Monday, January25, 2021
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Marine Weather and Tides
Portage Des Sioux, MO

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:10AMSunset 5:15PM Monday January 25, 2021 1:20 PM CST (19:20 UTC) Moonrise 2:17PMMoonset 4:46AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 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 Portage Des Sioux, MO
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location: 38.94, -90.3     debug


Area Discussion for - St. Louis, MO
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FXUS63 KLSX 251743 AFDLSX

Area Forecast Discussion . Updated National Weather Service Saint Louis MO 1143 AM CST Mon Jan 25 2021

UPDATE. Issued at 1137 AM CST Mon Jan 25 2021

Surface temperatures remain around or slightly above freezing in northeast MO and west-central IL, which does not bode well for ice accretion. Amounts were reduced, but another round of light precipitation downstream will be monitored for impacts. The most likely scenario appears to be a mix of rain and snow during the afternoon, changing to light snow through the evening. The heaviest rainfall that dropped over 1.5" of rain in portions of the central and southeastern CWA is now east of the area. While showers are still lingering along and south of I-70, the bulk of precipitation is over for this area. As expected, dry antecedent conditions prevented any impactful flooding, but rises on several tributaries were observed through the morning.

MRB

SHORT TERM. (Through Late Tuesday Afternoon) Issued at 358 AM CST Mon Jan 25 2021

Initial wave of rain continues to expand in coverage and slide northward into region early this morning. Still a rather complex forecast with varying factors affecting the precipitation type. A number of models/soundings are still indicating that the dendritic growth zone will lose saturation by late this morning, especially across northern portions of forecast area where the wintry mix has been forecast to occur. Surface temperatures in this area will remain right around 32 degrees today through this evening, before colder air finally moves in late tonight. This would keep a mainly light rain/freezing rain scenario, with ice accumulations up to two tenths of an inch possible for the Winter Weather Advisory area, though some minor snowfall accumulations are still possible, especially during the morning hours today.

Other issue with this system continues to be the heavy rain expected for areas along and south of I-70 through midday today. Rainfall between half an inch and an inch, with locally higher amounts across portions of southeast Missouri, is expected. While we could still see close to record daily rainfall amounts at both KSTL and KUIN, it looks like amounts will be a bit less than previously forecast. Also, our dry antecedent conditions should keep flooding risks to a minimum. Have seen some lightning early this morning via NLDN lightning plot as well as GOES 16 GLM products. So still expect some rumbles of thunder across portions of southeast Missouri today. By this afternoon, dry slot will slide across southern half of forecast area, with precipitation tapering off in this area by early this evening, while precipitation lingers along and north of I-70 through Tuesday morning.

Dry conditions expected by Tuesday afternoon with highs in the low 30s to mid 40s.

Byrd

LONG TERM. (Tuesday Night through Sunday) Issued at 358 AM CST Mon Jan 25 2021

After a bit of a break in activity Tuesday night, another system will slide through region on Wednesday as upper level trough over the southwestern U.S. lifts northeastward through region. Latest model and ensemble runs are a bit weaker with this system and moisture return is questionable, so kept NBM solution with just slight chance/low end chance POPs on Wednesday.

Otherwise, near normal temperatures are expected through Thursday before warming up into the mid 40s to low 50s by Saturday. Next chance for rain will be Saturday through Saturday night and with the warmer weather it will mainly be in the form of rain at this time.

Byrd

AVIATION. (For the 18z TAFs through 18z Tuesday Afternoon) Issued at 1106 AM CST Mon Jan 25 2021

IFR conditions currently in place are expected to hold in place at the terminals throughout the forecast period. After this morning's heavy rain at KCOU and the St. Louis metropolitan terminals, drier air will move into central and southern Missouri through the evening and end precipitation chances there. KUIN still has the potential to see a rain/snow mix through the evening tonight, but precipitation rates should remain light.

Despite drier air moving in, low stratus is expected to linger in place across the region. IFR CIGs are expected to lower to LIFR overnight, and while slight improvements or variations in the ceilings are possible, categorical changes are not expected until beyond the forecast period.

MRB

PRELIMINARY POINT TEMPS/POPS. Saint Louis 41 36 38 28 / 100 20 5 5 Quincy 35 30 32 21 / 90 60 40 10 Columbia 41 31 34 24 / 100 20 5 10 Jefferson City 44 34 36 26 / 100 20 5 10 Salem 41 37 42 29 / 100 20 5 0 Farmington 45 36 41 27 / 100 5 0 5

LSX WATCHES/WARNINGS/ADVISORIES. MO . Winter Weather Advisory until 6 AM CST Tuesday for Knox MO-Lewis MO-Marion MO-Shelby MO.

IL . Winter Weather Advisory until 6 AM CST Tuesday for Adams IL- Brown IL.



WFO LSX


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Charles, St. Charles County Smartt Airport, MO7 mi26 minE 119.00 miLight Snow38°F34°F86%1005.6 hPa
St. Louis Regional Airport, IL13 mi30 minENE 1310.00 miOvercast36°F36°F100%1005.4 hPa
St. Louis Lambert International Airport, MO13 mi29 minE 109.00 miOvercast37°F34°F89%1005.9 hPa

Link to 5 minute data for KSET

Wind History from SET (wind in knots)
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Last 24hrCalmNE3NE6NE5NE4NE3NE6E6E7E5E6E8E8E13E9E9E11E13
G19
NE6E10E15E13E13E11
1 day agoSE10SE11SE11SE12SE12E11E11SE11SE11SE8SE10SE8SE7CalmSE4SE4SE5SE6SE4SE4SE3CalmCalmCalm
2 days agoN9N8N8N8N8N8N7N8N6NE6NE8NE7NE7NE3NE4NE5NE5E4E3E7E7E9SE8SE7

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
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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
Ground Weather Radar Station




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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 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.