Friday, March24, 2017 L-36.com


Marine Weather and Tides
Larkspur, 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 2:59 PM PDT (21:59 UTC) Moonrise 4:07AMMoonset 3:02PM Illumination 8% 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 213 Pm Pdt Fri Mar 24 2017
Tonight..W winds 10 kt. Chance of showers in the evening, then slight chance of showers after midnight.
Sat..NW winds 10 kt...becoming southwest in the afternoon.
Sat night..W winds 5 to 15 kt.
Sun..SW winds 5 to 15 kt. Chance of showers.
Sun night..SW winds 5 to 15 kt. Showers likely.
Mon..NW winds 10 to 20 kt. Slight chance of showers.
Tue..W winds 5 to 15 kt.
Wed..W winds 10 kt.
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 Larkspur, CA
   Hourly   EDIT   Help
location: 37.94, -122.53     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 241812
afdmtr
area forecast discussion
national weather service san francisco bay area
1112 am pdt Fri mar 24 2017

Rain and gusty southerly winds return today...

Synopsis Rain and wind will spread southward today across the
forecast area as a cold front moves across the region. A break in
the rain is expected Saturday with showers anticipated to return
Sunday afternoon and night as a low pressure system moves through.

Discussion As of 8:10 am pdt Friday... Everything is still on
track for widespread rainfall (potentially moderate to heavy at
times) later today along with gusty southerly winds. Kmux radar
shows the bulk of the rain is currently from sf bay northward.

Over the past 30 minutes have noted an increase in moderate
cells moving across the waters and our cwa. Model guidance
continues to bring the main band and associated cold front through
later this morning around sf bay and down to monterey bay during
the afternoon. Latest CNRFC forecast has changed little from
yesterday, so still expecting 2/3" to 1.5" for many urban
locations around sf bay. Coastal ranges will mostly be in the 2-4"
category although a few spots in the north bay mountains could
see even higher values.

So far winds haven't been to high (typical windy spots still under
40 mph), although those values should increase shortly as the
front approaches. Gusts of 25 to 35 mph will be common in urban
locations.

Will be updating the forecast as the day unfolds, although do not
anticipate any major changes.

Previous discussion The approaching system is taking its time
reaching us, but kmux radar is starting to fill in with stronger
reflectivities off the coast. So far, only a couple hundredths of
an inch have been picked up by rain gauges in the north bay.

Latest model runs indicate a slightly slower solution with the
main rain band intensifying over the north bay after sunrise, then
spreading south through the remainder of the bay area during the
morning. The hrrr keeps the monterey peninsula rain-free until
early afternoon. Satellite-estimated precipitable water values
still exceed 180-200% of normal offshore, with over 1.5" of pw in
the moisture plume aimed currently aimed at the northern
california coast. Thus, once this system moves through, episodes
of locally heavy rain are possible, especially over coastal hills.

Rainfall totals through Saturday morning are forecast to range
from 1-3" in the north bay and coastal hills and from 0.25-0.75"
in the lower elevations. Rain to turn to showers this afternoon
and end overnight.

In addition to rain, southerly winds are expected to ramp up in
advance of and with the front. Winds will be strongest over the
higher terrain from santa cruz county northward, as well as some
coastal areas. A wind advisory will be issued for these areas for
much of today. Downed limbs, trees and power lines seem likely.

Precip will turn showery by Friday night and end in the pre-dawn
hours of Saturday. Saturday looks dry but seasonably cool.

Another system will bring rain chances back to the area late
Sunday. This system does not look to be as wet, but an additional
0.25-0.50" with local amounts 0.75 inches possible. This rain is
expected to be east of the area by midday Monday.

Beyond that the remainder of next week now looks dry.

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
Tday Wind advisory... North bay mountains from 6 am this
morning to 3 pm pdt this afternoon.

Sca... Mry bay
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Sf bay
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 pm
public forecast: bell/sims
aviation/marine: cw
visit us at

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
RCMC1 - 9414863 - Richmond, CA 6 mi41 min SSW 4.1 G 8.9 55°F 57°F1021.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi41 min S 16 G 21 55°F 1021.7 hPa
FTPC1 - 9414290 - San Francisco, CA 10 mi41 min SW 5.1 G 8 55°F 56°F1021.9 hPa
46237 - San Francisco Bar, CA (142) 12 mi59 min 56°F11 ft
PXSC1 12 mi41 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi41 min SSE 14 G 17
OBXC1 14 mi41 min 54°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi47 min SSE 13 G 17 54°F 1021.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi41 min SSW 8 G 12 55°F 1021.1 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi41 min SE 15 G 18 53°F 59°F1022.1 hPa
LNDC1 17 mi47 min SSE 9.9 G 14 53°F 1021.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi69 min SSW 9.7 G 12 54°F 55°F10 ft1021.6 hPa (+1.1)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi41 min S 15 G 19 55°F 58°F1021.7 hPa55°F
UPBC1 23 mi41 min SSW 8.9 G 18
PRYC1 - 9415020 - Point Reyes, CA 24 mi41 min W 5.1 G 8.9 55°F 56°F1021.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi41 min S 11 G 15 55°F 57°F1021.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 32 mi74 min SSW 12 55°F 1021 hPa53°F
RTYC1 - 9414523 - Redwood City, CA 34 mi41 min SE 7 G 12 55°F 59°F1021 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 35 mi47 min S 8.9 G 13 58°F 1021.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi69 min SSW 5.8 G 7.8 55°F 55°F11 ft1021.4 hPa (+1.3)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi29 min WNW 1.9 G 7.8 54°F 55°F1021.4 hPa51°F

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
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
Last
24hr
S8
G12
SW7
G13
W6
G14
W6
G13
SW5
G8
SW4
S5
S5
SE4
S9
SE6
G11
S10
G13
S10
G15
S11
G16
SE9
G13
SE10
G14
SE8
G14
SE9
G13
SE11
G15
S17
G24
S14
G18
SE13
G17
S14
G21
SW5
G9
1 day
ago
NW9
G16
NW10
G15
NW12
G16
NW12
G18
NW11
G15
NW11
G15
NW11
G19
NW11
G15
NW11
G15
NW10
G15
NW8
G12
NW9
NW6
G10
NW7
G11
NW5
G8
NW7
NW6
NW5
G8
NW6
NW7
G10
S6
SE3
G6
S6
G9
S8
G12
2 days
ago
S9
G14
SW10
G15
SW12
G18
SW10
G17
S11
G17
S11
G16
S10
G15
S8
G15
S9
G13
S10
G17
S8
G13
SW7
G11
S7
S5
G8
NW5
NW6
G9
NW5
NW6
G11
NW4
G8
NW10
NW2
G5
NW7
NW8
G12
NW7
G12

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA14 mi84 minSW 9 G 1610.00 miMostly Cloudy57°F53°F88%1021.3 hPa
Petaluma Municipal Airport, CA22 mi64 minW 75.00 miOvercast55°F53°F94%1021.7 hPa
Oakland, Metro Oakland International Airport, CA23 mi66 minSSE 141.50 miRain Fog/Mist55°F52°F90%1021.9 hPa
Napa, Napa County Airport, CA23 mi65 minSSW 1610.00 miOvercast58°F54°F87%1020.3 hPa
San Francisco, San Francisco International Airport, CA24 mi63 minENE 51.50 miRain Fog/Mist54°F51°F90%1021.6 hPa

Wind History from DVO (wind in knots)
4
PM
5
PM
6
PM
7
PM
8
PM
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
Last 24hrSE5SW10W15
G20
CalmCalmCalmSE4CalmCalmSE4SE3S6SE5SE10SE7SE12SE10SE6
G13
SE10S7
G12
SE7S9SW8SW13
1 day agoW10
G26
W14
G24
W12
G20
W12
G20
W12
G27
W13
G20
W11
G19
W8
G16
W10NW8
G15
W7
G14
NW6
G12
N5NE6CalmCalmCalmCalmCalmNW946
G11
SW9Calm
2 days agoSW16SW13S10S9SW8
G14
S7SW7CalmCalmW4CalmCalmCalmNW8
G13
W8
G14
W6W6
G11
W9W9NW9W5W8
G14
5
G16
W8
G16

Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Corte Madera Creek
Click for Map
Fri -- 04:27 AM PDT     2.18 feet Low Tide
Fri -- 05:06 AM PDT     Moonrise
Fri -- 07:06 AM PDT     Sunrise
Fri -- 10:08 AM PDT     5.34 feet High Tide
Fri -- 04:01 PM PDT     Moonset
Fri -- 04:49 PM PDT     0.11 feet Low Tide
Fri -- 07:26 PM PDT     Sunset
Fri -- 11:33 PM PDT     4.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.53.93.22.62.22.22.73.44.355.35.14.43.32.110.30.10.51.32.33.44.34.9

Tide / Current Tables for Point San Quentin 1.9 mi E, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Point San Quentin 1.9 mi E
Click for Map
Fri -- 12:22 AM PDT     -0.00 knots Slack
Fri -- 03:05 AM PDT     -1.50 knots Max Ebb
Fri -- 05:06 AM PDT     Moonrise
Fri -- 06:32 AM PDT     0.00 knots Slack
Fri -- 07:06 AM PDT     Sunrise
Fri -- 09:09 AM PDT     1.30 knots Max Flood
Fri -- 11:57 AM PDT     -0.00 knots Slack
Fri -- 03:16 PM PDT     -2.47 knots Max Ebb
Fri -- 04:01 PM PDT     Moonset
Fri -- 07:03 PM PDT     0.00 knots Slack
Fri -- 07:25 PM PDT     Sunset
Fri -- 09:55 PM PDT     1.76 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.6-1.3-1.5-1.4-1-0.40.311.31.20.7-0-1.1-2-2.5-2.3-1.8-1.1-0.10.91.61.81.5

Weather Map and Satellite Images
       (on/off)   Help
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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Sacramento, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.