Marine Weather and Tides
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 7:14AM||Sunset 5:07PM||Monday January 18, 2021 9:06 PM CST (03:06 UTC)||Moonrise 10:42AM||Moonset 10:52PM||Illumination 32%|
7 Day Forecast for Marine Location Near Holiday Shores, ILHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 190257 AFDLSX
Area Forecast Discussion . Updated National Weather Service Saint Louis MO 857 PM CST Mon Jan 18 2021
UPDATE. Issued at 839 PM CST Mon Jan 18 2021
Have dropped the western half of the advisory. We have had reports up to 0.8" of snowfall across Missouri earlier before the band of snow moved into Illinois. This band has now quickly moved into the eastern CWA now that the vort max vort has moved into central Missouri. Radar is showing that the most intense precipitation is falling as rain, with lighter snow falling back to the northwest over the advisory area. Expect this snow to move out of the area in the next few hours as the vort continues to move east and may cancel the advisory early if this trend continues.
Otherwise introduce areas of fog later tonight into tomorrow morning across parts of southeast and central Missouri where last few SREF/HRRR model runs have been consistent in visibilities falling below 1 mile in these areas late tonight. Will hold off on issuing an advisory at this point, but will need to watch the trends overnight.
Otherwise, the rest of the forecast looks on target and made few changes.
SHORT TERM. (Through Late Tuesday Night) Issued at 233 PM CST Mon Jan 18 2021
Main short term issue is snowfall potential the remainder of the afternoon through the evening associated with a clipper low- amplitude short wave currently located across the central Plains. The anticipated band of precipitation has been slow to develop thus far but a combination of regional radars and surface obs are showing there has been an uptick in the last hour or so. The combination of large scale ascent associated with the short wave and largely mid level frontogenetic forcing should allow the band to continue becoming better organized the remainder of the afternoon and into the early evening. Evaporative cooling is supporting snow within the band across western MO, and this trend should continue as the band spreads east into the evening. That said the initial temperatures ahead of the band are in the middle to upper 30s. I think these initially warm temperatures, combined with somewhat warm ground temperatures, and the fast system motion is going to limit accumulations. Probably through the remainder of the afternoon it will be hard to get accumulations on much other than elevated or grassy surfaces, and then after sunset the potential of getting at least some accumulation on roads will increase. That area would be from eastern MO into southwest IL. The axis of the band looks like it should be near a Moberly-Vandalia-Litchfield line and a narrow band of up to an inch of snow is possible, mainly on the eastern half of this axis. Accumulating snow should be east of the area by midnight. I have removed some of the far western counties out of the advisory, not that I don't think it will snow there, but I am not expecting any meaningful impacts before the snow ends by early evening.
Clouds and seasonably cold temperatures will dominate on Tuesday with the area remaining in northwest flow aloft and the next short wave looking to pass to the north of the area.
LONG TERM. (Wednesday through Next Monday) Issued at 233 PM CST Mon Jan 18 2021
Heights aloft are on the rise Wednesday and this combined with a return of south-southwest low level flow and WAA should bring a return of warmer temperatures/above normal that will continue into Thursday. A cold front will then push through the region on Thursday night ushering a return of seasonably cold winter temperatures for Friday and Saturday as a expansive surface high pressure system moves into and dominates the area.
The deterministic and ensembles indicated a pattern change will occur heading into this weekend with an active split flow. The southern stream appears to be the more dominate of the streams with a closed low developing along the west coast, an upper low near Lake Winnipeg, and increasingly west-southwest flow aloft over the Nation's midsection. The next threat of precipitation could occur as early as late Saturday night into Sunday with return flow and WAA which could include wintry precipitation at the onset before the low level warm. Still pretty far out and a good deal of uncertainty in the details at this time range.
AVIATION. (For the 00z TAFs through 00z Tuesday Evening) Issued at 533 PM CST Mon Jan 18 2021
Band of light rain and snow will affect the St. Louis area terminals early in the period with MVFR visibilities before moving east. Then dry weather is expected the rest of the period. MVFR ceilings are expected at the St. Louis area terminals through the night before lifting by 12Z Tuesday. KCOU will see MVFR ceilings develop this evening that will continue through Tuesday afternoon, with some potential for IFR ceilings late tonight into Tuesday morning. KUIN will have mainly VFR conditions through tonight, with MVFR ceilings moving in late Tuesday morning and afternoon.
SPECIFICS FOR KSTL:
A band of light rain and snow will affect the terminal early in the period with MVFR visibilities before moving east of the terminal by 02Z. Low clouds with MVFR ceilings are expected to persist at the terminal from early evening through 12Z Tuesday. Then mainly dry and VFR conditions are expected, though there remains a low possibility for MVFR ceilings to move back into the airport during the late morning and early afternoon on Tuesday.
LSX WATCHES/WARNINGS/ADVISORIES. MO . None. IL . Winter Weather Advisory until midnight CST tonight for Bond IL- Fayette IL-Macoupin IL-Montgomery IL.
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 Regional Airport, IL||3 mi||77 min||N 6||10.00 mi||Overcast||34°F||34°F||100%||1019.3 hPa|
|St. Charles, St. Charles County Smartt Airport, MO||23 mi||73 min||N 3||10.00 mi||Overcast||36°F||33°F||89%||1019.1 hPa|
|St. Louis Lambert International Airport, MO||23 mi||76 min||N 5||9.00 mi||Light Rain Snow||38°F||33°F||83%||1019.9 hPa|
|Litchfield Municipal Airport, IL||23 mi||72 min||N 0||4.00 mi||Light Snow||33°F||32°F||98%||1019.6 hPa|
Link to 5 minute data for KALN
Wind History from ALN (wind in knots)
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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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