Flash Flood Warning 22, NWS Lincoln, IL

672 
WGUS73 KILX 111017
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
517 AM CDT Thu Jun 11 2026

ILC167-111027-
/O.EXP.KILX.FF.W.0022.000000T0000Z-260611T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sangamon IL-
517 AM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL SANGAMON COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed any remaining road closures.

&&

LAT...LON 3973 8960 3973 8973 3983 8973 3986 8961
      3983 8958

$$

Geelhart

Area Forecast Discussion
National Weather Service Lincoln IL
1256 AM CDT Thu Jun 11 2026

.KEY MESSAGES...

- Widespread heat continues through Thursday, though increasing
  cloud cover keeps the chance of heat index values exceeding
  100 degrees at around 20 percent south of Interstate 72.

- Thunderstorms will push across central Illinois this
  evening...bringing a risk for damaging wind gusts and
  localized flash flooding.

- A cold front brings another round of severe storms Thursday
  evening and overnight, where damaging straight-line winds
  remain the main concern.

&&

.UPDATE...
Issued at 906 PM CDT Wed Jun 10 2026

Showers and storms continue as forecasted and overall, the
current forecast still looks good on timing of storms moving
across the area. However, did decide to clean up pops/wx and
increased them in the southeast late tonight. Also increased qpf
for tonight and overnight some. Remainder of the forecast for
temps and winds looks fine and will not plan to update the rest
of the night.

New update should be out shortly.

&&

.DISCUSSION...
Issued at 1246 PM CDT Wed Jun 10 2026

Short Term Forecast: Heat and Severe Potential

Today and tomorrow will feature widespread temperatures in the
90s, with heat indices climbing into the upper 90s to lower
100s. Confidence in meeting Heat Advisory criteria (max heat
index near 105F) remains low; LREF probabilities for heat
indices exceeding 100F generally hold around 20 percent for
areas south of I-72. Primary limiting factors for higher heat
readings will be increasing cloud cover and precip chances along
with convective debris, particularly on Thursday for the
latter.

Thunderstorms are ongoing early this afternoon across portions
of eastern Iowa and northeastern Missouri, with additional
development expected to our west later this evening. Out ahead
of the initial convective line, temperatures pushing 90 degrees
and dew points in the low to mid-70s are supporting roughly
1500-2000 J/kg of weakly capped MLCAPE across central Illinois.
Instability will further increase through mid-afternoon, peaking
near 2500 J/kg. Effective bulk shear values will increase to
around 30kt with the arrival of storms, sufficient to support an
organized severe threat.

This initial line of storms is expected to lift northeast,
likely staying near or just north of the I-72 corridor. While
low-level flow is currently veered with unimpressive SRH values,
this is forecast to increase ahead of the second line of
storms. DCAPE values around 900-1200 J/kg, coupled with
increasingly steep low-level lapse rates, will support a wind
threat with the first wave of convection. Round two will see
strengthened kinematic fields as storms congeal into a line and
spread ESE across central Illinois late this evening. Damaging
winds will remain the primary threat, though interactions with
remnant outflow boundaries and increasing low-level winds
associated with a strengthening low-level jet will support a
localized tornado threat this evening. This threat will slowly
subside with waning diurnal instability as the system moves east
overnight.

In addition to the severe potential, multiple rounds of storms--
including the possibility for backbuilding and training--pose a
localized flooding threat. Corfidi vectors ahead of the second
line of storms drop below 10 kt and become oriented out of the
northeast, suggesting potential for backbuilding along the
southern periphery of the QLCS. While the severe threat should
diminish overnight, the hydro threat may linger well into or
through the overnight hours.

Thursday and Extended Period
A robust shortwave trough is expected to lift into the Upper
Midwest on Thursday, driving a cold front through central
Illinois Thursday evening and overnight. Ahead of this boundary,
the GFS suggests a broad, unstable warm sector with MLCAPE
values exceeding 3000 J/kg. Coupled with deep-layer shear of
25-35 kt and 0-1km shear of 15-25 kt, the kinematic environment
remains seasonably strong Thursday. While pre-frontal discrete
activity with all severe hazards is possible, the primary
concern remains straight-line winds as convective elements
congeal into a line along and ahead of the front.

Lingering showers and storms over southeast Illinois on Friday
morning will exit quickly, giving way to clearing skies as high
pressure builds into the region. This will provide a brief
return to more seasonal conditions, with highs in the lower to
mid-80s and dew points mixing down into the upper 50s, resulting
in a much more comfortable air mass.

For the weekend and into early next week, the pattern turns
more zonal aloft while a low-level baroclinic zone wobbles over
the region. This setup maintains additional chances for showers
and thunderstorms, though specifics regarding timing and
coverage remain uncertain at this forecast range.

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 1255 AM CDT Thu Jun 11 2026

Rain and scattered embedded storms are still ongoing around most
of the sites, except PIA and BMI. Will continue either VCTS or a
TEMPO group for SPI, DEC, and CMI for another 3-4 hrs overnight.
All sites should be dry for late tonight and through the morning
hours. Then another round of storms will be possible late
tomorrow afternoon through early tomorrow evening. Have already
placed TEMPO groups for all sites for thunderstorms. Winds will
become breezy tomorrow afternoon as well ahead of the storms.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 7 AM CDT this morning for ILZ027>031-036>038-
040>043-047>051.

&&

KEY MESSAGES...Deubelbeiss
UPDATE...Auten/Erwin
DISCUSSION...Barnes
AVIATION...Auten

Hazardous Weather Outlook
National Weather Service Lincoln IL
210 PM CDT Wed Jun 10 2026

ILZ027>031-036>038-040-041-111915-
Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler-
Mason-
210 PM CDT Wed Jun 10 2026

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

.DAY ONE...Tonight.

A couple waves of severe thunderstorms are possible (30-45% chance)
this afternoon into tonight. The primary threat will be damaging
winds in excess of 70 mph, though large hail and a tornado or two are
also possible. Areas of flash flooding are also a concern.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The heat index will again reach 100 degrees on Thursday.

Another round of severe thunderstorms is expected Thursday evening.
The primary risk remains with damaging winds over 70 mph, but large
hail and tornadoes are also possible. Flash flooding is also a
concern, especially wherever heavy rain falls today.

Additional thunderstorms are expected Saturday night. The severe
weather risk is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed this afternoon and evening.

Expected storm motion is toward the northeast around 35 mph.

ILZ042>057-061-111915-
Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott-Morgan-
Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby-
210 PM CDT Wed Jun 10 2026

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

.DAY ONE...Tonight.

Strong to severe thunderstorms are expected to move across the area
this evening. The primary risk is damaging winds in excess of 60 mph,
although large hail and a tornado or two are also possible. There is
also a risk for flash flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The heat index will again reach 100 degrees on Thursday.

Another round of severe thunderstorms is expected Thursday evening.
The primary risk is with damaging winds over 70 mph, though large
hail and a few tornadoes are also possible. Flash flooding is also a
concern, especially where heavy rain falls today.

Additional thunderstorms are expected Saturday night. The severe
weather risk is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

Expected storm motion is toward the northeast around 35 mph.

ILZ062-063-066>068-071>073-111915-
Cumberland-Clark-Effingham-Jasper-Crawford-Clay-Richland-Lawrence-
210 PM CDT Wed Jun 10 2026

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

.DAY ONE...Tonight.

A decaying line of thunderstorms will move into the area after 9 pm.
While the severe weather risk will be decreasing, isolated damaging
wind gusts remain a concern.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

A line of severe thunderstorms is expected Thursday evening,
lingering after midnight. The primary risk is with damaging winds
over 60 mph, though large hail and a tornado or two are also
possible.

Additional thunderstorms are expected Saturday night. The severe
weather risk is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated tonight.

Deubelbeiss

Preliminary Local Storm Report
National Weather Service Lincoln IL
1253 AM CDT Thu Jun 11 2026

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

1050 PM     Tstm Wnd Dmg     3 NE Tallula            39.97N 89.89W
06/10/2026                   Menard             IL   Law Enforcement

            Multiple sheds completely destroyed, utility
            poles missing, 30 foot grain bin destroyed
            and blown into a house. Possible tornado.

&&

Geelhart

Preliminary Local Storm Report
National Weather Service Lincoln IL
1259 AM CDT Thu Jun 11 2026

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

1052 PM     Tstm Wnd Dmg     2 S Petersburg          39.98N 89.85W
06/10/2026                   Menard             IL   Law Enforcement

            Heavy tree damage at Lincolns New Salem
            State Park.

&&

Geelhart

Preliminary Local Storm Report
National Weather Service Lincoln IL
106 AM CDT Thu Jun 11 2026

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

1105 PM     Tstm Wnd Dmg     2 E Capital Airport     39.84N 89.64W
06/10/2026                   Sangamon           IL   Broadcast Media

            Trees and power poles down on Taintor Rd
            along the north edge of the state
            fairgrounds.

&&

Geelhart

Preliminary Local Storm Report
National Weather Service Lincoln IL
151 AM CDT Thu Jun 11 2026

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

1105 PM     Tstm Wnd Dmg     1 E Capital Airport     39.84N 89.66W
06/10/2026                   Sangamon           IL   Emergency Mngr

            Debris from a metal building blown on both
            sides of highway 29 at the airport entrance.

1114 PM     Tstm Wnd Dmg     1 N Clear Lake          39.83N 89.57W
06/10/2026                   Sangamon           IL   Emergency Mngr

            Part of a metal building had its roof
            collapsed.

&&

Geelhart

Preliminary Local Storm Report
National Weather Service Lincoln IL
205 AM CDT Thu Jun 11 2026

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

0200 AM     Flash Flood      3 NNE Grandview         39.85N 89.61W
06/11/2026                   Sangamon           IL   Broadcast Media

            Underpass on Dirksen Pkwy with about 2 feet
            of water, and several other nearby roads
            filling with water.

&&

Geelhart

Preliminary Local Storm Report
National Weather Service Lincoln IL
209 AM CDT Thu Jun 11 2026

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

1200 AM     Flash Flood      2 E Bloomington         40.47N 88.96W
06/11/2026                   McLean             IL   Public

            Significant roadway flooding near Four
            Seasons Road in Bloomington, with around 2
            to 3 feet of standing water.

1200 AM     Flood            2 WNW Normal            40.52N 89.02W
06/11/2026                   McLean             IL   Public

            Standing water reported on Parkside Road
            near Normal Community West High School and
            Champion Fields.

&&

Geelhart