Friday, December13, 2019
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Marine Weather and Tides
Salt Lake City, UT

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:40AMSunset 5:01PM Thursday December 12, 2019 11:15 PM MST (06:15 UTC) Moonrise 5:41PMMoonset 8:05AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 130250 AFDSLC

Area Forecast Discussion National Weather Service Salt Lake City UT 750 PM MST Thu Dec 12 2019

SYNOPSIS. The first in a series of fast moving weather disturbances will continue to cross northern Utah tonight. Periods of rain and snow will continue across northern Utah and southwest Wyoming through Friday night, then shift south into southern and central Utah over the weekend.

DISCUSSION. Anomalously rich moisture remains across the region at the nose of the Atmospheric River. A strong jetlet within the Pacific jet crosses overhead later tonight, which will begin a period of cold advection. This will continue to support mainly rain showers across the valleys, rain/snow showers colder valleys, and snow above 6000 feet.

Considered canceling the Winter Weather Advisories for north of Ogden and the Cache Valley, as dewpoints are currently above freezing and roads are in the mid to upper 30s. However, as cold advection ensues later tonight, there is a potential of slick roads as rain transitions to snow, lasting into tomorrow morning. So kept all headlines as is.

PREVIOUS DISCUSSION. Showers this afternoon have continued to persist across northern Utah and now progressing into central Utah per latest radar and satellite imagery. The long fetch moisture/atmospheric river continues to bombard the northern west coast and will drive our long duration winter storm across the region through the weekend. The forecast is nicely coming together for the event, although till with some uncertainties. The winter storm headlines in effect look to be in good shape, so no plans at this time to change those.

One of the big challenges has been the timing of change over from rain to snow along the Wasatch front. A mostly warm advection flow pattern in place will keep the boundary layer warm in the lower elevations. As evident of this, parts of the Cache Valley and areas along the northern Wasatch Front south into the Salt Lake Valley have warmed into the upper 30s and even low 40s this afternoon. The 700mb baroclinic zone will change very little over the next 24 hours, shifting from warm to cold and back to warm advection. The mountains will continue to see good snowfall accumulations while valleys remain mostly rainy. Mountain routes Friday morning may see impacts on area roadways, with those areas to see a cooling trend faster than lower elevation/valleys, especially mountain routes/passes in northern Utah.

Moving into later Friday, an embedded shortwave and associated cold front should assist in beginning the turn to cold advection from north to south. The upper level jet will begin to shift southward as well. The changeover from rain to snow in valleys along the Wasatch Front will take place sometime Friday evening through Saturday morning. This change seems to be the one feature that keeps shifting. Accumulations in these areas are expected to persist over a longer period of time, and bench areas should see isolated higher amounts.

Through the day Saturday the longwave trough begins to dig south along the west Coast which will help push the baroclinic zone into south-central Utah. The focus of precipitation then shifts to southern Utah. At the moment, short-range ensemble guidance doesn't handle this part of the event very well with much uncertainty in the best dynamics or where the boundary will set up and whether or not frontogenetic forcing will be strong. This will be the next area of focus.

As the shortwave trough slowly moves out of the area Sunday night, a trailing shortwave disturbance will drop into Utah, reinforcing the cold air over the area. Temperatures at 700mb are progged to lower to -16C over northeast Utah and -34C at 500mb. This could maintain some instability to generate a few showers over northern Utah, primarily the mountains, through at least Sunday night. Depending on how much low-level moisture remains in place and how slowly lake temperatures modify, there could be some potential for the GSL to get involved, but there is too much uncertainty in that regard this far out.

High pressure will build in from the West Coast Monday night, and the stable airmass will trap existing cold temperatures at the low levels and strengthen valley inversions through at least midweek. Later in the week, there is a potential for change. However, there remains quite a bit of model spread during this timeframe. The operational GFS and EC are out of phase on Thursday, with both being outliers from the GEFS and EPS ensemble means. For now, just went with a trend of increasing clouds and some low PoPs per ensemble means.

AVIATION. The mountains surrounding the KSLC terminal will remain obscured tonight. Southeast winds shift toward the northwest around 05Z with the passage of a cold front. Periods of rain will prevail through the overnight hours, with VFR conditions transitioning to MVFR with the passage of the cold front.

SLC WATCHES/WARNINGS/ADVISORIES. UT . Winter Storm Warning until 5 PM MST Saturday for UTZ007>010.

Winter Weather Advisory until 5 PM MST Saturday for UTZ006.

Winter Weather Advisory until 9 AM MST Friday for UTZ001-002.

WY . Winter Weather Advisory until 5 PM MST Saturday for WYZ021.



PUBLIC . 10/Dewey/Cheng AVIATION . 10

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
Salt Lake City, Salt Lake City International Airport, UT2 mi21 minSE 810.00 miMostly Cloudy40°F37°F89%1018.5 hPa
Hill Air Force Base, UT24 mi77 minS 1010.00 miOvercast38°F36°F94%1019 hPa

Link to 5 minute data for KSLC

Wind History from SLC (wind in knots)
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Last 24hrSE12SE10SE7E9SE8SE6SE7S10S11SE6SE8SE9S10
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1 day agoN6CalmE4SW4CalmSW4CalmCalmSE5W5W3CalmSE5S6N3N7CalmS6SE7SE4SE7E4SE5SE8
2 days agoSE6SE5S6SE6SE8SE8SE6SE5SE5SE6SE7S54S64CalmN5W4NW5CalmSW4SE3SE6SE4

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Salt Lake City, UT (1,6,7,8)
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Ground Weather Radar Station Salt Lake 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.