Alert archive / Missouri / Flash Flood Warnings in 2021
Flash Flood Warning 40, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 30, 2021, 2:54 PM CDT for Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 3 hr. 7 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
- Aug 30, 2021, 2:54 PM CDT (19:54 UTC)
- Expired
- Aug 30, 2021, 6:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 37 km from the middle of the area, began a volume at 19:54 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 |
|---|---|---|---|
| Aug 30, 3:00 PM CDT | HEAVY RAIN 2.6 | 1 Sse Saint Louis, MO | 2.6 INCHES OF RAIN OVER THE PAST HOUR. |
| Aug 30, 3:15 PM CDT | HEAVY RAIN 1.51 | Crestwood, MO | 1.5 INCHES OF WATER FELL IN CRESTWOOD OVER THE COURSE OF 1 HOUR. |
| Aug 30, 3:20 PM CDT | FLASH FLOOD | 1 Ene Glendale, MO | MOVING WATER COVERING THE ROADWAY, VIDEO SHOWS WATER APPROXIMATELY 6 INCHES DEEP. |
| Aug 30, 3:23 PM CDT | FLASH FLOOD | Saint Louis, MO | WATER COVERING THE ROADWAY AT THE 3900 BLOCK OF LINDELL BLVD. |
| Aug 30, 3:30 PM CDT | FLASH FLOOD | 2 E Saint Louis, MO | PICTURE OF AROUND TWO FEET OF WATER UP TO THE FRONT DOORS OF KIPP HIGH SCHOOL. |
| Aug 30, 3:46 PM CDT | FLASH FLOOD | 1 Se Saint Louis, MO | VIDEO SHOWING SEVERAL FEET OF WATER INUNDATING AN EXTENDED PORTION OF CHOUTEAU AVE. |
| Aug 30, 4:25 PM CDT | HEAVY RAIN 1.57 | 2 Ssw Saint Louis, MO | 1.57 INCHES OF STORM TOTAL RAINFALL MEASURED AT MO BOTANICAL GARDENS (MBGM7) SO FAR. |
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, 7.9 hours before the alert went out and 236 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
- 295 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.7
The text
As transmitted.
864
WGUS53 KLSX 301954
FFWLSX
ILC119-163-MOC189-510-302300-
/O.NEW.KLSX.FF.W.0040.210830T1954Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
254 PM CDT Mon Aug 30 2021
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southwestern Madison County in southwestern Illinois...
Northwestern Saint Clair County in southwestern Illinois...
South Central Saint Louis County in east central Missouri...
Saint Louis City in east central Missouri...
* Until 600 PM CDT.
* At 254 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. 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, University City, Granite City, Kirkwood, East St.
Louis, Collinsville, Webster Groves, Arnold, Clayton, Cahokia,
Crestwood, Richmond Heights, Ladue, Sunset Hills, Des Peres,
Brentwood, Maplewood, Valley Park, Shrewsbury and Glendale.
This includes the following State Parks...
Scott Joplin Historic Site and Horseshoe Lake State Park.
This includes the following highways...
Interstate 44 in Missouri between exits 276 and 277.
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 3841 9032 3843 9035 3844 9035 3845 9034
3846 9036 3845 9038 3848 9042 3848 9041
3849 9041 3850 9041 3850 9046 3852 9048
3861 9043 3879 9010 3864 9005 3849 9023
3852 9026 3844 9029
FLASH FLOOD...RADAR INDICATED
$$
KD2 follow-up statements
733
WGUS73 KLSX 302022
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
322 PM CDT Mon Aug 30 2021
ILC119-163-MOC189-510-302300-
/O.CON.KLSX.FF.W.0040.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
322 PM CDT Mon Aug 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM CDT THIS EVENING
FOR SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS, SOUTH CENTRAL SAINT LOUIS COUNTY IN EAST
CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL MISSOURI...
At 322 PM CDT, The public reported thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public reported flash flooding in downtown St. Louis and
in Webster Groves.
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, University City, Granite City, Kirkwood, East St.
Louis, Collinsville, Webster Groves, Arnold, Clayton, Cahokia,
Crestwood, Richmond Heights, Ladue, Sunset Hills, Des Peres,
Brentwood, Maplewood, Valley Park, Shrewsbury and Glendale.
This includes the following State Parks...
Scott Joplin Historic Site and Horseshoe Lake State Park.
This includes the following highways...
Interstate 44 in Missouri between exits 276 and 277.
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 3841 9032 3843 9035 3844 9035 3845 9034
3846 9036 3845 9038 3848 9042 3848 9041
3849 9041 3850 9041 3850 9046 3852 9048
3861 9043 3879 9010 3864 9005 3849 9023
3852 9026 3844 9029
FLASH FLOOD...OBSERVED
$$
KD234
WGUS73 KLSX 302251
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
551 PM CDT Mon Aug 30 2021
ILC119-163-MOC189-510-302301-
/O.EXP.KLSX.FF.W.0040.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madison IL-Saint Clair IL-Saint Louis MO-Saint Louis City MO-
551 PM CDT Mon Aug 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM CDT THIS EVENING FOR
SOUTHWESTERN MADISON AND NORTHWESTERN SAINT CLAIR COUNTIES IN
SOUTHWESTERN ILLINOIS, SOUTH CENTRAL SAINT LOUIS COUNTY IN EAST
CENTRAL MISSOURI AND THE SAINT LOUIS CITY IN EAST CENTRAL MISSOURI...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3841 9032 3843 9035 3844 9035 3845 9034
3846 9036 3845 9038 3848 9042 3848 9041
3849 9041 3850 9041 3850 9046 3852 9048
3861 9043 3879 9010 3864 9005 3849 9023
3852 9026 3844 9029
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 2:38 PM CDT | Areal Flood Advisory | LSX | Jefferson, Saint Louis, City of Saint Louis | 3 hr |
| Aug 30, 4:04 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis | 3 hr |
| Aug 30, 1:53 PM CDT | Areal Flood Advisory | LSX | Fayette, Marion | 3 hr |
| Aug 30, 4:10 PM CDT | Areal Flood Advisory | LSX | Montgomery | 3 hr |
| Aug 30, 5:40 PM CDT | Areal Flood Advisory | LSX | Randolph | 3 hr |
| Aug 30, 6:22 PM CDT | Areal Flood Advisory | LSX | Clinton, Marion | 3 hr |
Nearby
Flash Flood Warnings in Missouri, 2021Flash Flood Warnings in Illinois, 2021Every flash flood warning in 2021
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.