Friday, March24, 2017 L-36.com


Marine Weather and Tides
La Honda, 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 7:02AMSunset 7:26PM Friday March 24, 2017 3:02 PM PDT (22:02 UTC) Moonrise 4:05AMMoonset 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
PZZ560 Pigeon Point To Point Pinos To 10 Nm- 213 Pm Pdt Fri Mar 24 2017
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 15 to 25 kt...becoming northwest 10 kt after midnight. Wind waves 3 to 5 ft. 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 10 to 20 kt. Wind waves 2 to 4 ft. W swell 8 to 9 ft at 14 seconds.
Sun..SW winds 10 kt. Wind waves 2 ft or less. W swell 6 to 8 ft at 13 seconds. Slight chance of showers in the morning, then chance of showers in the afternoon.
Sun night..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 5 to 6 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 5 to 15 kt. Wind waves 1 to 3 ft. W swell 9 to 12 ft.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft.
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 La Honda, CA
   Hourly   EDIT   Help
location: 37.3, -122.29     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
RTYC1 - 9414523 - Redwood City, CA 15 mi45 min SE 7 G 12 55°F 59°F1021 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 32 mi73 min SSW 5.8 G 7.8 55°F 55°F11 ft1021.4 hPa (+1.3)
AAMC1 - 9414750 - Alameda, CA 33 mi45 min SE 15 G 18 53°F 59°F1022.1 hPa
LNDC1 34 mi51 min SSE 9.9 G 14 53°F 1021.7 hPa
OBXC1 35 mi45 min 54°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi45 min SSE 14 G 17
PXSC1 35 mi45 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 35 mi51 min SSE 13 G 17 54°F 1021.7 hPa
FTPC1 - 9414290 - San Francisco, CA 36 mi45 min SW 5.1 G 8 55°F 56°F1021.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 36 mi73 min 21 G 27 56°F 56°F12 ft1021.7 hPa (+0.3)
46237 - San Francisco Bar, CA (142) 38 mi63 min 56°F11 ft
46114 - West Monterey Bay, CA 40 mi63 min 56°F10 ft
46092 - MBM1 40 mi54 min SE 18 56°F 56°F1021.5 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi45 min S 16 G 21 55°F 1021.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi73 min SSW 9.7 G 12 54°F 55°F10 ft1021.6 hPa (+1.1)
RCMC1 - 9414863 - Richmond, CA 44 mi45 min SSW 4.1 G 8.9 55°F 57°F1021.4 hPa

Wind History for Redwood City, 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
N9
NW10
G13
W15
W10
G16
W4
G7
W2
S3
S3
SE4
SE4
G8
SE4
G8
SE4
G8
S2
E4
G7
SE4
SE5
G9
SE6
G10
SE4
G7
S6
G9
S7
G10
SE8
G12
SE10
G16
SE9
G17
SE8
G11
1 day
ago
W14
G18
W14
G19
W14
G17
W14
G19
W13
G16
W10
G13
W10
W7
W10
G13
W10
G15
W14
G17
W11
G15
W8
W5
G10
W4
W5
SW4
S1
W8
W6
G9
NW3
W6
W5
G9
W7
G11
2 days
ago
SW10
G15
S10
G16
S8
G14
S9
G13
S9
G13
S7
G11
S5
G10
S4
G8
SE6
G11
S5
G8
SE6
G9
S7
G10
SE1
G4
E4
NE4
SE2
S3
W5
W8
NW8
G11
W11
G14
W9
G13
NW13
W13
G16

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA15 mi76 minESE 186.00 miRain and Breezy55°F53°F94%1021.3 hPa
Mountain View, Moffett Field, CA16 mi67 minSSE 75.00 miLight Rain Fog/Mist56°F52°F87%1022.3 hPa
San Carlos Airport, CA16 mi76 minESE 72.00 miRain Fog/Mist54°F51°F94%1021.7 hPa
Half Moon Bay Airport, CA18 mi68 minS 14 G 241.00 miFog/Mist55°F53°F94%1022 hPa
San Jose, San Jose International Airport, CA20 mi70 minESE 1410.00 miOvercast55°F46°F74%1022 hPa
San Francisco, San Francisco International Airport, CA22 mi67 minENE 51.50 miRain Fog/Mist54°F51°F90%1021.6 hPa

Wind History from PAO (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 24hrN12N15SW12SW7SW6SW6------------------SE12SE12SE12--SE15
G22
SE16
G22
--SE18SE12
1 day agoNW15NW12W17W17W15W10------------------444NW5Calm--N10N10N11
2 days agoSW12SW15
G23
SW10SW10S10S6------------------S5CalmW8W10NW10NW9NW12NW13NW13

Tide / Current Tables for Ano Nuevo Island, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Ano Nuevo Island
Click for Map
Fri -- 02:32 AM PDT     2.18 feet Low Tide
Fri -- 05:04 AM PDT     Moonrise
Fri -- 07:06 AM PDT     Sunrise
Fri -- 08:06 AM PDT     4.64 feet High Tide
Fri -- 02:54 PM PDT     0.01 feet Low Tide
Fri -- 04:02 PM PDT     Moonset
Fri -- 07:25 PM PDT     Sunset
Fri -- 09:32 PM PDT     4.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.52.22.22.63.13.84.44.64.53.92.91.80.80.200.311.92.83.74.24.23.8

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Bridge
Click for Map
Fri -- 12:27 AM PDT     -0.00 knots Slack
Fri -- 02:37 AM PDT     -0.75 knots Max Ebb
Fri -- 05:04 AM PDT     Moonrise
Fri -- 05:27 AM PDT     0.00 knots Slack
Fri -- 07:05 AM PDT     Sunrise
Fri -- 08:33 AM PDT     1.36 knots Max Flood
Fri -- 11:56 AM PDT     -0.00 knots Slack
Fri -- 02:44 PM PDT     -1.40 knots Max Ebb
Fri -- 04:00 PM PDT     Moonset
Fri -- 06:06 PM PDT     0.00 knots Slack
Fri -- 07:24 PM PDT     Sunset
Fri -- 09:19 PM PDT     1.72 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.3-0.7-0.7-0.6-0.20.30.91.31.31.10.6-0-0.8-1.3-1.4-1.2-0.7-0.10.71.41.71.71.3

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 (18,4,5,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, 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.