Flash Flood Warning 65, NWS Lincoln, IL

342 
WGUS73 KILX 150651
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
151 AM CDT Sat Aug 15 2026

ILC113-150915-
/O.CON.KILX.FF.W.0065.000000T0000Z-260815T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
McLean IL-
151 AM CDT Sat Aug 15 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM CDT EARLY THIS 
MORNING FOR SOUTHWESTERN MCLEAN COUNTY...

At 150 AM CDT, the public reported thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 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...Flash flooding caused by thunderstorms.

SOURCE...Public reported several flooded roads and viaducts
         underwater in Bloomington.

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...
  Bloomington, Normal, Le Roy, Heyworth, Danvers, Downs, McLean, 
  Stanford, Ellsworth, Central Illinois Regional Airport, Shirley, 
  Holder and Moraine View State Park.

This includes the following State Parks...
	Moraine View State Park.

This includes the following highways...
	 Interstate 39 between  mile markers 0 and 1.
	 Interstate 74 between  mile markers 123 and 155.
	 Interstate 55 between  mile markers 142 and 167.

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 4028 8926 4047 8927 4051 8927 4053 8927
      4055 8927 4057 8927 4051 8864 4028 8865

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

$$

Copple

645 
WGUS53 KILX 150834
FFWILX
ILC113-151300-
/O.EXT.KILX.FF.W.0065.000000T0000Z-260815T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Lincoln has extended the

* Flash Flood Warning for...
  Southwestern McLean County in central Illinois...

* Until 800 AM CDT.

* At 334 AM CDT, the public reported thunderstorms producing heavy 
  rain across the warned area. Between 2 and 5 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...Flash flooding caused by thunderstorms.

  SOURCE...Public reported.

  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...
  Bloomington, Normal, Le Roy, Heyworth, Danvers, Downs, McLean, 
  Stanford, Ellsworth, Central Illinois Regional Airport, Shirley, 
  Holder and Moraine View State Park.

This includes the following State Parks...
	Moraine View State Park.

This includes the following highways...
	 Interstate 39 between  mile markers 0 and 1.
	 Interstate 74 between  mile markers 123 and 155.
	 Interstate 55 between  mile markers 142 and 167.

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 4028 8926 4047 8927 4051 8927 4053 8927
      4055 8927 4057 8927 4051 8864 4028 8865

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

$$

Copple

784 
WGUS73 KILX 151233
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
733 AM CDT Sat Aug 15 2026

ILC113-151243-
/O.CAN.KILX.FF.W.0065.000000T0000Z-260815T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
McLean IL-
733 AM CDT Sat Aug 15 2026

...FLASH FLOOD WARNING FOR SOUTHWESTERN MCLEAN COUNTY HAS BEEN 
REPLACED WITH A FLOOD WARNING...

&&

LAT...LON 4028 8926 4047 8927 4051 8927 4053 8927
      4055 8927 4057 8927 4051 8864 4028 8865

$$

MJA

Area Forecast Discussion
National Weather Service Lincoln IL
1223 AM CDT Sat Aug 15 2026

.KEY MESSAGES...

- There is a significant threat of flash flooding across
  portions of central Illinois overnight into early Saturday
  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.

- Some of these storms also have the potential to produce
  damaging winds, mainly after midnight.

- The heat and humidity remain a concern for the weekend, with
  the highest chances of seeing more than a 105 degree heat
  index (40-60%) in areas from Beardstown southeast to Marshall.

&&

.DISCUSSION...
Issued at 231 PM CDT Fri Aug 14 2026

The busy weather trend continues, and focus efforts has
primarily been with the first 24-36 hours of the forecast.

Flooding Concerns:

The earlier rainfall has finally moved out, and the Flood Watch
for east central Illinois was cancelled.

Rainfall amounts of 4 to 6 inches were fairly widespread from
the I-74 corridor and then southward in east central Illinois to
I-70. While the earlier watch from Havana-Bloomington northward
was allowed to expire at 10 am, a new watch has been issued for
this area beginning at 10 pm tonight. The next MCS is expected
to develop across Iowa this evening, as an upper wave moves
across that area, and then move into Illinois shortly after
midnight. HREF precipitable water values over 2.2 inches remain
in place overnight across the northern third of Illinois, and
probabilities of over 2 inches of rain tonight are highest from
Galesburg to Lacon (40-60%). However, its LPMM guidance suggests
3-5 inches are a valid concern, depending on where exactly the
MCS tracks. While the flooding is the main focus with this MCS,
there remains a level 2 severe weather threat with it, primarily
for scattered damaging winds.

Heat Concerns:

Extensive rain today has significantly kept temperatures lower
than earlier projections. While skies are now becoming partly
sunny south of I-72, it is unclear whether enough sunshine will
get heat index readings up to 100 degrees in any of the advisory
area today. The current advisory area is expected to have less
impact from the overnight MCS, and guidance continues to point
toward heat index values 105-110 degrees on Saturday and Sunday.
No changes in the Heat Advisory were made in that area for this
reason. Further north, NBM guidance is also showing similar
heat index for Saturday for all of central Illinois. However,
the lingering effects of the next MCS suggest the guidance is
overdoing projections. HREF probabilities of greater than 105
degree heat index on Saturday are highest from Beardstown
southeast through Taylorville to Marshall (40-60%), and tail off
pretty quickly north of there. Will leave any headline changes
for the overnight forecast cycle, once the MCS shows its hand.

&&

.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 ILZ049>052-061>063-
066>068-071>073.

&&

KEY MESSAGES...Geelhart
DISCUSSION...Geelhart
AVIATION...Deubelbeiss

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