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 7:08AM||Sunset 4:40PM||Thursday December 12, 2019 8:25 AM CST (14:25 UTC)||Moonrise 5:18PM||Moonset 7:30AM||Illumination 99%|
7 Day Forecast for Marine Location Near Elsah, ILHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 121137 AFDLSX
Area Forecast Discussion . Updated Aviation National Weather Service Saint Louis MO 537 AM CST Thu Dec 12 2019
SHORT TERM. (Through Late Friday Afternoon) Issued at 305 AM CST Thu Dec 12 2019
Surface analysis early this morning is showing that a warm front has moved north of St. Louis. Consequently, temperatures are warmer than the have been the past few mornings with readings in the 20s under increasing high clouds. These clouds were occurring ahead of a weak shortwave trough currently over the Central Plains. The weather is expected to remain dry through early tomorrow as the atmosphere is dry through a deep layer. Highs today will climb into the upper 40s and lower 50s given the relatively warm start and the warm air advection. Lows tonight will stay near freezing. There will be slight chance of rain over northeast Missouri on Friday afternoon in advance of a trough that will be digging into the Midwest. Highs again on Friday are expected to be above normal.
LONG TERM. (Friday Night through Wednesday) Issued at 305 AM CST Thu Dec 12 2019
Still appears that a upper trough will drop down across Missouri and Illinois on Friday night into early Saturday with the GFS/ECMWF bringing the attendant cold front across the CWA late Friday night and Saturday morning. Will continue with a chance for a light wintry mix with this system as strong cold air advection moves in behind the front. Still expecting little if any snow/ice accumulations with at this point as the model forcing fields are relatively weak and QPF amounts are light.
Guidance temperatures from both the GEFS/ECMWF ensembles continue to fall below normal behind the front. There continues to be a considerable amount of uncertainty with the trough that will move across the area early next week. The individual ensemble members of the GEFS and ECMWF EPS continue to show a notable range in solutions from north to south. This includes the 00Z operational GFS which brings the surface low track across the center of the CWA on Monday that would bring accumulating snow in the northern CWA and thunderstorms in the southern CWA. The latest GEFS brings its surface low across northern Arkansas into the Ohio Valley and the ECMWF EPS is just south of it. I do have increasing confidence that we will see precipitation Sunday into Monday night, so have increase PoPs during this period. Precipitation type is still in question as it may still be rain/snow or a wintry mix depending where you are with some accumulation possible.
Tuesday into Wednesday still looks dry as large surface high moves into the Midwest under deep dry layer. Forecast plumes from the GEFS mean and the CIPS analogs support below normal temperatures.
AVIATION. (For the 12z TAFs through 12z Friday Morning) Issued at 531 AM CST Thu Dec 12 2019
LLWS remains the primary concern into mid-morning, with weak southerly winds at the surface and strong southwesterly winds between 1500-2000 feet. The surface winds will begin to pick up later this morning, resulting in a more uniform wind profile in the lowest 2000 ft, ending the LLWS threat. Otherwise, broken to overcast cirrus will briefly give way to mostly clear skies before more mid and high clouds move into the area this evening and overnight.
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 Lambert International Airport, MO||12 mi||34 min||S 9||10.00 mi||Mostly Cloudy||38°F||25°F||60%||1028.5 hPa|
|St. Louis Regional Airport, IL||17 mi||35 min||SSE 11||10.00 mi||Mostly Cloudy||36°F||28°F||75%||1028.1 hPa|
|St. Louis, Spirit Of St. Louis Airport, MO||24 mi||31 min||S 7||10.00 mi||Overcast||42°F||24°F||49%||1027.8 hPa|
Link to 5 minute data for KSET
Wind History from SET (wind in knots)
|1 day ago|
|2 days ago|
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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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Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for St. Louis, MO (9,2,3,4)(on/off)  Help
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