Saturday, February24, 2018

Marine Weather and Tides
Walnut Creek, 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 6:43AMSunset 5:58PM Saturday February 24, 2018 7:22 PM PST (03:22 UTC) Moonrise 12:29PMMoonset 2:09AM Illumination 74% Phase: Waxing Gibbous; Moon at 10 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 251 Pm Pst Sat Feb 24 2018
Tonight..NW winds 10 to 20 kt.
Sun..W winds 5 to 15 kt.
Sun night..W winds 15 to 20 kt...becoming sw 5 to 15 kt after midnight. Chance of showers after midnight.
Mon..NW winds 10 to 20 kt. Showers likely in the morning, then chance of showers in the afternoon.
Mon night..N winds 15 to 25 kt. Slight chance of showers in the evening.
Tue..N winds 15 to 25 kt...becoming nw 5 to 15 kt.
Wed..S winds 5 kt...increasing to 5 to 15 kt. Chance of rain.
Thu..SW winds 15 to 25 kt...decreasing to 5 to 15 kt. Rain, then showers likely.
PZZ500 251 Pm Pst Sat Feb 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty nw winds will continue overnight into Sunday as a dry cool front moves through and high pressure builds. Another strong cold front drops down the coast on Monday with some showers and gusty nw winds behind the front into Tuesday.

7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug

Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 242159
area forecast discussion
national weather service san francisco bay area
159 pm pst Sat feb 24 2018

Synopsis Partly cloudy skies with scattered showers across the
north bay this afternoon. Otherwise, some clearing is expected
tonight with chilly low temps. Dry weather and slightly warmer
temperatures are expected through the weekend. Cooler and
unsettled weather is expected to return by early next week with
another system bringing rain to the area later next week.

Discussion As of 01:50 pm pst Saturday... A little afternoon
excitement as a few showers popped up over the north bay.

Spotters general public reported a few showers near santa rosa,
healdsburg and windsor. For what it's worth, local WRF and hrrr
kept showers off the coast this afternoon. That definitely didn't
pan out and therefore updated forecast to better reflect reality.

Do expect this showers to gradually dissipate over the next hour
or so.

No frost or freeze headline needed for tonight. A slight increase
in cloud cover will limited cooling potential. Temps tonight are
forecast to be a few warmer than last night. That being said,
overnight lows will still be rather chilly and in the upper 20s to
mid 30s for most locations. Bay shoreline and coast in the low 40s
for lows.

Weak ridging ahead of the next storm system will allow for warmer
weather on Sunday. In fact, it could be some of the warmest temps
of the last several days with highs hitting 60 plus across the

By Sunday night the next system approaching from the north will
begin to impact the bay area. Showers will move in from N to S and
likely impact the Monday morning commute. Snow levels will
initially be greater than 3k feet, but then gradually drop through
the day. Winter precip will be possible over the higher peaks of
the forecast area, similar to earlier this week. Precip will end
from NW to SE Monday night into Tuesday. Rainfall amounts are
still generally low and mainly a few hundredths to a few tenths.

Dry weather returns briefly on Tuesday with a slight warm up, but
the next storm is waiting in the wings. For several model runs
(deterministic ensemble) now a potent low pressure has been
forecast to impact the pac NW Wednesday into Thursday. The
associated cold front is also forecast to move into norcal by
Thursday morning. The front pushes through the bay area Thursday
with post frontal showers lingering well into Friday. Not an
atmospheric river event per se, but a better moisture tap than we
have seen over the last week. Rainfall amounts could exceed an
inch across the north bay and one quarter to one half elsewhere.

Details will likely be sorted out between now and then, but
initial thinking is a wetter scenario. It should be noted that
this set up will be warmer with higher snow levels and initially
impacting only the santa lucias. The snow levels will drop behind
the front.

Lastly, the mjo has been on track to swing into phase 2 3, albeit
weak, for some time now. Climo charts for phase 2 3 indicate
wetter results for ca. The shift to phase 2 3 corresponds with feb
28 march 01 time frame, which fits the approaching front on the
medium range models.

Aviation As of 9:47 am pst Saturday for 18z tafs. Skies
currentlyVFR across the region but a weak boundary is over
mendocino county and about to bring some clouds into the north
bay. Wind boundary currently has southeast winds at koak and ksjc
while west winds have already developed at ksfo. The buoys are
strong wnw so expect ksjc and koak to begin shifting shortly.

Vicinity of ksfo... Increasing wnw winds this afternoon and
evening (gusts to around 28kt) with some MVFR CIGS possible with
increasing onshore flow as weak boundary passes the region.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions expected through mid-
morning, thenVFR MVFR for the afternoon as increasing clouds
arrive. Generally light offshore winds in the morning will become
onshore in the afternoon evening around 10-20 kt.

Here are the record low temperatures and the years they occurred for
Saturday, february 24.

Location Saturday
sf bay area
healdsburg 29 in 1944
santa rosa 28 in 1920
calistoga 29 in 1982
kentfield 29 in 1955
san rafael 34 in 2017
napa 30 in 1919
san francisco 40 in 1891
sfo airport 35 in 1955
half moon bay 33 in 2017
oakland airport 36 in 2015
richmond 36 in 1955
livermore 29 in 1987
moffett field 34 in 2017
san jose 26 in 1897
gilroy 28 in 1960
monterey bay area
santa cruz 29 in 1925
salinas 31 in 1982
salinas airport 30 in 1953
monterey 37 in 1955
king city 24 in 1982

Marine As of 9:41 am pst Saturday... A dry cold front moving
through the waters will produce breezy NW winds through tonight.

High pressure briefly builds Sunday with easing winds. Early
Monday an approaching cold front will bring a renewed chance of
strong winds, fresh swell, and showers.

Mtr watches warnings advisories
Tngt Sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 9 pm
sca... Mry bay until 9 pm
public forecast: mm
aviation: rww
marine: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi52 min W 16 G 18 52°F 52°F1025.7 hPa42°F
PCOC1 - 9415144 - Port Chicago, CA 11 mi52 min W 12 G 18 52°F 52°F1025.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi52 min WNW 11 G 19 52°F 1025.3 hPa
LNDC1 14 mi52 min NW 7 G 12 52°F 1026.1 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi52 min NW 8.9 G 15 52°F 1026.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi52 min WNW 6 G 8.9
AAMC1 - 9414750 - Alameda, CA 16 mi52 min W 11 G 13 52°F 53°F1026.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi52 min WNW 11 G 16 52°F 1025.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi52 min WNW 12 G 18 52°F 1026.2 hPa
OBXC1 17 mi52 min 52°F 41°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi52 min W 8.9 G 14 51°F 1025.3 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi52 min WNW 13 G 19 51°F 52°F1025.9 hPa
PXSC1 20 mi52 min 53°F 41°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi97 min W 9.9 53°F 1025 hPa42°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi63 min NNW 13 50°F 1026 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi52 min W 9.9 G 18 51°F 52°F1026.7 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi52 min WNW 16 G 21 51°F 52°F1027.4 hPa
46237 - San Francisco Bar, CA (142) 32 mi52 min 51°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi92 min NW 21 G 27 50°F 50°F5 ft1026.5 hPa (-1.7)

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi29 minWNW 710.00 miFair52°F39°F64%1024.7 hPa
Oakland, Metro Oakland International Airport, CA16 mi29 minWNW 1410.00 miMostly Cloudy50°F43°F77%1026.8 hPa
Hayward, Hayward Air Terminal, CA17 mi28 minWNW 1310.00 miPartly Cloudy51°F41°F69%1027.5 hPa
Livermore, Livermore Municipal Airport, CA18 mi29 minW 810.00 miFair48°F39°F74%1026 hPa

Wind History from CCR (wind in knots)
Last 24hr4CalmS4SE3S4S5SE4S6S6S4S3S4CalmCalm3SW7W7W10W11
1 day agoNW15
2 days agoW8W10SW7SW5S4S3S6S6S7S5S6SW7--W5W15

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
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Sat -- 01:31 AM PST     2.02 feet Low Tide
Sat -- 02:09 AM PST     Moonset
Sat -- 06:46 AM PST     Sunrise
Sat -- 07:38 AM PST     5.39 feet High Tide
Sat -- 12:29 PM PST     Moonrise
Sat -- 03:45 PM PST     0.37 feet Low Tide
Sat -- 05:56 PM PST     Sunset
Sat -- 10:06 PM PST     4.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Stake Point .9 Mi NNW, Suisun Bay, California Current
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Stake Point .9 Mi NNW
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Sat -- 01:29 AM PST     -0.38 knots Max Ebb
Sat -- 02:08 AM PST     Moonset
Sat -- 03:46 AM PST     0.00 knots Slack
Sat -- 06:46 AM PST     Sunrise
Sat -- 07:22 AM PST     0.93 knots Max Flood
Sat -- 10:24 AM PST     -0.00 knots Slack
Sat -- 12:29 PM PST     Moonrise
Sat -- 01:45 PM PST     -0.82 knots Max Ebb
Sat -- 05:53 PM PST     0.00 knots Slack
Sat -- 05:56 PM PST     Sunset
Sat -- 09:55 PM PST     0.63 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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 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 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.