Wednesday, August12, 2020
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Marine Weather and Tides
Springdale, UT

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 6:47AMSunset 8:30PM Wednesday August 12, 2020 6:19 PM MDT (00:19 UTC) Moonrise 12:00AMMoonset 2:13PM Illumination 34% Phase: Waning Crescent; Moon at 24 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 122144 AFDSLC

Area Forecast Discussion National Weather Service Salt Lake City UT 344 PM MDT Wed Aug 12 2020

SYNOPSIS. Isolated thunderstorms chances continue across portions of northwestern Utah this afternoon and evening with fire weather highlights continuing across a large portion of Utah through Thursday. Hot temperatures arrive across southern Utah on Friday, where an Excessive Heat Watch has been issued. These hot temperatures spread across Utah through the weekend with locations across the SLC seeing temperatures reach triple digits.

SHORT TERM (Through 12z Saturday). Isolated convection is beginning to develop and spread into Box Elder county and along I-80 near Wendover. Main hazards with this round of convection will be strong downburst winds, up to 50 mph and a few cloud to ground lightning strikes. Most of this convection will dissipate during the evening hours, with some residual outflow boundaries bringing brief gusty winds across northern Utah.

Fire weather concerns will remain in place, primarily across northeastern Utah and the Uintas for Thursday, where a Red Flag warning has been issued. Predominately dry conditions will continue across Utah with chances for afternoon convection delegated to the higher terrain. A stagnant area of high pressure across the desert Southwest will begin to shift and strengthen heading into the weekend. Temperatures will respond by turning hot as the dome of high pressure moves closer to Utah by Friday. The heat will first arrive across southern Utah where an Excessive Heat Watch is now in effect for the Saint George area. Temperatures will climb into the 104 to 107 range across extreme southern Utah. Some mid to upper level moisture from the tropical system in the eastern Pacific may spread across southern Utah allowing for the development of thunderstorms across the southern Utah mountains Friday afternoon, but with a very dry sub cloud layer, expect little if any measurable precipitation to occur with these storms. Everywhere else, another hot and dry day can be expected on Friday and continuing into the weekend.

LONG TERM (After 12Z Saturday). Main story for the extended forecast will be hot temperatures this weekend into next week with slowly increasing chances for showers and storms by mid to late portions of next week.

An amplifying ridge will be located across AZ at the start of the extended period becoming centered over the UT/NV/AZ border by Monday. Models are in very good agreement in building the axis of the ridge across Utah and southwest Wyoming extending northward into British Columbia. Temperatures at 700 mb will warm to 17-20 C by Mon/Sun resulting in afternoon temperatures running around 10 degrees above average. High temperatures Sunday and Monday will be around 110 degrees F across southern UT and near 100 degrees along the Wasatch front. Monday looks to be the hottest day with slightly cooler, but still hot conditions continuing beyond Monday.

Some uncertainty in the persistence of the ridge axis begins to develop among model solutions by Tuesday as a shortwave trough enters the PACNW. The ECMWF and EPS are weaker and have a more northward track of the shortwave allowing for the ridge axis to remain fixed across the area through Thursday keeping higher precipitable water to our south and west. The GEFS has more spread in evolution of the trough but has more members bringing the trough further south helping to deamplify the ridge. The GFS control is quite aggressive in deamplifying the ridge along with a few other GEFS members which would allow W/SW mid-level flow to advect in higher PWATs resulting in higher PoPs. Right now, the majority of guidance supports ridge axis remaining across the area, weakening slightly with the passage of the trough to our north. Some advection of moisture will allow for slightly increased PoPs by later in the period, mainly for the higher elevation of the Uintas and central, southern Utah mountain spine.

AVIATION. VFR conditions to continue at the SLC terminal through the valid TAF period as skies remain mainly clear. Northwest winds around 10 knots will turn to the southeast at 5 knots around 04Z.

FIRE WEATHER. Conditions for maintaining critical fire weather conditions will continue due to gusty winds and low RH, as a persistent southwesterly flow aloft will remain in place across the area into Thursday. A weak disturbance may initiate some weak showers and isolated dry thunderstorms across far northwestern Utah and the Utah/Idaho border late this afternoon. Strong downburst and associated outflow winds will be the main hazards, along with a few lightning strikes.

An area of high pressure across the desert Southwest will continue to strengthen and build across much of the Great Basin heading into the weekend. Temperatures will turn hot running 5 to 10 degrees above normal through the weekend and potentially lasting well into next week. Some ambient moisture return in the mid to upper levels will be sufficient enough for the development of some elevated convection each afternoon beginning on Monday. Main concern will be the lack of measurable precipitation reaching the ground with strong, erratic winds occurring near thunderstorm cores, with additional cloud to ground lightning strikes capable of kicking off new fires in the dry vegetation.

SLC WATCHES/WARNINGS/ADVISORIES. UT . Red Flag Warning until 9 PM MDT this evening for UTZ488-489- 492>496-498.

Red Flag Warning until 9 PM MDT Thursday for UTZ479-482>484.

Excessive Heat Watch from Friday morning through Sunday evening for UTZ019.

Red Flag Warning from noon to 9 PM MDT Thursday for UTZ480-481.

WY .

SHORT TERM . Woodward LONG TERM . Burghardt AVIATION . Burghardt FIRE WEATHER . Woodward

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 mi24 minW 1110.00 miFair101°F12°F4%1008.6 hPa

Link to 5 minute data for KSGU

Wind History from SGU (wind in knots)
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Last 24hrW14
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W8S5S8SW6SE6SE8E7E8CalmCalmE6W3N3N3W3W4NW4W9NW10
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2 days agoW8W9W7SW6S5CalmS5E8SE6SE10E8SW3S3CalmCalmNW5SW3W4W4W8W7W6W10
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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 (20,4,5,8)
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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 numerous 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.