Thursday, September21, 2017

Marine Weather and Tides
Chiloquin, OR

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 6:53AMSunset 7:05PM Thursday September 21, 2017 2:23 PM PDT (21:23 UTC) Moonrise 7:20AMMoonset 7:15PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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7 Day Forecast for Marine Location Near Chiloquin, OR
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location: 42.73, -121.98     debug

Area Discussion for - Medford, OR
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Fxus66 kmfr 211746
area forecast discussion
national weather service medford or
1045 am pdt Thu sep 21 2017
updated aviation section

Discussion The axis of the upper trough has shifted east of
our area and it will be much more quiet day compared to yesterday
in terms of shower activity. A few isolated showers are expected,
but most will be over the higher terrain and northwest facing
slopes due to upslope flow. Even then precipitation amounts will
be very light in these areas.

Some clearing took place and this allowed temperatures to cool
down. Also patchy fog developed early this morning in portions of
the rogue and illinois valley. Road snow accumulations were
confined to the higher elevations near and at crater lake rim and
crater lake entrance. A trace of slush was at diamond lake and
dead indian memorial summit, but roads were wet in these areas.

Another cold night is expected east ofthe cascades with
temperatures likely dropping near or below freezing. Some westside
locations will have chilly temperatures and some of the typical
cool spots could dip into the upper 30s late tonight into Friday
morning. Probably not cold enough to warrant a frost advisory, but
we'll take a closer look at this. -petrucelli

Aviation 21 18z TAF cycle...VFR will prevail the rest of today.

However, partial terrain obscurations will persist and local MVFR is
possible in heavier showers. Showers will be more hit-or-miss though
compared to the last few days. Ifr MVFR ceilings and visibilities
will redevelop in most west side valleys overnight into Friday
morning as well as at the coast, mainly from CAPE blanco northward.

Other than patchy fog,VFR will prevail elsewhere tonight into
Friday morning. -spilde

Marine Updated 330 am pdt Thursday, 21 september 2017...

steep northwest swell hazardous to small craft will briefly continue
this morning with seas hovering near 10 feet, mainly beyond 10
nautical miles of the coast. Seas will then briefly subside below
small craft advisory level to around 8 feet this afternoon before
returning this evening for areas well offshore. Winds will be light
today as weak low pressure drifts southward through the coastal
waters bringing with it more showers. Friday afternoon and evening
north winds and seas will begin to build with small craft advisory
level conditions expected for much of the area south of CAPE blanco
by evening. This will begin a prolonged period of northerlies that
will maximize in strength each afternoon and evening as thermal
troughing returns and persists. Btl

Prev discussion issued 635 am pdt Thu sep 21 2017
discussion... An upper level trough centered over the region will
continue to bring much cooler than normal temperatures across the
area today. Additionally, a weak low, just off the coast, is
moving down the backside of the trough and will bring increased
showers to the area this morning into this afternoon. Showers will
decrease in coverage tonight. On Friday, some lingering light
showers are possible as the upper trough remains over the area,
gradually moving eastward. These lingering showers are expected
mainly in the southern oregon cascades and in the mountains east
of the cascades on Friday. An upper ridge to the west will then
move over the area beginning Saturday. This will bring dry and
warmer weather on Saturday.

Mainly scattered to isolated showers are expected today with snow
levels around 4500 to 5000 feet this morning, rising to 5500 to
6000 feet during the afternoon. Snow showers are expected to be
light and bring little or no additional snow accumulations today.

Shower activity will decrease tonight as the upper trough axis
gradually shifts east of the area. With the upper trough still in
the vicinity, lingering light showers are possible through Friday,
mainly in the southern oregon cascades and across portions of the
east side. Otherwise, expect warming temperatures on Friday with
afternoon high expected in the upper 60s to low 70s for western
valleys. However, due to cold air lingering east of the cascades,
expect high temperatures to only reach the upper 50s for eastern
valleys on Friday.

With the cold air mass remaining in place through at least Friday,
freezing or near freezing temperatures will occur during the late
night and early morning hours over areas east of the cascades in
klamath, lake, eastern siskiyou and modoc counties. Freeze
warnings and frost advisories are in effect this morning and again
late tonight and Friday morning for these areas. Please see the
npwmfr for details.

Beginning Saturday, an upper level ridge will begin to nudge
inland into the region. However, expect another cold start to the
day, especially east of the cascades, with low temperatures near
or below freezing once again in eastern locations. Dry weather is
expected across the area on Saturday and afternoon temperatures
are expected to be closer to normal for this time of year in
valleys west of the cascades with highs in the mid 70s. Continued
cool temperatures are expected east of the cascades though on
Saturday with high temperatures only warming into the mid 60s for
east side valleys.

The ridge will strengthen and remain in place through Thursday. As
a result expect temperatures to rise to near normal or slightly
above normal Sunday into next week with no precipitation. By
next Friday, models indicate that the pattern may change with
another trough moving towards the pacific northwest.

Fire weather... Updated 630 am pdt thu, 21 september 2017... .

An unusually cold upper level trough will remain over the forecast
area today through Friday with a general north wind flow across the
area. Isolated to scattered showers along with substantial cloud
cover is expected, mainly in northwest flow upslope areas during the
afternoon and evening hours. Altogether, the general northerly flow
is a fairly dry one for our forecast area, so precipitation amounts
today are expected to be pretty light, mainly less than a tenth of
an inch. Guidance is also showing the mid-levels to be dry enough
today to keep precipitation amounts light.

High pressure will begin to build in more assertively from the west
tonight through Friday, resulting in a drying and warming trend. A
thermal trough will develop along and near the coast Friday,
persisting through early next week. This will result in east winds
each night and morning, and warm temperatures all the way to the
coast each afternoon. Temperatures are expected to be 5 to 10
degrees above normal next week. Afternoon humidity will likely lower
into the 20s and 30s across the forecast area. With the recent
rainfall, models may be somewhat overdoing the amount of drying, at
least initially, so, for this weekend we've leaned toward the
consensus guidance rather than seeking the drier solutions (as we
were doing prior to the significant rainfall).

Cpc's 8-14 day outlook as well as weeks 2-4 on the cfsv2 continue to
indicate enhanced probabilities for above normal temperatures and
below normal precipitation. So, a steady and long-duration warm and
dry period is expected, albeit tempered by the declining Sun angle
associated with the changing of the seasons. Btl spilde

Mfr watches warnings advisories
Or... Frost advisory from 2 am to 9 am pdt Friday for orz029>031.

Freeze warning from 2 am to 9 am pdt Friday for orz029>031.

Ca... Frost advisory from 2 am to 9 am pdt Friday for caz084-085.

Freeze warning from 2 am to 9 am pdt Friday for caz084-085.

Pacific coastal waters... Small craft advisory for hazardous seas
until 11 am pdt Friday for pzz370-376.

Mas map btl cc

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Klamath Falls International Airport, OR42 mi31 minVar 410.00 miPartly Cloudy51°F24°F35%1011.5 hPa

Wind History from LMT (wind in knots)
Last 24hrW13
1 day agoW12W11
2 days agoNW20

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Medford, OR (17,4,5,8)
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Ground Weather Radar Station Medford, OR
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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.