Thursday, June21, 2018 L-36.com


Marine Weather and Tides
Piedmont, 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 5:45AMSunset 8:36PM Thursday June 21, 2018 1:13 AM PDT (08:13 UTC) Moonrise 1:33PMMoonset 12:59AM Illumination 55% Phase: First Quarter Moon; Moon at 8 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 849 Pm Pdt Wed Jun 20 2018
Small craft advisory in effect until midnight pdt tonight...
Tonight..SW winds 15 to 25 kt.
Thu..SW winds 5 to 15 kt.
Thu night..W winds 10 to 20 kt...becoming sw 10 kt after midnight.
Fri..SW winds 10 to 20 kt.
Fri night..SW winds 10 to 20 kt.
Sat..W winds 10 to 20 kt.
Sun..SW winds 10 to 20 kt.
Mon..SW winds 10 to 20 kt. Patchy fog.
PZZ500 849 Pm Pdt Wed Jun 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1023 mb high pressure was located about 650 miles west of Monterey bay. This high will move north and strengthen Thursday and Friday. Gusty northwest winds are expected along much of the waters through Thursday. Strongest winds will shift north on Friday. Gale force winds will be possible over the northern outer waters Friday night. A light southerly wind will develop along the big sur coast Sunday.

7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 210535
afdmtr
area forecast discussion
national weather service san francisco bay area
1035 pm pdt Wed jun 20 2018

Synopsis Not much change in weather conditions through
Thursday, then a pronounced warming trend at the end of the week
and into the first part of the weekend as high pressure builds in
and winds turn more offshore. Cooling temperatures and
redevelopment of the marine layer appears in store for Sunday into
the first part of next week as flow shifts back onshore.

Discussion As of 9:20 pm pdt Wednesday... Brisk onshore flow
kept temperatures on the cool side of normal today across most of
our region. Onshore flow overnight will allow low clouds to
develop around san francisco bay and into the coastal valleys.

However, the marine layer is relatively shallow with a depth
around 1200 feet, so it's unlikely we will see widespread low
clouds develop inland overnight. Thursday is expected to be a day
much like today with low clouds clearing back to the coast by
midday. The models indicate a slight reduction in onshore flow
tomorrow as a weak shortwave trough over far northern california
moves off to the east. Thus, high temperatures tomorrow will
likely be a few degrees warmer than today in most places.

A robust warming trend is forecast to get underway on Friday as an
upper ridge amplifies just off the west coast and as onshore flow
diminishes. Coastal temperatures will warm into the upper 60s and
70s on Friday, while inland areas warm into the upper 80s and 90s.

A few triple digit highs may occur in the warmest locations on
Friday. Saturday is expected to be the warmest day as the ridge
axis edges closer to the coast and light offshore flow briefly
develops. Coastal temperatures are difficult to forecast for
Saturday since much will depend on the strength and duration of
offshore flow. Downtown san francisco is currently expected to
warm into the low to mid 80s on Saturday, while san francisco
oceanside may remain in the 60s. Inland temperatures are forecast
to climb well into the 90s to 105 on Saturday. Heat advisories
may be needed for Saturday when potential heat risks climb into
the high category for some inland areas.

From previous discussion... Another thing to mention for the late
Friday to Saturday timeframe is the potential for gusty winds in
the higher elevations. The GFS does advertise north to northeast
winds for the north and east bay hills mountains that could
produce elevated fire weather concerns. Will continue to monitor
these forecast trends, especially as we approach the event when
the higher resolution models are able to capture this with finer
detail.

Models for Sunday suggest the start of what would be a welcomed
cooling trend across the interior heading into next week. The
latest GFS run even brings in what could be a southerly surge
along the big sur coast, pushing north toward the santa cruz and
san mateo coasts through the day. Additional cooling is expected
for much of the region -- especially interior locations -- heading
into next week.

Aviation As of 10:30 pm pdt... Marine layer is a little
shallower than yesterday at around 1000 feet but the inversion is
stronger as the airmass aloft warms. Moderate northwest onshore
flow is in just the right direction to push stratus into sfo and
oak earlier than expected while keeping most of mry bay clear
except for the mry peninsula. Still expecting clouds to spread
around the bay later tonight with typical late morning clearing
Thursday.

Vicinity of ksfo... MVFR CIGS becoming ifr after 08z.

Clearing after 17-18z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS spreading into sns later tonight
clearing sns after 16z and mry after 17z.

Fire weather As of 3:30 pm pdt Wednesday... A pronounced
warming and drying trend is forecast for the end of the week as
high pressure builds in and winds turn offshore. Saturday
presently looks to be the hottest day, with poor overnight
relative humidity recoveries for both Friday night and Saturday
night. Locally gusty north to northeast winds are possible in the
north and east bay hills Friday night and Saturday morning. A
return to cooling and redevelopment of the marine layer appears in
store for Sunday into the first part of next week as flow shifts
back onshore.

Marine As of 10:23 pm pdt Wednesday... A 1023 mb high pressure
was located about 650 miles west of monterey bay. This high will
move north and strengthen Thursday and Friday. Gusty northwest
winds are expected along much of the waters through Thursday.

Strongest winds will shift north on Friday. Gale force winds will
be possible over the northern outer waters Friday night. A light
southerly wind will develop along the big sur coast Sunday.

Mtr watches warnings advisories
Tngt Sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm from 12 am
glw... Pt pinos to pt piedras blancas 0-10 nm until 12 am
sca... Sf bay until 12 am
sca... Mry bay until 12 am
public forecast: dykema mm
aviation: W pi
marine: W pi
fire weather: blier rowe
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi43 min Calm G 1.9 55°F 1016.1 hPa
OBXC1 7 mi43 min 55°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi43 min SSW 7 G 11 55°F 1016.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi43 min SSW 8 G 12
AAMC1 - 9414750 - Alameda, CA 7 mi43 min WSW 1 G 2.9 55°F 67°F1016.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi49 min S 12 G 14 56°F 1016.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi43 min W 4.1 G 9.9 54°F 1015 hPa
PXSC1 10 mi43 min 55°F 53°F
RCMC1 - 9414863 - Richmond, CA 11 mi43 min SSE 8 G 12 56°F 62°F1015.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi44 min Calm 55°F 1016 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi43 min WSW 7 G 12 53°F 57°F1015.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi43 min WSW 5.1 G 7 59°F 1014.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi43 min WNW 8 G 8.9 60°F 66°F1014.7 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 17 mi43 min SSW 8 G 14 56°F 68°F1014.3 hPa
46237 - San Francisco Bar, CA (142) 22 mi73 min 53°F5 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi49 min WNW 9.9 G 14 63°F 1013.1 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi43 min WNW 7 G 9.9 56°F 70°F1016.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi88 min W 8.9 56°F 1014 hPa51°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi33 min NW 19 G 25 54°F 53°F1016.8 hPa54°F
PRYC1 - 9415020 - Point Reyes, CA 41 mi43 min WNW 17 G 21 55°F1016.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi83 min NW 16 G 18 54°F 53°F6 ft1017.7 hPa (+0.0)

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi20 minWSW 1110.00 miOvercast55°F51°F87%1016.4 hPa
Concord, Buchanan Field, CA13 mi20 minSSW 14 G 2110.00 miFair58°F50°F75%1013.3 hPa
Hayward, Hayward Air Terminal, CA14 mi19 minWSW 910.00 miOvercast57°F50°F78%1017.4 hPa
San Francisco, San Francisco International Airport, CA18 mi17 minW 1310.00 miMostly Cloudy56°F48°F77%1016.3 hPa
San Carlos Airport, CA22 mi18 minN 010.00 miFair55°F50°F82%1016.6 hPa
Livermore, Livermore Municipal Airport, CA24 mi20 minW 410.00 miFair52°F0°F%1015.6 hPa

Wind History from OAK (wind in knots)
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Last 24hrW8W11W12W9W7W6SW6W8W9W8W7W13W13W14W13W14W16W19W16W16W12W13W10W11
1 day agoNW7NW8W9W9W6W5W5SW7W5W11W8W10
G16
W13W9W18W13W17W16W12W13W8W10W9W8
2 days agoCalmN4N4N7NW7W8W6W35W7NW9NW9W17W16W15NW11W17W16W15W13W8W8W5NW8

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Berkeley
Click for Map
Thu -- 01:50 AM PDT     1.50 feet Low Tide
Thu -- 01:59 AM PDT     Moonset
Thu -- 05:47 AM PDT     Sunrise
Thu -- 07:21 AM PDT     4.29 feet High Tide
Thu -- 01:26 PM PDT     0.78 feet Low Tide
Thu -- 02:33 PM PDT     Moonrise
Thu -- 08:14 PM PDT     6.01 feet High Tide
Thu -- 08:34 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.21.61.51.82.43.23.94.34.23.72.921.30.80.91.42.33.54.65.565.85.14.1

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Thu -- 01:47 AM PDT     0.01 knots Slack
Thu -- 01:59 AM PDT     Moonset
Thu -- 04:49 AM PDT     0.68 knots Max Flood
Thu -- 05:47 AM PDT     Sunrise
Thu -- 07:27 AM PDT     -0.00 knots Slack
Thu -- 10:03 AM PDT     -0.83 knots Max Ebb
Thu -- 01:42 PM PDT     0.00 knots Slack
Thu -- 02:32 PM PDT     Moonrise
Thu -- 05:07 PM PDT     0.92 knots Max Flood
Thu -- 08:03 PM PDT     -0.00 knots Slack
Thu -- 08:34 PM PDT     Sunset
Thu -- 11:04 PM PDT     -1.01 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-0.30.10.40.60.70.60.2-0.3-0.7-0.8-0.8-0.6-0.30.10.50.80.90.80.60-0.5-0.9-1

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 (4,6,7,8)
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Ground Weather Radar Station Sacramento, 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.