Flash Flood Warning 26, NWS Lincoln, IL

705 
WGUS73 KILX 120232
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
932 PM CDT Thu Jun 11 2026

ILC039-107-115-147-120415-
/O.CON.KILX.FF.W.0026.000000T0000Z-260612T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Witt IL-Logan IL-Macon IL-Piatt IL-
932 PM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT THIS 
EVENING FOR DE WITT, EASTERN LOGAN, NORTHERN MACON AND CENTRAL PIATT 
COUNTIES...

At 932 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Flooding impacts will continue, but no additional rainfall 
is expected. 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...
  Clinton, Monticello, Maroa, Atlanta, Warrensburg, Argenta, 
  Wapella, Waynesville, Weldon, Latham, Kenney, Cisco, Chestnut, 
  Beason, Weldon Springs State Park, Lane, Hallsville, Clinton Power 
  Station and Midland City.

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.

&&

LAT...LON 4013 8869 4005 8847 3998 8847 3996 8875
      3992 8927 4028 8927 4028 8915

FLASH FLOOD...RADAR INDICATED

$$

37

072 
WGUS73 KILX 120411
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
1111 PM CDT Thu Jun 11 2026

ILC039-107-115-147-120421-
/O.EXP.KILX.FF.W.0026.000000T0000Z-260612T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Witt IL-Logan IL-Macon IL-Piatt IL-
1111 PM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 1115 PM CDT THIS EVENING FOR 
DE WITT, EASTERN LOGAN, NORTHERN MACON AND CENTRAL PIATT COUNTIES...

The rain has ended and flood waters are receding. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

&&

LAT...LON 4013 8869 4005 8847 3998 8847 3996 8875
      3992 8927 4028 8927 4028 8915

$$

37

Area Forecast Discussion
National Weather Service Lincoln IL
Issued by National Weather Service Sioux Falls SD
654 PM CDT Thu Jun 11 2026

.KEY MESSAGES...

- A line of severe thunderstorms is forecast to produce damaging
  winds and several embedded tornadoes across central Illinois
  this evening (risk level 4 of 5). The window for the most
  intense storms will be 4-10pm.

- While the risk is lower (level 2 of 4), there could be some
  localized flooding with these storms as well, especially north
  of I-72 and west of I-57 where many locations received
  several inches of rainfall yesterday.

- More showers and thunderstorms are likely (60-80% chance)
  Saturday night, with a level 1 of 5 (marginal) risk for
  severe weather and excessive rainfall.

&&

.DISCUSSION...
Issued at 230 PM CDT Thu Jun 11 2026

***** SEVERE WEATHER OUTBREAK THIS EVENING *****

At 230pm, temperatures and dewpoints across central and southeast
Illinois were in the mid-upper 80s and mid 70s, respectively amidst
southerly flow, evapotranspiration "ET" (mostly evaporation this
early in the growing season), and sunshine. RAP mesoanalysis
suggests this is contributing to MLCAPE values of 1000-3500 J/kg - a
sharp gradient across the area with higher values to the south.
Surface heating should continue to boost both temperatures and
instability and reduce convective inhibition (CIN) throughout the
afternoon ahead of an approaching cold front, which will sweep the
area west-east during the mid to late evening hours. RAP/HRRR/NAM
suggest MLCAPE will peak around 4000-5000 J/kg with 35-45 kt deep
layer shear ahead of that front, which should provide sufficient
forcing to maintain the ongoing storms across west-central IL and
result in development further to the south. This highly volatile
convective environment should favor organized convection capable
initially of all severe hazards (tornadoes, large hail, and damaging
winds), with an increasing wind and quasilinear convective system
(QLCS) tornado threat as storms grow quickly upscale into bowing
lines. PWATs approaching 2 inches will favor precip loading,
especially in the taller cores which will feature melting hail,
while steep mid level lapse rates and wide CAPE profiles will
enhance potential for RIJ formation in bowing segments; this will
increase the risk for high-end (75+ mph) and long-duration (20+
minutes) straight-line winds which would result in swaths of
enhanced damage (trees down, shingle damage, power outages). SPC has
issued a level 4 of 5, "moderate," risk for severe weather, driven
by wind and tornadoes, which could be strong north of a Macomb to
Bloomington line. Winds ahead of these storms may gust up to 40 mph
from the south, as descending hydrometeors from anvils aid in
momentum transport from a 40-50 kt LLJ (strongest over northern IL).

***** LOW RISK FOR FLASH FLOODING *****

With some locations north of I-72 and west of I-57 having received
over 3 inches of rainfall yesterday (and multiple rounds of heavy
rainfall in days prior), there is concern that flash flooding could
occur with storms this afternoon and evening. This is especially
true with the ongoing training storms north of a roughly Macomb to
El Paso line. 3 hour FFG in some of these areas is under a half an
inch, and with various CAMs advertising 1 hour rain rates >1 inch it
makes sense there could be some issues, especially in urban and poor
drainage areas. A Flood Watch was issued for Cass to Dewitt, and
counties further north, in effect until 9pm.

***** LESS WARM AND MUGGY STARTING TONIGHT *****

Behind the cold front, conditions will turn much less humid and,
with some clearing, temperatures are forecast to fall into the mid
to upper 50s overnight west of roughly I-57. High temperatures
tomorrow should only climb into the low 80s, making it feel much
more pleasant heading into the weekend. Warm air advection (WAA)
will bring a slightly more humid airmass into the region tomorrow
night into Saturday ahead of another shortwave trough, but
convection to our southwest should limit the northward extent of
deep layer moisture - resulting in a low (albeit nonzero) risk for
severe weather and heavy rainfall Saturday/night in our neck of the
woods. Both SPC and WPC have us in marginal risks for each hazard.

Behind that second front, much cooler conditions return, with NBM
only giving a 15-30% chance high temperatures reach 75 degrees on
Sunday. Temperatures are slated to moderate gradually towards the
middle of next week, as southwest flow returns ahead of the next
upper level low pressure system.

&&

.AVIATION /00Z TAFS THROUGH 00Z SATURDAY/...
Issued at 640 PM CDT Thu Jun 11 2026

Strong to severe thunderstorms are currently moving through the
area. These storms are currently producing strong winds with
recorded gusts up to about 50 knots or potentially greater. A
tornado is also possible with this line of storms as it pushes
through the area. These storms are moving through quickly though
and will exit the area between 01z to 02z. Brief drops to MVFR
ceilings is expected in the storms and potentially for an hour
or so behind them as well. Visibility will drop to IFR levels
within the storm. The good news is that quiet conditions will
return in the wake of the departing thunderstorms. Winds will
remain out of the northwest before weakening this evening while
backing to out of the west. With calmer winds in place, there
could be isolated patches of fog or low stratus. However, the
probability of fog or low ceilings is low at a <=20% chance.
Have kept this potential omitted from all TAFs at this time but
trends will be monitored through the night. Otherwise, light
west/northwest winds are expected for the rest of the TAF period
as high pressure moves into the region.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 9 PM CDT this evening for ILZ027>031-036>038-
040>043-047-048.

&&

KEY MESSAGES...Bumgardner
DISCUSSION...Bumgardner
AVIATION...Meyers

Hazardous Weather Outlook
National Weather Service Lincoln IL
405 PM CDT Thu Jun 11 2026

ILZ027>031-036>038-040>057-061-122115-
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-
405 PM CDT Thu Jun 11 2026

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

.DAY ONE...Tonight.

Severe thunderstorms are expected through this evening. Damaging
winds over 70 mph, large hail, and tornadoes are all possible with
the strongest storms. Heavy rain may also lead to flash flooding,
especially where heavy rain fell the last several days.

River flooding is ongoing or expected to develop along the Spoon, La
Moine, Illinois and Mackinaw Rivers.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional thunderstorms are expected Saturday night. A few of these
will be capable of producing strong wind gusts.

River flooding is ongoing or expected to develop along the Spoon, La
Moine, Mackinaw, and Illinois Rivers.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed through late this evening.

Expected storm motion is toward east between 35-45 mph.

ILZ062-063-066>068-071>073-122115-
Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence-
405 PM CDT Thu Jun 11 2026

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

.DAY ONE...Tonight.

A line of severe thunderstorms is expected to move across the area
this evening. These storms will be capable of damaging wind gusts
and a couple tornadoes. In addition, locally heavy rain may
aggravate any lingering flooding from recent storms.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional thunderstorms are expected Saturday night. A few of these
will be capable of producing strong wind gusts.

Minor flooding will continue along the Wabash River into next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed through late this evening.

Expected storm motion is toward the east-southeast around 35-45 mph.

NMA

Preliminary Local Storm Report
National Weather Service Lincoln IL
708 PM CDT Thu Jun 11 2026

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

0617 PM     Tstm Wnd Dmg     1 WSW Deer Creek        40.62N 89.36W
06/11/2026                   Tazewell           IL   Trained Spotter

            Semi-truck blown over, multiple vehicle in
            ditch. Possible tornado. Time estimated by
            radar.

0653 PM     Tstm Wnd Dmg     Clinton                 40.15N 88.95W
06/11/2026                   De Witt            IL   Trained Spotter

            Tree down blocking Highway 54.

0658 PM     Tstm Wnd Gst     3 SW Chestnut           40.02N 89.22W
06/11/2026  M70 MPH          Logan              IL   Trained Spotter

            Report relayed by county EM.

0706 PM     Tstm Wnd Gst     Saybrook                40.43N 88.53W
06/11/2026  E60 MPH          McLean             IL   Emergency Mngr

0706 PM     Tstm Wnd Dmg     Saybrook                40.43N 88.53W
06/11/2026                   McLean             IL   Emergency Mngr

            Tree limbs blown down.

&&

Erwin

Preliminary Local Storm Report
National Weather Service Lincoln IL
709 PM CDT Thu Jun 11 2026

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

0637 PM     Tstm Wnd Dmg     Atlanta                 40.26N 89.23W
06/11/2026                   Logan              IL   Emergency Mngr

            Power lines blown down.

0640 PM     Tstm Wnd Dmg     Lincoln                 40.15N 89.36W
06/11/2026                   Logan              IL   Emergency Mngr

            Power lines down.

&&

Erwin

Preliminary Local Storm Report
National Weather Service Lincoln IL
712 PM CDT Thu Jun 11 2026

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

0620 PM     Tstm Wnd Dmg     1 SE Morton             40.60N 89.45W
06/11/2026                   Tazewell           IL   Public

            Large tree branches blown down, brick sign
            and courtyard umbrella damaged. Time
            estimated by radar.

0700 PM     Tstm Wnd Gst     Latham                  39.97N 89.16W
06/11/2026  E75 MPH          Logan              IL   Emergency Mngr

&&

Erwin

Preliminary Local Storm Report
National Weather Service Lincoln IL
718 PM CDT Thu Jun 11 2026

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

0652 PM     Tstm Wnd Dmg     Clinton                 40.16N 88.97W
06/11/2026                   De Witt            IL   Emergency Mngr

            Tree limbs down onto a house, resulting in
            damage to the fascia and siding. Time
            estimated by radar.

0700 PM     Tstm Wnd Gst     Le Roy                  40.35N 88.77W
06/11/2026  M78 MPH          McLean             IL   Mesonet

            Personal weather station.

0710 PM     Flash Flood      4 SSE NWS Lincoln       40.09N 89.31W
06/11/2026                   Logan              IL   Emergency Mngr

            Route 121 and 1200th Street completely
            flooded with water flowing over the roadway.

&&

Erwin

Preliminary Local Storm Report
National Weather Service Lincoln IL
720 PM CDT Thu Jun 11 2026

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

0709 PM     Tstm Wnd Dmg     1 N Bellflower          40.35N 88.53W
06/11/2026                   McLean             IL   Emergency Mngr

            Power poles blown down blocking the road.

&&

Erwin

Preliminary Local Storm Report
National Weather Service Lincoln IL
723 PM CDT Thu Jun 11 2026

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

0653 PM     Tstm Wnd Dmg     Kenney                  40.10N 89.08W
06/11/2026                   De Witt            IL   Emergency Mngr

            Power lines blown down on Kenney Street.

0719 PM     Tstm Wnd Dmg     3 SSW Mahomet           40.16N 88.43W
06/11/2026                   Champaign          IL   Emergency Mngr

            Power lines down at intersection of 1900N
            and 200E.

&&

Erwin