Friday, August18, 2017 L-36.com


Marine Weather and Tides
Cupertino, 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 6:26AMSunset 7:56PM Friday August 18, 2017 11:18 AM PDT (18:18 UTC) Moonrise 2:04AMMoonset 4:41PM Illumination 13% Phase: Waning Crescent; Moon at 26 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- 827 Am Pdt Fri Aug 18 2017
Today..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 4 to 5 ft at 12 seconds and S 3 ft at 16 seconds. Patchy fog late in the morning.
Tonight..SW winds 10 kt. Wind waves 3 ft in the evening... Becoming 2 ft or less. Mixed swell nw 4 to 5 ft at 11 seconds and S 3 ft at 16 seconds. Patchy fog after midnight.
Sat..SW winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 4 ft at 11 seconds and S 3 ft at 15 seconds. Patchy fog in the morning.
Sat night..SW winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 4 ft at 11 seconds and S 3 ft at 15 seconds.
Sun..SW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 4 to 6 ft at 11 seconds.
Mon..S winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft.
PZZ500 827 Am Pdt Fri Aug 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect increasing northwesterly winds to continue through the weekend as high pressure builds over the eastern pacific. Locally steep wind waves will also accompany the increasing winds.

7 Day Forecast for Marine Location Near Cupertino, CA
   Hourly   EDIT   Help
location: 37.31, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 181729
afdmtr
area forecast discussion
national weather service san francisco bay area
1029 am pdt Fri aug 18 2017

Synopsis Look for one more day of minor warming today as a
ridge of high pressure continues to build into our region. Minor
cooling can be expected over the weekend into next week as an
upper level low and shortwave trough move into our region.

Overnight clouds can be expected especially along the coast.

Discussion As of 08:02 am pdt Friday... Only a few minor
adjustments made to this morning's forecast as the low clouds
have managed to progress inland. Livermore, for example, recently
transitioned from clear skies to overcast conditions. Additionally,
low clouds managed to make it to san francisco international
airport with bkn ovc conditions reported over the past hour. Do
expect clearing by mid late morning for most locations today with
mostly clear skies for the afternoon. With a building ridge just
offshore, this morning's 12z oakland sounding shows increasing 500
mb heights compared to 24 hours ago. At 850 mb, temps have warmed
by about 3 deg c. As a result, this will translate to several
degrees of warming at the surface this afternoon for most interior
areas. High temperatures will be generally in the 60s and 70s
along the coast and 80s and 90s for inland communities.

For additional forecast details, please refer to the previous
discussion section.

Prev discussion As of 3:00 am pdt Friday... For the first time in
quite awhile, satellite shows that clouds are fairly limited
across our region with even monterey bay cloud-free at this hour.

Satellite does show clouds finally advancing toward the coast and
with a westerly gradient nearly 3 mb, we should see them at least
advance to the coast before sunrise. Synoptically a ridge of high
pressure will move across our region today which will lead to a
few degrees of warming. Temperatures will be in the 60s and 70s at
the coast with 80s and 90s inland.

The ridge will be replaced by an upper level low and a shortwave
trough that will dive down from the north. This will lead to
cooling over the weekend and next week with most spots dropping 5
to 10 degrees. Clouds will also be likely each night especially
near the coast. Big question will be how much the marine layer
will change with the low overhead. Could be a case of the marine
layer mixing out. Regardless, next week is shaping up to be very
quiet with temperatures near normal.

Aviation As of 10:30 am pdt Friday... For 18z tafs. Stratus has
begun to burn off retreat back to the coast across most TAF sites.

ExpectingVFR conditions through the afternoon before the return
of low CIGS late tonight early tomorrow morning. Some uncertainty
in the extend of stratus coverage for tomorrow morning.

Vicinity of ksfo...VFR currently with westerly winds increasing
this afternoon to around 15 kt. Expecting stratus to return late
tonight with slightly lower CIGS than what we saw today.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... CIGS have retreated for ksns bringingVFR
conditions. Expecting return of low CIGS this evening. Stratus
still hovering around the edge of kmry. Possible the stratus will
clear out this afternoon although confidence is low, may bounce
betweenVFR and MVFR before the deck returns tonight.

Marine As of 08:27 am pdt Friday... Expect increasing
northwesterly winds to continue through the weekend as high
pressure builds over the eastern pacific. Locally steep wind waves
will also accompany the increasing winds.

Mtr watches warnings advisories
Tday None.

Public forecast: rowe bell
aviation: as
marine: as
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 16 mi48 min NNW 1.9 G 5.1 65°F 72°F1015.6 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi48 min SE 1 G 2.9 63°F 67°F1016.8 hPa
LNDC1 36 mi48 min WSW 1.9 G 4.1 62°F 1016.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi48 min WNW 1.9 G 2.9
OBXC1 37 mi48 min 62°F 59°F
PXSC1 38 mi48 min 61°F 59°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi48 min NNW 7 G 8 60°F 1015.4 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi48 min W 2.9 G 4.1 62°F 1016.4 hPa
ELXC1 - Elkhorn Slough Reserve, CA 38 mi93 min Calm 60°F 1016 hPa59°F
46092 - MBM1 39 mi76 min W 1.9 59°F 57°F1016.8 hPa (+0.5)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 40 mi88 min Calm G 1.9 60°F 60°F5 ft1016.9 hPa (+0.8)
FTPC1 - 9414290 - San Francisco, CA 40 mi48 min WNW 5.1 G 8 59°F 62°F1016.8 hPa
46114 - West Monterey Bay, CA 43 mi48 min 60°F6 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi48 min SW 7 G 8 62°F 1016.7 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi88 min W 1.9 G 3.9 60°F 62°F6 ft1016.3 hPa (+0.6)
46237 - San Francisco Bar, CA (142) 45 mi48 min 60°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 45 mi61 min ESE 5.1 59°F 1017 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi48 min S 5.1 G 8.9 60°F 65°F1016.3 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi57 min 57°F2 ft

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
11
AM
12
PM
1
PM
2
PM
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
Last
24hr
NW4
N9
N9
N10
G14
N12
NW17
N13
G16
NW12
NW9
G12
N7
N6
N6
W2
NW4
N5
NW5
NW5
NW4
NW4
NW4
N1
N4
NE2
E2
1 day
ago
E5
G8
NE4
G7
N5
G10
N8
G11
N10
G14
NW10
NW8
G11
N11
G15
NW9
NW8
NW7
W5
SW4
S4
S5
SE3
G6
S2
W5
NW3
SE2
E2
G5
E3
NW2
N3
2 days
ago
W9
G12
W11
G15
W16
W14
G17
W15
W17
G23
W13
G19
W10
W9
W7
G11
NW6
W4
W5
W5
SW4
--
SE1
S1
S2
S2
S2
SE1
SE4
E4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA8 mi82 minN 010.00 miPartly Cloudy69°F59°F70%1016.7 hPa
San Jose, San Jose International Airport, CA8 mi25 minN 07.00 miFair72°F59°F64%1015.4 hPa
Palo Alto Airport, CA12 mi31 minNNE 610.00 miClear68°F60°F78%1015.9 hPa
San Jose / Reid / Hillv, CA13 mi31 minN 010.00 miClear77°F59°F54%1016.3 hPa
San Carlos Airport, CA18 mi31 minVar 47.00 miA Few Clouds with Haze66°F59°F78%1016.3 hPa
Hayward, Hayward Air Terminal, CA24 mi24 minVar 310.00 miFair68°F55°F63%1016.7 hPa

Wind History from NUQ (wind in knots)
12
PM
1
PM
2
PM
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
Last 24hrN7N9N10N10N10N11NW9NW10NW7N5N7N6N6N8N6NE4NE5N5CalmN3N3CalmCalm3
1 day ago4N9N8N10N13N10N11N11NW8N9N8NE6NE3CalmCalmCalmCalmSE3SE4SE4E3CalmNW3N5
2 days agoNW8N12N12NW9
G16
W9W11
G17
N13
G20
N11N12N8N8NE9NE6CalmE3CalmCalmSE4SE3CalmSE7SE5SE64

Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Upper Guadalupe Slough
Click for Map
Fri -- 03:04 AM PDT     Moonrise
Fri -- 05:35 AM PDT     -0.38 feet Low Tide
Fri -- 06:26 AM PDT     Sunrise
Fri -- 11:45 AM PDT     8.03 feet High Tide
Fri -- 05:22 PM PDT     2.81 feet Low Tide
Fri -- 05:41 PM PDT     Moonset
Fri -- 07:55 PM PDT     Sunset
Fri -- 10:39 PM PDT     11.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.76.64.32.20.6-0.3-0.30.72.34.36.37.787.46.24.73.52.93.14.66.89.110.711

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Point 2.3 mi NE
Click for Map
Fri -- 02:37 AM PDT     -1.40 knots Max Ebb
Fri -- 03:04 AM PDT     Moonrise
Fri -- 05:31 AM PDT     0.00 knots Slack
Fri -- 06:27 AM PDT     Sunrise
Fri -- 08:23 AM PDT     1.46 knots Max Flood
Fri -- 11:36 AM PDT     -0.00 knots Slack
Fri -- 03:20 PM PDT     -0.68 knots Max Ebb
Fri -- 05:25 PM PDT     0.01 knots Slack
Fri -- 05:41 PM PDT     Moonset
Fri -- 07:56 PM PDT     Sunset
Fri -- 08:01 PM PDT     1.16 knots Max Flood
Fri -- 10:54 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-1.2-1.4-1.4-1-0.40.41.11.41.41.10.5-0.1-0.4-0.6-0.7-0.6-0.30.40.91.210.6-0

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 (14,3,4,5)
      (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.