Alert archive / Illinois / Flash Flood Warnings in 2020
Flash Flood Warning 61, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 12, 2020, 11:18 AM CDT for Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 3 hr. 4 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 12, 2020, 11:18 AM CDT (16:18 UTC)
- Expired
- Aug 12, 2020, 2:46 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 12:00 PM CDT | FLASH FLOOD | Hecker, IL | STATE HIGHWAYS 156 AND 159 FLOODED IN SPOTS, 156 BETWEEN HECKER AND WATERLOO AND 159 BETWEEN HECKER AND BELLEVILLE. |
| Aug 12, 12:00 PM CDT | FLASH FLOOD | Smithton, IL | JUST SOUTH OF THE PARK IN SMITHTON, STATE HIGHWAY 159 NEAR THE CREEK WAS FLOODED. |
| Aug 12, 12:09 PM CDT | FLOOD | Waterloo, IL | MONROE COUNTY DEPUTIES ARE EN ROUTE TO WATERLOO TO INVESTIGATE FLOODED ROADS, BUT AT THE TIME OF THE CALL THE DISPATCHER WAS UNAWARE OF ANY ROAD CLOSURES IN MONROE COUNTY. |
| Aug 12, 12:50 PM CDT | FLASH FLOOD | Maeystown, IL | ROADS AROUND MAEYSTOWN, INCLUDING MAEYSTOWN ROAD, HAVE DEBRIS LEFT ON THEM FROM THIS MORNINGS FLOODING. |
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, 4.3 hours before the alert went out and 249 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
- 1132 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
552
WGUS53 KLSX 121618
FFWLSX
ILC133-157-163-122215-
/O.NEW.KLSX.FF.W.0061.200812T1618Z-200812T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1118 AM CDT Wed Aug 12 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Monroe County in southwestern Illinois...
Northwestern Randolph County in southwestern Illinois...
Southwestern St. Clair County in southwestern Illinois...
* Until 515 PM CDT.
* At 1117 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to two inches of rain have
already fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
Belleville, Waterloo, Columbia, Freeburg, Millstadt, Red Bud,
Oakville, Smithton, New Athens, Valmeyer, Evansville, Baldwin,
Fountain, New Design, Preston, Prairie Du Rocher, Prairie, Hecker,
Barr and Ruma.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3808 8986 3809 9021 3813 9026 3816 9028
3818 9031 3822 9036 3832 9037 3839 9034
3840 9032 3844 9029 3852 9026 3848 9021
3845 8984
FLASH FLOOD...RADAR INDICATED
$$
MRM3 follow-up statements
750
WGUS73 KLSX 121720
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
1220 PM CDT Wed Aug 12 2020
ILC133-157-163-122215-
/O.CON.KLSX.FF.W.0061.000000T0000Z-200812T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Randolph IL-St. Clair IL-
1220 PM CDT Wed Aug 12 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
MONROE...NORTHWESTERN RANDOLPH AND SOUTHWESTERN ST. CLAIR COUNTIES...
At 1218 PM CDT, law enforcement reported heavy rain from
thunderstorms causing flooding along I-59 in Smithton. Up to two
inches of rain have already fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Belleville, Waterloo, Columbia, Freeburg, Millstadt, Red Bud,
Oakville, Smithton, New Athens, Valmeyer, Evansville, Baldwin,
Fountain, New Design, Preston, Prairie Du Rocher, Prairie, Hecker,
Barr and Ruma.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3808 8986 3809 9021 3813 9026 3816 9028
3818 9031 3822 9036 3832 9037 3839 9034
3840 9032 3844 9029 3852 9026 3848 9021
3845 8984
FLASH FLOOD...OBSERVED
$$
MRM572
WGUS73 KLSX 121747
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
1247 PM CDT Wed Aug 12 2020
ILC133-157-163-122215-
/O.CON.KLSX.FF.W.0061.000000T0000Z-200812T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Randolph IL-St. Clair IL-
1247 PM CDT Wed Aug 12 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
MONROE...NORTHWESTERN RANDOLPH AND SOUTHWESTERN ST. CLAIR COUNTIES...
At 1246 PM CDT, trained weather spotters reported heavy rain from
thunderstorms flooding several highways in Waterloo, Hecker, and
Smithton. Up to two inches of rain have already fallen. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained weather spotters.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Belleville, Waterloo, Columbia, Freeburg, Millstadt, Red Bud,
Oakville, Smithton, New Athens, Valmeyer, Evansville, Baldwin,
Fountain, New Design, Preston, Prairie Du Rocher, Prairie, Hecker,
Barr and Ruma.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3808 8986 3809 9021 3813 9026 3816 9028
3818 9031 3822 9036 3832 9037 3839 9034
3840 9032 3844 9029 3852 9026 3848 9021
3845 8984
FLASH FLOOD...OBSERVED
$$
MRM257
WGUS73 KLSX 121946
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
246 PM CDT Wed Aug 12 2020
ILC133-157-163-121956-
/O.CAN.KLSX.FF.W.0061.000000T0000Z-200812T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe IL-Randolph IL-St. Clair IL-
246 PM CDT Wed Aug 12 2020
...THE FLASH FLOOD WARNING FOR MONROE...NORTHWESTERN RANDOLPH AND
SOUTHWESTERN ST. CLAIR COUNTIES IS CANCELLED...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 3808 8986 3809 9021 3813 9026 3816 9028
3818 9031 3822 9036 3832 9037 3839 9034
3840 9032 3844 9029 3852 9026 3848 9021
3845 8984
$$
MRMThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 9:41 AM CDT | Flash Flood Warning | LSX | Madison, Saint Clair | 5 hr |
| Aug 12, 10:19 AM CDT | Flash Flood Warning | LSX | Madison, Saint Clair | 4 hr |
| Aug 12, 11:47 AM CDT | Flash Flood Warning | LSX | Clinton, Randolph, Saint Clair, Washington | 6 hr |
| Aug 12, 2:57 PM CDT | Areal Flood Warning | LSX | Saint Clair | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 2020Every flash flood warning in 2020
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.