Friday, June22, 2018 L-36.com


Marine Weather and Tides
Montara, 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 5:47AMSunset 8:36PM Friday June 22, 2018 7:33 PM PDT (02:33 UTC) Moonrise 2:35PMMoonset 1:32AM Illumination 72% 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 151 Pm Pdt Fri Jun 22 2018
.small craft advisory in effect through Saturday afternoon...
Tonight..NW winds 20 to 30 kt. Wind waves 4 to 7 ft. NW swell around 4 ft at 8 seconds.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 10 seconds.
Sat night..W winds 5 to 15 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog.
Sun..S winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft. NW swell 3 to 5 ft at 9 seconds.
Sun night..SW winds 5 to 15 kt with gusts up to 25 kt. Wind waves 3 to 5 ft. NW swell 3 to 4 ft at 9 seconds. Patchy fog.
Mon..SW winds 5 to 15 kt. Wind waves 3 to 4 ft. NW swell around 3 ft. Patchy fog.
Mon night..W winds 5 to 15 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 6 ft.
Tue..W winds 5 to 15 kt. Wind waves 3 to 4 ft. NW swell 3 to 6 ft.
Wed..W winds 5 to 15 kt. Wind waves 3 to 4 ft. NW swell 3 to 6 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a dominant period of 9 seconds. Across the bar...combined seas 5 to 7 ft with a dominant period of 9 seconds. Maximum ebb current of 3 knots at 12:49 am Saturday and 1.8 knots at 12:49 pm Saturday.
PZZ500 151 Pm Pdt Fri Jun 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong high pressure over the eastern pacific will maintain moderate to strong northerly winds across the coastal waters through late Saturday night. The strongest winds will be located over the northern outer waters. These sustained strong winds will produce relatively large and steep winds waves on top of a building northwesterly swell with moderate periods. Winds will decrease Sunday as a southerly surge moves up the coast, but remain breezy along the inner coastal waters.

7 Day Forecast for Marine Location Near Montara, CA
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location: 37.57, -122.58     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 230004
afdmtr
area forecast discussion
national weather service san francisco bay area
504 pm pdt Fri jun 22 2018

Synopsis A robust warming trend is forecast through Saturday
afternoon as high pressure builds over the region. This will lead to
hot conditions on Saturday with moderate to locally high heat risks
across mainly the interior. Additionally, offshore winds will
develop and result in heightened fire weather concerns to portions
of the region on Saturday. Cooling is then expected on Sunday with
increased onshore flow.

Discussion As of 2:37 pm pdt Friday... This morning's low
clouds were quick to mix out over the bay area and central
california coast, revealing mostly clear skies across the region
for the afternoon. Temperatures are already on the rise with most
airports running 7 to 15 degrees warmer than they were at this
time 24 hours ago. As of 2 pm pdt, livermore was reporting a temp
of 95 deg, concord was at 94, the sonoma county airport just north
of santa rosa was at 91, and 88 at san jose. A building upper
level ridge is responsible for this warming trend, and will
continue to dominate the region over the next 24-36 hours as
temperatures are forecast to climb even higher on Saturday. For
the short-term this afternoon, expect widespread 80s and 90s
across inland locations with some areas expected to break the
century mark. Hottest locations will be in the far interior east
bay, southern monterey and san benito counties, and northern napa
and sonoma counties.

Models have consistently been advertising an upper level ridge to
nose its way toward the california coast through Saturday.

Consequently we'll see temperatures continue to rise on Saturday
afternoon by another 3-8 degrees on average from today. A heat
advisory has been issued to highlight these hot conditions from 11
am to 8 pm Saturday, valid for the north bay, east bay, south
bay, and interior monterey county, and much of san benito county.

Moderate to locally high heat risks are expected for communities
in the advisory area. Residents should take the necessary
precautions to protect themselves from the heat through proper
hydration, staying indoors or in an air-conditioned building
during the hottest time of the day, and avoiding alcohol.

Locations along the immediate pacific coast will cooler with highs
ranging from the middle 60s to low 80s. If you decide to go to
the beach over the next few days, be mindful of the hazards the
water presents such as rip currents and the cold sea surface
temperatures. Also, never turn your back to the water.

In addition to the heat, offshore flow combined with the hot
conditions will bring increased fire weather concerns across the
north bay mountains and east bay hills. The fire weather watch has
been upgraded to a red flag warning starting at 11 am Saturday
through 8 pm Sunday. Minimum relative humidity values on Saturday
afternoon will drop to 10 to 20 percent in the red flag warning
area, with some local rhs dropping to the single digits. Northerly
winds will develop through the day with speeds of 15 to 30 mph
with higher gusts.

Cooler temperatures will start to arrive on Sunday, coinciding
with a southerly surge along the monterey coast. There remains
some uncertainty as to the exact timing of its arrival as it
progresses northward, but nonetheless with the ridge axis shifting
east and the eventual return of onshore flow, temperatures are
not expected to be as hot. Further cooling will continue into
early next week with more seasonable temperatures and the typical
morning low clouds expected to return.

Aviation As of 5:04 pm pdt Friday... High confidenceVFR for
the period. N-ne winds enhanced tonight into Saturday morning by
increasing acv-sfo and wmc-sfo pressure gradients. Low level wind
shear develops from napa county southward over the east bay and
into the south bay early Saturday morning, wind flow aloft ne
20-30 knots based on recent WRF model output. NAM continues with
approx 5 mb onshore bias sfo-wmc thus corrected for this we could
have 10-14 mb offshore wmc-sfo pressure gradient Saturday night
into Sunday morning.

Vicinity of ksfo...VFR, westerly wind 20-30 knots this evening til
04z before subsiding steadily mid-late evening. Surface wind likely
becoming light NE by early Saturday morning, returning to onshore
with gusts up to near 20 knots Saturday afternoon and early evening.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR, onshore winds becoming light e-se later
this evening and overnight. Onshore winds likely redeveloping by late
Saturday morning.

Fire weather As of 9:30 am pdt Friday... Fire weather watch has
been upgraded to a red flag warning for the north and east bay
hills from 11 am Saturday through 8 pm Sunday evening. The main
concern is hot temperatures and low humidity coupled with some
moderate north dry winds. To be clear the weather set-up is very
different and not nearly as critical in terms of winds to the
north bay firestorm last october.

Hot temps will develop on Friday and continue to dry out fuels
that are currently running near average in terms of seasonal
dryness. After a mild and dry night Friday another hot day is in
store Saturday with lots of 90s and even some triple digit heat
forecast. As this occurs some dry north winds will come down the
sac valley and first spread over napa county Saturday morning.

Wind gusts should be in the 35-45 mph range. Winds will ease
Saturday afternoon and then another round of north winds will
spread over the north and east bay hills Saturday night. This will
coincide with little or no rh recovery and very warm overnight
temps in the 70s and 80s. Warm to hot weather will continue into
Sunday afternoon but onshore flow will return by late in the day.

Those spending time outside this weekend are urged to be vigilant
with sources of ignition. Any new fire starts, especially in the
grassy fuels will spread rapidly.

Marine As of 4:53 pm pdt Friday... Strong high pressure over
the eastern pacific will maintain moderate to strong northerly
winds across the coastal waters through late Saturday night. The
strongest winds will be located over the northern outer waters.

These sustained strong winds will produce relatively large and
steep winds waves on top of a building northwesterly swell with
moderate periods. Winds will decrease Sunday as a southerly surge
moves up the coast, but remain breezy along the inner coastal
waters.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt arena to pigeon pt 10-60 nm
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... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rowe
aviation: canepa
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi63 min 58°F5 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi51 min WSW 19 G 24 59°F 58°F1010 hPa
PXSC1 19 mi51 min 67°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi51 min WSW 2.9 G 6 67°F 1009.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi33 min WNW 19 G 23 55°F 53°F1010.8 hPa (-2.2)54°F
AAMC1 - 9414750 - Alameda, CA 20 mi51 min WSW 7 G 8.9 65°F 69°F1010.2 hPa
RTYC1 - 9414523 - Redwood City, CA 20 mi45 min 73°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi51 min W 6 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi45 min W 4.1 G 5.1 67°F 1010 hPa
OBXC1 21 mi45 min 66°F 54°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 22 mi43 min NW 16 G 19 57°F 54°F8 ft1012.2 hPa (-1.6)
LNDC1 22 mi45 min W 6 G 7 71°F 1009.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi46 min SSE 8.9 1009 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi51 min ESE 1.9 G 4.1 67°F 64°F1009.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi45 min S 20 G 24 60°F 1009.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi51 min WNW 19 G 25 55°F1010.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi45 min WSW 9.9 G 11 79°F 1008.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi45 min 71°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi51 min W 14 G 15 86°F 70°F1008.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi45 min NW 8.9 G 12 85°F 1007.8 hPa

Wind History for San Francisco, CA
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G18

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi38 minNNW 125.00 miFair with Haze59°F51°F77%1011.8 hPa
San Francisco, San Francisco International Airport, CA12 mi37 minWNW 1610.00 miA Few Clouds67°F50°F55%1009.6 hPa
San Carlos Airport, CA18 mi46 minW 710.00 miClear84°F44°F25%1009.1 hPa
Oakland, Metro Oakland International Airport, CA21 mi40 minW 1210.00 miFair68°F55°F63%1009.8 hPa

Wind History from HAF (wind in knots)
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Last 24hr--NW3CalmNW3N4CalmNE3CalmCalmNE5NE3NE4CalmSW5W6W6W7NW7NW11NW11NW14N12NW13NW8
1 day agoNW10
G15
N11
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N8NW11N11
G14
NW11NW9N8NW9NW9NW8NW10NW9NW7NW9NW8NW9
G15
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2 days ago--NW11NW8NW7NW9NW8NW6NW8NW9NW8N9NW7N9
G14
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G19
NW12
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NW14NW12NW13
G17

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
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Fri -- 01:28 AM PDT     0.96 feet Low Tide
Fri -- 02:31 AM PDT     Moonset
Fri -- 05:49 AM PDT     Sunrise
Fri -- 07:19 AM PDT     3.74 feet High Tide
Fri -- 12:54 PM PDT     1.30 feet Low Tide
Fri -- 03:34 PM PDT     Moonrise
Fri -- 07:31 PM PDT     5.75 feet High Tide
Fri -- 08:34 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.4111.42.12.83.43.73.73.22.61.91.51.31.62.33.24.25.15.75.75.24.22.9

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 02:31 AM PDT     Moonset
Fri -- 02:57 AM PDT     0.01 knots Slack
Fri -- 05:48 AM PDT     Sunrise
Fri -- 05:58 AM PDT     1.04 knots Max Flood
Fri -- 09:04 AM PDT     -0.01 knots Slack
Fri -- 11:37 AM PDT     -0.96 knots Max Ebb
Fri -- 02:47 PM PDT     0.00 knots Slack
Fri -- 03:34 PM PDT     Moonrise
Fri -- 05:57 PM PDT     1.18 knots Max Flood
Fri -- 08:35 PM PDT     Sunset
Fri -- 09:11 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.3-1.1-0.700.60.910.90.60-0.6-0.9-0.9-0.8-0.50.10.71.11.21.10.70.1-0.7-1.2

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.