Tuesday, December10, 2019
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Marine Weather and Tides
Springdale, 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 7:35AMSunset 5:18PM Tuesday December 10, 2019 8:47 PM MST (03:47 UTC) Moonrise 4:26PMMoonset 5:53AM Illumination 99% Phase: Full Moon; Moon at 14 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 Springdale, UT
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location: 37.24, -112.98     debug


Area Discussion for - Salt Lake City, UT
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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 Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St George Municipal Airport, UT31 mi51 minN 010.00 miFair43°F36°F76%1026.4 hPa

Link to 5 minute data for KSGU

Wind History from SGU (wind in knots)
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Last 24hrNW3N7SW3E4NW3SE3SE3E7E4SE5CalmCalmCalmCalmE3CalmW3NW4CalmSW4SW4SE4CalmCalm
1 day agoCalmW3SE4SE6CalmCalmCalmCalmNE3N3CalmCalmCalmCalmE4CalmCalmW6W5SW6CalmSE4S6SW7
2 days agoCalmCalmCalmCalmCalmCalmS4CalmCalmCalmS4S3CalmCalmCalm3W8W9W13N9NE6SE6N6Calm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Salt Lake City, UT (22,6,7,8)
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Ground Weather Radar Station Cedar 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.