Alert archive / Illinois / Flash Flood Warnings in 2023
Flash Flood Warning 4, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at May 7, 2023, 10:13 PM CDT for Montgomery County, Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 7, 2023, 10:13 PM CDT (03:13 UTC)
- Expired
- May 8, 2023, 4:15 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Montgomery County, IL
The radar
The Lincoln radar (KILX), 84 km from the middle of the area, began a volume at 03:12 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.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.2 hours before the alert went out and 119 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
- 2003 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 822 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -67 m²/s²
- 0-3 km storm-relative helicity
- -65 m²/s²
- Significant tornado parameter
- -0.6
- Supercell composite
- -3.3
The text
As transmitted.
833
WGUS53 KLSX 080313
FFWLSX
ILC135-080915-
/O.NEW.KLSX.FF.W.0004.230508T0313Z-230508T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1013 PM CDT Sun May 7 2023
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northwestern Montgomery County in south central Illinois...
* Until 415 AM CDT Monday.
* At 1013 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 4 inches of rain
have fallen since late Sunday afternoon. 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...
White Oak, Farmersville, Waggoner and Harvel.
This includes the following streams and drainages...
Shop Creek, Macoupin Creek, West Branch Horse Creek, Horse Creek,
West Fork Shoal Creek and Deer Branch.
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 8953 3934 8970 3935 8970 3937 8970
3938 8970 3942 8970 3949 8970 3951 8970
3952 8970 3952 8964 3952 8953 3947 8953
3944 8953 3942 8953
FLASH FLOOD...RADAR INDICATED
$$
Carney2 follow-up statements
848
WGUS73 KLSX 080546
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
1246 AM CDT Mon May 8 2023
ILC135-080915-
/O.CON.KLSX.FF.W.0004.000000T0000Z-230508T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery IL-
1246 AM CDT Mon May 8 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM CDT EARLY THIS
MORNING FOR NORTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL
ILLINOIS...
At 1246 AM CDT, Doppler radar indicate showers and a few
thunderstorms continue to move across the area where earlier
thunderstorms produced between 3 and 5 inches of rain. Additional
rainfall amounts up to 1 inch are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
White Oak, Farmersville, Waggoner and Harvel.
This includes the following streams and drainages...
Horse Creek, Macoupin Creek, Shop Creek, Deer Branch, West Fork
Shoal Creek and West Branch Horse Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3935 8953 3934 8970 3935 8970 3937 8970
3938 8970 3942 8970 3949 8970 3951 8970
3952 8970 3952 8964 3952 8953 3947 8953
3944 8953 3942 8953
FLASH FLOOD...RADAR INDICATED
$$
Britt910
WGUS73 KLSX 080911
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
411 AM CDT Mon May 8 2023
ILC135-080921-
/O.EXP.KLSX.FF.W.0004.000000T0000Z-230508T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery IL-
411 AM CDT Mon May 8 2023
...FLASH FLOOD WARNING WILL EXPIRE AT 415 AM CDT EARLY THIS MORNING
FOR NORTHWESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3935 8953 3934 8970 3935 8970 3937 8970
3938 8970 3942 8970 3949 8970 3951 8970
3952 8970 3952 8964 3952 8953 3947 8953
3944 8953 3942 8953
$$
FuchsThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 7:19 PM CDT | Areal Flood Advisory | LSX | Bond, Fayette, Montgomery | 3 hr |
| May 7, 7:21 PM CDT | Severe Thunderstorm Warning | LSX | Brown | 9 min |
| May 8, 12:15 AM CDT | Areal Flood Advisory | LSX | Fayette, Montgomery | 6 hr |
| May 8, 11:00 AM CDT | River Flood Warning | LSX | Calhoun, Greene, Jersey | 21 days |
Nearby
Flash Flood Warnings in Illinois, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.