Alert archive / Illinois / Flash Flood Warnings in 2021
Flash Flood Warning 41, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 31, 2021, 11:37 PM CDT for Bond County, Fayette County, Montgomery County, 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
- Aug 31, 2021, 11:37 PM CDT (04:37 UTC)
- Expired
- Sep 1, 2021, 5:30 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bond County, IL, Fayette County, IL, Montgomery County, IL
The radar
The Lincoln radar (KILX), 108 km from the middle of the area, began a volume at 04:41 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 |
|---|---|---|---|
| Sep 1, 3:00 AM CDT | FLASH FLOOD | Irving, IL | FLOODING ON ROUTE 16 IN THE TOWNS OF IRVING AND WITT AND ALSO ON COFFEEN ROAD AND FILLMORE TRAIL. |
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, 4.6 hours before the alert went out and 123 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
- 59 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1442 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
556
WGUS53 KLSX 010437
FFWLSX
ILC005-051-135-011030-
/O.NEW.KLSX.FF.W.0041.210901T0437Z-210901T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1137 PM CDT Tue Aug 31 2021
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northern Bond County in south central Illinois...
Northwestern Fayette County in south central Illinois...
Montgomery County in south central Illinois...
* Until 530 AM CDT.
* At 1137 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. 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...
Vandalia, Greenville, Hillsboro, Nokomis, Ramsey, Witt, Taylor
Springs, Coffeen, Mulberry Grove, Schram City, Sorento, Van
Burensburg, Woburn, Reno, Irving, Shafter, Panama, Fillmore,
Coalton and Donnellson.
This includes the following State Parks...
Ramsey Lake State Park.
This includes the following highways...
Interstate 70 in Illinois between exits 52 and 63.
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.
&&
LAT...LON 3935 8955 3935 8915 3922 8914 3921 8902
3889 8902 3890 8961
FLASH FLOOD...RADAR INDICATED
$$
GKSNearby
Flash 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.