Special Weather Statement, NWS Lincoln, IL

Area Forecast Discussion
National Weather Service Lincoln IL
1211 AM CDT Sat Aug 22 2026

.KEY MESSAGES...

- A Slight Risk of severe thunderstorms exists this evening
  along and north of a line from Beardstown to Lincoln to Gibson
  City. Hail (15%), wind (15%), and tornado (2%) threats will
  exist in this area, with lower probabilities further south to
  near I-70.

&&

.DISCUSSION...
Issued at 215 AM CDT Fri Aug 21 2026

Weak high pressure ridge ~1018 mb was over near central IL early
this afternoon and providing a delightful late summer day with
mostly sunny skies. Temperatures were in the lower 80s at 2 pm
while dewpoints were in the mid to upper 60s except lower 70s
from Galesburg and Macomb west/nw. A weak cold front was over
central WI into southeast Iowa. Radar mosaic shows scattered
convection over northern IL from I-88 north into southern WI and
tracking ESE. Moderately unstable airmass in place over the IL
river valley where MLCAPES 1500-2500 j/kg nw of I-55 while bulk
shear values of 30-35 kts over IL river valley and over 40 kts
west of IL over central and northern MO. SPC just issued a
mesoscale discussion over northern half of IL north of Lincoln
where severe storm threat is increasing and monitoring a possible
watch box. HRRR and RRFS models show broken band of convection
moving into far northern CWA just after sunset and toward I-55
by late evening, and weakening as it moves toward I-70 around 3
am. SPC continues slight risk of severe storms this evening
along and north of a line from Beardstown to Lincoln to Gibson
City. Hail (15%), wind (15%), and tornado (2%) threats will
exist in the Slight Risk area. CAPES reach 2000-3000 j/kg over
the IL river valley nw of I-55 while wind shear values 30-40 kts
and also in favorable region of se moving upper level jet for
enhanced lift. Further south a Marginal Risk exists as far
southeast as near I-70, with mainly low end hail/wind (5%)
threats for this evening in this area. WPC Day1 outlook has
marginal risk of excessive rainfall over northern CWA this
evening where pockets of 1 inch or more of rain possible on a
saturated ground. But convection bands will be more progressive
than Wed night system so rainfall amounts should be much lower.

Quieter weather is generally expected this weekend into early
next week over central/se IL, though a few model members show
isolated convection (20% or less) over ne CWA Sat afternoon
where MUCAPES get to 1000-1500 j/kg. The stronger short wave
forcing is ne of CWA Sat afternoon over ne IL into northern IN
where better chance of convection will be. A Northwest upper
level flow to prevail over IL through middle of next week with
strong mid/upper level ridge over Southwest States and upper
level low/trof in eastern Canada and northeast US. Another
northern stream short wave disturbance to move se into the
Midwest for middle of next week and bring next chance of
convection around Wednesday though current NBM just has slight
pops over area. Temps to be near a bit below normal early next
week with highs in the upper 70s to lower 80s Sun/Monday and
coolest night Sunday night with lows in mid to upper 50s. Temps
moderate a bit for middle of next week along with increasing
humidity levels/dewpoints with highs back in the low to mid 80s
Tue-Fri (mid to upper 80s southern CWA Wed-Fri).

The Climate Prediction Center (CPC) 8-14 Day Outlook for Aug
29-Sep 4 has 40-50% chance of above normal temperatures over
central/se IL and precipitation trending near normal except
slight above normal near the Indiana border.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1210 AM CDT Sat Aug 22 2026

A line of thunderstorms will continue southeast across central
Illinois during the early overnight hours, but should be clear
of the I-72 terminals by around 07Z. Behind the storms, winds
will gradually set up out of the northwest the remainder of the
period, picking up into the 10-12kt range during the day
Saturday.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
None.

&&

KEY MESSAGES...07
DISCUSSION...07
AVIATION...Deubelbeiss

Hazardous Weather Outlook
National Weather Service Lincoln IL
138 PM CDT Fri Aug 21 2026

ILZ027>031-036>038-040>057-061>063-066>068-071>073-221845-
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-
138 PM CDT Fri Aug 21 2026

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

.DAY ONE...Tonight.

Scattered thunderstorms are possible (30-50% chance) this evening
into tonight. Damaging wind gusts and heavy rain are the main
hazards, however isolated large hail and a brief tornado cannot be
ruled out.

Due to recent heavy rainfall, river flooding is occurring on
portions of the Illinois, Sangamon, and Wabash rivers.

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

Flooding will continue for several days along portions of the
Illinois, Sangamon, and Wabash Rivers.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later tonight.

NMA

Special Weather Statement
National Weather Service Lincoln IL
1033 PM CDT Fri Aug 21 2026

ILZ029-037-220415-
Tazewell-Peoria-
1033 PM CDT Fri Aug 21 2026

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL TAZEWELL AND SOUTH
CENTRAL PEORIA COUNTIES THROUGH 1115 PM CDT...

At 1033 PM CDT, Doppler radar was tracking a strong thunderstorm over
Mapleton, or near Pekin, moving southeast at 40 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Peoria, Pekin, East Peoria, Morton, Bartonville, Creve Coeur,
Marquette Heights, Tremont, Bellevue, Mackinaw, Delavan, South Pekin,
Glasford, Hopedale, Green Valley, Mapleton, Peoria International
Airport, North Pekin, Dillon, and Groveland.

This includes the following highways...
 Interstate 155 between mile markers 15 and 29.
 Interstate 474 between mile markers 5 and 12.

This also includes Powerton Lake State Fish and Wildlife Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
central Illinois.

&&

LAT...LON 4059 8982 4069 8966 4048 8927 4032 8956
TIME...MOT...LOC 0333Z 317DEG 35KT 4060 8971

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Auten

Special Weather Statement
National Weather Service Lincoln IL
1109 PM CDT Fri Aug 21 2026

ILZ037-042-220445-
Tazewell-Logan-
1109 PM CDT Fri Aug 21 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN LOGAN AND
SOUTHEASTERN TAZEWELL COUNTIES THROUGH 1145 PM CDT...

At 1109 PM CDT, Doppler radar was tracking a strong thunderstorm over
Delavan, or 13 miles southeast of Pekin, moving southeast at 30 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Tremont, Delavan, South Pekin, Hopedale, Emden, Armington, and
Dillon.

This includes Interstate 155 between mile markers 6 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
central Illinois.

&&

LAT...LON 4049 8967 4056 8954 4032 8929 4021 8955
TIME...MOT...LOC 0409Z 325DEG 27KT 4040 8952

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

Deubelbeiss

Special Weather Statement
National Weather Service Lincoln IL
1241 AM CDT Sat Aug 22 2026

ILZ050>052-220630-
Sangamon-Morgan-Christian-
1241 AM CDT Sat Aug 22 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN CHRISTIAN...
SOUTHWESTERN SANGAMON AND SOUTHEASTERN MORGAN COUNTIES THROUGH 130 AM
CDT...

At 1241 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Rochester to near Loami. Movement was
south at 30 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Springfield, Chatham, Auburn, Rochester, Pawnee, Kincaid, New Berlin,
Waverly, Divernon, Edinburg, Loami, Jeisyville, Jerome, Southern
View, Leland Grove, Grandview, Thayer, Tovey, Clear Lake, and
Bulpitt.

This includes the following highways...
 Interstate 55 between mile markers 77 and 99.
 Interstate 72 between mile markers 83 and 107.

This also includes Sangchris Lake State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3980 8993 3984 8942 3951 8935 3950 8953
      3952 8954 3952 8997
TIME...MOT...LOC 0541Z 349DEG 26KT 3973 8948 3970 8988

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Deubelbeiss

Preliminary Local Storm Report
National Weather Service Lincoln IL
1243 AM CDT Sat Aug 22 2026

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

1238 AM     Hail             Springfield             39.80N 89.64W
08/22/2026  M0.88 Inch       Sangamon           IL   Broadcast Media

&&

BMD

Preliminary Local Storm Report
National Weather Service Lincoln IL
1245 AM CDT Sat Aug 22 2026

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

1239 AM     Hail             1 NE Curran             39.75N 89.75W
08/22/2026  E0.75 Inch       Sangamon           IL   Public

            Penny size hail near West Wabash & I-72.

&&

BMD

Special Weather Statement
National Weather Service Lincoln IL
107 AM CDT Sat Aug 22 2026

ILZ052-220645-
Christian-
107 AM CDT Sat Aug 22 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHERN CHRISTIAN COUNTY
THROUGH 145 AM CDT...

At 106 AM CDT, Doppler radar was tracking a strong thunderstorm near
Jeisyville, or 7 miles west of Taylorville, moving southeast at 35
mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Taylorville, Kincaid, Morrisonville, Owaneco, Jeisyville, Tovey,
Rosamond, Palmer, Bulpitt, Willeys, Sharpsburg, Taylorville Municipal
Airport, and Langleyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3935 8953 3956 8953 3969 8932 3947 8904
      3935 8915 3934 8936
TIME...MOT...LOC 0606Z 335DEG 29KT 3952 8943

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Deubelbeiss