Alert archive / Missouri / River Flood Warnings in 2026

River Flood Warning 61, NWS St. Louis, MO

May 18, 2026Lincoln County, Missouri

NWS St. Louis, MO issued this river flood warning at May 18, 2026, 8:16 PM CDT for Lincoln County, Missouri. It took effect at May 19, 2026, 4:31 AM CDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: May 18, 2026, 8:16 PM CDT (01:16 UTC)
In effect from: May 19, 2026, 4:31 AM CDT
Expired: May 19, 2026, 8:50 PM CDT
In force: 16 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: Minor

County Lincoln County, MO

The radar

The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 01:15 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 Cuivre River at Troy (TRYM7). The gauge peaked at 22.41 ft at May 19, 2026, 6:00 AM CDT.

Action stage: 19 ft
Minor stage: 21 ft
Moderate stage: 25 ft
Major stage: 29 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05514500, 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 May 18, 7:26 PM CDT, 50 minutes earlier.

Area forecast discussion, May 18, 7:26 PM CDT, 50 minutes before

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Hazardous weather outlook, May 18, 3:55 PM CDT, 4 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service St Louis MO
355 PM CDT Mon May 18 2026

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-192100-
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-
Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO-
Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-
Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-
Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO-
Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-
Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-
Madison MO-Reynolds MO-
355 PM CDT Mon May 18 2026

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAYS ONE THROUGH SEVEN...This afternoon through Sunday.

More detailed information can be accessed at:
https://www.weather.gov/media/lsx/DssPacket.pdf

The Area Forecast Discussion is available at:
https://forecast.weather.gov/
product.php?issuedby=LSX&product=AFD&site=lsx

.KEY MESSAGES...

- Widespread showers and thunderstorms are expected throughout the
  day with heavy rainfall in some locations potentially leading to
  flash flooding.

- A few strong to severe thunderstorms are possible this afternoon
  and evening with the main hazards being hail and damaging wind
  gusts.

- Additional thunderstorms are forecast late tonight and early
  Tuesday morning with another round possible along a cold front
  Tuesday afternoon/evening.

NOTE: Starting May 29, 2026, this outlook product will be
discontinued. Please see the above products for more detailed
forecast information.

WFO LSX

In the hours before

Local storm report, May 18, 4:22 PM CDT, 3 hours 54 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
422 PM CDT Mon May 18 2026

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

0256 PM     Rain             1 WSW Truesdale         38.80N 91.14W
05/18/2026  M1.70 Inch       Warren             MO   Emergency Mngr

&&

MCF

Local storm report, May 18, 4:28 PM CDT, 3 hours 48 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
428 PM CDT Mon May 18 2026

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

0319 PM     Rain             Hannibal                39.71N 91.39W
05/18/2026  M1.80 Inch       Marion             MO   Emergency Mngr

&&

MCF

Local storm report, May 18, 4:47 PM CDT, 3 hours 29 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
447 PM CDT Mon May 18 2026

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

0440 PM     Rain             Ferguson                38.74N 90.30W
05/18/2026  M2.03 Inch       St. Louis          MO   Public

&&

MCF

Local storm report, May 18, 4:51 PM CDT, 3 hours 25 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
451 PM CDT Mon May 18 2026

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

0215 PM     Rain             Catawissa               38.42N 90.78W
05/18/2026  M1.52 Inch       Franklin           MO   Public

&&

MCF

Local storm report, May 18, 4:56 PM CDT, 3 hours 20 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
456 PM CDT Mon May 18 2026

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

0315 PM     Rain             1 SW Holts Summit       38.63N 92.13W
05/18/2026  M1.64 Inch       Callaway           MO   Public

            South side of Holts Summit.

&&

MCF

Local storm report, May 18, 8:04 PM CDT, 12 minutes before

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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 1:53 AM CDT	River Flood Warning	LSX	Cole	44 hr
May 19, 10:11 AM CDT	River Flood Warning	LSX	Franklin	58 hr
May 19, 12:13 PM CDT	River Flood Warning	LSX	Callaway, Osage	4 days
May 18, 8:17 PM CDT	Areal Flood Advisory	LSX	Marion	12 hr
May 18, 8:56 PM CDT	Areal Flood Advisory	LSX	Bond, Clinton, Fayette, Madison, Monroe, Saint Clair and 1 more	3 hr

Nearby

River Flood Warnings in Missouri, 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.