Marine Weather and Tide Forecast for Hettick, IL

SHORT TERM
(Through Late Friday Night)
Issued at 244 PM CDT Thu Mar 19 2026

Relatively quiet weather with well above normal temperatures will prevail through Friday as the Mid Mississippi Valley falls under the influence of a strong upper level ridge centered over Arizona.
Southwest to westerly flow tonight and Friday will continue to increase temperatures by 5 to 7 degrees with lows tonight mainly in the mid 40s to around 50. Guidance is showing less cloud cover on Friday so expect strong insolation and the warmer start to the morning to push temperatures into the upper 70s to mid 80s. A weak cold front tries to push through the area Friday night, however latest guidance shows it becoming oriented along the Mississippi River before 12Z Saturday. Areas to the west of the front only cool to the low to mid 50s with upper 40s to the north and east.

Carney

LONG TERM
(Saturday through Next Thursday)
Issued at 244 PM CDT Thu Mar 19 2026

Little change to the weather occurs on Saturday with southerly flow and strong sunshine warming temperatures into the upper 70s and low 80s across the region. The next upstream mid level short wave moves off the Rockies into the Plains by early Sunday morning which pushes the surface low into the Midwest by 12Z. Guidance continues to narrow down the window when the front will pass through the area with the latest runs pushing it into northeast Missouri around 18Z and through the rest of the area by 00Z or shortly thereafter. This will give the majority of the area all morning and at least part of the afternoon to warm up. NBM highs range from the mid 70s in northeast Missouri to the mid 80s along the Missouri river and southwest Illinois up to around 90 across the eastern Ozarks.
Confidence in these temperatures varies across the area as guidance members still show variability with the speed of the front.
Temperature IQRs across the eastern Ozarks are only around 3 degrees while they jump to 8 degrees in east central Missouri, and up to 10- 13 degrees in northeast Missouri and west central Illinois. The majority of deterministic and ensemble guidance continues to show the front moving through with no precipitation, and forecast soundings show a strong low level inversion and deep mixing in the afternoon ahead of the front which supports a dry FROPA.

Strong high pressure builds into the Midwest Sunday night into Monday. This brings temperatures back down to near seasonal normals for Monday and Tuesday. The NBM temperature IQRs are around 6-8 degrees both days indicating some uncertainty, although the spreads are tighter than Sunday in most locations. The GFS has been moving a mid level short wave through the Mississippi Valley with some rain in the warm advection ahead of it for much of Missouri for the past couple of runs. However the GFS looks like a far outlier among the guidance with the ECMWF staying dry and the vast majority of the LREF members also showing no precip. Temperatures warm back above normal for Wednesday and Thursday, although current indications are that it won't be nearly as warm as tomorrow through Sunday.
Additionally there are early indications of another cold front passage Thursday which would actually push temperatures back to near or possibly below normal.

Carney

AVIATION
(For the 00z TAFs through 00z Friday Evening)
Issued at 620 PM CDT Thu Mar 19 2026

Mainly dry and VFR conditions are expected through the period.
Light winds will turn out of the southwest on Friday morning and then shift out of the northwest on afternoon. Winds will remain around 10 knots or less.

Britt

CLIMATE
Issued at 242 AM CDT Thu Mar 19 2026

Record Highs at STL/COU/UIN for 3/19-3/22 STL COU UIN 3/19 84 (1907) 81 (2012) 80 (2012)
3/20 86 (2017) 84 (2017) 81 (2012)
3/21 90 (1907) 92 (1907) 88 (1907)
3/22 88 (1907) 90 (1910) 84 (1907)



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