Thursday, August22, 2019 L-36.com


Marine Weather and Tides
Danville, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:28AMSunset 7:53PM Thursday August 22, 2019 11:15 AM PDT (18:15 UTC) Moonrise 10:53PMMoonset 12:03PM Illumination 54% Phase: Third Quarter Moon; Moon at 22 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
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 916 Am Pdt Thu Aug 22 2019
Today..SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon.
Tonight..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 10 to 15 kt.
Sat..SW winds 10 to 15 kt.
Sat night..SW winds 5 to 10 kt.
Sun..SW winds 15 to 20 kt.
Mon..SW winds 15 to 20 kt.
PZZ500 916 Am Pdt Thu Aug 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase across the coastal waters today. Infrequent gale force gusts will also be possible in the outer waters north of point reyes. Winds will weaken drastically on Friday and become southwesterly along the coast. Mixed seas will continue with shorter period northwest waves around 6 seconds, a light longer period west swell, and a light southerly swell.


7 Day Forecast for Marine Location Near Danville, CA
   Hourly   EDIT   Help
location: 37.79, -122     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 221752
afdmtr
area forecast discussion
national weather service san francisco bay area
1052 am pdt Thu aug 22 2019

Synopsis Muggy and warm day will prevail across the bay area
today. There will be some subtle cooling Friday, as stronger
onshore flow develops but no big changes of note. High pressure
will rebuild over the weekend, with hot inland temperatures
conditions developing. The ridge will take hold through early
next week. The remnants of ivo will then pass west of the bay
area midweek, increasing clouds and bringing the return of some
muggy conditions.

Discussion As of 8:50 am pdt Thursday... Water vapor imagery
shows a pretty potent upper level disturbance moving inland across
the intermountain west this morning. The tail end of this system
continues to sag south across central california, bringing some
high clouds to the region. Of more significant note though is the
airmass that also arrived with this system. Dew point temperatures
increased substantially last night with the surface boundary,
rising into the lower and mid 60s. This made for a very mild but
also muggy night across the region, keeping most areas in the 60s.

It also allowed for some patchy dense fog to form in the coastal
areas this morning. Half moon bay, pacific grove, and carmel. We
have even had some reports of drizzle, even though the marine
layer is quite shallow. These muggy conditions will be with us
through the day today, making it feel much more like hawaii than
central california. Temperatures should be down a little from
those of yesterday, especially inland, but it will still be warm.

And given the muggy conditions, it will continue to feel down
right hot for our inland valleys.

Drier air should filter into the region later this evening and
into the overnight hours, with things returning back to more
normal type conditions. Friday will see minor cooling across the
region, but warmer conditions will develop once again for this
weekend, as high pressure builds back across the region. Inland
areas should be down right hot through the weekend and early next
week, with temperatures once again in the 90s and flirting with
100 on Saturday in the warmer spots. Triple digit heat is likely
for our hottest spots on Sunday and Monday as well. Will have to
watch things for the middle part of the work week, as the remnants
of what will become hurricane ivo look like they could head this
way and make things interesting. However, there is still plenty of
time for the models to change their course on that thought, so
will just wait to see what the 12z models suggest. Palmer

Previous discussion as of 3:42 am pdt Thursday
there was a frontal boundary that passed well to our north
Wednesday. As the feature washed out over the bay area it brought
with it a change in airmass that we dont often feel around here in
the summertime. A look at the precipitable water (tpw) charts
shows a 1.5-2.0 inch tpw plume pointed right at the bay area. If
this was the wintertime we would probably be talking about an
atmospheric river. The current percent of normal tpw values are in
excess of %200 of normal. Anyway its manifesting itself over the
bay area right now with very high dewpoints. At 3 am most sites
were reporting dewpoints in the mid 60s with temps in the upper
60s, giving us the muggy feel. Stepping outside it feels more like
san diego with a warm marine layer.

Given the warm start it wont take much for temps to warm back up
to similar values to yesterday. That being said do expect a few
degrees of cooling, especially inland as we will be losing the dry
north winds we had yesterday that allowed sonoma airport to reach
97. The high dewpoint airmass will make things feel warmer and may
cause some uncomfortableness for those sensitive to heat or
working outside for long period of time.

Looking ahead to Friday there should be more noted cooling.

Looking at the NAM boundary layer theta-e suggests we will see an
airmass change by this evening into Friday as drier air filters in
and stronger onshore flow sets-up. Stronger NW winds over the
ocean should induce some coastal upwelling as well. There often
isn't too much delay in getting the sst to drop a few degrees.

This all points to at least some cooling for Friday.

Following the ECMWF solution a 594 dm high may try and rebuild
over the region as early as Saturday afternoon. Expect inland
areas to heat up once again this weekend with latest MOS guidance
suggesting mid 90s inland for Sunday afternoon. The coast should
hold onto the marine layer as the strong high will compress the
inversion layer and keep seabreezes fairly week through the
weekend into early next week.

The ridge will hold strong at least through Monday. Attention will
then turn to the remnants of tropical storm ivo working its way
northward. At the very least we should expect to see some
increasing mid and high clouds by Tuesday and weds along with
another round of high dewpoint air being transported northward.

Current deterministic model solutions keep any moisture and
instability offshore or over far northern california. However,
this will need to be watched closely for any t-storm threat.

Aviation As of 10:50 am pdt Thursday... A wetter, more
compressed marine layer this morning brought widespread low
ceilings to terminals. As of 1045am, the marine layer has all but
dissipated from the non-coastal sf bay area, however, it
continues to linger along the pacific coastline from sonoma county
southward. A weak otter eddy in the monterey bay is also keeping
patchy fog and vlifr to borderline ifr MVFR CIGS across the lip of
the monterey bay and down the northern portion of the salinas
valley. Expect to see all but kmry return toVFR by 18z, with kmry
under clouds until the 19-20z timeframe. For today, light to
locally breezy, with lighter winds than yesterday but still
occasionally gusty in coastal gaps (such as the san bruno gap near
ksfo). Some passing high clouds through midday. For tonight,
marine layer will be similar if not slightly more compressed --
which means lower ceilings, increased chance of fog drizzle into
sunrise, and slightly earlier mix out times Friday morning.

Vicinity of ksfo... VFR today with a few to scattered high clouds.

West winds increasing this afternoon evening with gusts to around
27kt after 21z. Similar marine layer situation for tonight with
slightly lower heights than this morning.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Otter eddy in the bay keeping low cigs
and patchy fog around the lip of the bay. Ksns should clear out
very shortly while kmry may linger under clouds into the lunch
hour or early afternoon. Predominately light but occasionally
breezy onshore winds today. Similar marine layer situation tonight
albeit with slightly lower ceilings increased chance of
fog drizzle.

Marine As of 10:44 am pdt Thursday... Northwest winds will
increase across the coastal waters today. Infrequent gale force
gusts will also be possible in the outer waters north of point
reyes. Winds will weaken drastically on Friday and become
southwesterly along the coast. Mixed seas will continue with
shorter period northwest waves around 6 seconds, a light longer
period west swell, and a light southerly swell.

Mtr watches warnings advisories
Tday Sca... Mry bay from 1 pm
sca... Pigeon pt to pt pinos 0-10 nm from 1 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: palmer rww
aviation: drp
marine: drp
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
LNDC1 15 mi46 min WSW 2.9 G 4.1 66°F 1010 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi52 min SW 2.9 G 4.1 65°F 71°F1010.5 hPa
UPBC1 18 mi52 min NW 8 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi46 min SW 4.1 G 5.1 67°F 1010 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 18 mi46 min NNW 6 G 8 79°F 1008.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi46 min SW 4.1 G 5.1
PCOC1 - 9415144 - Port Chicago, CA 18 mi46 min W 9.9 G 11 74°F 72°F1009.3 hPa
OBXC1 18 mi46 min 65°F 65°F
MZXC1 - 9415102 - Martinez-Amorco CA 18 mi46 min WNW 8.9 G 9.9 74°F 72°F1009.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi52 min SSW 6 G 8 64°F 1010.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi52 min NNW 4.1 G 5.1 65°F 1009.1 hPa
PXSC1 21 mi46 min 65°F 65°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi52 min W 5.1 G 7 72°F 1009.3 hPa
RTYC1 - 9414523 - Redwood City, CA 23 mi46 min N 2.9 G 5.1 70°F 75°F1010.5 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi46 min 66°F
FTPC1 - 9414290 - San Francisco, CA 25 mi52 min SW 8.9 G 12 63°F 64°F1010.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi41 min SSW 7 68°F 1010 hPa (+0.0)
SFXC1 - San Francisco Bay Reserve, CA 28 mi91 min W 5.1 76°F 1009 hPa67°F
46237 - San Francisco Bar, CA (142) 34 mi46 min 60°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi26 min NW 16 G 19 59°F 60°F6 ft1011.1 hPa

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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
24hr
S2
SW2
W4
G7
SW5
W6
W6
G9
W8
G13
W8
G12
W8
W8
G11
S1
W6
G9
SW3
G6
W5
SW3
W3
W5
S2
SW7
SW6
SW4
W4
SW3
SW2
1 day
ago
W6
W8
G11
W9
W10
G14
W8
G11
W11
G15
W11
G15
W8
G13
W11
G15
W8
G11
W7
G11
SW4
W2
SW8
G11
SW9
SW7
G10
SW9
SW8
SW8
G11
E2
SW2
SE3
SE5
SE4
2 days
ago
SW7
SW5
W7
W10
G13
W11
W10
W9
W8
G12
W7
G10
W5
G9
W5
SW6
W6
G9
W11
W9
G12
W7
G11
W8
G14
W7
W6
G12
W8
G12
W6
G10
W7
W4
W7
G10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA11 mi22 minWSW 410.00 miFair74°F64°F74%1010.7 hPa
Livermore, Livermore Municipal Airport, CA11 mi23 minSSW 410.00 miFair79°F64°F62%1009 hPa
Concord, Buchanan Field, CA13 mi23 minVar 410.00 miFair83°F63°F51%1007.7 hPa
Oakland, Metro Oakland International Airport, CA13 mi23 minSW 310.00 miA Few Clouds71°F63°F76%1010.2 hPa
San Carlos Airport, CA22 mi89 minVar 48.00 miA Few Clouds72°F66°F83%1010.2 hPa
San Francisco, San Francisco International Airport, CA22 mi80 minNW 810.00 miMostly Cloudy70°F61°F73%1009.8 hPa

Link to 5 minute data for KLVK

Wind History from LVK (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 24hr5SW8W6W11W13W13W11SW9W5SW5SW6SW9SW7W6W9W9SW5SW6CalmW5SW4W5NW4S4
1 day agoW10
G15
W13W11NW8W10W12W14W12NW8W8SW6W5CalmCalmCalmW3CalmCalmNW3CalmCalmCalmCalmSW3
2 days agoNW8NW10NW12NW14W16W17W14W13NW10W10W10W4W5W4SW3S4W8W5W6SW4SW6NW7W106

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Roberts Landing
Click for Map
Thu -- 12:06 AM PDT     1.84 feet Low Tide
Thu -- 05:46 AM PDT     5.41 feet High Tide
Thu -- 06:30 AM PDT     Sunrise
Thu -- 11:45 AM PDT     2.30 feet Low Tide
Thu -- 01:03 PM PDT     Moonset
Thu -- 05:53 PM PDT     6.83 feet High Tide
Thu -- 07:52 PM PDT     Sunset
Thu -- 11:53 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
7
pm
8
pm
9
pm
10
pm
11
pm
1.82.12.83.74.65.35.45.14.53.72.92.42.32.73.64.65.76.66.86.55.84.73.52.5

Tide / Current Tables for Oakland Harbor High Street Bridge, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Oakland Harbor High Street Bridge
Click for Map
Thu -- 02:05 AM PDT     1.03 knots Max Flood
Thu -- 05:25 AM PDT     -0.00 knots Slack
Thu -- 06:30 AM PDT     Sunrise
Thu -- 07:47 AM PDT     -0.91 knots Max Ebb
Thu -- 11:07 AM PDT     0.00 knots Slack
Thu -- 01:04 PM PDT     Moonset
Thu -- 02:10 PM PDT     1.06 knots Max Flood
Thu -- 05:18 PM PDT     -0.00 knots Slack
Thu -- 07:52 PM PDT     Sunset
Thu -- 08:18 PM PDT     -1.31 knots Max Ebb
Thu -- 11:53 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
7
pm
8
pm
9
pm
10
pm
11
pm
0.30.810.90.60.2-0.3-0.8-0.9-0.7-0.4-00.40.81.110.60.2-0.4-0.9-1.3-1.2-0.9-0.6

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 (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.