Flash Flood Warning 64, NWS Lincoln, IL

504 
WGUS73 KILX 150653
FFSILX

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

ILC057-095-125-143-179-203-151100-
/O.CON.KILX.FF.W.0064.000000T0000Z-260815T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fulton IL-Knox IL-Mason IL-Peoria IL-Tazewell IL-Woodford IL-
153 AM CDT Sat Aug 15 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM CDT EARLY THIS 
MORNING FOR NORTHEASTERN MASON, SOUTHERN PEORIA, TAZEWELL, 
SOUTHWESTERN WOODFORD, FULTON AND SOUTHERN KNOX COUNTIES...

At 152 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...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...
  Peoria, Pekin, East Peoria, Morton, Canton, Eureka, Lewistown, 
  Washington, Bartonville, Creve Coeur, West Peoria, Abingdon, 
  Marquette Heights, Farmington, Tremont, Elmwood, Bellevue, 
  Mackinaw, Delavan and Manito.

This includes the following State Parks...
Banner Marsh State Fish and Wildlife Area, Powerton Lake State Fish 
and Wildlife Area, Rice Lake State Fish and Wildlife Area, Sand 
Ridge State Forest, Spring Lake State Fish and Wildlife Area and 
Mackinaw River State Fish and Wildlife Area.

This includes the following highways...
	 Interstate 74 between  mile markers 81 and 112.
	 Interstate 155 between  mile markers 12 and 31.
	 Interstate 474 between  mile markers 0 and 14.

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 4082 9005 4071 8926 4033 8926 4033 9044
      4082 9044

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

$$

Copple

208 
WGUS53 KILX 150835 RRA
FFWILX
ILC057-095-125-143-179-203-151300-
/O.EXT.KILX.FF.W.0064.000000T0000Z-260815T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Lincoln has extended the

* Flash Flood Warning for...
  Northeastern Mason County in central Illinois...
  Southern Peoria County in central Illinois...
  Tazewell County in central Illinois...
  Southwestern Woodford County in central Illinois...
  Fulton County in west central Illinois...
  Southern Knox County in west central Illinois...

* Until 800 AM CDT.

* At 335 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. 
  Additional rainfall amounts of 1 to 3 inches are possible in the 
  warned area. 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...
  Peoria, Pekin, East Peoria, Morton, Canton, Eureka, Lewistown, 
  Washington, Bartonville, Creve Coeur, West Peoria, Abingdon, 
  Marquette Heights, Farmington, Tremont, Elmwood, Bellevue, 
  Mackinaw, Delavan and Manito.

This includes the following State Parks...
Banner Marsh State Fish and Wildlife Area, Powerton Lake State Fish 
and Wildlife Area, Rice Lake State Fish and Wildlife Area, Sand 
Ridge State Forest, Spring Lake State Fish and Wildlife Area and 
Mackinaw River State Fish and Wildlife Area.

This includes the following highways...
	 Interstate 74 between  mile markers 81 and 112.
	 Interstate 155 between  mile markers 12 and 31.
	 Interstate 474 between  mile markers 0 and 14.

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 4082 9005 4071 8926 4033 8926 4033 9044
      4082 9044

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

$$

Copple

346 
WGUS73 KILX 151137
FFSILX

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

ILC057-095-125-143-179-203-151147-
/O.CAN.KILX.FF.W.0064.000000T0000Z-260815T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fulton IL-Knox IL-Mason IL-Peoria IL-Tazewell IL-Woodford IL-
637 AM CDT Sat Aug 15 2026

...FLASH FLOOD WARNING FOR NORTHEASTERN MASON, SOUTHERN PEORIA, 
TAZEWELL, SOUTHWESTERN WOODFORD, FULTON AND SOUTHERN KNOX COUNTIES 
HAS BEEN REPLACED WITH A FLOOD WARNING...

&&

LAT...LON 4082 9005 4071 8926 4033 8926 4033 9044
      4082 9044

$$

Copple

Area Forecast Discussion
National Weather Service Lincoln IL
640 PM CDT Fri Aug 14 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 /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 640 PM CDT Fri Aug 14 2026

Forecast cycle will repeat itself across central Illinois this
evening and overnight as storms once again increase in coverage
in response to a strengthening low level jet. Storms will move
across the central IL terminals late tonight into Saturday
morning. Meanwhile, MVFR ceilings persist just north of PIA/BMI
and are expected to spread south overnight, lowering to IFR
along portions of the I-74 corridor. This next round of precip
will end by around mid morning Saturday with conditions
improving back to VFR as southerly winds overspread the
terminals during the afternoon.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
Flood Watch from 10 PM CDT this evening through Saturday
morning for ILZ027>031-036>038.
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