Alert archive / Illinois / Flash Flood Warnings in 2026

Flash Flood Warning 49, NWS Lincoln, IL

July 27, 2026Effingham County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jul 27, 2026, 2:24 AM CDT for Effingham County, Illinois. It was in force for 4 hr. 6 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: Jul 27, 2026, 2:24 AM CDT (07:24 UTC)
Expired: Jul 27, 2026, 6:30 AM CDT
In force: 4 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

County Effingham County, IL

The radar

The Evansville,IN radar (KVWX), 116 km from the middle of the area, began a volume at 07:27 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 27, 5:00 AM CDT	RAIN 4.25	Teutopolis, IL	Storm total.
Jul 27, 5:35 AM CDT	RAIN 1.82	Effingham County Airpor, IL	AWOS station K1H2 Effingham Arpt.
Jul 27, 5:45 AM CDT	RAIN 3.02	2 Nne Effingham, IL	Mesonet station DW5254 Baraboo.
Jul 27, 5:45 AM CDT	RAIN 3.43	Teutopolis, IL	Mesonet station FW1289 Teutopolis.
Jul 27, 5:50 AM CDT	FLOOD	Teutopolis, IL	A foot of standing water in the Caseys parking lot. Photo shows water up to the bumper of a white commercial van.
Jul 27, 5:52 AM CDT	FLOOD	1 Ene Teutopolis, IL	Route 40 flooded with standing water.

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, 7.4 hours before the alert went out and 115 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: 5988 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 6.4
Supercell composite: 28.4

Open this sounding in Storm Lab

The text

As transmitted.

093 
WGUS53 KILX 270724
FFWILX
ILC049-271000-
/O.NEW.KILX.FF.W.0049.260727T0724Z-260727T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
224 AM CDT Mon Jul 27 2026

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Eastern Effingham County in south central Illinois...

* Until 500 AM CDT.

* At 222 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen, with the heaviest amounts over Effingham. The 
  expected rainfall rate is 1 to 2 inches in 1 hour. 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...
  Effingham, Teutopolis, Watson, Dieterich, Heartville and Effingham 
  County Airport.

This includes the following highways...
	 Interstate 70 between  mile markers 89 and 101.
	 Interstate 57 between  mile markers 150 and 167.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3917 8847 3917 8845 3910 8836 3891 8836
      3892 8859 3921 8865 3922 8850 3919 8847

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Geelhart

4 follow-up statements

766 
WGUS73 KILX 270906
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
406 AM CDT Mon Jul 27 2026

ILC049-271000-
/O.CON.KILX.FF.W.0049.000000T0000Z-260727T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Effingham IL-
406 AM CDT Mon Jul 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CDT EARLY THIS 
MORNING FOR EASTERN EFFINGHAM COUNTY...

At 402 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 3.5 and 5 inches of rain have 
fallen from north of Effingham to east of Heartville. Personal 
weather stations have measured 3.8 inches southeast of downtown 
Effingham, and 3.7 inches near the I-57 and highway 45 exit on the 
north side of town.  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...
  Effingham, Teutopolis, Watson, Dieterich, Heartville and Effingham 
  County Airport.

This includes the following highways...
	 Interstate 70 between  mile markers 89 and 101.
	 Interstate 57 between  mile markers 150 and 167.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3917 8847 3917 8845 3910 8836 3891 8836
      3892 8859 3921 8865 3922 8850 3919 8847

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Geelhart

754 
WGUS53 KILX 270951
FFWILX
ILC049-271130-
/O.EXT.KILX.FF.W.0049.000000T0000Z-260727T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
451 AM CDT Mon Jul 27 2026

The National Weather Service in Lincoln has extended the

* Flash Flood Warning for...
  Eastern Effingham County in south central Illinois...

* Until 630 AM CDT.

* At 450 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain continue across the warned area, although they are now 
  occurring closer to the county line. Between 4 and 6 inches of 
  rain have fallen. Additional rainfall amounts up to 1 inch are 
  possible in areas from near Teutopolis to Dieterich.

  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...
  Effingham, Teutopolis, Watson, Dieterich, Heartville and Effingham 
  County Airport.

This includes the following highways...
	 Interstate 70 between  mile markers 89 and 101.
	 Interstate 57 between  mile markers 150 and 167.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3917 8847 3917 8845 3910 8836 3891 8836
      3892 8859 3921 8865 3922 8850 3919 8847

FLASH FLOOD...RADAR INDICATED

$$

Geelhart

730 
WGUS73 KILX 271051
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
551 AM CDT Mon Jul 27 2026

ILC049-271130-
/O.CON.KILX.FF.W.0049.000000T0000Z-260727T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Effingham IL-
551 AM CDT Mon Jul 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 AM CDT THIS 
MORNING FOR EASTERN EFFINGHAM COUNTY...

At 549 AM CDT, Doppler radar continued to show thunderstorms, though 
they are becoming more confined to areas near the Jasper County 
border. Between 4 and 7 inches of rain have fallen since midnight. 
Additional rainfall amounts up to 1 inch are possible in the warned 
area.

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...
  Effingham, Teutopolis, Dieterich, Heartville and Effingham County 
  Airport.

This includes the following highways...
	 Interstate 70 between  mile markers 93 and 101.
	 Interstate 57 between  mile markers 159 and 167.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3891 8836 3892 8851 3921 8860 3922 8850
      3919 8847 3917 8847 3917 8845 3910 8836

FLASH FLOOD...RADAR INDICATED

$$

Geelhart

737 
WGUS73 KILX 271127
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
627 AM CDT Mon Jul 27 2026

ILC049-271137-
/O.EXP.KILX.FF.W.0049.000000T0000Z-260727T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Effingham IL-
627 AM CDT Mon Jul 27 2026

...FLASH FLOOD WARNING AT 630 AM CDT THIS MORNING FOR EASTERN 
EFFINGHAM COUNTY HAS BEEN REPLACED WITH A FLOOD WARNING...

&&

LAT...LON 3891 8836 3892 8851 3921 8860 3922 8850
      3919 8847 3917 8847 3917 8845 3910 8836

$$

Geelhart

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 26, 9:30 PM CDT	Special Weather Statement	ILX	Lawrence	15 min
Jul 26, 9:46 PM CDT	Severe Thunderstorm Warning	ILX	Lawrence	15 min
Jul 26, 10:00 PM CDT	Special Weather Statement	ILX	Lawrence	15 min
Jul 26, 10:15 PM CDT	Special Weather Statement	ILX	Lawrence	15 min
Jul 27, 2:02 AM CDT	Heat Advisory	ILX	Clark, Edgar, Vermilion	9 hr
Jul 27, 2:31 AM CDT	Areal Flood Advisory	ILX	Clay	3 hr
Jul 27, 2:50 AM CDT	Flash Flood Warning	ILX	Clay	5 hr
Jul 27, 4:12 AM CDT	Severe Thunderstorm Warning	ILX	Clay	33 min
Jul 27, 5:01 AM CDT	Severe Thunderstorm Warning	ILX	Clay, Effingham, Jasper	44 min
Jul 27, 6:27 AM CDT	Areal Flood Warning	ILX	Effingham	3 hr
Jul 27, 7:11 AM CDT	Severe Thunderstorm Warning	ILX	Cumberland	14 min
Jul 27, 3:58 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Menard, Sangamon	29 min
Jul 27, 4:26 PM CDT	Special Weather Statement	ILX	Christian	34 min
Jul 27, 5:17 PM CDT	Severe Thunderstorm Warning	ILX	Edgar, Vermilion	43 min
Jul 27, 5:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ILX	Vermilion	60 min
Jul 27, 6:07 PM CDT	Tornado Warning	ILX	Vermilion	38 min
Jul 27, 6:13 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Edgar	62 min
Jul 27, 6:42 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Crawford	48 min
Jul 27, 6:44 PM CDT	Severe Thunderstorm Warning	ILX	Vermilion	31 min
Jul 27, 6:59 PM CDT	Flash Flood Warning	ILX	Clark, Edgar	3 hr

Nearby

Flash Flood Warnings in Illinois, 2026 Every flash flood warning in 2026

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.