Saturday, June24, 2017 L-36.com


Marine Weather and Tides
Piedmont, CA

Version 3.4
What's New / NOTES
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 5:46AMSunset 8:36PM Friday June 23, 2017 10:32 PM PDT (05:32 UTC) Moonrise 4:35AMMoonset 7:15PM Illumination 0% Phase: New Moon; Moon at 0 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 San Francisco Bay North Of The Bay Bridge- 854 Pm Pdt Fri Jun 23 2017
.small craft advisory in effect until 11 pm pdt this evening...
.small craft advisory in effect from Saturday afternoon through Saturday evening...
Tonight..SW winds 15 to 25 kt...decreasing to 10 to 20 kt by midnight. Patchy fog after midnight.
Sat..SW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon. Patchy fog in the morning.
Sat night..SW winds 15 to 25 kt...decreasing to 10 to 20 kt.
Sun..SW winds 15 to 25 kt.
Sun night..SW winds 15 to 25 kt.
Mon..SW winds 10 to 20 kt.
Tue..SW winds 10 to 20 kt.
Wed..SW winds 10 to 20 kt.
PZZ500 854 Pm Pdt Fri Jun 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An upper level weather disturbance off the southern california coast will move north tonight, potentially producing isolated Thunderstorms over the southern coastal waters late tonight and Saturday. Otherwise, light southerly winds will continue over the coastal waters tonight before turning westerly and northwesterly and increasing slightly by Saturday afternoon. Wave heights and swell will decrease through the coming days.

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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 240340
afdmtr
area forecast discussion
national weather service san francisco bay area
840 pm pdt Fri jun 23 2017

Synopsis Cooling trend started today for most areas as onshore
flow returns. The far interior valleys will remain seasonably
warm through this evening. The overall trend this weekend and into
next week will be a return to more seasonable temperatures along
with more extensive night and morning low clouds followed by sunny
afternoons.

Discussion As of 8:40 pm pdt Friday... Temperatures cooled
considerably over the last 24 hours as the marine layer gradually
deepened and onshore flow returned. Most locations cooled anywhere
from 5 to 15 degrees with a couple locations dropping as much as
20 degrees from yesterday. High temperatures topped out in the mid
60s to low 70s along the coast, mid 70s to low 80s around the bay
and mid 80s to low 90s over the interior. A few locations managed
to soar into the 100 to 108 range over the warmest southern
interior valleys of monterey and san benito counties. Temperatures
have cooled since this afternoon and with the trend toward cooler
temperatures for Saturday the heat advisory for the interior
portions of the east bay, santa clara county and the mountain of
monterey and san benito counties will be allowed to expire at 9 pm
tonight.

The cooling trend will continue through the next few days with
temperatures falling on average 3 to 5 degrees each day through
the weekend and into early next week. Coastal areas will see
little change while inland temperatures will see larger changes as
cooler marine air reaches farther inland. No heat advisories are
anticipated through the weekend.

Low clouds and patchy fog will also return to the region this
weekend as an approaching upper level trough deepens the marine
layer. Patchy drizzle will also be likely by Monday as the trough
axis moves across the district.

From previous discussion... One major change to the forecast was
to include a slight chance of thunderstorms over monterey san
benito late tonight into Saturday. Confidence is rather low, but
if it verifies impacts could be huge, especially from a fire
weather perspective. For several days now, models have been keying
in on the moisture convection near baja tracking north. Latest
models do bring the mid-upper level moisture (700-500mb) northward
tonight and early Saturday. In addition to the moisture
advection, upper level instability increases. Mu CAPE through the
layer increases with modified total totals greater than 30 all
indicating upper level lift. At this point only giving it a 15 pct
chance of occurring, but still wanted to add it to the forecast.

Medium and longer range models still indicate later next week and
towards the end of the month show more pronounced ridging with
potential for another round of weak offshore flow and associated
warming. CPC has the 6-10 forecast above normal temps for ca.

Aviation As of 4:50 pm pdt Friday... For 00z tafs. Widespread
low clouds and fog continue at the coast and were beginning to
developing locally inland by late Friday afternoon. Marine layer
remains relatively shallow and so ifr ceilings probably won't
develop around sf bay until after evening rush. However, ifr
ceilings will likely develop near monterey bay by early evening.

Onshore flow has increased so there will likely be earlier and
more widespread development of low CIGS overnight. In addition, a
weak upper level disturbance approaching from the south on
Saturday morning will produce some mid high level clouds on
Saturday and delay clearing of low clouds due to deepening marine
layer. Moderate afternoon and evening onshore winds.

Forecast confidence: moderate
vicinity of ksfo...VFR conditions expected to persist through the
evening. Ifr CIGS expected to return overnight tonight, sometime
around 10z at ksfo, and sooner for koak. Westerly winds around 20
knots through early evening, and then diminishing. Low clouds
expected to clear by around 17z Saturday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Similar to yesterday, low CIGS likely to
develop at ksns a few hours before at kmry due to light southerly
flow along the coast. Ifr ceilings then expected overnight and
through much of Saturday morning with later clearing on Saturday
compared to today.

Marine As of 2:29 pm pdt Friday... Light southerly winds will
continue over the coastal waters tonight before increasing
slightly and turning westerly and northwesterly by Saturday
afternoon. Westerly winds through the golden gate gap and across
the northern san francisco bay will be breezy, especially during
the afternoon hours over the next few days. Wave heights and swell
will decrease through the coming days.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 11 pm
public forecast: cw
aviation: dykema
marine: bam
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 5 mi45 min W 8 G 11 59°F 1014.1 hPa
OBXC1 7 mi45 min 58°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi45 min W 7 G 11 59°F 1014.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi45 min WNW 6 G 8.9
AAMC1 - 9414750 - Alameda, CA 7 mi45 min W 5.1 G 7 60°F 67°F1014.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi45 min SW 5.1 G 12 60°F 1014 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi45 min WSW 5.1 G 9.9 58°F 1012.9 hPa
PXSC1 10 mi45 min 58°F 57°F
RCMC1 - 9414863 - Richmond, CA 11 mi45 min WSW 1.9 G 6
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi56 min SW 4.1 58°F 1014 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi45 min SW 5.1 G 9.9
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi45 min SW 15 G 18 60°F 1012.8 hPa
UPBC1 14 mi45 min W 13 G 17
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi45 min W 12 G 16 65°F 72°F1012.7 hPa58°F
PCOC1 - 9415144 - Port Chicago, CA 17 mi45 min WSW 15 G 18 67°F 73°F1011.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi45 min NW 13 G 18 71°F 1010.7 hPa
46237 - San Francisco Bar, CA (142) 22 mi63 min 57°F5 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi45 min NW 7 G 8.9 63°F 76°F1013.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi108 min W 14 69°F 1010 hPa59°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi43 min SW 3.9 G 3.9 57°F 57°F4 ft1014.3 hPa (+0.8)
PRYC1 - 9415020 - Point Reyes, CA 41 mi45 min N 1 G 2.9 59°F 60°F1014.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi43 min SSW 1.9 G 3.9 57°F 55°F5 ft1013.9 hPa (+0.7)

Wind History for Oakland Middle Harbor, CA
(wind in knots)    EDIT      (on/off)   Help
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
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last
24hr
W6
W9
W9
W9
W11
G15
W10
W10
W9
G12
W11
W10
G13
W10
W10
W11
W8
NW9
W10
W11
W10
W10
W10
W5
W9
G12
SW9
W8
G11
1 day
ago
W5
N1
N2
NW3
NE2
N4
--
NE3
W1
NW1
NW2
W1
W3
W4
NW9
W8
G11
NW8
G11
W10
G13
W8
G11
W8
G11
W8
G12
W12
G15
NW8
N3
2 days
ago
SW14
SW11
W2
G5
SW5
W5
SW5
W8
NW6
W4
W8
NW6
NW3
NW7
G11
N3
NW4
W1
W2
W4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi40 minNW 1110.00 miOvercast61°F57°F87%1013.9 hPa
Concord, Buchanan Field, CA13 mi40 minW 610.00 miFair71°F55°F57%1010.8 hPa
Hayward, Hayward Air Terminal, CA14 mi39 minNW 710.00 miFair61°F53°F75%1014.7 hPa
San Francisco, San Francisco International Airport, CA18 mi37 minWNW 1210.00 miA Few Clouds59°F55°F87%1013.7 hPa
San Carlos Airport, CA22 mi38 minNNW 510.00 miFair63°F55°F77%1013.9 hPa
Livermore, Livermore Municipal Airport, CA24 mi40 minNW 910.00 miFair68°F55°F63%1012.1 hPa

Wind History from OAK (wind in knots)
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
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hrNW6NW6NW5N9N7NW5NW6N6NW5N8N8N6W11NW13NW14NW16NW17NW17W16W16W15NW14NW13NW11
1 day agoNW9NW5NW3NW4CalmNW3NW3N3N3NW4NW5NW6W7NW8NW11NW10NW12NW15NW14NW14NW14
G20
NW13
G19
N9N5
2 days agoW4SW8NW4SW5W8W4N4Calm34W4SW6W6W7W7NW10NW12W15W13W11NW10NW8NW6NW8

Tide / Current Tables for Berkeley, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Berkeley
Click for Map
Sat -- 05:48 AM PDT     Sunrise
Sat -- 06:36 AM PDT     Moonrise
Sat -- 06:58 AM PDT     -1.75 feet Low Tide
Sat -- 01:54 PM PDT     5.20 feet High Tide
Sat -- 06:48 PM PDT     2.28 feet Low Tide
Sat -- 08:35 PM PDT     Sunset
Sat -- 09:17 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.16.65.43.61.5-0.2-1.4-1.7-1.3-0.312.53.94.95.24.843.12.52.32.73.74.96

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Oakland Harbor WebStreeter Street
Click for Map
Sat -- 03:14 AM PDT     -1.84 knots Max Ebb
Sat -- 05:48 AM PDT     Sunrise
Sat -- 06:36 AM PDT     Moonrise
Sat -- 07:03 AM PDT     0.00 knots Slack
Sat -- 10:21 AM PDT     1.46 knots Max Flood
Sat -- 01:41 PM PDT     -0.01 knots Slack
Sat -- 03:52 PM PDT     -0.92 knots Max Ebb
Sat -- 06:56 PM PDT     0.00 knots Slack
Sat -- 08:34 PM PDT     Sunset
Sat -- 09:16 PM PDT     Moonset
Sat -- 10:03 PM PDT     1.06 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-0.8-1.5-1.8-1.7-1.3-0.8-00.71.21.41.41.10.5-0.2-0.8-0.9-0.7-0.400.50.91.10.9

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (1,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Sacramento, 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.