Tuesday, March20, 2018 L-36.com

Marine Weather and Tides
Salt Lake City, UT

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:27AMSunset 7:41PM Tuesday March 20, 2018 7:31 AM MDT (13:31 UTC) Moonrise 8:33AMMoonset 10:14PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 Salt Lake City, UT
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location: 40.78, -111.93     debug

Area Discussion for - Salt Lake City, UT
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Fxus65 kslc 201006
area forecast discussion
national weather service salt lake city ut
406 am mdt Tue mar 20 2018

Synopsis A developing storm system along the west coast will
bring rain and high elevation snow to much of the state for the
latter half of the week. This storm will move east through the
area this weekend, leading to cooler temperatures and lowering
snow levels through Sunday.

Short term (until 00z Saturday) The next upper trough moving
south along the britcol coast today will evolve into a closed low
off the pacific northwest southern britcol coast for the latter
half of the week. Ahead of this developing upper low the
downstream ridge axis along the spine of the rockies will leave
much of the great basin in an increasingly strong, moist, and mild
southwest flow aloft through the end of the week.

For today a low-amplitude ridge across the great basin will
maintain dry conditions and seasonally mild temps areawide. Plenty
of mid high-level moisture will stream through the ridge position
which will serve to hold temps down a few degrees this afternoon.

The atmospheric river (ar) advancing toward the california coast
this morning will be a feature to watch for southern western utah
heading into the latter half of the week. Fairly low pwat values
today will begin to climb tonight, then jump higher across
southern western utah as the ar works across the desert southwest
and southern great basin for Thursday Friday. Pwat values will be
running 3 to 4 standard deviations above normal, leading to a
moisture-rich environment for much of utah late in the week.

The initial weak shortwave ejecting northeast ahead of the
developing coastal upper low tonight does not look to be
especially productive as the thermal support for lift will be
weak and poorly organized. For late tonight and Wednesday the
next weak shortwave lifting northeast through utah will be
supported by fairly deep and moist warm advection. Anticipating a
somewhat broader area of mostly light precip to accompany this
next feature across mainly central and northern utah late tonight
through early Wednesday afternoon.

After a short break in organized precip late Wednesday through
Wednesday night, will look for the intensity and areal coverage
of precip to increase dramatically during the day Thursday. With
deep layer now firmly established across southern western utah,
any supporting synoptic-scale lift should easily generate
widespread and occasionally heavy precip by late Thursday and
through the day on Friday.

One area of concern will be across far southwest utah Thursday
night through Friday morning. Looking at the potential for heavy
rain in extreme southwest utah with the ar pointed at the area of
the state. Synoptic-scale lift looks to be substantial in that
area as the remnant of the upper low currently near 32 140 lifts
through the area as an open wave. Strong low-level warm advection
ahead of this dynamic feature along with terrain upglide will set
up a scenario where persistent moderate to locally heavy rain
could lock in over extreme southwest utah. Looking at significant
rises in area rivers, though with no real snow cover at the
higher elevation to add to the runoff do not anticipate river
flooding at this time.

Snow levels statewide will be rather high as near 700mb temps
remain at or above freezing through Thursday evening. Some modest
cooling aloft later Thursday night will translate into lowering
snow levels, though even then the valleys should see precip-type
remain as rain overnight through Friday. The areal coverage of
precip should trend downward Friday afternoon as the passing
dynamic feature moves east of the area.

Long term (after 00z Saturday) The main storm system is expected
to be along the pacific northwest coast Friday night before moving
inland to impact the forecast area over the weekend. However, there
remains disagreement among the models with respect to how the
scenario evolves. The latest GFS brings the trough across as a more
or less cohesive unit Saturday into Sunday, pushing the associated
cold front through northern utah during the day Saturday and through
the rest of the area by Sunday morning.

The situation remains a bit more complicated in the 00z ec, which
splits off a wave that grazes northern utah during the day Saturday,
bringing an initial push of cooler air into northern utah. That wave
is followed by the main system on Sunday, which phases with another
weaker pacific wave as it does so. It pushes the cold front into
central southern utah by Sunday night but the whole feature stalls
by Monday, with the center shifting to arizona on Tuesday as it
continues to merge with the other wave and closes off.

What these solutions have in common is that they indicate unsettled
weather, particularly over northern utah and southwest wyoming,
through the entirety of the long term period. As such, have kept at
least isolated pops in through day seven. I am most confident about
precip over northern utah with the initial arrival of the front, so
pops are highest there, but have generally broadbrushed pops for the
remainder of the period, lacking confidence in the precise timing of
best precip.

With regard to temperatures, there is relatively high confidence in
the cooldown from the front as the main system moves through, with
the ec and GFS both dropping 700mb temps into the -10c to -12c range
over northern and central utah, so have maintained a drop to maxes
up to 10f below seasonal normals by Sunday with a slow warming trend

Aviation The slc terminal will seeVFR conditions throughout the
day with increasing clouds. Southeast winds are expected to shift to
the northwest between 19z and 21z.

Slc watches warnings advisories
Ut... None.

Wy... None.

Short term... Conger
long term aviation... Traphagan
for more information from noaa's national weather service visit...

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

http: weather.Gov saltlakecity general afd_faqs.Php

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Salt Lake City, Salt Lake City International Airport, UT2 mi38 minSSE 910.00 miMostly Cloudy41°F27°F57%1018.8 hPa
Hill Air Force Base, UT24 mi34 minESE 1010.00 miFair33°F18°F56%1019.3 hPa

Wind History from SLC (wind in knots)
Last 24hrSE5SE7SE64Calm44NW10N6N6N7N8N6N4CalmSE4SE6SE6S6SE5S5S6SE8SE9
1 day agoN8N8N9N11NW12
2 days agoW17

Tide / Current Tables for
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Weather Map and Satellite Images
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GOES Local Image of CentralPlains    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Salt Lake City, UT (9,2,3,4)
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Ground Weather Radar Station Salt Lake City, UT
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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 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.