Friday, May24, 2019 L-36.com


Marine Weather and Tides
Las Lomas, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:51AMSunset 8:16PM Friday May 24, 2019 6:30 PM PDT (01:30 UTC) Moonrise 12:00AMMoonset 9:58AM Illumination 65% Phase: Waning Gibbous; Moon at 21 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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PZZ535 Monterey Bay- 221 Pm Pdt Fri May 24 2019
Tonight..W winds 10 to 20 kt with gusts up to 25 kt... Diminishing to 5 to 15 kt after midnight. Wind waves around 3 ft this evening...becoming 2 ft or less. W swell 3 to 5 ft at 9 seconds.
Sat..W winds 10 to 20 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 11 seconds.
Sat night..W winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 10 seconds. A chance of showers.
Sun..W winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 6 to 8 ft at 10 seconds. A chance of showers.
Sun night..W winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 7 ft at 10 seconds. A slight chance of showers.
Memorial day..W winds 5 to 15 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 9 seconds.
Mon night..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell around 3 ft at 8 seconds.
Tue..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 2 to 3 ft and sw around 3 ft.
Wed..W winds 5 to 15 kt. Wind waves 2 ft or less. W swell 2 to 3 ft and sw around 3 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 221 Pm Pdt Fri May 24 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northerly flow will develop tonight as a low pressure moves into the great basin. Gusty winds will continue into the upcoming weekend. Moderate northwest swell will continue through the weekend with steep fresh swell generated by the gusty winds.


7 Day Forecast for Marine Location Near Las Lomas, CA
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location: 36.86, -121.76     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 250112
afdmtr
area forecast discussion
national weather service san francisco bay area
612 pm pdt Fri may 24 2019

Synopsis Mainly dry conditions are forecast through Saturday,
along with continued cooler than normal temperatures.

Unseasonably cool and unsettled conditions are forecast to develop
later in the weekend as a system drops in from the north, with
scattered showers maybe a stray thunderstorm possible on Sunday.

Dry weather should return by memorial day, but temperatures will
remain cool into early next week.

Discussion As of 1:32 pm pdt Friday... Visible satellite
imagery shows some areas of low clouds lingering over parts of the
san francisco and monterey bay areas this early afternoon. These
low clouds are preventing efficient solar heating thus far this
afternoon for some locations. For example, the sonoma county
airport (ksts) is running 12 degrees cooler than this time 24
hours ago as a consequence to the marine stratus. The most recent
satellite trends reveal that clearing is occurring in the north
bay valleys, but with the delayed sunshine, have gone ahead and
dropped afternoon maximum temperatures for most north bay
locations by several degrees. The east bay south of the bay bridge
as well as the south bay have been mostly sunny since mid-
morning, and are actually running several degrees warmer than 24
hours ago. By the time the afternoon wraps up, high temperatures
along the coast will warm to the upper 50s to 60s while interior
locations will warm to the middle upper 60s to middle 70s. These
values equate to about 3 to 9 degrees below late may
climatological normal values.

If you're looking for warm weather in the bay area for the
holiday weekend, I do not have good news for you. There is high
confidence of continued below normal temperatures through memorial
day as another upper level low drops south from the pacific
northwest by the second half of the weekend. This upper low will
bring a reinforced shot of cooler air, as well as another
opportunity of rain showers on Sunday. Snow levels will drop to
around 5,000 ft, per the official forecast and the national blend
of models (nbm); however, the 12z run of our local in-house wrf
drops snow levels to 4,200 to 4,500 ft for some locations. Just to
quantify how anomalous this upper low is -- the 850 mb
geopotential height levels over our area are forecast to
correspond to about -3 to -4 sigma (standard deviations) with
respect to the 1979-2009 climate forecast system reanalysis
(cfsr). At the surface, these temperatures will translate to about
10 to 20 degrees below normal. Hikers, campers, and outdoor
enthusiasts with plans to head to the higher elevations on Sunday
should plan accordingly for cold temperatures and rain showers, as
well as the possibility of isolated snow showers if snow levels
drop lower than the present official forecast. Will also have to
keep a close eye on the possibility of thunder for parts of the
area, but for now think the best odds will be to our east in the
sierra.

For memorial day, temperatures should begin to rebound as the
upper low exits the area with highs in the 50s and 60s along the
coast and middle 60s to near 70 for inland communities. Can't rule
out some lingering showers in the mountains during the day, but
think most locations will be dry for the holiday itself. Temperatures
will continue to moderate through the middle of next week with
the nbm bringing back some 80 degree readings returning to the
warmest locations by Wednesday or Thursday. With that said, though,
both the GFS and ECMWF are keeping a trough over the west coast, so
temperatures will likely just return back to near normal values.

There is hope for those waiting for warmer weather -- the climate
prediction center's 8-14 day outlook does begin to favor the
likelihood of experiencing above normal temperatures for the june
1 to 7 period.

Aviation As of 6:12 pm pdt Friday... It'sVFR inland except for
a few brief isolated late day showers over easternmost santa clara
county and a group of showers and thunderstorms over lake county
entering northernmost napa county. Convective potential diminishes
with the loss of daytime warming, but a few showers and lingering
lightning strikes may reach into northern napa county for a couple
more hours.

Coastal low clouds with an embedded surface to lower level cyclonic
eddy circulation seen per visible imagery will fill in along the
coast and spread MVFR ceilings inland this evening. A fairly rapid
succession of lower level thermal ridging to a mainly dry cool front
approx 300 miles NW of san francisco will accelerate southeast to
approx 30 mph per GFS and ECMWF theta-e forecasts later tonight into
Saturday morning. Forecast is MVFR ceilings trending lower to ifr
ceilings as cloud ceilings become increasingly compressed under
temporary subsidence and prefrontal convergence; latest NAM also
forecasts pockets of light drizzle rain, the hrrr also similarly
showing smaller pocket of QPF on the san mateo coast. GFS and
ecmwf theta-e show the cool front clearing well to our south later
Saturday. Post cool frontal winds in the spring season are often
breezy to gusty thus decided to bump up Saturday's winds in the
tafs up over statistical guidance at least for ksfo, koak, ksjc.

Statistical guidance then showing increasing winds arriving Saturday
night.

Model differences in boundary layer rh lowers confidence as to how
quickly low clouds may clear Saturday, for now tafs lean toward sct-
bkn MVFR cloud coverage for much of the day. Pilots should plan on
gusty winds, lowering freezing levels over the CWA over the holiday
weekend and convection some of which could be borderline isolated
severe with the arrival of a deep cold core mid to upper low Sunday.

Vicinity of ksfo... Low clouds converging along the coast with lower
level cooling forecast by the NAM through mid-late evening. Tempo
MVFR 03z-05z then prevailing MVFR tonight. West winds generally up
over 12 knots tonight then increasingly gusty around cool frontal
passage Saturday morning, cool frontal passage occurs by 15z. Gusty
post frontal winds Saturday lasting into Saturday night. Sct-bkn
MVFR ceilings Saturday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... W-nw winds near 10 knots with low clouds
developing early this evening. MVFR locally ifr ceilings tonight,
coastal drizzle or light rain possible later tonight into Saturday
morning, not in tafs presently, will amend as needed. Winds likely
becoming gusty Saturday, may need to bump up winds a bit more than
presently advertised in 00z tafs.

Marine As of 5:07 pm pdt Friday... Gusty northerly flow will
develop tonight as a low pressure moves into the great basin.

Gusty winds will continue into the upcoming weekend. Moderate
northwest swell will continue through the weekend with steep fresh
swell generated by the gusty winds.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm until 3 am
glw... Pt arena to pigeon pt 10-60 nm from 3 am
sca... Pt arena to pt reyes 0-10 nm from 9 pm until 3 am
glw... Pt arena to pt reyes 0-10 nm from 3 am
sca... Pt reyes to pigeon pt 0-10 nm from 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
public forecast: rowe
aviation: canepa
marine: mm
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 3 mi105 min WNW 7 62°F 1015 hPa55°F
MLSC1 - Moss Landing, South Harbor, CA 4 mi40 min W 9.9 G 25 58°F 1014.8 hPa (-1.3)53°F
46092 - MBM1 16 mi67 min W 14 56°F 57°F1014.7 hPa (-2.0)
46240 - Cabrillo Point, Monterey Bay, CA (158) 18 mi30 min 60°F3 ft
MEYC1 19 mi54 min 60°F1015 hPa
46114 - West Monterey Bay, CA 33 mi30 min 57°F6 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 34 mi40 min WNW 14 G 16 56°F 58°F5 ft1014.3 hPa (-1.7)
46239 - Point Sur, CA (157) 40 mi30 min 58°F6 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA6 mi37 minW 610.00 miFair61°F53°F75%1014.3 hPa
Salinas, Salinas Municipal Airport, CA16 mi37 minNW 1210.00 miFair64°F51°F63%1015.2 hPa
Monterey Regional Airport, CA19 mi36 minWNW 910.00 miPartly Cloudy60°F50°F70%1015.9 hPa
Hollister, CA, CA19 mi35 minWSW 1810.00 miFair and Breezy66°F53°F64%1013.5 hPa

Wind History from WVI (wind in knots)
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Last 24hrW4CalmW4CalmCalmCalmNW3W3CalmCalmCalmCalmCalmCalmW3SW4W7SW7W9W10W7W9W8W6
1 day agoCalmNE5E5NE4E6E5E6CalmCalmCalmCalmS3S3SE5CalmCalmS6S5S7SW7SW6SW5W63
2 days agoNW8
G15
W9W53W5W3W5W6N4CalmE3CalmN3Calm345SW9--SW10SW10SW8
G16
W7W9

Tide / Current Tables for Elkhorn Slough railroad bridge, California
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Elkhorn Slough railroad bridge
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Fri -- 12:44 AM PDT     Moonrise
Fri -- 02:46 AM PDT     4.48 feet High Tide
Fri -- 05:53 AM PDT     Sunrise
Fri -- 09:43 AM PDT     -0.19 feet Low Tide
Fri -- 10:58 AM PDT     Moonset
Fri -- 05:36 PM PDT     4.12 feet High Tide
Fri -- 08:15 PM PDT     Sunset
Fri -- 10:35 PM PDT     2.90 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.64.14.44.54.23.52.51.40.5-0.1-0.20.10.71.52.33.13.74.14.13.93.53.22.92.9

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
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Fri -- 12:44 AM PDT     Moonrise
Fri -- 01:37 AM PDT     0.29 knots Max Flood
Fri -- 04:12 AM PDT     -0.00 knots Slack
Fri -- 05:54 AM PDT     Sunrise
Fri -- 07:40 AM PDT     -0.72 knots Max Ebb
Fri -- 11:00 AM PDT     Moonset
Fri -- 11:50 AM PDT     0.00 knots Slack
Fri -- 03:00 PM PDT     0.54 knots Max Flood
Fri -- 06:30 PM PDT     -0.00 knots Slack
Fri -- 08:15 PM PDT     Sunset
Fri -- 08:31 PM PDT     -0.30 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.30.30.20-0.2-0.5-0.7-0.7-0.6-0.4-0.200.30.50.50.50.40.1-0.1-0.3-0.3-0.2-0.2

Weather Map and Satellite Images
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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.