Alert archive / Missouri / Flood Watches in 2025

Flood Watch 5, NWS St. Louis, MO

July 20, 202519 counties in Missouri; 15 counties in Illinois

NWS St. Louis, MO issued this flood watch at Jul 20, 2025, 1:44 AM CDT for 19 counties in Missouri; 15 counties in Illinois. It took effect at Jul 20, 2025, 2:00 AM CDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 2025, 1:44 AM CDT (06:44 UTC)
In effect from: Jul 20, 2025, 2:00 AM CDT
Expired: Jul 21, 2025, 10:19 AM CDT
In force: 32 hr
Issued by: NWS St. Louis, MO
Flood severity: None

All 34 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Pike County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, 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, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 50 km from the middle of the area, began a volume at 06:46 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.7 hours before the alert went out and 280 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 783 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1060 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

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 Jul 19, 10:41 PM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, Jul 19, 10:41 PM CDT, 3 hours 3 minutes before

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Hazardous weather outlook, Jul 19, 3:25 PM CDT, 10 hours 19 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
Jul 20, 6:23 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	25 min

Nearby

Flood Watches in Missouri, 2025 Flood Watches in Illinois, 2025 Every flood watch in 2025

Sources

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