Alert archive / Illinois / Flash Flood Warnings in 2023
Flash Flood Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jun 18, 2023, 5:37 PM CDT for Madison County, Monroe County, Saint Clair County, Illinois; Jefferson County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 18, 2023, 5:37 PM CDT (22:37 UTC)
- Expired
- Jun 18, 2023, 8:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 37 km from the middle of the area, began a volume at 22:40 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 18, 5:54 PM CDT | FLASH FLOOD | 2 Ne Lemay, MO | Interstate 55 at Loughborough is closed due to deep water over roadway. |
| Jun 18, 6:18 PM CDT | FLASH FLOOD | 3 Ese Saint Louis, MO | Interstate 44 westbound is closed at Interstate 64 due to water over the roadway. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 209 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1441 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
345
WGUS53 KLSX 182237
FFWLSX
ILC119-133-163-MOC099-189-510-190130-
/O.NEW.KLSX.FF.W.0009.230618T2237Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
537 PM CDT Sun Jun 18 2023
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southwestern Madison County in southwestern Illinois...
Northwestern Monroe County in southwestern Illinois...
Northwestern Saint Clair County in southwestern Illinois...
Northeastern Jefferson County in east central Missouri...
Eastern Saint Louis County in east central Missouri...
Saint Louis City in east central Missouri...
* Until 830 PM CDT.
* At 537 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
St. Louis, Florissant, University City, Granite City, Kirkwood,
Maryland Heights, East St. Louis, Hazelwood, Webster Groves,
Ferguson, Arnold, Creve Coeur, Overland, Clayton, Cahokia,
Jennings, St. Ann, Crestwood, Bridgeton and Bellefontaine
Neighbors.
This includes the following State Parks...
Scott Joplin Historic Site, Mastodon Historic Site and Horseshoe
Lake State Park.
This includes the following highways...
Interstate 44 in Missouri between exits 276 and 277.
Interstate 55 in Missouri between exits 190 and 191.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3883 9042 3882 9037 3885 9034 3888 9034
3889 9032 3888 9029 3885 9026 3882 9018
3883 9015 3881 9012 3882 9011 3881 9007
3838 9013 3837 9047
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MRB4 follow-up statements
587
WGUS73 KLSX 182249
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
549 PM CDT Sun Jun 18 2023
ILC133-MOC099-182259-
/O.CAN.KLSX.FF.W.0009.000000T0000Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Jefferson MO-
549 PM CDT Sun Jun 18 2023
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN MONROE COUNTY
IN SOUTHWESTERN ILLINOIS AND NORTHEASTERN JEFFERSON COUNTY IN EAST
CENTRAL MISSOURI...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3882 9037 3885 9034 3888 9034 3889 9032
3888 9029 3885 9026 3882 9018 3883 9015
3881 9012 3882 9011 3881 9007 3845 9012
3846 9019 3852 9026 3848 9028 3850 9041
$$
ILC119-163-MOC189-510-190130-
/O.CON.KLSX.FF.W.0009.000000T0000Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
549 PM CDT Sun Jun 18 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS
EVENING FOR SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR
COUNTIES IN SOUTHWESTERN ILLINOIS, EASTERN SAINT LOUIS COUNTY IN
EAST CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL
MISSOURI...
At 549 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
St. Louis, Florissant, University City, Granite City, Kirkwood,
East St. Louis, Hazelwood, Webster Groves, Ferguson, Overland,
Clayton, Cahokia, Jennings, St. Ann, Crestwood, Bridgeton,
Bellefontaine Neighbors, Columbia, Berkeley and Richmond Heights.
This includes the following State Parks...
Scott Joplin Historic Site and Horseshoe Lake State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3882 9037 3885 9034 3888 9034 3889 9032
3888 9029 3885 9026 3882 9018 3883 9015
3881 9012 3882 9011 3881 9007 3845 9012
3846 9019 3852 9026 3848 9028 3850 9041
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MRB360
WGUS73 KLSX 182325
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
625 PM CDT Sun Jun 18 2023
ILC119-163-MOC189-510-190130-
/O.CON.KLSX.FF.W.0009.000000T0000Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
625 PM CDT Sun Jun 18 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS
EVENING FOR SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR
COUNTIES IN SOUTHWESTERN ILLINOIS, EASTERN SAINT LOUIS COUNTY IN
EAST CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL
MISSOURI...
At 625 PM CDT, emergency management reported thunderstorms producing
heavy rain in St. Louis. Between 1 and 3 inches of rain have fallen.
The expected rainfall rate is 1 to 2 inches in 1 hour. Additional
rainfall amounts of 1 to 2 inches are possible in the warned area.
Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported that Interstate 55 closed
in south St. Louis City due to flash flooding.
Interstate 44 is also closed at Interstate 64 in St.
Louis City due to flash flooding.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
St. Louis, Florissant, University City, Granite City, Kirkwood,
East St. Louis, Hazelwood, Webster Groves, Ferguson, Overland,
Clayton, Cahokia, Jennings, St. Ann, Crestwood, Bridgeton,
Bellefontaine Neighbors, Columbia, Berkeley and Richmond Heights.
This includes the following State Parks...
Scott Joplin Historic Site and Horseshoe Lake State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3882 9037 3885 9034 3888 9034 3889 9032
3888 9029 3885 9026 3882 9018 3883 9015
3881 9012 3882 9011 3881 9007 3845 9012
3846 9019 3852 9026 3848 9028 3850 9041
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MRB934
WGUS73 KLSX 190015
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
715 PM CDT Sun Jun 18 2023
ILC119-163-MOC189-510-190130-
/O.CON.KLSX.FF.W.0009.000000T0000Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
715 PM CDT Sun Jun 18 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM CDT THIS
EVENING FOR SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR
COUNTIES IN SOUTHWESTERN ILLINOIS, EASTERN SAINT LOUIS COUNTY IN
EAST CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL
MISSOURI...
At 715 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain in St. Louis, Missouri and eastern St. Clair County, Illinois.
Between 2 and 4 inches of rain have fallen. The expected rainfall
rate is 1 to 2 inches in 1 hour. Additional rainfall amounts up to 1
inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
St. Louis, Florissant, University City, Granite City, Kirkwood,
East St. Louis, Hazelwood, Webster Groves, Ferguson, Overland,
Clayton, Cahokia, Jennings, St. Ann, Crestwood, Bridgeton,
Bellefontaine Neighbors, Columbia, Berkeley and Richmond Heights.
This includes the following State Parks...
Scott Joplin Historic Site and Horseshoe Lake State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3882 9037 3885 9034 3888 9034 3889 9032
3888 9029 3885 9026 3882 9018 3883 9015
3881 9012 3882 9011 3881 9007 3845 9012
3846 9019 3852 9026 3848 9028 3850 9041
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MRB417
WGUS73 KLSX 190122
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
822 PM CDT Sun Jun 18 2023
ILC119-163-MOC189-510-190132-
/O.EXP.KLSX.FF.W.0009.000000T0000Z-230619T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
822 PM CDT Sun Jun 18 2023
...FLASH FLOOD WARNING WILL EXPIRE AT 830 PM CDT THIS EVENING FOR
SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS, EASTERN SAINT LOUIS COUNTY IN EAST CENTRAL
MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL MISSOURI...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3882 9037 3885 9034 3888 9034 3889 9032
3888 9029 3885 9026 3882 9018 3883 9015
3881 9012 3882 9011 3881 9007 3845 9012
3846 9019 3852 9026 3848 9028 3850 9041
$$
ElmoreThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 5:22 PM CDT | Areal Flood Advisory | LSX | Madison, Monroe, Saint Clair | 15 min |
| Jun 18, 12:05 PM CDT | Areal Flood Advisory | LSX | Boone | 3 hr |
| Jun 18, 12:37 PM CDT | Areal Flood Advisory | LSX | Boone | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 2023Flash Flood Warnings in Missouri, 2023Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.