Alert archive / Missouri / Flood Watches in 2023

Flood Watch 10, NWS St. Louis, MO

August 4, 202315 counties in Missouri; 4 counties in Illinois

NWS St. Louis, MO issued this flood watch at Aug 4, 2023, 2:00 PM CDT for 15 counties in Missouri; 4 counties in Illinois. It took effect at Aug 4, 2023, 7:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 4, 2023, 2:00 PM CDT (19:00 UTC)
In effect from: Aug 4, 2023, 7:00 PM CDT
Expired: Aug 5, 2023, 4:01 AM CDT
In force: 9 hr
Issued by: NWS St. Louis, MO
Flood severity: None

Counties Adams County, IL, Brown County, IL, Calhoun County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 109 km from the middle of the area, began a volume at 19:03 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.

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at Aug 4, 1:05 PM CDT, 55 minutes earlier.

Area forecast discussion, Aug 4, 1:05 PM CDT, 55 minutes before

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Hazardous weather outlook, Aug 4, 4:08 AM CDT, 9 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service St Louis MO
408 AM CDT Fri Aug 4 2023

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-050915-
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-
408 AM CDT Fri Aug 4 2023

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

.DAY ONE...Today and tonight.

Thunderstorms will continue across portions of central and southeast
Missouri and southwest Illinois into early Friday morning. Locally
heavy rainfall with the storms could produce flash flooding. A few
storms could also be severe with damaging winds and large hail as the
main threats.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Thunderstorms are possible each day through late Sunday, and a few of
these storms could become strong or severe. There is another chance
of thunderstorms on Wednesday and Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

19

In the hours before

Local storm report, Aug 4, 8:48 AM CDT, 5 hours 12 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
848 AM CDT Fri Aug 4 2023

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

0416 AM     Tstm Wnd Dmg     2 NE Buckhorn           37.36N 90.28W
08/04/2023                   Madison            MO   Public

            County dispatch reported trees down across
            Highway M near CR 301. Time estimated from
            radar.

&&

AE

Local storm report, Aug 4, 8:49 AM CDT, 5 hours 11 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
849 AM CDT Fri Aug 4 2023

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

0416 AM     Tstm Wnd Dmg     2 NE Buckhorn           37.36N 90.28W
08/04/2023                   Madison            MO   Law Enforcement

            Corrects previous tstm wnd dmg report from 2
            NE Buckhorn. County dispatch reported trees
            down across Highway M near CR 301. Time
            estimated from radar.

&&

AE

Local storm report, Aug 4, 9:45 AM CDT, 4 hours 15 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
945 AM CDT Fri Aug 4 2023

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

0700 AM     Rain             Viburnum                37.72N 91.13W
08/04/2023  M2.12 inch       Iron               MO   CO-OP Observer

&&

JPG

Local storm report, Aug 4, 9:50 AM CDT, 4 hours 10 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
950 AM CDT Fri Aug 4 2023

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

0845 AM     Flash Flood      2 NE Buckhorn           37.36N 90.27W
08/04/2023                   Madison            MO   Law Enforcement

            County dispatch reported water over Highway
            M near CR 301 earlier.

&&

AE

Local storm report, Aug 4, 9:51 AM CDT, 4 hours 9 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
951 AM CDT Fri Aug 4 2023

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

0454 AM     Rain             3 S Hermann             38.66N 91.43W
08/04/2023  M2.09 inch       Gasconade          MO   Cocorahs

&&

JPG

Local storm report, Aug 4, 9:54 AM CDT, 4 hours 6 minutes before

Preliminary Local Storm Report
National Weather Service St Louis MO
954 AM CDT Fri Aug 4 2023

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

0412 AM     Tstm Wnd Dmg     4 ESE Saco              37.35N 90.38W
08/04/2023                   Madison            MO   Utility Company

            Black River Electric COOP has several broken
            poles in the southern half of Madison County
            and numerous outages. Time estimated from
            radar.

&&

AE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 7:04 PM CDT	Flood Watch	LSX	Boone, Callaway, Cole, Crawford, Franklin, Gasconade and 9 more	14 hr
Aug 4, 2:57 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	2 hr
Aug 4, 3:23 AM CDT	Flash Flood Warning	LSX	Osage	4 hr
Aug 4, 3:56 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	49 min
Aug 4, 4:34 AM CDT	Areal Flood Advisory	LSX	Madison	82 min
Aug 4, 5:56 AM CDT	Flash Flood Warning	LSX	Madison	4 hr
Aug 4, 7:27 AM CDT	Areal Flood Warning	LSX	Osage	2 hr
Aug 4, 10:05 AM CDT	River Flood Warning	LSX	Franklin, Jefferson	3 days

Nearby

Flood Watches in Missouri, 2023 Flood Watches in Illinois, 2023 Every flood watch in 2023

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.