⚠️ Flash Flood Warning – Louisa, IA; Mercer, IL – Saturday, August 15, 2026

Flash Flood Warning issued August 15 at 9:23PM CDT until August 16 at 3:30AM CDT by NWS Quad Cities IA IL

Details

FFWDVN

The National Weather Service in Quad Cities has issued a

* Flash Flood Warning for…
Southeastern Louisa County in southeastern Iowa…
Western Mercer County in northwestern Illinois…

* Until 330 AM CDT Sunday.

* At 923 PM CDT, local law enforcement reported thunderstorms
producing heavy rain in Water reported over Highway 17. Between 1
and 2 inches of rain have fallen. Additional rainfall amounts of
0.25 to 0.5 inches are possible in the warned area. Flash flooding
is already occurring.

HAZARD…Flash flooding caused by thunderstorms.

SOURCE…Law enforcement reported.

IMPACT…Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.

* Some locations that will experience flash flooding include…
Aledo, Wapello, Millersburg, New Boston, Grandview, Eliza, Joy,
Mannon, Toolesboro, Hamlet, Petersville, Snively Access Campground,
Flaming Prairie Park, Marston, Mercer County Fairgrounds, Aledo
Mercer County Airport and Gingle Corners.

Instructions

Turn around, don’t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.