Sunday, May28, 2017 L-36.com


Marine Weather and Tides
Yreka, 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 5:36AMSunset 8:39PM Sunday May 28, 2017 1:41 AM PDT (08:41 UTC) Moonrise 7:49AMMoonset 10:43PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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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This is a Weather Statement Zone, please check the Date to see if it has expired
PZZ330 1126 Pm Pdt Fri Aug 9 2013
.thunderstorms over the waters... Thunderstorms over the waters have weakened but isolated storms will continue overnight. Mariners can expect gusty and erratic winds with the storms along with frequent lightning. If caught on the open water stay below deck if possible...keep away from ungrounded metal objects. Lat...lon 4397 12411 4396 12411 4400 12413 4284 12455 4242 12440 4225 12441 4205 12428 4184 12422 4181 12580 4198 12579 4220 12589 4370 12576 4386 12565 4399 12562 4403 12414
PZZ300 830 Pm Pdt Sat May 27 2017
Synopsis for the southern oregon coastal waters..Fog and low stratus will persist with light and variable winds through the rest of this weekend. A thermal trough will redevelop Sunday with increasing north winds into Monday, then will weaken again Tuesday. A series of weak disturbances will keep generally light, variable winds and slight seas over the area Wednesday and Thursday before the thermal trough returns late next week or next weekend.

7 Day Forecast for Marine Location Near Yreka, CA
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location: 41.75, -122.64     debug


Area Discussion for - Medford, OR
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Fxus66 kmfr 280300
afdmfr
area forecast discussion
national weather service medford or
800 pm pdt Sat may 27 2017

Discussion 28 00z NAM in.

Mostly clear skies prevail across the medford CWA with the exception
of the coast and the adjacent coastal waters... Where low marine
stratus dominates. This stratus will progress inland tonight into
Sunday morning... Covering part of the umpqua basin in the late
night to mid-morning hours.

The clear skies over most of the area come courtesy of a strong
long wave ridge that is now moving onshore. This is bringing dry
northerly flow aloft to the area. This ridge will move slowly
east... Breaking to the east of the area Sunday afternoon into
Sunday evening.

Dry and warm weather will prevail into Sunday afternoon. Sunday
highs will be around 5 degrees below normal along the coast due to
persistent marine layer low clouds... Around 10 degrees above
normal in the umpqua basin due to morning marine layer clouds...

and near 15 degrees above normal over the rest of the area.

As the long wave ridge axis breaks to the east of the area, the
flow aloft will become southerly and this will open the door to
monsoonal moisture advecting into the area. Thus, thunderstorms
become a possibility as early as Sunday afternoon. However, the
moisture will still be very limited at that time (pws around 0.5
inches over the unstable areas), so the chances of thunderstorm
development is quite low.

Southerly flow aloft will gradually increase into Monday, and
conditions will become much more favorable for thunderstorm
development. Difluence aloft, increasing 700 mb south to
southeast flow (10-15 kts) due to an approaching slightly
negatively tilted upper level trough, increasing moisture (pws
increasing to 0.75 to around 1.10 inches), and increasing
instability will combine to support showers and thunderstorms
across much of the area. The models continue to indicate a dry
slot near mt shasta city Monday afternoon but otherwise
thunderstorms are possible across siskiyou county into western
modoc county, and from the illinois valley east and northeastward
across southwest and south central oregon. One or two of these
storms could become severe.

As far as temperatures go... Monday highs will be a few degrees
cooler over the west side... And about the same as the Sunday
highs over the east side and northern california.

A short wave ejected from an offshore long wave trough and an
associated cold front will move through the area Tuesday. This
will bring in much cooler air and a slight chance to chance of
showers and thunderstorms. Unlike Monday, a majority of the
precipitation will be in the form of showers rather than
thunderstorms. The highest instability is likely to be in northern
klamath and northwest lake counties northward toward bend.

Tuesday highs will be similar to the Monday highs along the
coast... But around 10 degrees cooler over the inland west side and
around 5 degrees cooler east of the cascades.

Long term discussion from the Saturday afternoon afd... Wednesday
through Saturday. The GFS depiction of a closed low forming
offshore of the southern oregon coast and moving south into
southern california yesterday now has an open upper level trough
that is very close to what the ECMWF showed yesterday, and today.

The GFS is deeper than the ec but expect that it will come more in
line with subsequent runs. This open upper level trough solution
brings winds to the west more quickly and pushes the unstable air
mass to the east side on Wednesday afternoon. Southerly flow
returns quickly Wednesday evening returning a feed of moist
unstable air and bringing a slight chance of thunderstorms to the
cascade crest mt. Shasta region eastward Thursday afternoon into
the evening. With the weak upper level trough pattern remaining in
place another weak front brings showers into the region Friday,
but in a northwesterly flow that is more stable and no
thunderstorms are expected. The upper trough shifts eastward
Saturday, with drying and warming as offshore flow develops and a
thermal trough returns at the coast. -sven

Aviation 28 00z TAF cycle... Along the coast and over the coastal
waters... MVFR CIGS with areas of ifr CIGS vsbys will prevail over
the next 24 hours. Patchy drizzle is possible as well.VFR will
prevail elsewhere, except MVFR ifr ceilings fog will spread into the
coastal valleys, with MVFR ceilings expected after 09z in krbg.

The low stratus should erode back toward the immediate coast after
18z Sunday. -spilde

Marine Updated 800 pm Saturday 27 may 2017... The marine layer
will remain quite deep over the coastal waters the rest of this
weekend resulting in widespread stratus and fog that could reduce
visibility to less than a half of a mile at times. Drizzle is also
possible. Winds and seas, however, will remain light.

A thermal trough will redevelop Sunday and north winds will
increase. They will peak (likely below small craft advisory levels)
on Monday.

Models have really backed off on the strength of the thermal
trough idea during the middle part of the coming week. They are
now showing a disturbance moving onshore Tuesday... Which would
allow the thermal trough to weaken again. Additional weak
disturbances will keep generally light, variable winds and low
seas over the area Wednesday Thursday and perhaps even into
Friday. At this point it looks like the thermal trough will
eventually return late in the week or next weekend.

Mfr watches warnings advisories
Or... None.

Ca... None.

Pacific coastal waters... None.

15 15 15


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 82 mi42 min SW 5.1 G 7 52°F 52°F1021 hPa (+0.0)
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 93 mi52 min SSW 3.9 G 5.8 51°F 50°F5 ft1020.4 hPa (+0.0)

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Montague Siskiyou County Airport, CA9 mi49 minN 010.00 miFair56°F44°F65%1018.1 hPa

Wind History from SIY (wind in knots)
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Last 24hrS3CalmNE5NE5CalmCalmCalm4CalmCalmCalmSW7NW75W5CalmCalmSW4CalmNE7N4E34Calm
1 day agoCalmSE3NE4CalmN5CalmCalmCalmCalmW4CalmCalm6544CalmS4CalmN6S4SW4CalmCalm
2 days agoN43NE4N3NE3CalmNE5Calm3CalmCalmN3343N18NE18
G25
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Tide / Current Tables for Crescent City, California
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Crescent City
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Sun -- 01:28 AM PDT     7.82 feet High Tide
Sun -- 05:46 AM PDT     Sunrise
Sun -- 08:29 AM PDT     -2.06 feet Low Tide
Sun -- 08:55 AM PDT     Moonrise
Sun -- 03:12 PM PDT     6.12 feet High Tide
Sun -- 08:28 PM PDT     2.29 feet Low Tide
Sun -- 08:42 PM PDT     Sunset
Sun -- 11:49 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.97.77.76.85.12.90.7-1-1.9-1.9-10.62.54.35.66.15.95.1432.42.43.14.2

Tide / Current Tables for Brookings, Chetco Cove, Oregon
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Brookings
Click for Map
Sun -- 01:29 AM PDT     7.82 feet High Tide
Sun -- 05:45 AM PDT     Sunrise
Sun -- 08:33 AM PDT     -2.06 feet Low Tide
Sun -- 08:54 AM PDT     Moonrise
Sun -- 03:13 PM PDT     6.12 feet High Tide
Sun -- 08:32 PM PDT     2.29 feet Low Tide
Sun -- 08:43 PM PDT     Sunset
Sun -- 11:50 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.97.77.76.85.130.8-0.9-1.9-2-1.10.52.44.25.56.15.95.1432.42.434.2

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Medford, OR (4,6,7,8)
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Ground Weather Radar Station Medford, OR
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weather_mapweather_map weather_map

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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.