Alert archive / Illinois / Flash Flood Warnings in 2020
Flash Flood Warning 42, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 19, 2020, 9:03 PM CDT for 4 counties in Illinois. It was in force for 6 hr. 1 report 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
- Jul 19, 2020, 9:03 PM CDT (02:03 UTC)
- Expired
- Jul 20, 2020, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Marion County, IL
The radar
The St Louis radar (KLSX), 121 km from the middle of the area, began a volume at 02:07 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 |
|---|---|---|---|
| Jul 19, 10:39 PM CDT | HEAVY RAIN 2.7 | Aviston, IL |
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 00:00Z, 2.1 hours before the alert went out and 182 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
- 1662 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
806
WGUS53 KLSX 200203
FFWLSX
ILC005-027-051-121-200800-
/O.NEW.KLSX.FF.W.0042.200720T0203Z-200720T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
903 PM CDT Sun Jul 19 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Clinton County in south central Illinois...
Southern Bond County in south central Illinois...
Marion County in south central Illinois...
Southern Fayette County in south central Illinois...
* Until 300 AM CDT.
* At 901 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 1 to 2 inches of rain have
fallen between 7:30 and 9 PM CDT. 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...
Centralia, Salem, Vandalia, Greenville, Breese, New Baden, Carlyle,
Trenton, Aviston, St. Elmo, St. Rose, Sandoval, Germantown, Albers,
Wamac, Central City, Odin, Beckemeyer, Kinmundy and Pocahontas.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
This also includes Carlyle Lake Recreational Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 3847 8914 3850 8915 3852 8936 3850 8937
3850 8943 3847 8948 3847 8961 3843 8968
3848 8971 3865 8971 3866 8959 3884 8960
3908 8881 3891 8881 3891 8869 3847 8870
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
TES1 follow-up statement
514
WGUS73 KLSX 200800
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
300 AM CDT Mon Jul 20 2020
ILC005-027-051-121-200809-
/O.EXP.KLSX.FF.W.0042.000000T0000Z-200720T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clinton IL-Bond IL-Marion IL-Fayette IL-
300 AM CDT Mon Jul 20 2020
...THE FLASH FLOOD WARNING FOR CLINTON...SOUTHERN BOND...MARION AND
SOUTHERN FAYETTE COUNTIES WILL EXPIRE AT 300 AM CDT MONDAY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3847 8914 3850 8915 3852 8936 3850 8937
3850 8943 3847 8948 3847 8961 3843 8968
3848 8971 3865 8971 3866 8959 3884 8960
3908 8881 3891 8881 3891 8869 3847 8870
$$
GosselinThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 8:08 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 39 min |
| Jul 19, 8:34 PM CDT | Flash Flood Warning | LSX | Madison, Saint Clair | 6 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; radar from the NEXRAD Level II archive.