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 7:35AM||Sunset 5:18PM||Tuesday December 10, 2019 8:47 PM MST (03:47 UTC)||Moonrise 4:26PM||Moonset 5:53AM||Illumination 99%|
7 Day Forecast for Marine Location Near Springdale, UTHourly EDIT Help
Area Discussion for - Salt Lake City, UT  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KSLC 110308 AFDSLC
Area Forecast Discussion National Weather Service Salt Lake City UT 808 PM MST Tue Dec 10 2019
SYNOPSIS. High pressure shift east over the Great Basin through early Wednesday. A weak trailing weather disturbance will move east over Utah Wednesday, followed by a more active pattern late in the week.
DISCUSSION. The mid/upper level ridge axis is currently overhead, with a weak shearing disturbance moving inland along the West Coast. The main focus of this update revolves fog potential given the significant subsidence inversion noted on the 00Z KSLC RAOB, with late afternoon mixing capped around 800mb. Air Quality sensors have jumped into the Orange (Unhealthy for Sensitive Groups) north of Salt Lake, and into the Yellow (Moderate) category across the Salt Lake and Utah Valleys. Air Quality will continue to deteriorate into tomorrow.
GOES-17 indicates an initial cirrus shield beginning to exit the region, with clear skies upstream across eastern Nevada. HREF suggests mid and high clouds begin to build in from the west closer to sunrise. So there is a sufficient period of time for good radiational cooling to take place.
Considering locations expected to cool at least 5F below the afternoon crossover temperature, fog is most likely north of Ogden, across the West Desert and southwest Wyoming. Less coverage is expected across basins south of I-80. Fog may also develop along the lake shore.
PREVIOUS DISCUSSION. Upper level ridging continues to build eastward into the Great Basin this afternoon. A weakening disturbance is noted on satellite imagery near the northern California Coast. This disturbance will cross the area Wednesday bringing isolated showers to mainly the far northern mountains and somewhat cooler mid-level temperatures. This may be enough to disrupt valley inversions and improve any haze lingering from Wednesday afternoon.
Attention then turns to a major winter storm expected to impact at least northern Utah Thursday into the weekend. A deep westerly flow regime will impinge upon the West Coast . with IVT values in the 97.5-99.5 percentile range Thursday into Friday. This combined with a stout 170+kt jet maxima will provide the ingredients for a prolonged snow event for the mountains of northern Utah through the remainder of the short term forecast period.
Valley accumulations/snow potential is in question through Friday afternoon as 700mb temps will favor mainly valley rain and bench rain/snow mix. Right now, it looks like valley snow will hold off until mainly the long term portion of the forecast.
Issued a winter storm watch for the northern mountains as confidence is relatively high these areas will see significant snow totals beginning Thursday afternoon. Those traveling during this time should be prepared for winter driving conditions across northern mountain routes.
Mountains).. A winter storm will be ongoing at the beginning of the long term period. A slug of deep moisture from the Pacific will be in place across Utah where PW values will be in the 0.55 to 0.65" range which is in the upper 90th percentile for this time of year. This moist and cooling airmass aided by a strong northwest flow will allow for some upslope snow to occur along the Wasatch and Cottonwoods, where total snow accumulations between 12 to 24 inches with isolated higher amounts will be possible. As the main trough axis moves across southern Utah, the axis of accumulating snow will shift south into the southern mountains. With a weak storm advertised by the latest model runs, snow accumulations across the southern mountains will be less than what the northern mountains receive.
(Benches/Valley Floors).. In the lower elevations, a change over from a rain/snow mix to all snow will occur across the benches as snow levels begin to drop with the arrival of southward moving cold front with cooling temperatures aloft as apparent in upper air profiles beginning early Saturday. Valley locations will continue to see mainly rain ahead of the front with a change over to snow occurring in conjunction with the strong punch of CAA behind the FROPA. This southward moving front should be pushing through northern Utah Saturday morning and move through the SLC valley by the late morning, where snow should begin to accumulate in the valley floors. As the main trough axis moves across Utah, latest model trends show a weaker storm with a track further south than what we were seeing from previous runs. Nevertheless, snow will continue across Utah Sunday before we begin to see precipitation chances end Sunday night. Some additional light accumulations will be possible across the benches and valley floors.
Once the precipitation ends with the exiting storm system, the next impact will be the cold temperatures. Ridging will begin to work its way into western Utah with northerly flow aloft continuing to pump cold air into Utah, apparent by H7 temperatures dropping to ~14C Monday morning, highs will be 5F to 10F below normal.
AVIATION. Periods of mid and high clouds will affect the KSLC terminal into tomorrow morning. Due to valley inversions, haze will continue to build and may restrict slantwise visibility. The fog potential will have to be monitored, but at this point looks unlikely to affect the terminal tonight into tomorrow morning.
SLC WATCHES/WARNINGS/ADVISORIES. UT . Winter Storm Watch from Thursday afternoon through late Friday night for UTZ007>010.
WY . None.
PUBLIC . 10/Kruse/Woodward/Verzella 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.
|St George Municipal Airport, UT||31 mi||51 min||N 0||10.00 mi||Fair||43°F||36°F||76%||1026.4 hPa|
Link to 5 minute data for KSGU
Wind History from SGU (wind in knots)
|1 day ago||Calm||W||SE||SE||Calm||Calm||Calm||Calm||NE||N||Calm||Calm||Calm||Calm||E||Calm||Calm||W||W||SW||Calm||SE||S||SW|
|2 days ago||Calm||Calm||Calm||Calm||Calm||Calm||S||Calm||Calm||Calm||S||S||Calm||Calm||Calm||W||W||W||N||NE||SE||N||Calm|
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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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Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Salt Lake City, UT (22,6,7,8)(on/off)  Help
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