Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Yreka, CA

Version 3.4
What's New / NOTES
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 6:20AMSunset 8:08PM Thursday August 17, 2017 8:16 AM PDT (15:16 UTC) Moonrise 12:58AMMoonset 3:56PM Illumination 22% Phase: Waning Crescent; Moon at 25 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 206 Am Pdt Thu Aug 17 2017
Synopsis for the southern oregon coastal waters..High pressure centered offshore and a thermal trough along the coast will continue moderate to strong north winds with steep to very steep seas through the weekend. Conditions will at least be hazardous to small craft, but warning level winds and seas will occur beyond 5 nm from shore and south of gold beach through the period.

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 171101
afdmfr
area forecast discussion
national weather service medford or
401 am pdt Thu aug 17 2017

Short term A high pressure ridge over the region with a surface
thermal trough along the coast will persist into Friday. This will
bring dry and warm conditions with periods of gusty winds along
the coast and into the coastal mountains. On Saturday, a
shortwave disturbance will move towards the northern california
coast then shift southward along the california coast on Sunday.

This will result in a slight chance for thunderstorms over
southeast portions of the area Sunday and Monday. Smoke will
remain a concern into next week. Little change is expected in the
areas getting smoke impacts today into this weekend and will see
similar smoke levels with some fluctuations each day.

Today, expect warm and dry conditions across the area. High
temperatures will rise into the upper 90s in western valleys and
in the upper 80s in eastern valleys. Dry offshore, easterly winds
are bringing breezy to gusty conditions over the coastal
mountains. Also the easterly winds are bringing a chetco effect to
the brookings area with highs expected in the 90s today. Along the
coast, gusty north winds will develop in the afternoon into the
evening.

On Friday, the upper ridge remains in place but flattens due to a
trough moving inland well to north. Expect little change in the
weather pattern compared to today. So the area will see another
day of very warm temperatures across inland areas and dry weather.

For the weekend, models continue to show a shortwave trough
approaching the coast on Saturday then shifting southward along
the california coast Saturday night into Sunday and developing
into a closed low. Southerly moisture is expected to move up from
the sierras around into southeast portions of the area. This
combined with weak instability and and weak disturbances will
bring a slight chance for thunderstorms to modoc and southeast
lake counties late Sunday afternoon and evening. Otherwise expect
continued warm temperatures over the area. The surface thermal
trough will linger along the coast and bring periods of gusty
winds to coastal areas.

Monday into Tuesday, the upper low is forecast to remain off the
south-central california coast and mid level moisture will move
up into the area from the south. Models are continuing to show a
slight chance of thunderstorms over portions of siskiyou, modoc
and southeast lake counties on Monday. The forcing and instability
remain weak and there is variability in the track and strength of
the low. So confidence is low in the details for Monday. By
Tuesday, there is increasing confidence for isolated thunderstorms
developing a over portions of northern california and from the
cascades east.

Aviation 17 06z TAF cycle...VFR will prevail across the area
through Thursday with the two exceptions of ifr stratus returning to
the coast north of CAPE blanco between about 09z this evening and
16z Thursday morning, and wildfire smoke degrading visibility. This
smoke is beginning to affect most areas in the forecast area except
for the coast and lake county. Also, at the coast and offshore,
gusty north winds will be strongest south of CAPE blanco and during
the afternoon and evening hours. -dw sk

Marine Updated 230 pm pdt Wednesday 16 august 2017... Confidence
has increased that high pressure centered offshore and a thermal
trough along the coast will continue moderate to strong north winds
and steep to very steep seas through the weekend. Conditions will at
least be hazardous to small craft, but warning level winds seas will
occur beyond 5 nm from shore and south of gold beach through the
period. Winds and seas will be highest during the afternoons and
evenings each day through Sunday, easing a bit during the overnights
and early mornings. Model guidance shows peak boundary layer winds
of ~50kt on both Saturday and Sunday afternoons, then the pressure
gradient weakens with winds gradually easing early next week.

-spilde dw

Fire weather Updated 330 am Thursday 17 august 2017...

a thermal trough along the coast will maintain moderate northeast
offshore winds in the SW oregon coast range and portions of western
siskiyou county this morning. Humidity recoveries in these areas
have been poor to moderate, generally 35-45 percent at mid
slope ridge level, with wind speeds peaking at 10-15 mph. Occasional
gusts of 25-30 mph have been reported at a couple of the more
exposed raws like red mound and slater butte overnight.

It will remain very dry over much of the area today through the
weekend with daily minimum relative humidity in the 10-20% range
south of the umpqua divide and also east of the cascades. Nighttime
and early morning marine layer clouds will be confined to the
immediate coast north of CAPE blanco. Today will be very warm and
dry even on the southwest coast - a brookings effect is in full
force with the current temperature as of 3 am sitting at 81f.

Guidance indicates a high temperature there similar to yesterday, in
the low 90s with corresponding minrh in the upper 20s to near 30
percent. Expect some marine influence to raise minrh values a bit
there over the coming days, but it will remain lower than usual.

High pressure aloft will flatten across the area today through
Friday allowing the atmosphere to become more unstable. High level
haines of 5 will be common west of the cascades today, then across
the entire area on Friday. Haines 6 is possible in portions
of fire zones 624 western 625 on Friday. Temperatures inland
will be back to 5-10 degrees above normal.

An offshore upper level disturbance will dig southeastward this
weekend and close off near the central southern california coast
early next week. It's still uncertain, but this may be able to
bring some moisture back to the north up the sierra crest and
eventually into portions of our forecast area. We are continuing to
indicate a slight chance of thunderstorms in modoc on Sunday
afternoon, then near the trinity alps medicine lake area into modoc
and perhaps goosenest area Monday afternoon. Models have come into
better alignment showing a better chance for lightning from the
cascades siskiyous eastward on Tuesday afternoon evening. -spilde

Mfr watches warnings advisories
Or... None.

Ca... None.

Pacific coastal waters... Small craft advisory until 11 pm pdt Sunday for
pzz350-356-370-376.

Gale warning until 11 pm pdt Sunday for pzz356-376.

Cc


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 82 mi46 min Calm G 1.9 58°F 60°F1015.7 hPa
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 93 mi86 min N 19 G 23 55°F 52°F8 ft1014.5 hPa (+0.6)

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Montague Siskiyou County Airport, CA9 mi23 minN 07.00 miFair61°F45°F56%1020.7 hPa

Wind History from SIY (wind in knots)
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Last 24hrCalmCalmCalmN3Calm6N8NW11
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1 day agoNE4------33NE5N9
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2 days agoN5NW4E4CalmCalm--N5CalmN11
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Tide / Current Tables for Crescent City, California
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Crescent City
Click for Map
Thu -- 02:04 AM PDT     Moonrise
Thu -- 02:34 AM PDT     0.06 feet Low Tide
Thu -- 06:27 AM PDT     Sunrise
Thu -- 09:09 AM PDT     5.13 feet High Tide
Thu -- 02:09 PM PDT     2.83 feet Low Tide
Thu -- 05:02 PM PDT     Moonset
Thu -- 08:13 PM PDT     Sunset
Thu -- 08:23 PM PDT     7.34 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
20.80.20.10.71.72.944.85.154.43.73.12.833.64.75.86.87.37.26.55.1

Tide / Current Tables for Brookings, Chetco Cove, Oregon
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Brookings
Click for Map
Thu -- 02:04 AM PDT     Moonrise
Thu -- 02:38 AM PDT     0.06 feet Low Tide
Thu -- 06:27 AM PDT     Sunrise
Thu -- 09:10 AM PDT     5.13 feet High Tide
Thu -- 02:13 PM PDT     2.83 feet Low Tide
Thu -- 05:03 PM PDT     Moonset
Thu -- 08:14 PM PDT     Sunset
Thu -- 08:24 PM PDT     7.34 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.10.90.20.10.61.62.844.85.154.53.83.22.833.64.65.76.77.37.26.55.2

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 (11,2,3,4)
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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.