# Flash Flood Warning: Louisa, IA; Mercer, IL — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/c9a2e71a6abbbf27

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-08-15 21:53 ingested 2026-08-16 06:38

[original source ↗](http://www.weather.gov/)

## extract

Flash Flood Warning — Louisa, IA; Mercer, IL
Severity: Severe. Certainty: Likely.
At 953 PM CDT, local law enforcement reported thunderstorms producing
heavy rain in Water reported over Highway 17 near New Boston, IL and
flooding on roadways in Grandview, IA. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts under a quarter inch are
anticipated 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.

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.