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 7:01AM||Sunset 4:44PM||Friday December 6, 2019 11:37 AM CST (17:37 UTC)||Moonrise 1:52PM||Moonset 1:22AM||Illumination 73%|
7 Day Forecast for Marine Location Near Ozora, MOHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 061725 AFDLSX
Area Forecast Discussion . Updated Aviation National Weather Service Saint Louis MO 1125 AM CST Fri Dec 6 2019
SHORT TERM. (Through Late Sunday Afternoon) Issued at 348 AM CST Fri Dec 6 2019
An upper level shortwave is currently passing through the region, driving a surface trough and cold front through the mid-Mississippi Valley. Weak WAA ahead of the front has resulted in light rain across much of southern MO and IL. Behind the front, high pressure is building into the Northern Plains, with a thin layer of low stratus across much of the north central CONUS.
Northwest upper level flow will take hold across the central CONUS today and remain in place before turning zonal on Saturday night. The NW flow will help drive the cold front through the region today, with high pressure moving in behind the front. The upstream post-frontal low stratus will also build into the mid-Mississippi Valley this morning and remain in place into at least the early afternoon before mixing and advecting out of the region. The combination of clouds and northerly winds will drop today's highs about 15 degrees compared to what we saw yesterday.
Skies will remain mostly clear tonight, which coupled with calm winds beneath the surface high, should allow tonight's lows to drop into the 20s across much of the region. As low level high pressure slides east of the area on Saturday, winds will swing around to the south. This will draw warmer air back into the region, pushing high temps back into the 40s and 50s on Saturday, and perhaps the 60s on Sunday in central and southern MO.
LONG TERM. (Sunday Night through Thursday) Issued at 348 AM CST Fri Dec 6 2019
By Sunday evening, guidance is in consensus showing a broad upper level trough across the western CONUS. A shortwave embedded in the flow ahead of the trough will gradually drive cyclogenesis across the Central Plains on Sunday night. The shortwave, cyclone, and associated cold front will push through the region on Monday, before the parent upper trough drives a secondary shot of low-level cold air into the region on Tuesday.
This pattern will result in a handful of impacts for the mid- Mississippi Valley. First up, several GEFS, SREF, and ECMWF ensemble members are showing precip developing in the warm, moist flow ahead of the surface low early on Monday morning. At least a chance of precip will then persist until the front clears the area on Monday night, and temps may even be cool enough to generate some light snow before the precip ends. Secondly, a tight pressure gradient on the back side of the low will result in stiff northerly winds on Monday night and Tuesday morning. Finally, the most noticeable impact will be the much colder cold temps behind the front. Blended guidance is showing high temps on Tuesday near or just above freezing. GEFS guidance is even a tick colder, with the mean remaining below 30 through the day on Tuesday. Lows on Wednesday morning will be the coldest of the week, dropping into the teens across the region. High pressure will gradually slide to the east of the region on Wednesday, keeping things quiet and cool through midweek.
AVIATION. (For the 18z TAFs through 18z Saturday Afternoon) Issued at 1102 AM CST Fri Dec 6 2019
MVFR ceilings are beginning to erode at KUIN and KCOU while still holding on in the metro terminals, including KSTL. The MVFR stratus deck is forecast to continue to move out of all terminals by the early afternoon hours, leaving VFR conditions for the remainder of the TAF period. The gusts associated with this morning's cold front will continue to diminish through the day before ending completely just before sunset. Winds will become light and variable tonight into tomorrow morning as a surface ridge continues to move east into the region.
There is some potential for river fog development tonight, impacting KSUS and KCPS, but development depends largely on how long the stratus sticks around.
SPECIFICS FOR KSTL:
MVFR stratus continues to impact KSTL. During the first two hours of the TAF period overcast MVFR ceilings will start to break up, and should move out of the terminal during the early afternoon. Gusts remain possible through the mid afternoon, however recent obs have noted a diminished frequency in the surface gusts in comparison to this morning. For the remainder of the TAF period, light and variable winds are expected as the surface ridge moves into the area.
PRELIMINARY POINT TEMPS/POPS. Saint Louis 46 29 49 38 / 0 0 0 5 Quincy 40 24 46 36 / 0 0 0 0 Columbia 43 26 49 38 / 0 0 0 0 Jefferson City 44 26 51 38 / 0 0 0 0 Salem 49 28 47 36 / 5 0 0 0 Farmington 50 27 50 35 / 5 0 0 5
LSX WATCHES/WARNINGS/ADVISORIES. MO . None. IL . None.
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.
|Farmington Airport, MO||20 mi||42 min||N 12 G 20||10.00 mi||Mostly Cloudy||45°F||37°F||74%||1024.2 hPa|
Link to 5 minute data for KFAM
Wind History from FAM (wind in knots)
|1 day ago||W||W||NW||NW||W||Calm||NW||Calm||W||Calm||S||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||S||S||S|
|2 days ago||W||SW||SW||SW||SW||Calm||S||Calm||W||W||W||SW||W||W||W||W||W||SW||SW||Calm||W||W |
EDIT Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map(on/off)  Help Weather Map
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 St. Louis, MO (12,3,4,5)(on/off)  Help
Ad by Google
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
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.