Sunday, December15, 2019
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Marine Weather and Tides
Moab, UT

Version 3.4
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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 7:24AMSunset 4:54PM Sunday December 15, 2019 2:08 PM MST (21:08 UTC) Moonrise 8:46PMMoonset 10:38AM Illumination 83% Phase: Waning Gibbous; Moon at 19 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 Moab, UT
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location: 38.52, -110     debug


Area Discussion for - Salt Lake City, UT
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FXUS65 KSLC 151741 AFDSLC

Area Forecast Discussion National Weather Service Salt Lake City UT 1041 AM MST Sun Dec 15 2019

SYNOPSIS. A storm system will continue to bring largely snow to the UT/AZ border region into the afternoon prior to shifting east of the area. Another weak weather system will bring some lake effect snow showers to the Salt Lake Valley late tonight through Monday morning with minor snow accumulations possible. High pressure will build across the region for the first half of the work week.

DISCUSSION. Noting an H7 circulation spinning up over far southern Utah in the vicinity of Bryce Canyon as a cold upper trough continues to translate east across a stalled boundary over the UT/AZ region. Widespread precip (mostly snow) has been the norm with this across far southern Utah over the last several hours with accumulating snow in Zion National Park and much of the Grand Staircase region, with even a few flakes falling in St George over the last few hours. Maintaining the advisory in place for this through midday, as several area roads have been impacted (outside of Dixie proper).

A well defined back edge of this precip is seen in both satellite and KICX attm, just east of the I-15 corridor in Dixie and progressing east at a more rapid clip due to the aforementioned H7 spin up. Although moderate to even locally heavy snow continues across the Grand Staircase currently, do expect a fairly rapid decreasing trend in both intensity and areal coverage after midday as the circulation shifts east while bringing the most focused forcing with it. A drier and more subsident northwest flow will spread across the region in wake. Latest update focused on this southern region, with refined snow potential and amounts into this afternoon.

PREVIOUS DISCUSSION. Otherwise, mean troughing will remain in place across the intermountain west tonight, while a trailing weak shortwave embedded in the northwest flow will cross northern Utah late tonight through Monday morning. Forecast models agree on increasing low- level moisture ahead of this wave, which when combined with the weak synoptic ascent ahead of the wave and cold temperatures in place over the Great Salt Lake should result in the development of some lake effect snow showers. BUFKIT profiles from the GFS/NAM agree on the overall low-level moisture and low- level thermal profiles conducive for lake effect convection to develop. However, relatively light boundary layer winds with some osculation in direction between 290-315 degrees will likely preclude the development of an organized lake plume as some overzealous high resolution model suggest. Instead expect more disorganized lake effect snow showers to spread some light snow accumulations across portions of the Salt Lake Valley. Generally expect accumulations will be in the dusting to 2 inch range, with locally higher amounts possible. The light flow will also likely preclude much lake effect/enhancement of snow into the Cottonwood Canyons, with most snow accumulation likely limited to locations closer to the lake. Any snow showers will quickly diminish by late morning in the wake of the shortwave passage.

Ridging will quickly build across the forecast area for late Monday through early Wednesday. Inverted conditions will return for the northern Utah valleys, with cool air remaining trapped in the wake of the departing storm systems. However, by Wednesday a decaying, moisture-starved Pacific trough will crash the ridge, but more on that below .

A weakening shortwave trough translating through a mean mid level ridge will traverse the forecast area late Wednesday into Thursday. This wave will remain moisture starved, however cooling aloft will weaken if not dislodge valley inversions across northern/western Utah. Otherwise a mean mid level ridge will remain in place through the long term period. As such have continued to lean on a blend of model guidance with respect to temperatures and PoPs.

AVIATION. VFR conditions are expected to persist over the SLC terminal through ~03Z with CIGs dropping to ~6000ft AGL thereafter. There is a 30% chance that snow showers will affect the airfield after 03Z, bringing periodic IFR conditions within localized snow showers and a potential for T-2 inches of accumulating snow. Otherwise, expect light northwest winds to persist over the airfield, becoming variable at times after 03Z.

SLC WATCHES/WARNINGS/ADVISORIES. UT . Winter Weather Advisory until 11 AM MST this morning for UTZ020.

WY . None.

DISCUSSION/AVIATION . Merrill/Webber PREVIOUS DISCUSSION . Church/Seaman

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
Moab, Canyonlands Field, UT22 mi16 minWNW 610.00 miFair35°F17°F48%1010.2 hPa

Link to 5 minute data for KCNY

Wind History from CNY (wind in knots)
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Last 24hrNE3W8W9W12W12W11NW9CalmCalmCalmCalmNE3CalmCalmCalmNW83W5CalmNW5NW4NW5NW5W6
1 day agoSE8SE3SE5CalmCalmCalmS3CalmNE3E4NE3W3CalmS3CalmCalmW4CalmCalmCalmNW11NW8NW5W3
2 days agoNW7N7NW5NW4CalmCalmCalmCalmCalmCalmSW5CalmCalmW8NW6NW3NW7CalmCalmCalmSE6SE6SE4SE6

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 (16,3,4,5)
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Ground Weather Radar Station Grand Junction, CO
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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.