Marine Weather and Tides
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 7:40AM||Sunset 5:01PM||Thursday December 12, 2019 11:15 PM MST (06:15 UTC)||Moonrise 5:41PM||Moonset 8:05AM||Illumination 98%|
7 Day Forecast for Marine Location Near Salt Lake City, UTHourly EDIT Help
Area Discussion for - Salt Lake City, UT  (on/off)  Help NOTE: mouseover dotted underlined text for definition
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 StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Salt Lake City, Salt Lake City International Airport, UT||2 mi||21 min||SE 8||10.00 mi||Mostly Cloudy||40°F||37°F||89%||1018.5 hPa|
|Hill Air Force Base, UT||24 mi||77 min||S 10||10.00 mi||Overcast||38°F||36°F||94%||1019 hPa|
Link to 5 minute data for KSLC
Wind History from SLC (wind in knots)
|1 day ago||N||Calm||E||SW||Calm||SW||Calm||Calm||SE||W||W||Calm||SE||S||N||N||Calm||S||SE||SE||SE||E||SE||SE|
|2 days ago||SE||SE||S||SE||SE||SE||SE||SE||SE||SE||SE||S||S||Calm||N||W||NW||Calm||SW||SE||SE||SE |
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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.
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Wind Forecast for Salt Lake City, UT (1,6,7,8)(on/off)  Help
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