Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Roseland, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:53AMSunset 8:21PM Sunday May 20, 2018 6:01 PM PDT (01:01 UTC) Moonrise 10:15AMMoonset 12:00AM Illumination 36% 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
    EDIT      (on/off)   Help
PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 241 Pm Pdt Sun May 20 2018
.small craft advisory in effect through late Monday night...
Tonight..NW winds 25 to 30 kt...becoming 20 to 30 kt after midnight. Wind waves 6 to 9 ft...subsiding to 4 to 7 ft after midnight. W swell 3 to 4 ft at 11 seconds.
Mon..NW winds 20 to 25 kt with gusts up to 35 kt. Wind waves 5 to 8 ft. W swell 3 to 4 ft at 11 seconds.
Mon night..NW winds 15 to 25 kt with gusts up to 35 kt. Wind waves 4 to 7 ft. NW swell 4 to 5 ft at 10 seconds and sw around 3 ft at 21 seconds.
Tue..NW winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell around 5 ft at 10 seconds and sw around 3 ft at 20 seconds.
Tue night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. Mixed swell nw 4 to 5 ft at 10 seconds and sw around 3 ft at 19 seconds.
Wed..SW winds 5 to 10 kt. Wind waves 2 ft or less. Mixed swell nw 4 to 5 ft and sw 3 to 4 ft.
Wed night..W winds up to 10 kt. Wind waves 2 ft or less. Mixed swell nw around 4 ft and sw 3 to 4 ft.
Thu..S winds around 5 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 5 ft and S 3 to 4 ft.
Fri..S winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft and sw around 3 ft.
PZZ500 241 Pm Pdt Sun May 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to strong northwesterly winds will persist over the coastal waters through Monday in response to a tight north to south pressure gradient along the coast. These winds will result in steep wind waves as well and produce hazardous conditions for small crafts. A long period southerly swell will increase and mix with northwesterly swell by Monday morning, gradually increasing through much of the week.

7 Day Forecast for Marine Location Near Roseland, CA
   Hourly   EDIT   Help
location: 38.43, -122.71     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 202348
afdmtr
area forecast discussion
national weather service san francisco bay area
448 pm pdt Sun may 20 2018

Synopsis Upper low over california will keep temperatures below
normal at least through Tuesday. Weak ridge builds around midweek
with temperatures near normal before another trough approaches
Friday through Sunday with onshore winds keeping temperatures on
the cool side of normal while mainly dry conditions are forecast.

Discussion As of 1:42 pm pdt Sunday... Below normal
temperatures and breezy onshore winds continue to be the main
forecast trend. So far this afternoon temps generally running from
the upper 50s beaches, 60s around the bay and 70s well inland.

Cloud decks are around 2500 feet deep along the coast due to an
upper low over the region. The ben lomond raws up in the santa
cruz mountains is sitting in the cloud layer and so far reporting
a high of only 49 degrees so far this afternoon. Onshore gradient
of 2.5 mb from sfo to sac is pushing some gusty winds from the
golden gate out into the delta with sfo gusting to 33 mph last
hour.

Looking forward the last few NAM runs have generated some coastal
drizzle tonight with cyclonic flow aloft and moist onshore flow
lifting the boundary layer. Coastal hills from san mateo southward
to monterey that are exposed to NW winds off the ocean is where
the modeling is showing some measurable drizzle type QPF that
should it develop will be localized.

Main forecast theme to start the work week will be continued below
normal temps and breezy onshore winds. The north bay may see the
most sunshine on Monday with drier north northeast flow around
the upper low. MOS data showing 79 degrees for santa rosa on
Monday while most cities around the bay will see 60s once again
with some lower 70s for the santa clara valley.

The upper low slowly ejects inland by Tuesday but a deep marine
layer and onshore flow will likely remain in its wake with
continued trend of below normal temps and onshore breezes.

Some weak ridging or zonal type flow develops weds afternoon into
Thursday sending temps back to near normal.

Longwave trough approaches by Friday afternoon with onshore winds
and approaching upper low sending inland temps back below normal
once again for Saturday and Sunday of the upcoming memorial day
weekend. Latest ECMWF does indicate system may be progressive
with warmer high pressure by memorial day Monday but that scenario
may be dubious with developing tropical system in the gulf of
mexico potentially slowing the large scale west to east flow
across the us.

Aviation As of 4:48 pm pdt Sunday... It'sVFR with a few areas
MVFR ceilings mainly on the coast this afternoon. Low clouds will
generally fill in again tonight and Monday morning. Mid to high
clouds with a 500 mb closed low will slowly move eastward this
evening into Monday.

Vicinity of ksfo... MVFR ceiling tonight into Monday morning, westerly
wind gusting to 30 knots this evening. Gusty westerly wind resumes
Monday afternoon and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ceilings tonight into Monday morning.

Partial clearing possible either by late Monday morning or early
afternoon.

Marine As of 01:17 pm pdt Sunday... A strong north to south
pressure gradient along the california coast will maintain
moderate to strong northwesterly winds over the coastal waters
through Monday. As a result, steep wind waves will produce
hazardous conditions for small crafts. A long period southerly
swell will increase and mix with northwesterly swell by Monday
morning, gradually increasing through much of the week.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rww
aviation: canepa
marine: rgass
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
PRYC1 - 9415020 - Point Reyes, CA 33 mi43 min WNW 23 G 32 54°F1013.4 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 34 mi51 min NW 27 G 37 54°F 1013.8 hPa50°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 35 mi43 min W 18 G 21 60°F 1011.7 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi49 min NW 8.9 G 14 60°F 61°F1012.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi76 min W 13 65°F 1011 hPa50°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi74 min S 2.9 61°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 41 mi43 min W 5.1 G 12 62°F 1013.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi43 min SSW 14 G 19 64°F1012 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi43 min SW 8.9 G 15 64°F 65°F1011.6 hPa
46237 - San Francisco Bar, CA (142) 45 mi61 min 55°F5 ft
FTPC1 - 9414290 - San Francisco, CA 45 mi49 min WSW 9.9 G 18 55°F 57°F1013.5 hPa
PXSC1 46 mi49 min 56°F 50°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 47 mi43 min W 13 G 22 56°F 1012.1 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi43 min W 18 G 26 56°F 1012.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi51 min WNW 16 G 23 53°F 51°F1015 hPa51°F
OBXC1 47 mi43 min 56°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 48 mi43 min W 22 G 26
LNDC1 49 mi43 min WSW 14 G 17 56°F 1013.3 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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
4
PM
5
PM
Last
24hr
W20
G25
W20
W21
G28
W23
W23
G29
W22
G27
W16
G21
W17
G22
NW18
G23
W19
G26
NW19
NW21
G29
NW22
G28
W20
G27
W19
G24
NW19
G25
W21
G26
W18
G24
NW18
G23
W23
G29
NW24
G31
NW22
G31
W21
G26
W23
G31
1 day
ago
W16
G21
W24
G30
W23
G29
W24
G29
W21
W16
G20
W17
G23
NW19
G24
NW19
G26
NW19
G24
NW21
NW21
G26
NW18
G24
NW17
G23
NW15
G21
NW18
G22
W20
G25
NW19
G25
NW20
G27
W23
G28
NW23
G30
W22
G30
W20
G27
W19
G24
2 days
ago
NW21
NW19
G24
W14
G18
W11
W12
G17
W13
G17
W12
G15
W13
G17
NW17
NW14
G18
W11
G15
NW10
G15
NW14
G18
NW11
NW11
G16
NW15
NW16
NW15
W14
G20
NW17
NW16
G21
NW15
W14
G21
W17
G22

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA8 mi68 minSSE 810.00 miFair74°F51°F45%1009.7 hPa
Petaluma Municipal Airport, CA13 mi66 minW 9 G 1810.00 miFair63°F50°F64%1012.2 hPa
Novato / Gnoss Field, CA21 mi66 minSW 15 G 2310.00 miFair64°F48°F56%1011.8 hPa

Wind History from STS (wind in knots)
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
4
PM
5
PM
6
PM
Last 24hrSE11SE5N5NW3S4SE5S4S3S3SW4SE3CalmS3S33Calm3SE5S7S8SE9
G16
SW8S8SE6
1 day agoS10SE6SE4SE3S3S3SW3CalmCalmCalmCalmCalmCalmS4SW355Calm5SE9SE12SE12SE13SE14
2 days agoSE14SE11SE6SE6S3S4S3CalmCalmE3CalmCalmCalmCalmS3CalmS43CalmS10
G15
S12S12SE12SE12

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Upper drawbridge
Click for Map
Sun -- 12:36 AM PDT     2.20 feet Low Tide
Sun -- 12:49 AM PDT     Moonset
Sun -- 05:41 AM PDT     6.46 feet High Tide
Sun -- 05:55 AM PDT     Sunrise
Sun -- 11:15 AM PDT     Moonrise
Sun -- 01:20 PM PDT     -0.80 feet Low Tide
Sun -- 08:06 PM PDT     5.65 feet High Tide
Sun -- 08:19 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.32.32.945.36.26.4653.72.10.7-0.3-0.8-0.60.21.42.84.25.25.65.44.73.8

Tide / Current Tables for Lakeville, Petaluma River, San Pablo Bay, California
   EDIT      (on/off)   Help   One Week of Data
Lakeville
Click for Map
Sun -- 12:27 AM PDT     2.19 feet Low Tide
Sun -- 12:49 AM PDT     Moonset
Sun -- 05:29 AM PDT     6.24 feet High Tide
Sun -- 05:55 AM PDT     Sunrise
Sun -- 11:15 AM PDT     Moonrise
Sun -- 01:11 PM PDT     -0.78 feet Low Tide
Sun -- 07:55 PM PDT     5.45 feet High Tide
Sun -- 08:18 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.22.334.15.36.16.25.74.73.31.80.5-0.4-0.8-0.50.31.52.94.25.25.55.14.43.6

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
      (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.