Marine Weather and Tide Forecast for Barry, IL

SHORT TERM /THROUGH WEDNESDAY NIGHT/
Issued at 158 PM CDT Tue Jun 23 2026

Today and Tonight: Latest surface analysis revealed high pressure centered over the Great Lakes and extending south across eastern Missouri. PWATs this morning are less than 1.00” (or near the 25th percentile for this time of year), which has allowed for mostly clear skies across the area. The one exception to this is near Columbia where some cumulus have formed and that are on the edge of the higher moisture gradient.
Expect highs today in the upper 70s to lower 80s. Tonight, surface high pressure will slide east of the region with lows generally in the lower 60s. No precipitation is expected.

Wednesday: Surface high pressure will be located over the Ohio River Valley with southerly flow over Missouri and western Illinois. At 250 mb, a weak jet streak (70 - 80kt) is forecast to traverse Kansas and Missouri ahead of a stronger shortwave over southern Canada. An approaching cold front from the northwest working in tandem with the jet streak will provide more than sufficient lift. PWATs rise to around 1.5” with sufficient instability (MLCAPE around 1000 J/kg). The highest instability will be across our northwestern and western zones, or closer to the deeper moisture and better lapse rates. This is also where the highest chance of thunderstorms (20 - 50%) exist tomorrow, closer to Columbia, MO. Thunderstorms across the western zones will then start to wane Wednesday night into Thursday morning as we lose afternoon heating and the convergent side of an upper level jet streak moves overhead.

LONG TERM /THURSDAY THROUGH TUESDAY/
Issued at 158 PM CDT Tue Jun 23 2026

Thursday and Friday: In the mid-levels of the atmosphere, a shortwave will rotate southeast over the Great Lakes with a surface cold front stalled across central Missouri. At 250 mb, the 100 - 120 kt jet streak will progress eastward allowing the region to fall in the RRQ. Simultaneously, at 500 mb a shortwave will eject east across Kansas along the stationary front.
Widespread showers and thunderstorms (70 - 90%) are forecast with the potential for heavy rainfall. This is due to multiple rounds of training thunderstorms possible. Taking a look at WPC cluster analysis, reveals that models are in fairly good agreement that heavy rainfall will likely fall from Thursday into Friday somewhere across the state of Missouri. A majority of CMC/ GEPS members show the heaviest QPF over central Missouri, while the EPS is slightly further south and the GEFS is generally slightly further north. Storm total rainfall of 1 - 3” with locally higher amounts of precipitation is possible and dependent upon the track of the mid-level low and stationary front. WPC currently has the area in a slight risk for excessive rainfall. A Flood Watch might be required.

Saturday- Monday: Precipitation will slowly come to an end from west to east as the stationary front washes out and heads north.
Over the western United States, a deepening closed low will allow heights to rapidly rise over the central United States. As such, high temperatures will begin to warm on Saturday. By Sunday into Monday, mid-level heights will rise to around 595 dm with highs in the mid 90s. Dewpoints will also be in the 70s, with heat index values well into the triple digits. Heat products might be required starting Sunday and continuing into Monday.

AVIATION /00Z TAFS THROUGH 06Z THURSDAY/
Issued at 621 PM CDT Tue Jun 23 2026

VFR conditions will prevail through the TAF period. Isolated to scattered showers and thunderstorms are in the forecast for most locations tomorrow, with the highest confidence in impacts residing in Mid-Missouri. Even then, confidence in timing or existence of direct impacts is low, so only added PROB30s at these terminals. If a site does take a direct hit, expect vsbys to briefly drop to MVFR.

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