Monday, January22, 2018 L-36.com


Marine Weather and Tides
Napa, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 7:19AMSunset 5:22PM Monday January 22, 2018 11:38 AM PST (19:38 UTC) Moonrise 10:35AMMoonset 10:56PM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 830 Am Pst Mon Jan 22 2018
Today..SE winds 10 to 20 kt...becoming W 10 kt in the afternoon. Chance of showers in the morning.
Tonight..NW winds 10 kt...becoming northeast after midnight.
Tue..E winds 10 kt...becoming nw in the afternoon.
Tue night..W winds 10 kt.
Wed..S winds 10 to 20 kt...becoming w. Rain in the afternoon. Rain likely.
Thu..W winds 5 to 15 kt. Chance of showers.
Fri..NW winds 5 kt.
PZZ500 830 Am Pst Mon Jan 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... SWitch to northwesterly winds is progressing down the coast behind the cold front, now located near pigeon point. These winds will slowly diminish as the day progresses. Small craft advisories remain in place mainly due to hazardous sea conditions caused by large swells. These swells will gradually decrease through Tuesday. The next frontal system is set to arrive mid-week bringing back southerly winds and increasing northwest swell.

7 Day Forecast for Marine Location Near Napa, CA
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location: 38.3, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221830
afdmtr
area forecast discussion
national weather service san francisco bay area
1030 am pst Mon jan 22 2018

Synopsis Light rain will gradually end from north to south
through early afternoon. A dry weather break will return later
this afternoon into Tuesday. The next weather system is forecast
to bring soaking rains and locally gusty winds Wednesday and
Wednesday night with showers lingering Thursday morning. Dry
weather returns again by Friday and into next weekend.

Discussion As of 9:17 am pst Monday... Weak front is gradually
shifting southward through the south bay and towards the central
coast. Rain totals were notably higher north of the golden gate
with remnant showers now expected to only drop light rain for the
next few hours through early afternoon roughly from san jose
southward to salinas with little or no rain for southern
monterey san benito counties. Visible satellite shows rapid
clearing for the north bay already with most areas seeing skies
turn back to partly cloudy by later this afternoon.

Dry and quiet period develop tonight through Tuesday as high
pressure briefly builds.

Next front of interest should bring rain to the north bay by later
weds morning or midday. Similar to trends of late the front
appears to be weakening as it passes through the district weds
afternoon into weds evening with band of steady rain, perhaps
moderate at times. Precip will turn showery quickly behind the
front by Thursday morning as cooler air is ushered over the
region. 12z NAM suggest there will be renewed period of organized
showers Thursday afternoon as the cold core of the upper low
passes overhead.

Beyond that high pressure looks to build with dry weather forecast
Friday and through next weekend.

Prev discussion As of 5:04 am pst Monday... A cold front was slowly
moving southeastward this morning, point arena buoy indicated
frontal passage at midnight. Heavy rain and gusty winds developed
ahead of this front with isolated rain total reports 3.40" at
venado, 2.54" cazadero, and upwards of 1-2" over remaining
locations of sonoma, napa, and marin counties. From last evening
and overnight locally wind gusts peaked to near 40 mph at gualala
and monte rio, elsewhere over the bay area gusts locally reached up
to 20-30 mph.

Moisture and warm air advection prior to the cold front extended
throughout the lower levels and possibly to the mid levels at times
helping to generate a wetter frontal passage, all in all it was a
pretty good rain producer considering the mid level flow is nearly
flat, very low amplitude, and mostly devoid of positive vorticity
advection. The 12z oakland sounding shows the air saturated up to
the 700 mb level. Kmux radar reflectivities still indicate a fair
amount of showers moving west to east at this hour over the bay
area, but the trend is for showers to steadily diminish this morning
as the cold front continues to settle southward.

A dry weather break returns later today into Tuesday. Daytime
temperature recovery will be in the 50s. Night-time temperatures
will be in the 30s to mid 40s, though inland valleys may see lows
in the upper 20s due to a decrease in cloud cover tonight thus
later shifts may need to adjust min temperatures downward a little
if needed. Also, patchy valley fog becomes a little more probable
if it clears out at night.

The next upstream wet weather system is expected to arrive wed-thu,
the incoming developing rain band may be a little slower to arrive
per most recent model output forecasting a delay up to 6 hours. A
strong cold front will interact with strengthening warm air advection,
coupled with large scale dynamics greatly favoring more widespread
soaking rain. The 250 mb jet stream will dig in from the northwest
increasing cyclonic curvature over the forecast area supporting stronger
upper level divergence. The ECMWF and NAM indicate a surface trough
and cold front sweeping in from the northwest later Wednesday. The
00z WRF model run indicates surface to 850 mb winds will be mainly
southwest which would limit rain shadowing effects in the valleys and
greatly increase QPF along windward slopes. To varying degrees recent
model data (within the last month or so) is seemingly more problematic
with regard to wind, QPF forecasts, thus this system normally would
of course need to be watched closely, but as always it's the unknowns
of pacific weather systems that can catch one off-guard sometimes.

This system may be one or our wetter rain producers we've seen so
far this season. Precipitable water values will be between 0.80" and
1" with warm air advection interacting with modified polar air, orographic
forcing, and strong dynamics. After this we get a break from the rain
with upper level ridging returning for late week and the weekend.

Aviation As of 10:20 am pst Monday... For 18z tafs. Satellite
imagery and radar shows rapidly weakening frontal cloud band,
with some lingering embedded showers, now moving into the
monterey bay region. Ceilings are lifting up out of the MVFR range
from the northwest behind it, followed by clearing skies.

However, ceilings are expected to lower back to MVFR once again
tonight, along with fog development in the north bay valleys.

Light winds.

Vicinity of ksfo... Ceilings have lifted out of the MVFR range
withVFR conditions now expected to prevail the remainder of the
day and through the evening rush. Winds will generally be out of
the west and less than 15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Currently MVFR at ksns withVFR CIGS at
kmry. Still a few light showers in the area but should end
entirely by early afternoon. Expect ceilings to be close to the
MVFRVFR margin the rest of the day and into the evening, then
lower somewhat overnight.

Marine As of 08:59 am pst Monday... Switch to northwesterly
winds is progressing down the coast behind the cold front, now
located near pigeon point. These winds will slowly diminish as
the day progresses. Small craft advisories remain in place mainly
due to hazardous sea conditions caused by large swells. These
swells will gradually decrease through Tuesday. The next frontal
system is set to arrive mid-week bringing back southerly winds and
increasing northwest swell.

Mtr watches warnings advisories
Tday Sca... Mry bay until 3 pm
sca... Pt reyes to pigeon pt 0-10 nm until 3 pm
sca... Pigeon pt to pt pinos 0-10 nm until 3 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Rough bar advisory for sf bar
public forecast: rww
aviation: blier
marine: blier
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 15 mi114 min Calm 47°F 1027 hPa47°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 17 mi51 min E 9.9 G 11 50°F 1026.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi51 min NNE 7 G 8 49°F 52°F1027.5 hPa49°F
PCOC1 - 9415144 - Port Chicago, CA 21 mi51 min ENE 7 G 8.9 49°F 51°F1027.1 hPa
RCMC1 - 9414863 - Richmond, CA 27 mi51 min SE 4.1 G 6 55°F 54°F1026.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi51 min SSE 5.1 G 8 55°F 1027.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi51 min ESE 8.9 G 12 48°F 1027.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi50 min SE 7 53°F 1027 hPa (+1.0)
OBXC1 34 mi51 min 56°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi51 min SE 2.9 G 6 55°F 1027.1 hPa
PXSC1 35 mi51 min 53°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi51 min E 7 G 9.9 52°F 1025.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi51 min ESE 6 G 7
LNDC1 35 mi51 min E 2.9 G 5.1 53°F 1027.1 hPa
FTPC1 - 9414290 - San Francisco, CA 36 mi51 min W 5.1 G 8 55°F 54°F1027.2 hPa
AAMC1 - 9414750 - Alameda, CA 37 mi51 min ESE 5.1 G 7 53°F 54°F1027.2 hPa
46237 - San Francisco Bar, CA (142) 40 mi69 min 54°F8 ft
PRYC1 - 9415020 - Point Reyes, CA 42 mi51 min WNW 8 G 13 53°F1026.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 48 mi49 min NW 9.7 G 12 54°F 54°F10 ft1027.1 hPa (+1.4)

Wind History for Martinez-Amorco Pier, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Napa, Napa County Airport, CA6 mi45 minE 108.00 miFog/Mist50°F48°F93%1026.1 hPa
Petaluma Municipal Airport, CA17 mi64 minNW 410.00 miOvercast57°F50°F77%1027.1 hPa
Novato / Gnoss Field, CA18 mi44 minNW 4 G 1010.00 miOvercast57°F46°F67%1027.1 hPa
Vacaville Nut Tree Airport, CA18 mi46 minSSE 33.00 miFog/Mist48°F48°F100%1028.1 hPa
Fairfield / Travis Air Force Base, CA19 mi1.7 hrsSE 109.00 miOvercast48°F47°F99%1027.4 hPa

Wind History from APC (wind in knots)
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Last 24hrCalmCalm3S5S10S6S5SE4SE5SE6SE7S9S7S9S11S11S9S9S11S8E6E6E11E10
1 day agoCalmW4S5SW6SW6W7W6CalmS4S4E3CalmNE4CalmCalmW3CalmCalmCalmN5CalmN3CalmSE3
2 days agoSW6W6W10W12W13W10NW6W7CalmCalmN3N4NW4W3CalmW3CalmCalmCalmCalmCalmCalmCalmW4

Tide / Current Tables for Napa, Napa River, Carquinez Strait, California
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Napa
Click for Map
Mon -- 05:35 AM PST     6.62 feet High Tide
Mon -- 07:21 AM PST     Sunrise
Mon -- 10:35 AM PST     Moonrise
Mon -- 11:43 AM PST     2.45 feet Low Tide
Mon -- 04:56 PM PST     6.07 feet High Tide
Mon -- 05:20 PM PST     Sunset
Mon -- 10:56 PM PST     Moonset
Mon -- 11:45 PM PST     0.83 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.83.14.55.76.56.66.15.14.13.12.62.533.94.95.86.15.85.142.81.71

Tide / Current Tables for Mare Island Strait, So Vallejo, San Pablo Bay, California Current
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Mare Island Strait
Click for Map
Mon -- 02:06 AM PST     1.70 knots Max Flood
Mon -- 05:38 AM PST     -0.00 knots Slack
Mon -- 07:20 AM PST     Sunrise
Mon -- 07:27 AM PST     -1.46 knots Max Ebb
Mon -- 10:35 AM PST     Moonrise
Mon -- 11:21 AM PST     0.00 knots Slack
Mon -- 02:18 PM PST     1.14 knots Max Flood
Mon -- 05:04 PM PST     -0.00 knots Slack
Mon -- 05:20 PM PST     Sunset
Mon -- 07:27 PM PST     -2.06 knots Max Ebb
Mon -- 10:56 PM PST     Moonset
Mon -- 11:29 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.51.71.51.10.5-0.5-1.4-1.4-1.2-0.8-0.20.40.91.110.60-1.1-2-2-1.7-1.1-0.4

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 (14,3,4,5)
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Ground Weather Radar Station Sacramento, 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.