Marine Weather and Tides
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 6:26AM||Sunset 7:56PM||Thursday August 17, 2017 8:18 AM PDT (15:18 UTC)||Moonrise 1:18AM||Moonset 3:46PM||Illumination 22%|
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|PZZ576 Point Pinos To Point Piedreas Blancas 10 To 60 Nm Offshore- 253 Am Pdt Thu Aug 17 2017 |
Today..SW winds 5 kt. Wind waves 2 ft or less. Mixed swell nw 5 to 6 ft at 11 seconds and S 3 ft at 17 seconds. Patchy fog in the morning.
Tonight..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 5 to 6 ft at 12 seconds and S 3 ft at 15 seconds. Patchy fog after midnight.
Fri..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 5 to 6 ft at 12 seconds and S 3 ft at 16 seconds. Patchy fog in the morning.
Fri night..NW winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 5 ft at 12 seconds and S 3 ft at 15 seconds. Patchy fog after midnight.
Sat..NW winds 10 kt...increasing to 10 to 20 kt. Wind waves 3 to 5 ft. Mixed swell nw 4 to 6 ft at 11 seconds and S 3 ft at 15 seconds. Patchy night and morning fog.
Sun..SW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 6 to 8 ft. SWell S 3 ft. Patchy fog.
Mon..W winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft. Patchy fog.
|PZZ500 253 Am Pdt Thu Aug 17 2017 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light variable winds through the day as an east pacific ridge builds inland to the north while a weak trough lingers just to the south. Expect increasing northwest winds beginning late tomorrow and lasting through the weekend as the ridge strengthens further.
7 Day Forecast for Marine Location Near Carmel-by-the-Sea, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 171150|
area forecast discussion
national weather service san francisco bay area
450 am pdt Thu aug 17 2017
Synopsis A gradual inland warming trend can be expected through
late week as high pressure builds over the region. Overnight and
morning clouds will also be common, especially near the coast and in
the adjacent valleys.
Discussion As of 4:14 am pdt Thursday... Skies are clear thus far
over most of napa county, parts of the east bay and south bay, san
benito and interior monterey counties while stratus and fog blanket
the bays and the rest of the coast early this morning. The marine
layer depth is holding steady at 2,000 feet.
The marine inversion is fairly well developed and further strengthening
occurs today into Saturday as increasing subsidence in advance of a
594 decameter closed mid-upper level high centered approx 700 miles
west of the bay area produces large scale sinking and adiabatic warming.
Thermal ridging coincides with geopotential height ridging over norcal
today into at least the first part of the weekend, and per most recent
nam model output warming becomes focused over inland valleys and hills
especially over the bay area counties, and in particular over the north
bay Friday and Saturday. 925 mb level temperatures reach 28c over
north bay tonight and then 30c Friday night meaning temperatures in
the north bay hills and mountains will most likely hover in the
lower to middle 80s all night as the marine layer becomes
increasingly squashed under high pressure. With this in mind, am not
having a whole lot of confidence in daytime maximum temperature
guidance especially for north bay and east bay areas Friday and
Saturday; 90s to near 100 will probably be more common even closer
to the bays as the marine layer becomes increasingly compressed.
Eventually an active mid latitude zonal jet stream crossing the
lower 48 buckles ever so slightly causing a weak and slowly sw
moving upper level trough to form over the west coast and east
pacific by late this weekend into early next week. Model output has
been consistent with showing lower to mid level thermal ridging
weakening over the forecast area while this trough develops, however
with a solidly strong position to start there'll still be remnants
of it to persisting causing the marine layer to persist Sunday into
Monday. At the same time much drier 925 mb rhs sweep in from the
northwest over the weekend probably mixing into the marine based
clouds with a tendency for lower level winds, and possibly surface
winds to go from onshore to having a weak southerly component. The|
question is how will all of this influence the marine layer early
next week? It's just a guess that there could be an earlier than
usual clearing Monday morning.
For mid-late next week, a very deep low pressure area develops over
the gulf of alaska. The ecmwf, gfs, gem have been lean toward weak
long-wave troughing over the west coast. The southern extent of the
gulf of alaska low arrives as a trough bringing more pronounced
cooling and increasing onshore winds. Coastal drizzle is a possibility
in a deepening or even possibly a fully mixed out marine layer.
Aviation As of 4:50 am pdt Thursday... Building east pacific
basin ridge continues to compress marine layer this morning. Fort
ord profiler shows a top of approximately 1800 feet with a base
around 800 feet, while the cloud thickness satellite imagery is
estimated to be around 1000 feet. Latest goesr nighttime
microphysics imagery shows the stratus deck rapidly expanding
across the san francisco and monterey bay areas early this
morning. Expect to see these clouds continue to thicken up and
expand through dawn before quickly mixing out between 16-17z.
Marine layer will continue to compress tonight with slightly lower
cigs and less thickness overall. Light winds today, increasing
Vicinity of ksfo... MVFR CIGS through sunrise, then dissipating
between 15-16z. Light northerly morning winds shifting to become
breezy and out of the west by the afternoon.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals... MVFR CIGS through 17-18z. Ifr cigs
possible tonight beginning as early as 02-03z.
Marine As of 04:43 am pdt Thursday... Light variable winds
through the day as an east pacific ridge builds inland to the
north while a weak trough lingers just to the south. Expect
increasing northwest winds beginning late tomorrow and lasting
through the weekend as the ridge strengthens further.
Mtr watches warnings advisories
Tday Sca... Sf bay from 1 pm
public forecast: canepa
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|46239 - Point Sur, CA (157)||99 mi||57 min||60°F||7 ft|
|46028 - CAPE SAN MARTIN - 55NM West Northwest of Morro Bay, CA||99 mi||89 min||Calm G 1.9||61°F||61°F||6 ft||1015.9 hPa (+0.7)|
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Monterey Regional Airport, CA||120 mi||25 min||N 0||10.00 mi||Overcast||61°F||55°F||84%||1017.7 hPa|
Wind History from MRY (wind in knots)
|1 day ago||S||SW||SW||W||W||W||SW||SW||SW||W||SW||SW||W||SW||W||W||W||W||W||Calm||S||S||S|
|2 days ago||SW||W||W||W||SW||W||W||W||W||W||SW||W||SW||SW||W||SW||SW||SW||SW||SW||S||S||SW||S |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help
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Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of CentralWestCoast EDIT
Wind Forecast for San Francisco/Monterey Bay Area, CA (11,2,3,4)(on/off)  Help
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