Marine Weather and Tide Forecast for Huey, IL

SHORT TERM /THROUGH FRIDAY/
Issued at 214 PM CDT Thu Sep 10 2026

While widespread rain has largely ended across the region, the main focus of the next couple of days will be the lingering potential for a few afternoon showers, both today and tomorrow, as a weak cold front stalls along our southern fringes. Fog is also expected to develop in many areas overnight, perhaps becoming dense at times, although confidence in the distribution of fog vs low clouds is relatively low.

A narrow corridor of light showers remnant of this morning's rain has been slowly moving east throughout the day today, producing only very light amounts that may not even be enough to wet the ground in most places. However, widespread cloud cover HAS persisted, and while humidity remains high, this cloud cover has significantly limited afternoon heating and prevented the buildup of substantial instability north of I-44. Across the Ozarks and further south, though, more sun has allowed for the generation of between 250 and 500 J/kg of ML CAPE, with even some modest effective bulk shear in place as well (35-45kt). As the afternoon wears on, the aforementioned cold front will continue to slowly move southeast, and convective initiation is likely by the time we reach peak heating (3-5pm). Most of this is expected to occur just to our southeast, but may briefly skirt our forecast area before quickly exiting. These storms may eventually become strong or even severe, but this is much more likely after they have moved out of the area.
Further north, a few weaker showers may also develop behind the cold front, but much weaker instability should prevent these from becoming particularly threatening.

Overnight, light winds, slowly clearing skies, and lingering humidity/surface moisture should allow for the development of fog and low clouds, with best chances for the former across northeast/central MO and west-central IL where skies clear earlier.
As you progress further south, low clouds become more likely to occur than fog, but exactly where this transition occurs is uncertain. Some dense (<1/4 mile) fog is also well within reason, but we will refrain from issuing any Dense Fog headlines until we have higher confidence in the coverage of fog vs stratus. For tomorrow, the previously mentioned cold front is expected to wash out, and surface winds will gradually turn back to the southeast.
This should allow for a very modest warmup, and will also maintain relatively high humidity levels throughout the area. As such, it would not be a surprise to see a few showers in the afternoon, particularly along/south of I-44 in closer proximity to a weak upper level trough stalled across the lower Mississippi River Valley.
Aside from a brief heavy downpour and a stray strike of lightning or two, this activity is not expected to be strong or severe.

LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/
Issued at 214 PM CDT Thu Sep 10 2026

Confidence in the day-to-day specifics remains relatively low from Saturday onward, although we do expect temperatures to climb back to slightly above average through early next week (for the most part), followed by a cooling trend toward mid-week. Precipitation chances are also rather nebulous during this timeframe, with sporadic opportunities for showers between Saturday and Monday, followed by expanding probabilities Tuesday onward as a cold front approaches.

Saturday through Monday, zonal to slightly northwesterly upper level flow will persist, with a weakness in the upper ridge lingering just to our southeast. Humidity will persist locally, but very few local forcing mechanisms are depicted in model guidance. Further west across the central plains, though, it does appear that a persistent low-level jet will drive the development of one or more convective, with relatively low confidence in their exact placement and trajectory. While the focus of this activity is expected to remain to our west, remnants of these storms may graze our far western areas at times, and the lingering humidity may be enough for us to see a few locally developing showers at times, too. Again, timing and placement is very uncertain, but areas of central/western MO are favored with the highest precipitation probabilities (~30%). Much more dry time is expected overall, though, and we don't see substantial opportunity for strong/severe storms locally. Meanwhile, above average temperatures are favored, along with high humidity, but not likely enough of either to produce headline-worthy heat index values on a large scale. A weak cold front also adds an element of uncertainty to the temperature forecast Monday, particularly north of I-70.

From Tuesday onward, there are indications that a stronger shortwave will begin to suppress the upper ridge across the central CONUS, although variance among ensembles and ensemble clusters remains very high. Both the timing and strength of this trough are very uncertain, with differences of as much as 24 hours evident among clusters, along with significant differences in strength. As such, the timing of a cold front and its resulting impacts also remains uncertain, although a cooling trend does appear likely over the latter half of the week. Given the above, temperature spreads remain high throughout this period, with 10-15 degree interquartile ranges Tuesday onward, albeit with a slow downward trend. Meanwhile, precipitation chances also gradually increase during this period, but again with very high variance among ensemble members. In short, slowly cooling temperatures are most likely Tuesday onward, with increasing chances for showers and thunderstorms overall.

AVIATION /00Z TAFS THROUGH 06Z SATURDAY/
Issued at 601 PM CDT Thu Sep 10 2026

Winds are diminishing behind a cold front with plenty of clouds passing through the area this evening. Some patches of MVFR ceilings will be observed at times this evening. If clouds clear, then we will likely see areas of fog develop overnight considering plenty of low level moisture still around and nearly calm winds. However, the uncertainty is around whether those clouds clear out or not. Latest trends show greater confidence in clearing in the north, where Quincy has the best chance at fog tonight. Central Missouri locations also have a chance of clearing out and seeing fog develop. The St Louis area is more likely to remain in the clouds, preventing more widespread fog.
However, even here there may be breaks in the clouds long enough to produce local fog. Any overnight fog will disperse by mid morning giving way to mostly VFR conditions through the day on Friday with light winds.

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