Thursday, September23, 2021
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Marine Weather and Tides
Shipman, IL

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:48AMSunset 6:57PM Thursday September 23, 2021 12:28 PM CDT (17:28 UTC) Moonrise 7:30PMMoonset 8:18AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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 Shipman, IL
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location: 39.18, -90     debug


Area Discussion for - St. Louis, MO
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FXUS63 KLSX 231702 AFDLSX

Area Forecast Discussion . Updated Aviation National Weather Service Saint Louis MO 1202 PM CDT Thu Sep 23 2021

SHORT TERM. (Through Late Friday Afternoon) Issued at 315 AM CDT Thu Sep 23 2021

Early this morning, a nearby surface high pressure center in western MO and clear sky has enabled efficient radiational cooling of temps to the mid-40s to low-50s F. The combination of these cool temps and warm water temps of rivers and lakes in the region has also yielded patchy, shallow steam fog. Otherwise, dry and mostly clear conditions (outside of a few to scattered diurnal cumulus) will prevail today with large-scale subsidence dominating the region in the wake of the departing upper-level closed low to the northeast. High temps today will likely be similar to Wednesday, but could be a couple degrees warmer across central MO with 850-hPa temps increasing by around 2 C as a low-level ridge nears the CWA.

On Friday, an upper-level trough diving into the Northern Plains and Midwest is expected to force a cold front southeastward, approaching the CWA through the day. As a result, WAA will strengthen as low- level flow strengthens and becomes increasingly southwesterly with the low-level ridge shifting east and cold front approaching. Therefore, high temps will warm to near or slightly above average. This cold front is progged pass through the CWA from Friday evening through Saturday morning, albeit slowly weakening as it becomes detached from the strongest mid-level support attendant to its parent trough. Given that moisture return will be poor and low-level convergence along the front is not expected to be particularly strong, coverage of associated precip should be limited. Currently, isolated to scattered showers are most favored across west-central and south-central MO, where low-level convergence/moisture convergence should be greatest locally. An isolated thunderstorm cannot be ruled out as well, but surface dewpoints only in the low/mid 50s F will restrict potential instability.

Pfahler

LONG TERM. (Friday Night through Wednesday) Issued at 315 AM CDT Thu Sep 23 2021

Following a very brief period of post-frontal CAA Saturday, low- level flow is anticipated to become southwesterly by Sunday, establishing an increasingly warm airmass across the Midwest. This airmass could support high temps nearing 90 F through at least the Sunday-to-Monday timeframe as 850-hPa temps flirt with 20 C. Global model guidance indicate the upper-level flow pattern will also begin to amplify substantially across North America next week as an omega block likely forms over the CONUS. However, there is disparity with regard to the exact phase of this pattern which will impact if upper- level troughing can dig into the Midwest, promoting intrusion of one or multiple backdoor cold fronts, or if upper-level ridging will prevail. These disparities become greatest by the middle of next week and will impact the degree of continued anomalous warmth beyond Monday.

Pfahler

AVIATION. (For the 18z TAFs through 18z Friday Afternoon) Issued at 1154 AM CDT Thu Sep 23 2021

A surface ridge extending from southeastern IA south through LA will move east-southeastward. Northwest winds will become light this evening, then southwesterly Friday morning. A few diurnal cumulus clouds can be expected this afternoon. There may be some river valley fog again late tonight and early Friday morning which could impact SUS, JEF and CPS.

SPECIFICS FOR KSTL: A surface ridge extending from southeastern IA south through LA will move east-southeastward. Northwest winds will become light this evening, then southwesterly Friday morning. A few diurnal cumulus clouds can be expected this afternoon.

GKS

LSX WATCHES/WARNINGS/ADVISORIES. MO . None. IL . None.

WFO LSX


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Litchfield Municipal Airport, IL17 mi33 minNW 12 G 1510.00 miPartly Cloudy66°F41°F40%1019.6 hPa
St. Louis Regional Airport, IL19 mi38 minNW 9 G 1610.00 miA Few Clouds70°F32°F25%1020 hPa

Link to 5 minute data for K3LF

Wind History from 3LF (wind in knots)
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Last 24hrN14
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NW12NW4NW4NW4NW3NW4N3NW3NW3CalmCalmW4CalmW3NW5NW6NW9W10N10
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1 day agoNW6N6N5NW8NW11NW9N6NW5N3N4NW4N5NW4NW9NW6NW3NW6NW6NW8
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2 days agoS9
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S9S8S10S11S8SE10NW7W7E8SW7E3W5N11
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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Ground Weather Radar Station




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