Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
Springdale, UT

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 7:44AMSunset 5:43PM Tuesday January 16, 2018 12:15 PM MST (19:15 UTC) Moonrise 7:22AMMoonset 5:35PM Illumination 0% Phase: New Moon; Moon at 29 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 Springdale, UT
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location: 37.24, -112.98     debug


Area Discussion for - Salt Lake City, UT
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Fxus65 kslc 161637
afdslc
area forecast discussion
national weather service salt lake city ut
937 am mst Tue jan 16 2018

Synopsis High pressure will remain over the great basin into
tomorrow. A weak system will move through the high late today
through tonight bringing some clouds. The high then gives way to
a warm southwest flow on Thursday. A strong cold front will cross
utah Friday through Friday night with a cold upper trough
remaining over the area Saturday.

Discussion
Water vapor satellite shows an amplified ridge over the interior
west. 400-200mb mdcars wind observations place a 120-140kt
cyclonic jet off the pacific northwest coast. GOES slc 12z
raob hrrr indicate that precipitable water values vary from
0.05"-0.15" mountains to 0.25-0.35" western valleys.

Surface ridge has moved to our east with the amplified mid level
ridge overhead. 12z kslc RAOB shows several inversions below
700mb though gusty canyon winds owing to the easterly 10mb
pressure gradient helping to mix around the haze. Expecting the
west to increase from partly cloudy this morning to cloudy this
afternoon with the ridge axis shifting east. Removed all pops from
out west this afternoon given the rather dry mid level conditions
and decaying wave approaching from the west. Rest of the forecast
in great shape.

Previous discussion
The mid level ridge is overhead early this morning, weakening and
shifting east as a short wave trof crosses ca and starts to move
into the great basin.

The easterly gradient across the CWA remains tight enough to
generate east winds at the surface early this morning with gusts
out of the canyons along the wasatch front from the cache valley
south to utah valley. Speeds maxed out in the low 40s earlier in
the night with low 30s now. Expect the gradient to relax thru the
morning with the winds diminishing.

The approaching short wave tro around the haze. Expecting the
west to increase from partly cloudy this morning to cloudy this
afternoon with the ridge axis shifting east. Removed all pops from
out west this afternoon given the rather dry mid level conditions
and decaying wave approaching from the west. Rest of the forecast
in great shape.F weakens considerably as it shifts
east across nv today and ut tonight with the ridge rebounding
quickly behind it tonight into wed. The models have finally come
into agreement that this trof will be mainly clouds for the cwa.

They do generate a little precip over the far wrn CWA late today
shifting a little farther east this evening before the qpf
disappears after 06z. Have kept the slight chance mention of
precip in the grids in these areas thru 06z. Models do keep
somewhat higher rh at lower levels after 06z as the wave shifts
east and have left token low pops in the mtns for the 06-12z
period.

The area dries out Wed as the ridge rebounds. It shifts east
Thursday ahead of a deep cold trof advancing inland with
increasing swly flow over the cwa. These winds aloft should
surface across most WRN valleys Thu and much of the CWA overnight
into Fri morning as the associated cold front begins to move into
ut.

The ec and GFS are a little off on how fast and cold the front
will be as it moves thru NRN ut on fri. The new 06z GFS is a
little slower than the 00z run but it is still faster than the ec.

The main result of this difference is precip turns to snow a
little sooner in the day if the GFS is right.

This still looks like a fairly significant snow storm for much of
the CWA with snow likely impacting travel in the mtns and valleys
across about the NW half of the CWA by sunset fri, spreading south
and east overnight as detailed around the haze. Expecting the
west to increase from partly cloudy this morning to cloudy this
afternoon with the ridge axis shifting east. Removed all pops from
out west this afternoon given the rather dry mid level conditions
and decaying wave approaching from the west. Rest of the forecast
in great shape. Below.

The cold trough and associated cold front remain on target for
moving through the central and southern portions of the CWA after
00z Saturday. The ec has slowed the cold front progression down
some from its previous 12z run. So just in case this solution is
more correct than the faster GFS have adjusted the weather portion
of the forecast between 00z and 06z Saturday to include mixed
precip across the southwest valleys. However, confidence remains
high that this system will be significant so did not touch the
pops in the first 2 twelve hour periods with mountains having
categorical pops Friday night and likely during Saturday, while
the western valleys south of i-80 will be mainly likely or
categorical Friday night and chance Saturday.

Models are a little stronger with the shortwave ridging Saturday
night through Sunday, although they still show a somewhat moist
nw-n 700mb flow over western utah valleys and adjacent mountains.

Consequently, have backed off some on pops especially eastern and
southern areas for this period but left token pops for upslope
areas of western valleys and across the mountains Saturday night
then reduced pops even more on Sunday.

Warm advection develops Sunday night into Monday across northern
portions of the CWA ahead of the next trough. Lowered pops some
across eastern and southern portions of the CWA since they do not
normally due as well under warm advection. The ec and the gfs
diverge in the strength of this trough by Tuesday. Have leaned
toward the slightly less deep GFS trough solution which is more
like the 12z ec mean ensemble. Nonetheless, another round of snow
is expected across the northern two-thirds of the cwa. Have raised
pops a tad for Monday night and Tuesday.

Cold temperatures will prevail during this extended period with
most places about 5 degrees below average, but will feel much
colder in comparison to the recent mild 10-15 degree above average
temperatures we have experienced lately.

Aviation
Little operational concerns at kslc today asVFR conditions will
prevail with gradually increasing mid high-lvl clouds. Light
southeasterly winds are expected to shift to prevailing
northwesterly around 18-19z.

Slc watches warnings advisories
Ut... None.

Wy... None.

Public... 10 wilensky struthwolf
aviation... Carr
for more information from noaa's national weather service visit...

http: weather.Gov saltlakecity
for frequently asked questions about the area forecast discussion
visit...

http: weather.Gov saltlakecity general afd_faqs.Php


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St George Municipal Airport, UT31 mi19 minNW 410.00 miFair49°F37°F64%1025.5 hPa

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Last 24hrSW3CalmCalmCalmCalmW3CalmS3CalmCalmN9CalmE4CalmS3E3SW3CalmCalmCalmNE3CalmCalmNW4
1 day agoCalmCalm3CalmS4SE3SE6CalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalmS4CalmNE3Calm3SW3
2 days agoCalmS3SW5SW4NW3NE3S33N6N7N4SE7N6E5SE4NW3CalmS4CalmCalmCalmCalmCalmCalm

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
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IR Satellite Image from GEOS
west_satellite

GOES Local Image of Southwest    EDIT
Geos

Wind Forecast for Salt Lake City, UT (14,3,4,5)
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Ground Weather Radar Station Cedar City, UT
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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.