Friday, March24, 2017 L-36.com


Marine Weather and Tides
Montara, CA

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:03AMSunset 7:27PM Friday March 24, 2017 5:01 PM PDT (00:01 UTC) Moonrise 4:07AMMoonset 3:03PM Illumination 7% Phase: Waning Crescent; Moon at 27 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 213 Pm Pdt Fri Mar 24 2017
Tonight..NW winds 10 kt. Wind waves 2 ft or less. W swell 7 to 8 ft at 10 seconds. Chance of showers in the evening, then slight chance of showers after midnight.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 8 ft at 13 seconds.
Sat night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 7 to 9 ft at 14 seconds.
Sun..S winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 6 to 7 ft at 13 seconds. Chance of showers in the morning, then showers likely in the afternoon.
Sun night..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 5 to 7 ft at 12 seconds. Showers likely.
Mon..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 8 to 10 ft. Slight chance of showers.
Tue..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 9 to 11 ft.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 6 to 8 ft with a dominant swell period of 10 seconds. Across the bar...combined seas 7 to 9 ft with a dominant swell period of 10 seconds. Maximum ebb current of 0.9 knots at 2:00 am Saturday and 1.6 knots at 01:42 pm Saturday.
PZZ500 213 Pm Pdt Fri Mar 24 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will return to northwest and continue to ease this evening in the wake of the frontal boundary that moved through the coastal waters earlier today. Southerly winds are forecast to return Sunday as the next system approaches. Fresh short period swells will make for choppy conditions over the coastal waters through the weekend.

7 Day Forecast for Marine Location Near Montara, CA
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location: 37.57, -122.58     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 242037
afdmtr
area forecast discussion
national weather service san francisco bay area
137 pm pdt Fri mar 24 2017

Synopsis Showers can be expected into the evening behind a
departing cold front. A break in the rain is expected Saturday
with showers anticipated to return starting late on Sunday as a
low pressure system moves through.

Discussion As of 1:40 pm pdt Friday... Widespread rainfall
across our CWA today as a moderate cold front quickly advances
through our region. So far rainfall reports have generally been a
bit lower than forecast in most locations which has meant fewer
hydro reports than expected. Even when the main band of moderate
rainfall went through the bay area late a couple of hours ago,
reports of roadway flooding or hydro issues were less than what we
typically would typically see. One possible reason is as expected
the front went through at an ideal time between the morning rush
and evening commute -- typically when traffic is quite a bit less.

Regardless, still decent values that will add to our impressive
totals for the winter of 2016/17.

Winds also increased as the front approached, however outside of a
few isolated spots, speeds have been lower than advisory criteria.

Latest analysis suggests that the peak winds have already
occurred, so the wind advisory was cancelled for all locations.

Post-frontal scattered showers can be expected into tonight
especially for far southern portions. However, amounts will
generally be very light -- less than 1/10" for urban locations
with locally up to 1/4" for higher elevation spots.

Dry weather will return for Saturday through most of Sunday as a
weak ridge of high pressure builds back to the coast. Highs will
mostly be in the upper 50s to mid 60s on Saturday with a few
degrees of cooling on Sunday as the ridge flattens out. At the
same time a minor system will drop down from the north and
quickly move through our region. Scattered showers can be expected
with the majority of the rain over the north bay. In fact, many
locations south of the bay area will likely see a tenth or less.

Light showers will mostly come to an end by Monday morning.

Continues to look like next Monday through the following weekend
will be fairly quiet as a ridge of high pressure builds to the
coast and is then replaced by a dry northwesterly flow. Models
show possibly two shots at getting light scattered showers,
however any associated precipitation should be very light.

Temperatures will range from near normal to a bit above normal.

Aviation As of 10:55 am pdt Friday... For 18z tafs. A heavy band
of showers is moving across the bay area at this hour resulting in
decreased vsbys and ifr to MVFR CIGS to area terminals. As the
band of rain slides south terminals currently ahead of the band
will begin to see lowered vsbys and cigs. Improving conditions
expected behind this band of showers later this afternoon and
evening.

Moderate southeasterly winds with locally stronger gusts will
continue across the forecast area. Wind gusts could reach 25-30 kt
at times through about 00z, as a cold front passes.

Moderately high confidence.

Vicinity of ksfo... MVFR CIGS with periods of moderate rain and
gusty winds expected through 00z. Moderate southeasterly winds
with gusts around 25 kt or more expected through the afternoon
and early evening.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals...VFR CIGS prevail at this hour with cigs
expected to lower to MVFR around 20z with the arrival of the rain.

Southeast winds will turn increasingly to the south by the
afternoon, with gusts around 20 kt possible.

Marine As of 10:49 am pdt Friday... Occasional gale force gusts
are possible through the day today as a storm system impacts the
region with strong southerly winds and rain. Seas will be rough
with the frontal passage... But should begin to decrease by this
evening. Expect northwest winds to return by Saturday morning
before briefly becoming southerly on Sunday as another weak
system moves over the waters.

Mtr watches/warnings/advisories
Tngt Sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 9 pm
sca... Sf bay until 5 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 5 pm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
sca... Pt reyes to pigeon pt 0-10 nm until 3 pm
public forecast: bell
aviation: cw
marine: cw
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi62 min 56°F10 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi44 min WSW 4.1 G 7
PXSC1 19 mi44 min 56°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi72 min WNW 5.8 G 7.8 53°F 55°F9 ft1021.4 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 20 mi44 min SE 12 G 15 55°F 59°F1021.6 hPa
RTYC1 - 9414523 - Redwood City, CA 20 mi44 min S 4.1 G 5.1 55°F 59°F1020.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi44 min ESE 7 G 12
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 21 mi72 min SSW 3.9 G 3.9 55°F 55°F10 ft1020.9 hPa (-0.4)
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi50 min ESE 5.1 G 8 55°F 1021.4 hPa
OBXC1 21 mi50 min 56°F
LNDC1 22 mi50 min ESE 4.1 G 7 56°F 1021.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi44 min SE 7 G 9.9 56°F 1021.5 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi44 min SE 2.9 G 7
PRYC1 - 9415020 - Point Reyes, CA 36 mi44 min SSW 1.9 G 5.1 56°F 56°F1020.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi44 min SSW 8 G 9.9 56°F 1020.8 hPa
UPBC1 40 mi44 min SSW 7 G 11
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi44 min S 5.1 G 8.9 57°F 58°F1021.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi44 min S 8.9 G 11 56°F 58°F1021.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi44 min SSE 9.9 G 12 56°F 1021.1 hPa

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Last
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SW10
G14
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S3
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SE2
G5
SE3
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G12
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G13
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G14
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1 day
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W9
G16
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G19
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W6
G12
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G6
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S8
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G22
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G11
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G13
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G17
W11
G19
W11
G22
W10
G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi67 minSSE 68.00 miOvercast55°F53°F94%1021.7 hPa
San Francisco, San Francisco International Airport, CA12 mi66 minE 810.00 miOvercast56°F53°F90%1021.2 hPa
San Carlos Airport, CA18 mi2.2 hrsSSE 62.00 miLight Rain Fog/Mist54°F53°F100%1021.7 hPa
Oakland, Metro Oakland International Airport, CA21 mi69 minSSE 132.50 miLight Rain Fog/Mist56°F55°F97%1021.7 hPa

Wind History from HAF (wind in knots)
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Last 24hrW7SW4S5S6SE7SE6SE7SE7SE6S9SE9S10
G17
SE9SE12SE11SE15S18
G28
S21
G25
S16
G26
S20
G29
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G34
S6
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S6SE7
1 day agoNW13NW14
G19
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G19
NW13
G16
NW12NW16
G22
N14
G20
NW14
G23
NW15
G23
NW14NW13NW11NW10
G15
NW10NW9
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NW6NW10NW6NW6NW5SW4SW6SW5W8
2 days agoS14S14
G17
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S13S11
G20
S14
G18
S12
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S12
G19
S9
G15
E4CalmNW3NW5W5N5NW7NW9N10NW11NW10NW12NW12NW13
G19
NW14

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Fri -- 02:46 AM PDT     2.30 feet Low Tide
Fri -- 05:06 AM PDT     Moonrise
Fri -- 07:06 AM PDT     Sunrise
Fri -- 08:25 AM PDT     5.04 feet High Tide
Fri -- 03:08 PM PDT     0.12 feet Low Tide
Fri -- 04:02 PM PDT     Moonset
Fri -- 07:25 PM PDT     Sunset
Fri -- 09:50 PM PDT     4.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.32.82.42.32.63.23.94.6554.43.52.31.20.40.10.30.91.82.93.84.54.64.4

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 01:07 AM PDT     -1.00 knots Max Ebb
Fri -- 04:20 AM PDT     0.00 knots Slack
Fri -- 05:06 AM PDT     Moonrise
Fri -- 07:07 AM PDT     Sunrise
Fri -- 07:08 AM PDT     1.04 knots Max Flood
Fri -- 10:22 AM PDT     -0.00 knots Slack
Fri -- 01:18 PM PDT     -1.65 knots Max Ebb
Fri -- 04:02 PM PDT     Moonset
Fri -- 04:51 PM PDT     0.00 knots Slack
Fri -- 07:26 PM PDT     Sunset
Fri -- 07:54 PM PDT     1.41 knots Max Flood
Fri -- 11:25 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-1-0.9-0.6-0.20.40.8110.70.2-0.5-1.3-1.6-1.6-1.2-0.70.10.81.31.41.30.90.3

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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 numerious 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.