Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Lincoln, IL

June 26, 20219 counties in Illinois

NWS Lincoln, IL issued this flash flood warning at Jun 26, 2021, 3:25 PM CDT for 9 counties in Illinois. It was in force for 4 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 26, 2021, 3:25 PM CDT (20:25 UTC)
Expired
Jun 26, 2021, 7:48 PM CDT
In force
4 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

Counties DeWitt County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Sangamon County, IL, Tazewell County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 61 km from the middle of the area, began a volume at 20:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 26, 4:00 PM CDTHEAVY RAIN 1.62Nws Lincoln, ILDAILY TOTAL AS OF 4PM, 1.43 FELL BETWEEN 1PM AND 4PM CDT.
Jun 26, 4:27 PM CDTFLASH FLOODDowns, ILI-74 IS FLOODED NEAR THE DOWNS EXIT.
Jun 26, 4:30 PM CDTFLASH FLOODBloomington, ILSEVERAL INTERSECTIONS FLOODED. NUMEROUS CARS STRANDED REQUIRING TOW TRUCKS, BUT NO WATER RESCUES REPORTED.
Jun 26, 4:40 PM CDTHEAVY RAIN 1.821 Ene Logan County Airp, ILMEASURED FROM RAIN IN PAST 9 HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.4 hours before the alert went out and 52 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2021-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 683 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2021-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
683 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
684 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.1

Open this sounding in Storm Lab

The text

As transmitted.

984 
WGUS53 KILX 262025
FFWILX
ILC039-107-113-115-125-129-167-179-203-270115-
/O.NEW.KILX.FF.W.0011.210626T2025Z-210627T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
325 PM CDT Sat Jun 26 2021

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Western De Witt County in central Illinois...
  Logan County in central Illinois...
  McLean County in central Illinois...
  Northwestern Macon County in central Illinois...
  Southeastern Mason County in central Illinois...
  Northeastern Menard County in central Illinois...
  Sangamon County in central Illinois...
  Southeastern Tazewell County in central Illinois...
  Southeastern Woodford County in central Illinois...

* Until 815 PM CDT.

* At 324 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Bloomington, Lincoln, Clinton, Mason City, Normal, Le Roy, 
  Heyworth, El Paso, Lexington, Hudson, Chenoa, Atlanta, Mount 
  Pulaski, Gridley, Minier, Danvers, Colfax, Downs, Hopedale and 
  McLean.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 4032 8954 4060 8919 4079 8893 4075 8893
      4075 8888 4076 8878 4076 8874 4076 8858
      4069 8858 4067 8858 4065 8858 4065 8857
      4061 8857 4061 8855 4061 8853 4061 8846
      3993 8915 4004 8990

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR 

$$

Barnes
2 follow-up statements
417 
WGUS73 KILX 262142
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
442 PM CDT Sat Jun 26 2021

ILC167-262152-
/O.CAN.KILX.FF.W.0011.000000T0000Z-210627T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sangamon IL-
442 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR ...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flash Flood Watch remains in effect until 700 AM CDT Sunday for 
portions of central Illinois...east central Illinois and west 
central Illinois.

LAT...LON 4032 8954 4060 8919 4079 8893 4075 8893
      4075 8888 4076 8878 4076 8874 4076 8858
      4069 8858 4067 8858 4065 8858 4065 8857
      4061 8857 4061 8855 4061 8853 4061 8846
      3993 8915 4004 8990

$$

ILC039-107-113-115-125-129-179-203-270115-
/O.CON.KILX.FF.W.0011.000000T0000Z-210627T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Witt IL-Logan IL-McLean IL-Macon IL-Mason IL-Menard IL-Tazewell
IL-Woodford IL-
442 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM CDT THIS 
EVENING FOR WESTERN DE WITT, LOGAN, MCLEAN, NORTHWESTERN MACON, 
SOUTHEASTERN MASON, NORTHEASTERN MENARD, SOUTHEASTERN TAZEWELL AND 
SOUTHEASTERN WOODFORD COUNTIES...

At 437 PM CDT, emergency management reported numerous flooded roads 
in Bloomington-Normal, including a few stranded cars in high water.  
The heaviest rain has ended: however, flash flooding will be ongoing 
for the next couple of hours.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Bloomington, Lincoln, Clinton, Mason City, Normal, Le Roy, 
  Heyworth, El Paso, Lexington, Hudson, Chenoa, Atlanta, Mount 
  Pulaski, Gridley, Minier, Danvers, Colfax, Downs, Hopedale and 
  McLean.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 4032 8954 4060 8919 4079 8893 4075 8893
      4075 8888 4076 8878 4076 8874 4076 8858
      4069 8858 4067 8858 4065 8858 4065 8857
      4061 8857 4061 8855 4061 8853 4061 8846
      3993 8915 4004 8990

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR 

$$

Barnes
695 
WGUS73 KILX 270048
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
748 PM CDT Sat Jun 26 2021

ILC039-107-113-115-125-129-179-203-270058-
/O.CAN.KILX.FF.W.0011.000000T0000Z-210627T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Witt IL-Logan IL-McLean IL-Macon IL-Mason IL-Menard IL-Tazewell
IL-Woodford IL-
748 PM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR WESTERN DE WITT, LOGAN, 
MCLEAN, NORTHWESTERN MACON, SOUTHEASTERN MASON, NORTHEASTERN MENARD, 
SOUTHEASTERN TAZEWELL AND SOUTHEASTERN WOODFORD COUNTIES...

The heavy rain has ended, though issues from rainfall over the past 
few days continues. Please continue to heed remaining road closures.

LAT...LON 4032 8954 4060 8919 4079 8893 4075 8893
      4075 8888 4076 8878 4076 8874 4076 8858
      4069 8858 4067 8858 4065 8858 4065 8857
      4061 8857 4061 8855 4061 8853 4061 8846
      3993 8915 4004 8990

$$

NMB

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 25, 7:21 PM CDTSevere Thunderstorm WarningILXLogan, Mason, Tazewell39 min
Jun 25, 7:33 PM CDTSpecial Weather StatementILXMcLean42 min
Jun 25, 7:38 PM CDTSevere Thunderstorm WarningILXMorgan, Scott67 min
Jun 25, 7:53 PM CDTSevere Thunderstorm WarningILXDeWitt, Logan, McLean, Tazewell67 min
Jun 25, 8:16 PM CDTSevere Thunderstorm WarningILXCass, Menard, Morgan, Sangamon44 min
Jun 25, 8:29 PM CDTTornado WarningILXMcLean30 min
Jun 25, 8:49 PM CDTSevere Thunderstorm WarningILXDeWitt, McLean, Macon, Piatt41 min
Jun 25, 8:54 PM CDTFlash Flood WarningILXDeWitt, Logan, McLean, Mason, Tazewell6 hr
Jun 25, 9:05 PM CDTSevere Thunderstorm WarningILXLogan, Mason, Menard, Tazewell25 min
Jun 25, 9:47 PM CDTFlash Flood WarningILXMorgan, Scott6 hr
Jun 25, 9:59 PM CDTFlash Flood WarningILXDeWitt, McLean, Piatt5 hr
Jun 25, 10:18 PM CDTSevere Thunderstorm WarningILXChampaign, Coles, DeWitt, Douglas, Macon, Moultrie and 1 more27 min
Jun 26, 2:34 AM CDTAreal Flood WarningILXDeWitt, Logan, McLean, Mason, Piatt, Tazewell61 hr
Jun 26, 6:03 AM CDTRiver Flood WarningILXPiatt8 days
Jun 26, 9:44 AM CDTRiver Flood WarningILXMason, Menard4 days
Jun 26, 12:21 PM CDTTornado WarningILXMcLean24 min
Jun 26, 1:24 PM CDTTornado WarningILXMorgan, Scott36 min
Jun 26, 1:53 PM CDTTornado WarningILXMorgan37 min
Jun 26, 2:17 PM CDTTornado WarningILXMorgan, Sangamon28 min
Jun 26, 2:38 PM CDTTornado WarningILXMcLean, Woodford37 min
Jun 26, 3:12 PM CDTTornado WarningILXMcLean33 min
Jun 26, 3:19 PM CDTTornado WarningILXLogan, Sangamon26 min
Jun 26, 3:33 PM CDTSevere Thunderstorm WarningILXLogan27 min
Jun 26, 3:37 PM CDTTornado WarningILXMcLean23 min
Jun 26, 3:39 PM CDTTornado WarningILXLogan, Sangamon36 min
Jun 26, 4:04 PM CDTTornado WarningILXDeWitt26 min
Jun 26, 4:43 PM CDTSevere Thunderstorm WarningILXChampaign, DeWitt, McLean, Piatt32 min
Jun 26, 5:16 PM CDTSevere Thunderstorm WarningILXChampaign, DeWitt, McLean, Piatt44 min
Jun 26, 5:47 PM CDTTornado WarningILXDouglas, Moultrie, Piatt43 min
Jun 26, 5:50 PM CDTSevere Thunderstorm WarningILXVermilion40 min
Jun 26, 6:03 PM CDTTornado WarningILXChampaign, Douglas27 min
Jun 26, 6:24 PM CDTSevere Thunderstorm WarningILXChampaign, Douglas, Edgar, Vermilion81 min

Nearby

Flash Flood Warnings in Illinois, 2021Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.