Lower Mississippi Valley
Sunday, August 23, 2026 · 11:48 AM
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Drier with cooler evening and overnight periods through Tuesday. Fog is possible across the river valleys each morning. Low to medium rain and storm chances, mainly mid week, with seasonal temperatures that continue into next weekend. Water vapor imagery, check the screen! Cleanest air mass that you have ever seen! Front moved through late Sunday night, Swept the muggy chaos out of sight! High pressure shifting to the north right now, Cooler overnights, take a bow! No mentionable rain in the short-term grid, Shutting down the moisture, lock the lid! Broad area of dry air aloft, Cool evening air landing soft, River valley fog in the morning light, Holding stable conditions tight! Ridging out west, troff in the east! Waiting on the mid-week convection beast! Moisture creeping from the southern alley, Creeping from the Lower Mississippi Valley! Ensembles suggest little change in the trend, Mid-level flow gonna flex and bend! Passing shortwaves progged in the mid-week slot, Will it trigger severe or will it not? Modest flow aloft, coverage might grow, Lower Mississippi Valley starts to flow! Background pattern locked in place, Seasonal norms in a quiet space! ZERO! Troff moving east! Moisture return! No rain today! Let the atmosphere burn! River valley fog in the morning haze! Seasonal temperatures for days! Drier air. Cooler nights. Holding stable. Lower Mississippi Valley.
The forecast discussion
NEW SHORT TERM, LONG TERM
KEY MESSAGES
Updated at 1133 AM CDT Sun Aug 23 2026
- Drier with cooler evening and overnight periods through Tuesday.
Fog is possible across the river valleys each morning.
- Low to medium rain and storm chances, mainly mid week, with seasonal temperatures that continue into next weekend.
SHORT TERM
(Rest of today through Monday) Issued at 1145 AM CDT Sun Aug 23 2026
Water vapor imagery shows a broad area of drier air aloft and northwesterly flow across the region and we finally got a taste of cooler, drier air this morning behind the front that moved through last night.
This is a welcomed air mass which will promote continued stable conditions and cooler evenings and overnights through Monday as high pressure moves to our north.
We currently do not have any mentionable rain chances through the short-term as a result.
LONG TERM
(Monday Night through next Sunday) Issued at 1145 AM CDT Sun Aug 23 2026
Medium-range guidance and ensembles suggest little change in the background weather pattern through the upcoming week.
Generally speaking, ridging will remain out west with a trough across the east.
However, the trough should slowly move east mid to late week which will allow for a bit of moisture return from the Lower Mississippi Valley.
This will foster showers and a few thunderstorms mid week.
Better coverage of convection is possible with passing shortwaves progged during this timeframe and we'll have to see if we get any severe weather since we'll remain in modest mid-level flow.
Too early to tell right now.
Overall the temperature forecast is pretty close to seasonal norms mid to late week and guidance is on the drier side late week into next weekend.