Alert archive / Missouri / River Flood Warnings in 2026

River Flood Warning 100, NWS St. Louis, MO

June 21, 2026Pike County, Missouri; Calhoun County, Illinois

NWS St. Louis, MO issued this river flood warning at Jun 21, 2026, 9:46 PM CDT for Pike County, Missouri; Calhoun County, Illinois. It took effect at Jun 22, 2026, 5:00 AM CDT. It was in force for 56 hr.

The area

The counties it named.

The facts

Issued: Jun 21, 2026, 9:46 PM CDT (02:46 UTC)
In effect from: Jun 22, 2026, 5:00 AM CDT
Expired: Jun 24, 2026, 12:48 PM CDT
In force: 56 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: Minor

Counties Calhoun County, IL, Pike County, MO

The radar

The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 02:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Mississippi River at Clarksville Lock and Dam 24 (CLKM7).

Action stage: 23 ft
Minor stage: 25 ft
Moderate stage: 31 ft
Major stage: 33 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this river flood warning went out at Jun 21, 6:53 PM CDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jun 21, 6:53 PM CDT, 2 hours 53 minutes before

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In the hours before

Local storm report, Jun 21, 4:41 PM CDT, 5 hours 5 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
441 PM CDT Sun Jun 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0438 PM     Tornado          2 E Alma                38.73N 88.87W
06/21/2026                   Marion             IL   Emergency Mngr

            Emergency manager reported a funnel. Passed
            along a report from firemen saying tornado
            on the ground headed east toward Forbes
            State Park.

&&

LSJ

Local storm report, Jun 21, 5:14 PM CDT, 4 hours 32 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
514 PM CDT Sun Jun 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0511 PM     Funnel Cloud     3 W Saint Paul          38.85N 89.01W
06/21/2026                   Fayette            IL   Broadcast Media

            Report of funnel cloud from Fox 2 Storm
            Runner broadcast.

&&

LSJ

Local storm report, Jun 21, 5:19 PM CDT, 4 hours 27 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
519 PM CDT Sun Jun 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0511 PM     Tornado          3 W Saint Paul          38.85N 89.01W
06/21/2026                   Fayette            IL   Broadcast Media

            Corrects previous funnel cloud report from 3
            W Saint Paul. Report of funnel cloud from
            Fox 2 Storm Runner broadcast. Funnel
            reportedly touched ground briefly.

&&

LSJ

Local storm report, Jun 21, 5:35 PM CDT, 4 hours 11 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
535 PM CDT Sun Jun 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0526 PM     Tornado          2 NNE Vernon            38.82N 89.08W
06/21/2026                   Marion             IL   Broadcast Media

            Fox 2 Storm Runner caught brief touchdown
            about 1 mile north of Vernon just east of
            Hwy 51.

&&

LSJ

Local storm report, Jun 21, 6:35 PM CDT, 3 hours 11 minutes before

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Local storm report, Jun 21, 6:37 PM CDT, 3 hours 9 minutes before

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Nearby

River Flood Warnings in Missouri, 2026 River Flood Warnings in Illinois, 2026 Every river flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.