Saturday, June23, 2018 L-36.com


Marine Weather and Tides
Emerald Lake Hills, 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 5:47AMSunset 8:35PM Saturday June 23, 2018 4:29 PM PDT (23:29 UTC) Moonrise 3:34PMMoonset 2:03AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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
PZZ545 Point Reyes To Pigeon Point To 10 Nm- 214 Pm Pdt Sat Jun 23 2018
.small craft advisory in effect until 9 pm pdt this evening...
.small craft advisory in effect from late tonight through Sunday afternoon...
Tonight..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 10 seconds.
Sun..S winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog in the morning.
Sun night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft at 9 seconds. Patchy fog after midnight.
Mon..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog in the morning.
Mon night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 9 seconds. Patchy fog after midnight.
Tue..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft...increasing to 5 to 7 ft. Patchy fog.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft. SWell S 3 ft. Patchy fog.
Thu..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 4 to 6 ft. SWell S 3 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a dominant period of 9 seconds. Across the bar...combined seas 5 to 7 ft with a dominant period of 9 seconds. Maximum ebb current of 3.3 knots at 01:31 am Sunday and 1.7 knots at 01:43 pm Sunday.
PZZ500 214 Pm Pdt Sat Jun 23 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and a thermal trough over inland california will keep gusty northerly winds across the coastal waters through tonight. Gusty winds will generate steep wind waves creating hazardous sea conditions, particularly for small vessels. Winds will subside tonight as a southerly surge pushes northward shifting the winds along the inner coastal waters out of the south. Winds will pick up again on Monday as an upper trough moves through to the north.

7 Day Forecast for Marine Location Near Emerald Lake Hills, CA
   Hourly   EDIT   Help
location: 37.44, -122.34     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 232139
afdmtr
area forecast discussion
national weather service san francisco bay area
239 pm pdt Sat jun 23 2018

Synopsis Very warm to hot temperatures are forecast for the
interior today as high pressure dominates the weather pattern.

Additionally, offshore winds will develop and result in heightened
fire weather concerns for portions of the region today through
Sunday. Cooling is then expected by Sunday and into early in the
upcoming week with increased onshore flow.

Discussion As of 2:45 pm pdt Saturday... A 594dm 500mb high
pressure dome of hot, dry air is amplifying along the west coast
early this afternoon. 850mb temperatures are expected to push into
the 25-26c range within the next few hours as the ridge builds
inland. This warm air advection and subsidence of this air mass
will translate into one of the hottest days of the year for most
inland locations, with temperatures on average 12 to 20 degrees
above seasonal normals. Many of the hottest locations, such as the
inland east bay, pinnacles national park, and the northern reaches
of the north bay have already broken triple digits as of early
this afternoon with several more hours of sunlight remaining. 104f
at arroyo seco raws is the highest temperature reported as of 2pm
and is expected to push beyond 105f by the end of the day.

Temperatures are noticeably cooler closer to the coast, running
only 3 to 6 degrees above normal, but temperatures ramp up quickly
away from the coast. These temperatures are around 2 standard
deviations above the norm, which generally does not translate to
record temperatures (usually 3+ standard deviations are required),
however, concords record of 102f set in 2017 will likely be
challenged in the next few hours. Kccr (concord airports asos
identifier) is currently sitting at 101f as of 2pm, with more
warming ahead.

A heat advisory (sfonpwmtr) is in effect as a result of these
temperatures thru the daylight hours of the day. Stay out of
direct sunlight, stay hydrated, listen to your body for signs of
heat exhaustion, check on vulnerable pets, plants, and populations
through the day, and never leave your child in a hot vehicle.

Also considering visiting the coastal areas today as temperatures
will be much more mild for coastal areas. If you do choose to
visit ocean coastal areas remember that the water is still very
cold!
in addition to the heat, dry gusty N NE winds will develop
through the weekend aimed primarily and the north and east bay
hills mountains. Mount diablo has already gusted to 60mph as of
445am this morning, and several other locations in the
aforementioned areas have reached 40 mph. Winds were expected to
weaken slightly during the day today (and have) but will pick up
again this evening into tomorrow morning. As a result of the heat
and dry offshore flow, relative humidity values will drop into
the upper single digits to low teens in the warmest windiest
locations by this afternoon. This means that there is a greatly
increased risk that any new fires that start will spread rapidly.

As a result, a red flag warning is in effect (sforfwmtr) for these
areas through tomorrow. Be mindful of any outdoor activities that
could ignite new fires, such as discarded hot or burning objects
from cars, lighting campfires, barbecues, or fireworks, driving
cars over dry grass, or using anything with a motor including lawn
equipment.

Satellite imagery showed the development of a southerly surge
along our coast early this morning. This is a moist cool maritime
air mass that generally jets up the coast in the back side of our
heat spikes heat waves. The arrival of this southerly surge was
not unexpected, however, it did arrive a bit sooner than any model
had indicated. The southerly surge was halted as it approached
point sur once it was no longer sheltered from the dry northerly
flow waiting for it past the lighthouse. This dry northerly flow
rapidly entrained dry air into the shallow southerly surge, drying
it out, and weakening its momentum. The msl analysis showed the
center of a weak circulation driving this surge off the coast,
which stalled and then further cut off the surge by undercutting
it with more dry around midday. That said, we are expecting the
shallow southerly surge to eventually break through the resistance
at the lighthouse and creep up the coast towards the monterey
peninsula. No significant impacts are expected to come from this
southerly surge until it deepens and pushes farther northward
tomorrow. Then and only then is it expected to bring a return
towards a maritime-dominated air mass over most of the san
francisco and monterey bay areas, with cooler temperatures and
cloudy skies near the coast. A return to near normal temperatures
are then expected through the upcoming week as weak onshore flow
redevelops under a benign quasi zonal setup.

Aviation As of 10:42 am pdt Saturday... For 18z tafs.VFR
through the period for all sites aside from low cloud development
late tonight along the monterey peninsula. Visible satellite
imagery is showing mainly clear skies across the region with the
exception of low clouds moving northward along the monterey county
coastline. It is uncertain at this time how far north these clouds
will progress. Current high resolution models do not have these
clouds intruding into the monterey TAF sites before late tonight.

Satellite will be monitored and tafs will be updated as necessary.

Onshore winds this afternoon 10 to 15 kt with gusts near 20 kt
possible around the sf peninsula. Occasional mixing down of
offshore winds aloft will also be possible.

Vicinity of ksfo...VFR. Winds becoming onshore with gusts up to
near 20 knots this afternoon and early evening. Scattered low
clouds possible starting early tomorrow morning.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR. MVFR CIGS are possible at some point
this afternoon should the low clouds moving up the monterey county
coastline reach the peninsula and intrude inland. Right now, high
resolution models suggest that the low clouds will remain
away from the terminals and retreat southward before re-surging
up the coast and finally moving in late tonight. Confidence on the
timing of this surge is low and tafs may need to be amended as
conditions change. Otherwise,VFR conditions are expected to
prevail through late tonight. Generally light winds through the
period with locally higher onshore winds at ksns this afternoon
and evening.

Fire weather As of 3:18 am pdt Saturday... A red flag warning
remains in effect for the north and east bay hills from 11 am
through 8 pm this evening. The main concern will be for hot
inland temperatures and low relative humidity along with moderate
and dry northerly winds. To be clear the weather set-up is very
different and not nearly as critical in terms of winds to the
north bay firestorm last october.

Temperatures will continue to warm this afternoon further drying
out fuels that are running near average in terms of seasonal
dryness. Even more widespread afternoon highs in the 90s and low
100s are expected. As temperatures warm, dry northerly winds will
come down the sacramento valley and spread over napa county
by late this morning with wind gusts between 35-45 mph. Winds
will ease in the afternoon before the north and east bay hills see
another round of increased north winds late this evening into
Sunday. During this time little to no relative humidity recovery
is expected and overnight lows will be warm in the 70s and 80s.

Afternoon highs on Sunday will remain warm to hot, but onshore
flow will return late in the day providing some cooling.

Those spending time outside this weekend are urged to be vigilant
with sources of ignition. Any new fire starts, especially in the
grassy fuels will spread rapidly.

Marine As of 08:18 am pdt Saturday... Gusty northerly winds
will continue into tonight as high pressure sits over the eastern
pacific and a thermal trough resides over california. These winds
will generate steep wind waves creating hazardous sea conditions,
especially for smaller vessels. Winds will subside tonight into
tomorrow as a southerly surge develops by early tomorrow morning
turning the winds southerly over the inner coastal waters.

Mtr watches warnings advisories
Tngt Heat advisory... Caz506>508-510>513-516>518 until 8 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm from 9 pm
sca... Pt reyes to pigeon pt 0-10 nm until 9 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 pm
sca... Pt reyes to pigeon pt 0-10 nm from 5 am
sca... Sf bay from 5 am
public forecast: drp
aviation: as
marine: as
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
RTYC1 - 9414523 - Redwood City, CA 8 mi41 min NNW 9.9 G 12 85°F 73°F1007.2 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi47 min W 7 G 9.9 81°F 68°F1007.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi41 min N 6 G 6
PXSC1 25 mi47 min 80°F 51°F
LNDC1 25 mi41 min N 6 G 8.9 81°F 1007 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 25 mi41 min WNW 1.9 G 4.1 75°F 1006.3 hPa
OBXC1 25 mi41 min 76°F 56°F
FTPC1 - 9414290 - San Francisco, CA 26 mi47 min WSW 14 G 19 62°F 59°F1007.8 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi41 min NW 7 G 9.9 68°F 1007.2 hPa
46237 - San Francisco Bar, CA (142) 29 mi59 min 56°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 29 mi39 min NW 14 G 18 57°F 56°F8 ft1009.6 hPa (-1.1)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 32 mi47 min SSW 6 G 9.9 68°F 1007.6 hPa
RCMC1 - 9414863 - Richmond, CA 34 mi47 min SSE 5.1 G 6 73°F 60°F1006.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi29 min WNW 14 G 16 54°F 53°F1008.7 hPa (-1.4)54°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi41 min WSW 9.9 G 12 83°F 1006 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi41 min WNW 8 G 9.9 70°F1006 hPa
PCOC1 - 9415144 - Port Chicago, CA 45 mi41 min W 1.9 G 2.9 94°F 71°F1005.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 45 mi39 min NW 14 G 18 56°F 54°F7 ft1008.6 hPa (-0.7)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 48 mi41 min WNW 8 G 8.9 91°F 1005.8 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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
12
PM
1
PM
2
PM
3
PM
4
PM
Last
24hr
NW10
N10
NW10
NW10
N5
NW3
NW5
N5
N4
--
N2
S2
E1
SW2
W2
N1
N6
N6
NW6
N3
N9
N7
N13
NW9
1 day
ago
NW11
G14
NW11
NW11
G15
NW12
NW10
NW5
NW7
NW7
NW4
NW3
NE1
S1
S1
S2
W1
E2
NW2
N4
N5
N2
N8
NW11
N11
N13
2 days
ago
NW11
G16
W12
W15
NW14
W10
NW8
W6
W6
NW3
W5
NW6
W4
W6
W7
W8
NW6
G9
E3
N5
N7
G10
N7
G11
N12
G15
N12
G16
NW14
G18
NW11
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA8 mi42 minNW 610.00 miClear93°F48°F21%1006.8 hPa
Half Moon Bay Airport, CA10 mi34 minNW 94.00 miFair with Haze63°F53°F73%1008.8 hPa
San Francisco, San Francisco International Airport, CA12 mi33 minWNW 1510.00 miFair86°F52°F31%1006.6 hPa
Palo Alto Airport, CA12 mi42 minNW 1210.00 miClear88°F57°F35%1006.4 hPa
Mountain View, Moffett Field, CA15 mi33 minNNW 810.00 miFair88°F55°F33%1006.9 hPa
Oakland, Metro Oakland International Airport, CA19 mi36 minNW 1010.00 miFair80°F55°F42%1006.9 hPa
Hayward, Hayward Air Terminal, CA19 mi35 minW 1010.00 miFair92°F57°F31%1007.4 hPa
San Jose, San Jose International Airport, CA22 mi36 minNW 1310.00 miFair97°F50°F20%1006 hPa

Wind History from SQL (wind in knots)
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
12
PM
1
PM
2
PM
3
PM
4
PM
Last 24hrN8W10W7NW8NW8NW5NW4NW4NW4CalmCalmCalmS3CalmCalmCalm4N5NW5N5NW5N7N9NW6
1 day agoNW7NW12NW12NW8NW10NW7NW5NW6NW9NW4CalmCalmCalmCalmCalmCalm344NE5N7NW8N8NW8
2 days agoW12W12W11
G17
W11W8W9W7W5W3CalmNW3NW5W3W5W6W6Calm3N8--W7NW9N11N7

Tide / Current Tables for Smith Slough, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Smith Slough
Click for Map
Sat -- 03:02 AM PDT     Moonset
Sat -- 05:12 AM PDT     0.42 feet Low Tide
Sat -- 05:48 AM PDT     Sunrise
Sat -- 10:58 AM PDT     6.16 feet High Tide
Sat -- 04:33 PM PDT     Moonrise
Sat -- 04:35 PM PDT     1.74 feet Low Tide
Sat -- 08:33 PM PDT     Sunset
Sat -- 10:33 PM PDT     8.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.653.31.80.80.40.71.73.14.65.76.25.84.93.72.61.91.82.63.95.578.18.2

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
San Mateo Bridge
Click for Map
Sat -- 01:59 AM PDT     -1.50 knots Max Ebb
Sat -- 03:02 AM PDT     Moonset
Sat -- 05:17 AM PDT     0.01 knots Slack
Sat -- 05:48 AM PDT     Sunrise
Sat -- 08:13 AM PDT     1.50 knots Max Flood
Sat -- 11:19 AM PDT     -0.01 knots Slack
Sat -- 02:22 PM PDT     -0.89 knots Max Ebb
Sat -- 04:33 PM PDT     Moonrise
Sat -- 05:05 PM PDT     0.00 knots Slack
Sat -- 07:59 PM PDT     1.44 knots Max Flood
Sat -- 08:34 PM PDT     Sunset
Sat -- 11:03 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.1-1.4-1.5-1.4-1-0.20.61.21.51.410.2-0.4-0.7-0.9-0.9-0.6-0.10.71.31.41.30.80

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 (19,4,5,8)
      (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.