Alert archive / Illinois / Flash Flood Warnings in 2026

Flash Flood Warning 70, NWS Lincoln, IL

August 15, 2026Champaign County, Vermilion County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 15, 2026, 5:48 AM CDT for Champaign County, Vermilion County, Illinois. It was in force for 8 hr. 60 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: Aug 15, 2026, 5:48 AM CDT (10:48 UTC)
Expired: Aug 15, 2026, 1:40 PM CDT
In force: 8 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Champaign County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 114 km from the middle of the area, began a volume at 10:52 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
Aug 15, 5:53 AM CDT	RAIN 2.37	4 W Vermilion Regional, IL	Cocorahs station IL-VR-33 Danville 4.2 NW.
Aug 15, 6:00 AM CDT	RAIN 1.16	1 Nne Champaign, IL	Cocorahs station IL-CP-111 Champaign 0.6 NNE.
Aug 15, 6:00 AM CDT	RAIN 1.25	1 S Oakwood, IL	Cocorahs station IL-VR-49 Oakwood 0.5 SSE.
Aug 15, 6:00 AM CDT	RAIN 1.37	1 Ene Saint Joseph, IL	Cocorahs station IL-CP-137 St. Joseph 1.1 ENE.
Aug 15, 6:01 AM CDT	RAIN 1.97	1 Nne Danville, IL	Cocorahs station IL-VR-14 Danville.
Aug 15, 6:09 AM CDT	FLASH FLOOD	2 Nne Urbana, IL	4 of standing water in their yard reported by viewer relayed by broadcast media.
Aug 15, 6:14 AM CDT	RAIN 3.25	2 Se Collison, IL	Rainfall total with additional rain falling at time of ob.
Aug 15, 6:45 AM CDT	RAIN 2.73	1 Ssw Lake Of The Woods, IL	Cocorahs station IL-CP-139 Mahomet 1.6 E.
Aug 15, 6:48 AM CDT	RAIN 3.25	2 Se Collison, IL	Cocorahs station IL-VR-46 Collison 1.9 SE.
Aug 15, 7:00 AM CDT	FLASH FLOOD	1 S Thomasboro, IL	Report of a home in South Thomasboro beginning to take on water on the first floor from viewer relayed by broadcast media.
Aug 15, 7:00 AM CDT	RAIN 1.14	2 Se Urbana, IL	Cocorahs station IL-CP-135 Urbana 2.2 SE.
Aug 15, 7:00 AM CDT	RAIN 1.14	2 Sse Urbana, IL	Cocorahs station IL-CP-132 Urbana 2.4 SSE.
Aug 15, 7:00 AM CDT	RAIN 1.17	1 Nw Savoy, IL	Cocorahs station IL-CP-62 Champaign 2.5 S.
Aug 15, 7:00 AM CDT	RAIN 1.19	2 Ese Urbana, IL	Cocorahs station IL-CP-145 Urbana 1.6 ESE.
Aug 15, 7:00 AM CDT	RAIN 1.23	1 Sse Urbana, IL	Cocorahs station IL-CP-58 Urbana.
Aug 15, 7:00 AM CDT	RAIN 1.42	1 Sse Urbana, IL	Cocorahs station IL-CP-169 Urbana.
Aug 15, 7:00 AM CDT	RAIN 1.6	2 Ene Urbana, IL	Cocorahs station IL-CP-150 Urbana 1.9 ENE.
Aug 15, 7:00 AM CDT	RAIN 1.65	1 Nnw Fithian, IL	Cocorahs station IL-VR-42 Fithian 0.6 NNW.
Aug 15, 7:00 AM CDT	RAIN 1.89	1 W Urbana, IL	Cocorahs station IL-CP-151 Urbana 0.5 W.
Aug 15, 7:00 AM CDT	RAIN 1.99	3 Wnw Champaign, IL	Cocorahs station IL-CP-147 Champaign 2.6 WNW.
Aug 15, 7:00 AM CDT	RAIN 2.05	1 Se Muncie, IL	Cocorahs station IL-VR-45 Fithian 2.6 ESE.
Aug 15, 7:00 AM CDT	RAIN 2.14	1 Nne Danville, IL	Cocorahs station IL-VR-30 Danville 0.7 NNW.
Aug 15, 7:00 AM CDT	RAIN 2.26	3 Wsw Vermilion Regiona, IL	Cocorahs station IL-VR-38 Danville 3.1 NNW.
Aug 15, 7:00 AM CDT	RAIN 2.58	1 Nw Mahomet, IL	Cocorahs station IL-CP-138 Mahomet 1.0 NW.
Aug 15, 7:00 AM CDT	RAIN 2.71	3 W Bismarck, IL	Cocorahs station IL-VR-4 Henning 3.4 SE.
Aug 15, 7:00 AM CDT	RAIN 5.37	Fisher, IL	CO-OP Observer station FSHI2 Fisher.
Aug 15, 7:09 AM CDT	RAIN 1.43	Urbana, IL	Cocorahs station IL-CP-154 Urbana 0.3 SE.
Aug 15, 7:10 AM CDT	RAIN 3.62	3 Ne Fisher, IL	Cocorahs station IL-CP-153 Dewey 2.70 NW.
Aug 15, 7:15 AM CDT	RAIN 2.95	1 Wnw Lake Of The Woods, IL	Cocorahs station IL-CP-59 Mahomet 1.7 NNE.
Aug 15, 7:20 AM CDT	RAIN 1.38	1 N Savoy, IL	Cocorahs station IL-CP-165 Champaign 2.3 SSE.
Aug 15, 7:30 AM CDT	RAIN 1.91	3 Ene Urbana, IL	Cocorahs station IL-CP-126 Urbana 2.6 ENE.
Aug 15, 7:30 AM CDT	RAIN 2.23	Urbana, IL	Cocorahs station IL-CP-12 Urbana 0.1 SSE.
Aug 15, 7:30 AM CDT	RAIN 2.98	4 Ene Royal, IL	Cocorahs station IL-VR-53 , IL.
Aug 15, 7:31 AM CDT	RAIN 1.53	2 S Urbana, IL	Cocorahs station IL-CP-174 , IL.
Aug 15, 8:00 AM CDT	RAIN 1.63	1 S Urbana, IL	Cocorahs station IL-CP-175 Urbana 0.5 S.
Aug 15, 8:00 AM CDT	RAIN 2.25	5 Wnw Saint Joseph, IL	Cocorahs station IL-CP-177 4 WNW Saint Joseph.
Aug 15, 8:00 AM CDT	RAIN 2.65	Mahomet, IL	Cocorahs station IL-CP-163 Mahomet.
Aug 15, 8:00 AM CDT	RAIN 3.06	4 N Fisher, IL	Cocorahs station IL-CP-125 Foosland 5.0 ENE.
Aug 15, 8:00 AM CDT	RAIN 3.6	3 Ne Mansfield, IL	Cocorahs station IL-CP-140 Mansfield 3.2 NE.
Aug 15, 8:00 AM CDT	RAIN 3.87	1 Ne Rantoul, IL	Cocorahs station IL-CP-159 1 NE Rantoul.
Aug 15, 8:20 AM CDT	RAIN 2.02	Champaign, IL	Cocorahs station IL-CP-143 Champaign 0.3 NNE.
Aug 15, 8:20 AM CDT	RAIN 2.71	3 W Bismarck, IL	24 hour rainfall total of 2.71 inchs with 7.71 inches of rain past 4 days.
Aug 15, 8:30 AM CDT	RAIN 2.14	Champaign, IL	Cocorahs station IL-CP-89 Champaign 0.3 ESE.
Aug 15, 8:33 AM CDT	RAIN 1.55	1 N Savoy, IL	Cocorahs station IL-CP-148 Champaign 2.2 SSE.
Aug 15, 8:46 AM CDT	RAIN 2.61	1 Nnw Danville, IL	Cocorahs station IL-VR-48 Danville 1.1 WNW.
Aug 15, 8:55 AM CDT	FLASH FLOOD	1 Nw Muncie, IL	Two creeks out of their banks and over East 1800 North Rd. Relayed from media.
Aug 15, 9:00 AM CDT	RAIN 1.47	2 S Urbana, IL	Cocorahs station IL-CP-167 Urbana 1.8 S.
Aug 15, 9:00 AM CDT	RAIN 2.24	3 E Danville, IL	Cocorahs station IL-VR-44 Danville 2.5 E.
Aug 15, 9:03 AM CDT	FLASH FLOOD	2 Ne Oakwood, IL	West entrance to Kickapoo State Park closed due to water over roadway.
Aug 15, 9:08 AM CDT	FLASH FLOOD	4 Sse Gifford, IL	Bridge washed out on County Road 2500 East.
Aug 15, 9:30 AM CDT	RAIN 1.76	2 N Homer, IL	0.66 inches in past 2.5 hours.
Aug 15, 9:30 AM CDT	RAIN 4.35	4 Nne Lake Of The Woods, IL	Cocorahs station IL-CP-112 Mahomet 5.5 NE.
Aug 15, 9:37 AM CDT	FLASH FLOOD	1 Nw Muncie, IL	I-74 has water across the road between exits 200 and 206. Eastbound I-74 traffic is being diverted to US Rt 150 at exit 200 and westbound I-74 traffic is being diverted to US Rt 150 at exit 210.
Aug 15, 10:10 AM CDT	RAIN 7	Thomasboro, IL	12hr rainfall total. 7 inches of rain overnight.
Aug 15, 10:30 AM CDT	FLASH FLOOD	1 Se Hegeler, IL	Road closed due to water over the road.
Aug 15, 10:30 AM CDT	FLASH FLOOD	1 Sw Danville, IL	Ellsworth Park closed due to flooding.
Aug 15, 10:30 AM CDT	FLASH FLOOD	2 N Catlin, IL	Road closed due to water over the road.
Aug 15, 10:30 AM CDT	FLASH FLOOD	3 N Collison, IL	Road closed due to water over the road.
Aug 15, 10:30 AM CDT	FLASH FLOOD	Belgium, IL	Lyons Rd closed due to water over the road.
Aug 15, 10:30 AM CDT	FLASH FLOOD	Tilton, IL	Road closed due to severe flooding.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 12 storm reports to this flash flood warning; the first came 21 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 10.8 hours before the alert went out and 53 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: 1237 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

377 
WGUS53 KILX 151048
FFWILX
ILC019-183-151400-
/O.NEW.KILX.FF.W.0070.260815T1048Z-260815T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
548 AM CDT Sat Aug 15 2026

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Champaign County in east central Illinois...
  Central Vermilion County in east central Illinois...

* Until 900 AM CDT.

* At 547 AM CDT, the public reported thunderstorms producing heavy 
  rain across the warned area. Between 2 and 4 inches of rain have 
  fallen. The expected rainfall rate is 1 to 3 inches in 1 hour. 
  Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Broadcast Media reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Champaign, Urbana, Danville, Rantoul, Savoy, Mahomet, St. Joseph, 
  Tilton, Catlin, Fisher, Oakwood, Rossville, Thomasboro, Gifford, 
  Ogden, Potomac, Rankin, Fithian, Bondville and Lake Of The Woods.

This includes the following State Parks...
Kickapoo State Recreation Area and Middle Fork State Fish and 
Wildlife Area.

This includes the following highways...
	 Interstate 72 between  mile markers 174 and 182.
	 Interstate 74 between  mile markers 169 and 220.
	 Interstate 57 between  mile markers 232 and 257.

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.

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

&&

LAT...LON 4040 8846 4040 8793 4049 8794 4049 8785
      4032 8753 4007 8753 4007 8846

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR

$$

Copple

3 follow-up statements

560 
WGUS53 KILX 151301
FFWILX
ILC019-183-151600-
/O.EXT.KILX.FF.W.0070.000000T0000Z-260815T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
801 AM CDT Sat Aug 15 2026

The National Weather Service in Lincoln has extended the

* Flash Flood Warning for...
  Champaign County in east central Illinois...
  Central Vermilion County in east central Illinois...

* Until 1100 AM CDT.

* At 800 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 5 inches of rain have fallen. Flash flooding is already 
  occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Champaign, Urbana, Danville, Rantoul, Savoy, Mahomet, St. Joseph, 
  Tilton, Catlin, Fisher, Oakwood, Rossville, Thomasboro, Gifford, 
  Ogden, Potomac, Rankin, Fithian, Bondville and Lake Of The Woods.

This includes the following State Parks...
Kickapoo State Recreation Area and Middle Fork State Fish and 
Wildlife Area.

This includes the following highways...
	 Interstate 72 between  mile markers 174 and 182.
	 Interstate 74 between  mile markers 169 and 220.
	 Interstate 57 between  mile markers 232 and 257.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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

&&

LAT...LON 4040 8846 4040 8793 4049 8794 4049 8785
      4032 8753 4007 8753 4007 8846

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

MJA

978 
WGUS53 KILX 151546
FFWILX
ILC019-183-151900-
/O.EXT.KILX.FF.W.0070.000000T0000Z-260815T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
1046 AM CDT Sat Aug 15 2026

The National Weather Service in Lincoln has extended the

* Flash Flood Warning for...
  Champaign County in east central Illinois...
  Central Vermilion County in east central Illinois...

* Until 200 PM CDT.

* At 1046 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 5 inches of rain have fallen. Flash flooding is already 
  occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Champaign, Urbana, Danville, Rantoul, Savoy, Mahomet, St. Joseph, 
  Tilton, Catlin, Fisher, Oakwood, Rossville, Thomasboro, Gifford, 
  Ogden, Potomac, Rankin, Fithian, Bondville and Lake Of The Woods.

This includes the following State Parks...
Kickapoo State Recreation Area and Middle Fork State Fish and 
Wildlife Area.

This includes the following highways...
	 Interstate 72 between  mile markers 174 and 182.
	 Interstate 74 between  mile markers 169 and 220.
	 Interstate 57 between  mile markers 232 and 257.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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

&&

LAT...LON 4040 8846 4040 8793 4049 8794 4049 8785
      4032 8753 4007 8753 4007 8846

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

MJA

713 
WGUS73 KILX 151840
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
140 PM CDT Sat Aug 15 2026

ILC019-183-151850-
/O.CAN.KILX.FF.W.0070.000000T0000Z-260815T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Champaign IL-Vermilion IL-
140 PM CDT Sat Aug 15 2026

...FLASH FLOOD WARNING FOR CHAMPAIGN AND CENTRAL VERMILION COUNTIES 
HAS BEEN REPLACED WITH A FLOOD WARNING...

&&

LAT...LON 4040 8846 4040 8793 4049 8794 4049 8785
      4032 8753 4007 8753 4007 8846

$$

NMA

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this flash flood warning went out at Aug 15, 2:20 AM CDT, 3 hours 28 minutes earlier. Its key messages:

There is flash flooding ongoing across portions of central Illinois this morning, where thunderstorms track over areas that have already seen 4-6 inches of rain since Thursday. Areas north of a Havana to Bloomington line are most at risk.
Storms have the potential to produce damaging winds today and tomorrow. SPC has a marginal (level 1 of 5) risk of severe weather for the weekend.
The heat and humidity remain a concern for the weekend, with the hottest conditions in the southern half of the state.

Area forecast discussion, Aug 15, 2:20 AM CDT, 3 hours 28 minutes before

Area Forecast Discussion
National Weather Service Lincoln IL
220 AM CDT Sat Aug 15 2026

.KEY MESSAGES...

- There is flash flooding ongoing across portions of central
  Illinois this morning, where thunderstorms track over areas
  that have already seen 4-6 inches of rain since Thursday.
  Areas north of a Havana to Bloomington line are most at risk.

- Storms have the potential to produce damaging winds today and
  tomorrow. SPC has a marginal (level 1 of 5) risk of severe
  weather for the weekend.

- The heat and humidity remain a concern for the weekend, with
  the hottest conditions in the southern half of the state.

&&

.DISCUSSION...
Issued at 220 AM CDT Sat Aug 15 2026

Tonight, storms are moving across central IL. There is a low risk
(but non-zero) for damaging winds within these storms, but the main
concern is the flash flooding risk. WPC has areas near and north of
I-72 in a moderate risk (level 3 of 4) for excessive rainfall for
the overnight hours. The 00z sounding shows the environment having
PWATs of 2.2-2.4 inches. Over the last few days, this area has
gotten 3-6 inches of rain, with some locally higher amounts. The
storms passing through tonight are expected to drop another 2-5
inches with the LPMM suggesting some localized pockets of up to 10
inches. Flash flood guidance seems a bit generous (too high). If the
pockets of higher rain set up over where the ground is already
extremely saturated, flash flooding is likely.

For the remainder of the day after this morning round of convection
exits about 15-16z, there is a marginal risk for severe weather for
additional activity that will move through. It will be very similar
to what has happened over the last few days. The next round of MCS
activity will move into central IL by late evening and will continue
into the overnight hours. The main concern will be damaging winds
and the heavy rain potential.

There is another marginal risk for severe weather again tomorrow for
areas south of a Schuyler to McLean County line with a similar
environment in place as previous days. The forecast will continue to
evolve as we get newer runs of the models.

Temperatures remain hot and humid. The heat advisory for south of I-
70 is valid through Sunday. Heat indices of 100-110 degrees are
forecast through Sunday, but how far north these heat indices get
will depend solely on the convection location. Like yesterday for
example, the convection lingered further south longer than forecast,
so heat indices struggled to hit triple digits.

Next week may bring us a brief break in the active weather and the
heat briefly. A high pressure area will set up over the Upper
Mississippi Valley / Great Lakes region by Monday, behind a cold
front that will move through central IL during the day. Temperatures
starting Monday into much of the next week will be mainly in the
upper 70s to 80s for highs and 60s to low 70s for lows.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1223 AM CDT Sat Aug 15 2026

Thunderstorms are moving across portions of central Illinois during
the early overnight hours and expected to continue into Saturday
morning before exiting east of the area. MVFR/IFR ceilings currently
in place north of the terminals will sink south to along the I-74
corridor overnight, but confidence is currently low that it will
reach as far south as SPI/DEC. Areas that do drop are expected to
improve back to VFR early to mid Saturday afternoon as winds veer to
SWerly.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 10 AM CDT this morning for ILZ027>031-
036>038-040-041-043>046-055-057.
Heat Advisory until 8 PM CDT Sunday for ILZ066>068-071>073.

&&

KEY MESSAGES...Copple
DISCUSSION...Copple
AVIATION...Deubelbeiss

Hazardous weather outlook, Aug 14, 3:00 PM CDT, 14 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Lincoln IL
300 PM CDT Fri Aug 14 2026

ILZ027>031-036>038-040>057-061>063-066>068-071>073-151100-
Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler-
Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott-
Morgan-Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby-
Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence-
300 PM CDT Fri Aug 14 2026

This Hazardous Weather Outlook is for central Illinois, east
central Illinois, southeast Illinois and west central Illinois.

.DAY ONE...Tonight.

Widespread thunderstorm activity is likely tonight, mainly north of
I-72. Locally strong to severe storms and flash flooding are
possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Hot and humid conditions will peak over the area this weekend. Peak
afternoon heat indices will range from 103 to 112 Saturday, and 100
to 105 Sunday.

Daily chances for thunderstorms exist through the weekend, mainly
north of I-70 for Saturday. Some of these storms could be severe and
produce heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed after midnight.

37

In the hours before

Special weather statement, Aug 15, 4:29 AM CDT, 1 hour 19 minutes before

Special Weather Statement
National Weather Service Lincoln IL
429 AM CDT Sat Aug 15 2026

ILZ038-041>043-047-048-050-051-151000-
Logan-Sangamon-Mason-Morgan-Menard-De Witt-McLean-Cass-
429 AM CDT Sat Aug 15 2026

...STRONG THUNDERSTORMS WILL IMPACT MENARD...LOGAN...NORTHWESTERN
SANGAMON...NORTHWESTERN DE WITT...SOUTHEASTERN CASS...SOUTHWESTERN
MCLEAN...SOUTHEASTERN MASON AND NORTHEASTERN MORGAN COUNTIES THROUGH
500 AM CDT...

At 429 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near San Jose to near Alexander. Movement was
east at 50 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Springfield, Lincoln, Mason City, Petersburg, Athens, Chatham,
Alexander, Sherman, Rochester, Riverton, Atlanta, Williamsville, New
Berlin, Ashland, McLean, Pleasant Plains, Greenview, San Jose,
Dawson, and Tallula.

This includes the following highways...
 Interstate 155 between mile markers 0 and 10.
 Interstate 55 between mile markers 87 and 145.
 Interstate 72 between mile markers 73 and 111.

This also includes Edward R. Madigan State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4033 8911 3965 8959 3973 9013 4031 8965
TIME...MOT...LOC 0929Z 271DEG 44KT 4027 8965 3976 9003

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

Copple

Local storm report, Aug 15, 4:51 AM CDT, 57 minutes before

Preliminary Local Storm Report
National Weather Service Lincoln IL
451 AM CDT Sat Aug 15 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0446 AM     Rain             1 S Danville            40.13N 87.63W
08/15/2026  M1.50 Inch       Vermilion          IL   Emergency Mngr

            1.50 inches of rainfall measured in last
            30-40 minutes in Danville.

&&

RAC

Local storm report, Aug 15, 5:21 AM CDT, 27 minutes before

Preliminary Local Storm Report
National Weather Service Lincoln IL
521 AM CDT Sat Aug 15 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0519 AM     Flash Flood      Fisher                  40.32N 88.35W
08/15/2026                   Champaign          IL   Broadcast Media

            Street flooding with standing water on
            Sangamon St and 1st Street in Fisher.

&&

RAC

Local storm report, Aug 15, 5:25 AM CDT, 23 minutes before

Preliminary Local Storm Report
National Weather Service Lincoln IL
525 AM CDT Sat Aug 15 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0522 AM     Rain             Fisher                  40.32N 88.35W
08/15/2026  M6.50 Inch       Champaign          IL   Trained Spotter

            Total rainfall since approximately 10pm with
            rain continuing at time of report.

&&

RAC

Local storm report, Aug 15, 5:31 AM CDT, 17 minutes before

Preliminary Local Storm Report
National Weather Service Lincoln IL
531 AM CDT Sat Aug 15 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0506 AM     Rain             Brocton                 39.72N 87.93W
08/15/2026  M4.10 Inch       Edgar              IL   Trained Spotter

            Total rainfall from overnight storms, rain
            continuing at time of report.

&&

RAC

Local storm report, Aug 15, 5:38 AM CDT, 10 minutes before

Preliminary Local Storm Report
National Weather Service Lincoln IL
538 AM CDT Sat Aug 15 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0536 AM     Flash Flood      Rantoul                 40.31N 88.16W
08/15/2026                   Champaign          IL   Broadcast Media

            Route 136 viaduct in Rantoul is full of
            water and the road is closed.

&&

RAC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 11:56 PM CDT	Flash Flood Warning	ILX	Fulton, Knox, Mason, Peoria, Tazewell, Woodford	7 hr
Aug 15, 1:09 AM CDT	Flash Flood Warning	ILX	McLean	6 hr
Aug 15, 1:23 AM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason	67 min
Aug 15, 1:51 AM CDT	Severe Thunderstorm Warning	ILX	Fulton	24 min
Aug 15, 2:19 AM CDT	Flash Flood Warning	ILX	McLean	5 hr
Aug 15, 2:23 AM CDT	Severe Thunderstorm Warning	ILX	Peoria, Tazewell	38 min
Aug 15, 2:36 AM CDT	Flash Flood Warning Considerable damage threat	ILX	McLean	6 hr
Aug 15, 3:23 AM CDT	Flash Flood Warning	ILX	Champaign	5 hr
Aug 15, 3:43 AM CDT	Severe Thunderstorm Warning	ILX	Cass, Fulton, Mason, Menard, Morgan, Schuyler and 1 more	62 min
Aug 15, 3:54 AM CDT	Flash Flood Warning	ILX	Vermilion	4 hr
Aug 15, 4:29 AM CDT	Special Weather Statement	ILX	Logan, Menard, Sangamon	31 min
Aug 15, 5:33 AM CDT	Areal Flood Advisory	ILX	Morgan	3 hr
Aug 15, 6:24 AM CDT	Special Weather Statement	ILX	Champaign, Piatt, Vermilion	36 min
Aug 15, 6:37 AM CDT	Areal Flood Warning	ILX	Fulton, Knox, Mason, Peoria, Tazewell, Woodford	27 hr
Aug 15, 7:33 AM CDT	Areal Flood Warning	ILX	McLean	65 min
Aug 15, 7:40 AM CDT	Areal Flood Warning	ILX	McLean	26 hr
Aug 15, 8:04 AM CDT	Flash Flood Warning	ILX	McLean	5 hr
Aug 15, 8:38 AM CDT	Flash Flood Warning Considerable damage threat	ILX	McLean	4 hr
Aug 15, 10:11 AM CDT	River Flood Warning	ILX	Cass, Fulton, Mason	13 days
Aug 15, 10:12 AM CDT	River Flood Warning	ILX	Brown, Cass, Morgan, Schuyler	14 days
Aug 15, 10:19 AM CDT	River Flood Warning	ILX	Piatt	7 days
Aug 15, 12:40 PM CDT	Areal Flood Warning	ILX	McLean	21 hr
Aug 15, 1:40 PM CDT	Areal Flood Warning	ILX	Champaign, Vermilion	46 hr
Aug 15, 1:46 PM CDT	River Flood Warning	ILX	McLean, Tazewell, Woodford	20 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.