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 7:04AM||Sunset 4:42PM||Friday December 6, 2019 9:53 AM CST (15:53 UTC)||Moonrise 1:54PM||Moonset 1:24AM||Illumination 72%|
7 Day Forecast for Marine Location Near Winchester, MOHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 061150 AFDLSX
Area Forecast Discussion . Updated Aviation National Weather Service Saint Louis MO 550 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 12z TAFs through 12z Saturday Morning) Issued at 441 AM CST Fri Dec 6 2019
A cold front was just southeast of STL early this morning, and will continue moving southeastward today. Post frontal MVFR cloudiness around 1500 feet in height has advected into UIN early this morning and should spread into COU and into the St Louis metro area later this morning. This shallow and thin low level cloudiness will gradually rise in height and scatter out late this morning and early this afternoon. The surface wind will become north- northwesterly as well as strengthen and become gusty in the St Louis metro area later this morning as it already has in UIN and COU. The surface wind will weaken by late afternoon as a surface ridge drops southeastward into MO from the northern Plains.
SPECIFICS FOR KSTL: A cold front was just southeast of STL early this morning, and will continue moving southeastward today. Post frontal MVFR cloudiness around 1500 feet in height has advected into UIN early this morning and should spread into STL later this morning. This shallow and thin low level cloudiness will gradually rise in height and scatter out early this afternoon. The surface wind will become north-northwesterly as well as strengthen and become gusty later this morning as it already has in UIN and COU. The surface wind will weaken by late afternoon as a surface ridge drops southeastward into MO from the northern Plains.
PRELIMINARY POINT TEMPS/POPS. Saint Louis 46 29 49 38 / 10 0 0 0 Quincy 40 24 46 36 / 0 0 0 0 Columbia 43 26 49 38 / 5 0 0 0 Jefferson City 44 26 51 38 / 5 0 0 0 Salem 48 28 47 36 / 30 0 0 0 Farmington 49 27 50 35 / 30 0 0 0
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.
|St. Louis, Spirit Of St. Louis Airport, MO||8 mi||59 min||N 14 G 20||10.00 mi||Overcast||41°F||34°F||76%||1023.6 hPa|
|St. Louis Lambert International Airport, MO||15 mi||62 min||N 18 G 23||8.00 mi||Overcast and Breezy||43°F||34°F||71%||1023.5 hPa|
|St. Louis Downtown Airport, IL||20 mi||60 min||N 15 G 24||10.00 mi||Overcast||42°F||34°F||73%||1022.8 hPa|
Link to 5 minute data for KSUS
Wind History from SUS (wind in knots)
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|2 days ago||SW||W||SW||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W||W |
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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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Wind Forecast for St. Louis, MO (10,2,3,4)(on/off)  Help
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