Alert archive / Illinois / Flash Flood Warnings in 2024

Flash Flood Warning 49, NWS St. Louis, MO

July 29, 2024Fayette County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 29, 2024, 9:17 PM CDT for Fayette County, Illinois. It was in force for 3 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 29, 2024, 9:17 PM CDT (02:17 UTC)
Expired: Jul 30, 2024, 12:15 AM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Fayette County, IL

The radar

The St Louis radar (KLSX), 132 km from the middle of the area, began a volume at 02:18 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 29, 9:45 PM CDT	FLASH FLOOD	1 Ssw Vandalia, IL	Several roads in town were flooded from the heavy rains including Kennedy Blvd.

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, 2.3 hours before the alert went out and 142 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2206 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 831 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

As transmitted.

430 
WGUS53 KLSX 300217
FFWLSX
ILC051-300515-
/O.NEW.KLSX.FF.W.0049.240730T0217Z-240730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
917 PM CDT Mon Jul 29 2024

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Southwestern Fayette County in south central Illinois...

* Until 1215 AM CDT.

* At 917 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. 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 indicated.

  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, Mulberry Grove, Shobonier, Pittsburg, Shafter, 
  Hagerstown and St. Paul.

This includes Interstate 70 in Illinois between exits 61 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 3899 8926 3900 8926 3900 8925 3906 8925
      3905 8908 3882 8891 3882 8918 3889 8926

FLASH FLOOD...RADAR INDICATED

$$

Britt

2 follow-up statements

146 
WGUS73 KLSX 300420
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1120 PM CDT Mon Jul 29 2024

ILC051-300515-
/O.CON.KLSX.FF.W.0049.000000T0000Z-240730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette IL-
1120 PM CDT Mon Jul 29 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT TUESDAY 
FOR SOUTHWESTERN FAYETTE COUNTY...

At 1120 PM CDT, Doppler radar indicated thunderstorms producing 
heavy rain have moved out of the warned area, though some light rain 
is still possible. Up to 3 inches of rain have fallen. Flash 
flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

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, Mulberry Grove, Shobonier, Pittsburg, Shafter, 
  Hagerstown and St. Paul.

This includes Interstate 70 in Illinois between exits 61 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 3899 8926 3900 8926 3900 8925 3906 8925
      3905 8908 3882 8891 3882 8918 3889 8926

FLASH FLOOD...RADAR INDICATED

$$

Byrd

559 
WGUS73 KLSX 300511
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1211 AM CDT Tue Jul 30 2024

ILC051-300521-
/O.EXP.KLSX.FF.W.0049.000000T0000Z-240730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette IL-
1211 AM CDT Tue Jul 30 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 1215 AM CDT EARLY THIS MORNING 
FOR SOUTHWESTERN FAYETTE COUNTY...

The heavy rain has ended. Flood waters have receded. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

&&

LAT...LON 3899 8926 3900 8926 3900 8925 3906 8925
      3905 8908 3882 8891 3882 8918 3889 8926

$$

Byrd

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 7:41 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	49 min
Jul 29, 8:09 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette	51 min
Jul 29, 8:11 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Macoupin, Madison	49 min
Jul 29, 8:27 PM CDT	Severe Thunderstorm Warning	LSX	Bond	32 min
Jul 29, 8:44 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	61 min
Jul 29, 8:50 PM CDT	Tornado Warning	LSX	Bond, Madison	27 min
Jul 29, 8:52 PM CDT	Tornado Warning	LSX	Fayette, Marion	38 min
Jul 29, 9:16 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison	59 min
Jul 29, 10:00 PM CDT	Areal Flood Advisory	LSX	Bond, Clinton, Madison	57 min
Jul 29, 10:33 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	42 min
Jul 29, 10:57 PM CDT	Flash Flood Warning	LSX	Bond, Clinton, Madison	4 hr
Jul 29, 11:38 PM CDT	Areal Flood Advisory	LSX	Madison	4 hr
Jul 29, 11:50 PM CDT	Areal Flood Advisory	LSX	Clinton, Saint Clair, Washington	4 hr
Jul 30, 6:20 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	40 min
Jul 30, 6:42 AM CDT	River Flood Warning	LSX	Clinton	7 hr
Jul 30, 4:20 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	55 min
Jul 30, 4:24 PM CDT	Areal Flood Advisory	LSX	Fayette, Montgomery	3 hr
Jul 30, 5:01 PM CDT	Severe Thunderstorm Warning	LSX	Marion	16 min

Nearby

Flash Flood Warnings in Illinois, 2024 Every flash flood warning in 2024

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.