Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Atascadero, 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 6:49AMSunset 7:00PM Thursday September 21, 2017 12:41 PM PDT (19:41 UTC) Moonrise 7:13AMMoonset 7:14PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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PZZ645 Point Piedras Blancas To Point Sal Westward Out To 10 Nm- 906 Am Pdt Thu Sep 21 2017
.small craft advisory in effect through late tonight...
Today..NW winds 10 to 20 kt...becoming 15 to 25 kt in the afternoon. Gusts to 30 kt. Combined seas 6 to 8 ft dominant period 12 seconds.
Tonight..NW winds 15 to 25 kt with local gusts to 30 kt in the evening...becoming 15 to 25 kt. Combined seas 6 to 8 ft dominant period 12 seconds.
Fri..Winds variable 10 kt or less...becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 11 seconds.
Fri night..NW winds 15 to 20 kt with gusts to 25 kt in the evening...becoming 10 to 15 kt. Wind waves 2 to 4 ft. NW swell 5 to 6 ft at 12 seconds.
Sat..Winds variable 10 kt or less...becoming nw 10 to 15 kt in the afternoon. Wind waves 2 ft or less. NW swell 5 to 6 ft at 12 seconds.
Sat night..NW winds 15 to 20 kt with gusts to 25 kt in the evening...becoming 5 to 10 kt. Wind waves 1 to 3 ft. NW swell 5 to 6 ft.
Sun..NW winds 10 to 15 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
Mon..N winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft.
PZZ600 906 Am Pdt Thu Sep 21 2017
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 16z...or 9 am pdt...a weak frontal system will move over the coastal waters today. Winds will increase to moderate to strong by this afternoon and evening along with building short-period steep seas.

7 Day Forecast for Marine Location Near Atascadero, CA
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location: 35.46, -120.69     debug


Area Discussion for - Los Angeles/Oxnard, CA
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Fxus66 klox 211558
afdlox
area forecast discussion
national weather service los angeles oxnard ca
858 am pdt Thu sep 21 2017

Synopsis
An upper low over the pacific northwest will drop southward into
nevada today, bringing plenty of clouds, and cool and breezy
weather to the forecast area. There is a chance of showers across
ventura and los angeles counties. The upper low will linger over
nevada into Saturday, keeping temperatures below normal. An upper
level ridge will move eastward from the eastern pacific into the
west coast Sunday through Tuesday, then linger into Wednesday.

Significant warming is expected Sunday and Monday, with well
above normal temperatures persisting into Wednesday.

Short term (tdy-sat)
drizzle light rain scenario playing out almost exactly as expected
this morning across la county and parts of ventura county. Have
had reports of a tenth to a quarter inch of rain along some of the
south facing foothills of the san gabriels while most other areas
range from a trace to a few hundredths. All this a result of a
cold upper level trough dropping south along the west coast
pushing the marine layer up to 5000' or higher. Starting to see
significant clearing north of pt conception this morning and this
should work its way south through the afternoon, though likely
staying pretty cloudy across la county and at least eastern
ventura county with some lingering showers as well, especially in
the foothills.

We'll see increasing west to northwest winds this afternoon and
evening, especially western sb county and the antelope valley.

Models continue to advertise sub advisory level winds in these
areas but could see some isolated gusts near 35 mph in some
favored areas of western sb county and 40-45 in the foothills of
the antelope valley (ie. Lake palmdale area).

***from previous discussion***
there could be some lingering showers across los angeles county
and on the northern slopes this evening. Otherwise, clouds will be
on the decrease, although it will probably stay partly cloudy.

There should be enough cooling to wipe out any marine inversion,
so stratus is not expected to form tonight Fri morning. A large
elongated upper low will extent from western montana across idaho
and nevada during the day Friday. Skies should be mostly sunny to
partly cloudy across the region. There should be a few degrees of
warming due to the extra sunshine, but MAX temps will remain well
below normal for this time of year. There will likely be another
round of sundowner winds across southern sba county Fri evening,
and that is probably the only place that winds will get close
to advisory levels. Fri night will be clear, and it will likely
be the coolest night in quite a while across the region. Models
are hinting that there might be some low clouds across coastal
sections of l.A. County Fri night Sat morning, but confidence that
the marine inversion will become established that quickly is low.

A strong vort rotating southward through the western great basin
will keep the upper low from moving eastward very much on sat.

This should keep MAX temps well below normal across the region,
through possibly a bit higher than those on fri.

Long term (sun-wed)
the upper low will begin to move eastward Sat night and Sunday,
reaching western colorado late Sunday. At the same time, an
amplifying upper ridge in the pacific will move eastward toward
the west coast. Low level gradients are forecast to turn weakly
offshore, possibly strong enough for some locally gusty northeast
winds in the mtns and valleys of l.A. And vtu counties Sun morning.

Heights will rise on Sunday, so expect significant warming across
the region, especially west of the mountains thanks to the
offshore flow. MAX temps will likely get close to 90 degrees
across the warmer locations in the valleys on Sunday.

The upper ridge will continue to amplify on Monday. The 06z run of
the GFS again shows some shortwave energy dropping southwestward
through the great basin, with a closed low developing over
northern arizona Monday. As a result, it shows lower heights over
the region than do either the ec or the its own 00z run. Once
again will ignore this outlier, and will go with the scenarios
showing continued height rises and offshore flow, with a couple
of more degrees of warming in most areas mon.

The ridge axis will move into northern and central ca on tue.

Heights will cont to rise, and low level flow will be offshore.

Tue should be a hot day across most of the region, with highs in
the 90s in most valley locations, and at least lower 90s on the
coastal plain away from the immediate beaches. It is not out of
the question that high temps could approach 100 degrees in the
warmest valley locations on tue.

There will likely be some gusty northeast winds Mon and tue,
especially in the mountains of l.A. And vtu counties, and in
conjunction with the heat and lowering relative humidities, fire
weather danger will likely become heightened.

Heights may actually rise a bit more on Wed as the ridge axis
moves right over the region, so there may be a bit more warming in
the mountains and deserts. A return to onshore flow may bring a
few degrees of cooling to the coastal plain, with little change in
max temps expected in the valleys.

Aviation 21 12z.

At 02z at klax... The inversion was around 6000 feet. The top of
the inversion was around 6900 feet with a temperature of 11
degrees celsius.

Overall... Low to moderate confidence in the current tafs.

There are widespread ifr MVFR conditions across the coastal and
adjacent valley terminals though with a lot of wafting in and out
of the lower values.VFR conditions are expected to return by 17z
though could linger into the afternoon hours particularly in los
angeles county. Otherwise and elsewhereVFR conditions will
prevail.

Klax... Low to moderate confidence in the current taf. Primarily MVFR
conditions through 17z with a ten percent chance of periodic ifr
conditions wafting in and out. Thirty percent chance of MVFR
conditions lingering into the afternoon hours. OtherwiseVFR
conditions will prevail. A fifteen percent chance of east winds
near ten knots 22 06z-16z.

Kbur... Low to moderate confidence in the current taf. Primarily
MVFR conditions through 16z. Thirty percent chance of MVFR
conditions lingering into the afternoon hours. OtherwiseVFR
conditions will prevail.

Marine 21 900 am.

Northwest winds across the outer waters will be at small craft
advisory (sca) levels until mid morning then increase to gale
warning levels through late tonight. Scas will likely be issued
for Friday as the winds begin to diminish on Friday.

A fairly low confidence forecast today as wind speeds are falling
right on the criteria cutoff point between categories. Northwest
winds will reach SCA level across all of the inner waters by late
morning and will continue into this evening or overnight.

Nearshore winds along central coast and across the western santa
barbara channel may increase to gale warning level by late
afternoon.

Steep short-period seas are likely on this afternoon and evening
across much of the waters.

Lox watches warnings advisories
Ca... Wind advisory in effect from noon today to 9 pm pdt this
evening for zones 34-35. (see laxnpwlox).

Wind advisory in effect until 4 am pdt Friday for zones
39-52. (see laxnpwlox).

Wind advisory in effect until 10 pm pdt this evening for zone
59. (see laxnpwlox).

Pz... Small craft advisory in effect until 3 pm pdt this afternoon
for zones 645-650. (see laxmwwlox).

Gale watch in effect from 3 pm pdt this afternoon through
this evening for zones 645-650. (see laxmwwlox).

Small craft advisory in effect until 3 am pdt Friday for zone
655. (see laxmwwlox).

Small craft advisory in effect until 9 am pdt this morning
for zones 670-673-676. (see laxmwwlox).

Gale warning in effect until 3 am pdt Friday for zones
670-673-676. (see laxmwwlox).

Hazard potential outlook (sat-wed)
it will be hot Monday through Wednesday, especially away
from the coast. There will be gusty northeast winds at times,
especially across los angeles and ventura counties. The
combination of heat, gusty winds and low relative humidity
values will bring heightened fire danger, especially to the
mountains and valleys.

Public... Mw db
aviation... Kj
marine... Sweet
synopsis... Db
weather.Gov losangeles


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSLC1 - 9412110 - Port San Luis, CA 20 mi41 min WNW 13 G 17 65°F 59°F1013.9 hPa (+0.0)
CPXC1 20 mi27 min W 20 G 24 64°F 1013.4 hPa49°F
46215 - Diablo Canyon, CA (076) 20 mi44 min 60°F5 ft
46011 - SANTA MARIA - 21 NM Northwest of Point Arguello, CA 39 mi51 min NW 19 G 25 60°F 60°F7 ft1013.4 hPa (+0.7)

Wind History for Port San Luis, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Luis Obispo, San Luis Obispo County-Mc Chesney Field, CA15 mi45 minNW 1710.00 miPartly Cloudy70°F48°F47%1012.6 hPa
Paso Robles Municipal Airport, CA16 mi48 minN 16 G 2110.00 miFair68°F39°F36%1012.4 hPa

Wind History from SBP (wind in knots)
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Last 24hrNW21NW19
G26
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NW14NW11NW8NW8NW7N3NW3CalmNW33NW7NW5CalmCalmNW6NW4NW4W8NW17
1 day agoNW20NW19NW22
G30
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NW14NW13W6W6Calm4W5W4W43W8NW11N12NW13NW14NW12NW15NW14
2 days agoW8NW14NW21
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NW15NW13NW11NW11NW6CalmSW3S3S3CalmCalmNW13NW12NW13W7N10
G18
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G16
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Tide / Current Tables for Morro Beach, Estero Bay, California
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Morro Beach
Click for Map
Thu -- 05:21 AM PDT     0.41 feet Low Tide
Thu -- 06:50 AM PDT     Sunrise
Thu -- 08:13 AM PDT     Moonrise
Thu -- 11:33 AM PDT     5.24 feet High Tide
Thu -- 05:43 PM PDT     0.61 feet Low Tide
Thu -- 07:01 PM PDT     Sunset
Thu -- 08:14 PM PDT     Moonset
Thu -- 11:49 PM PDT     4.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.14.33.2210.40.51.22.33.54.55.25.24.63.72.51.40.80.61.11.9344.7

Tide / Current Tables for Morro Bay, California
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Morro Bay
Click for Map
Thu -- 06:11 AM PDT     0.71 feet Low Tide
Thu -- 06:50 AM PDT     Sunrise
Thu -- 08:13 AM PDT     Moonrise
Thu -- 12:08 PM PDT     4.13 feet High Tide
Thu -- 06:40 PM PDT     0.83 feet Low Tide
Thu -- 07:01 PM PDT     Sunset
Thu -- 08:14 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
43.632.21.510.70.91.52.33.23.84.143.52.821.30.90.91.21.92.73.3

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

GOES Local Image of Southwest    EDIT
Geos

Wind Forecast for Los Angeles/Oxnard, CA (15,3,4,5)
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Ground Weather Radar Station Vandenberg AFB, CA
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weather_mapweather_map weather_map

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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.