate to strong winds will prevail across the waters through the holiday weekend. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. A long-period southerly swell train will persist through the weekend. This will cause occasional breaking waves over nearshore shoals and strong currents along the coast, especially near points and headlands.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . SF Bay until 9 PM SCA . Mry Bay until 9 PM



PUBLIC FORECAST: RGass AVIATION: Canepa MARINE: DK

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi53 min W 11 G 13 77°F 76°F1015.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi31 min NW 21 G 25 57°F 1017 hPa52°F
46237 - San Francisco Bar, CA (142) 23 mi41 min 60°F6 ft
AAMC1 - 9414750 - Alameda, CA 23 mi53 min W 6 G 8.9 69°F 71°F1015.6 hPa
PXSC1 23 mi53 min 69°F 52°F
FTPC1 - 9414290 - San Francisco, CA 23 mi53 min WSW 17 G 22 63°F 64°F1015.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi53 min SW 4.1 G 9.9 69°F 1014.3 hPa
OBXC1 24 mi53 min 68°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi53 min WSW 8 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi53 min W 2.9 G 4.1 71°F 1015.3 hPa
LNDC1 25 mi53 min WSW 6 G 8 71°F 1015.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi41 min NW 16 G 19 57°F 54°F1016.6 hPa52°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi43 min S 1.9 71°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi53 min SSW 6 G 9.9 67°F 1015.6 hPa
RCMC1 - 9414863 - Richmond, CA 32 mi53 min SSE 5.1 G 5.1 70°F 64°F1014.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi53 min SW 12 G 13 76°F 1014.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi53 min W 12 G 14 81°F 69°F1014.1 hPa
UPBC1 44 mi53 min WNW 14 G 17
PCOC1 - 9415144 - Port Chicago, CA 47 mi53 min WSW 12 G 15 81°F 71°F1013.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi31 min NNW 19 G 23 57°F 56°F1016.2 hPa53°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
8
PM
9
PM
10
PM
11
PM
12
AM
-12
PM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
Last
24hr
N5
N6
NW5
N3
NW5
NW4
NW3
SE2
--
S2
NW3
NW2
NE2
N4
N4
N6
NW7
NW11
NW14
G17
NW11
W13
W11
W12
G15
1 day
ago
W9
W8
W4
W2
SE1
G4
NW4
NW1
SW3
SW2
S2
W5
NW3
NW3
N4
N3
G6
N4
G7
NW8
G11
NW10
G14
N11
G15
N12
G15
N12
G16
W11
G15
NW14
W10
2 days
ago
NW4
W4
W5
S6
SE3
W5
W2
E1
SE4
NE2
SW3
NW1
--
W2
NW4
G7
N6
G10
N4
G10
N6
G10
NW11
G14
NW11
G14
NW11
G14
W9
W9

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi16 minWNW 95.00 miFair with Haze59°F50°F72%1016.9 hPa
San Francisco, San Francisco International Airport, CA12 mi15 minNW 1310.00 miFair67°F46°F47%1015 hPa
San Carlos Airport, CA13 mi84 minWSW 10 G 1510.00 miClear81°F41°F24%1015.2 hPa
Palo Alto Airport, CA19 mi4.2 hrsNNW 1210.00 miClear81°F55°F42%1015.6 hPa
Oakland, Metro Oakland International Airport, CA21 mi18 minW 1210.00 miFair71°F52°F51%1015.5 hPa
Hayward, Hayward Air Terminal, CA23 mi17 minW 710.00 miFair71°F53°F53%1016.2 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last 24hrNW11NW9NW9NW9NW9NW9W7W6W8NW8NW7NW54N5NE6N6NW12NW18W17NW21
G24
NW20NW19W19
G23
NW13
1 day agoCalmNW4NW3W4SW4W4W44W4S5S3CalmCalmNW9N11NW13NW16NW17NW18NW20NW18NW16NW12NW10
2 days agoNW7NW5NW6S8S10S8S6S5S5S6S9S8SE3NE5NE6N10NE74SW10SW10
G17
W10SW8S7S7

Tide / Current Tables for Half Moon Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Half Moon Bay
Click for Map
Sat -- 04:52 AM PDT     -1.34 feet Low Tide
Sat -- 05:16 AM PDT     Moonset
Sat -- 05:54 AM PDT     Sunrise
Sat -- 11:54 AM PDT     4.51 feet High Tide
Sat -- 04:31 PM PDT     2.79 feet Low Tide
Sat -- 08:33 PM PDT     Moonrise
Sat -- 08:34 PM PDT     Sunset
Sat -- 09:44 PM PDT     Full Moon
Sat -- 10:25 PM PDT     6.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
4.73.11.3-0.2-1.1-1.3-1-0.112.33.44.34.54.33.73.22.82.83.34.155.86.46.3

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
San Mateo Bridge
Click for Map
Sat -- 12:39 AM PDT     -0.01 knots Slack
Sat -- 04:24 AM PDT     -2.21 knots Max Ebb
Sat -- 05:15 AM PDT     Moonset
Sat -- 05:53 AM PDT     Sunrise
Sat -- 07:53 AM PDT     0.00 knots Slack
Sat -- 10:53 AM PDT     2.20 knots Max Flood
Sat -- 02:29 PM PDT     -0.01 knots Slack
Sat -- 05:06 PM PDT     -0.94 knots Max Ebb
Sat -- 07:41 PM PDT     0.00 knots Slack
Sat -- 08:32 PM PDT     Moonrise
Sat -- 08:33 PM PDT     Sunset
Sat -- 09:44 PM PDT     Full Moon
Sat -- 10:21 PM PDT     1.51 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.6-0.3-1.1-1.8-2.2-2.1-1.7-0.90.11.322.221.40.5-0.3-0.8-0.9-0.8-0.40.311.51.4

Weather Map
       (on/off)   Help Weather Map
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 Francisco/Monterey Bay Area, CA (23,6,7,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
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.