Sunday, June24, 2018

Marine Weather and Tides
Point Arena, 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 5:48AMSunset 8:36PM Sunday June 24, 2018 9:32 AM PDT (16:32 UTC) Moonrise 4:48PMMoonset 2:53AM Illumination 86% Phase: Waxing Gibbous; Moon at 11 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

7 Day Forecast for Marine Location Near Point Arena, CA
   Hourly   EDIT   Help
location: 36.95, -126.32     debug

Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 241524
area forecast discussion
national weather service san francisco bay area
824 am pdt Sun jun 24 2018

Synopsis A cooling trend will continue to take hold of the bay
area today into Monday. The red flag warning remains in effect for
the north and east bay hills today. The pattern will return to a
more seasonable or cooler set up for the work week.

Discussion As of 08:24 am pdt Sunday... The southerly surge
that raced up the coast yesterday brought widespread clouds along
the coast and locally inland, especially down the salinas valley.

Fort ord profiler shows the marine layer of just a few hundred
yesterday to near 2,000 feet this morning. There have also been a
few reports of patchy fog with drizzle this morning. Latest
satellite trends on visible imagery does show some thinning on the
edges of the marine layer, but doe expect clouds to lingering
along the coast for much of the day. Given the southerly flow it's
totally possible that monterey clears out and santa cruz
struggles to see the Sun today.

The bigger story today, as noted on the previous discussion, will
be the widespread cool down. Still looking for a 10 to 20 degree
cool down across the interior. Despite the cool down temperatures
across the interior will be still be a few degrees above normal
with highs in the 80s and 90s. Far interior of napa, monterey and
san benito counties may see a few pockets of 100 deg.

No update is planned at this time.

Prev discussion As of 04:00 am pdt Sunday... The story for today,
Sunday, is a noticeable cool down across the bay area and
monterey bay regions. This is a result of the upper ridge axis
shifting to the east with an upper trough pushing in from the
west. A surge of winds from the south with low clouds and fog
began moving in yesterday evening as the ridge shifted while the
upper low is helping to pull the surge northward. As the upper low
moves closer to the coast the low clouds will deepen causing
deeper inland penetration under the influence of a strong onshore
push. In areas where the surge has already reached, temperatures
are 10 to 20 degrees lower than 24 hours ago with winds from the
south at 10 to 20 mph. This surging marine layer is deepening as
well, causing cooling temps inland by about 5 degrees. The lone
hold outs of warmer temps are the highest sites in the hills which
are still holding on to the 70s and 80s.

The forecast for the rest of the day is onshore flow and cooling.

Some areas will see a 10 to 20 degree cool down from the high
temps of Saturday. Inland regions will remain hot today before the
onshore flow really takes hold. Temps into the 90s will persist
and near 100 in portions of north and east bay, as well as parts
of san benito county. Offshore winds in the mountains and hills
will turn onshore through the day. In short, look for much cooler
temps than yesterday under the influence of onshore flow.

Several upper troughs will clip the region from the north through
the remainder of the week, keeping a cap on temps. At this time
it looks like the area will be seasonable or below normal through
the week. These troughs will maintain a deep marine layer each

Aviation As of 4:43 am pdt Sunday... Southerly stratus surge
has advanced up past the mendocino sonoma county border, and is
already pushing through the san francisco bay into the delta as
well. Stratus has also filled into the salinas valley and into
san benito county. The marine layer depth is 2000 feet deep per
the fort ord profiler, and the sfo-sac surface pressure gradient
is up to 3.3 mb. Ceilings at mry and sns will be slow to clear
today, and look for bay area terminals to sock in overnight
tonight. Gusty westerly northwesterly winds are expected through
this evening.

Vicinity of ksfo... Should remainVFR today but confidence is low.

Northwest winds will pick up this afternoon with gusts to 22
knots. Ifr CIGS developing by 08z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS through the morning. Look for
MVFR CIGS in the afternoon with gusty northwest winds to 20 knots.

Ifr CIGS again by 06z.

Fire weather As of 4:00 am pdt Sunday... Red flag warning
remains intact for the time being. Onshore flow, cooling temps,
and rising humidity will continue to develop through the day. That
said, overnight recoveries have been modest at best with rhs at
elevation in the 20-30% range. Valley to midslope recoveries have
been much better overnight, reaching into the 60-70% range. Winds
at elevation remain breezy this morning with diablo the big winner
at around 30 mph from the nnw. The red flag warning will need to
be reevaluated later this morning to determine how deep the marine
layer is developing. This may truncate the warning and allow it to
be cancelled early.

With the ongoing fire activity around the state and conditions
slowly changing will leave the red flag warning out for now.

Marine As of 03:11 am pdt Sunday... High pressure over the
eastern pacific and a thermal trough over inland california will
keep gusty northerly winds across the northern coastal waters
through today. 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.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Sf bay
public forecast: mm
aviation: sims
marine: sims
fire weather: rww
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
Click EDIT to select an airport
Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (12,3,4,5)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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 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 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.