Alert archive / Missouri / Flood Watches in 2022

Flood Watch 6, NWS St. Louis, MO

August 3, 202217 counties in Missouri; 13 counties in Illinois

NWS St. Louis, MO issued this flood watch at Aug 3, 2022, 1:45 PM CDT for 17 counties in Missouri; 13 counties in Illinois. It took effect at Aug 3, 2022, 4:34 PM CDT. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued
Aug 3, 2022, 1:45 PM CDT (18:45 UTC)
In effect from
Aug 3, 2022, 4:34 PM CDT
Expired
Aug 4, 2022, 10:00 AM CDT
In force
17 hr
Issued by
NWS St. Louis, MO
Flood severity
None
All 30 counties

Bond County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Moniteau County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 34 km from the middle of the area, began a volume at 18:44 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

Lincoln, IL (KILX), launched 12:00Z, 6.8 hours before the alert went out and 247 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2022-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2195 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2022-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2195 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
1299 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
-13 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 3, 6:57 AM CDT, 6 hours 48 minutes earlier.

Area forecast discussion, Aug 3, 6:57 AM CDT, 6 hours 48 minutes before
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Hazardous weather outlook, Aug 3, 5:32 AM CDT, 8 hours 13 minutes before
Hazardous Weather Outlook
National Weather Service St Louis MO
532 AM CDT Wed Aug 3 2022

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-041200-
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-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-
532 AM CDT Wed Aug 3 2022

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.

Hot and humid conditions will continue to produce heat index values
around 105 degrees this afternoon. A heat advisory continues for all
but northeast Missouri and a part of west central Illinois.

Thunderstorms are expected to develop over northeast Missouri and
west central Illinois this afternoon, and move southeast across the
area through the evening and overnight. Some of the storms could be
severe, primarily late this afternoon and evening. Damaging winds
are the primary threat, and large hail is also possible. Locally
heavy rainfall is expected with these storms, particularly across
parts of southeast and east central Missouri into southwest Illinois.
This could lead to isolated flash flooding in these areas.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The chance for thunderstorms continues Thursday through Friday, and
returns again on Sunday through Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon and tonight.

Carney

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 2:27 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren48 min
Aug 3, 3:04 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles41 min
Aug 3, 3:12 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Charles, Warren34 min
Aug 3, 3:21 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis26 min
Aug 3, 3:28 PM CDTAreal Flood AdvisoryLSXWarren3 hr
Aug 3, 3:36 PM CDTSevere Thunderstorm WarningLSXFranklin26 min
Aug 3, 3:49 PM CDTSevere Thunderstorm WarningLSXCallaway, Osage24 min
Aug 3, 4:29 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis46 min
Aug 3, 4:49 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Washington41 min
Aug 3, 5:16 PM CDTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve, Saint Francois44 min
Aug 3, 5:41 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois64 min
Aug 3, 3:13 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery47 min
Aug 3, 3:45 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey45 min
Aug 3, 4:12 PM CDTSevere Thunderstorm WarningLSXMacoupin48 min
Aug 3, 4:22 PM CDTSevere Thunderstorm WarningLSXGreene, Jersey21 min
Aug 3, 4:42 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery36 min
Aug 3, 5:05 PM CDTSevere Thunderstorm Warning Considerable damage threatLSXMadison, Saint Clair40 min
Aug 3, 5:15 PM CDTAreal Flood AdvisoryLSXMacoupin, Montgomery3 hr
Aug 3, 5:34 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Madison, Montgomery, Saint Clair and 1 more41 min
Aug 3, 5:54 PM CDTAreal Flood AdvisoryLSXBond, Fayette, Montgomery3 hr
Aug 3, 6:15 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion, Washington60 min
Aug 3, 6:50 PM CDTSevere Thunderstorm WarningLSXMarion40 min

Nearby

Flood Watches in Missouri, 2022Flood Watches in Illinois, 2022Every flood watch in 2022

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.