Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Lincoln, IL

May 3, 2021Coles County, Illinois

NWS Lincoln, IL issued this flash flood warning at May 3, 2021, 8:53 PM CDT for Coles County, Illinois. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 3, 2021, 8:53 PM CDT (01:53 UTC)
Expired: May 3, 2021, 9:43 PM CDT
In force: 50 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

County Coles County, IL

The radar

The Lincoln radar (KILX), 122 km from the middle of the area, began a volume at 01:52 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.9 hours before the alert went out and 81 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 758 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

625 
WGUS53 KILX 040153
FFWILX
ILC029-040500-
/O.NEW.KILX.FF.W.0001.210504T0153Z-210504T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
853 PM CDT Mon May 3 2021

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Southern Coles County in east central Illinois...

* Until midnight CDT.

* At 852 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. 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...
  Charleston, Mattoon, Ashmore, Lerna, Hutton, Fox Ridge State Park 
  and Coles County Airport.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3954 8837 3953 8805 3953 8800 3940 8803
      3940 8839

FLASH FLOOD...RADAR INDICATED

$$

37

1 follow-up statement

663 
WGUS73 KILX 040243
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
943 PM CDT Mon May 3 2021

ILC029-040253-
/O.CAN.KILX.FF.W.0001.000000T0000Z-210504T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coles IL-
943 PM CDT Mon May 3 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN COLES COUNTY...

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

LAT...LON 3954 8837 3953 8805 3953 8800 3940 8803
      3940 8839

$$

37

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:06 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Douglas, Macon, Moultrie, Shelby	54 min
May 3, 7:20 PM CDT	Tornado Warning	ILX	Moultrie	25 min
May 3, 7:33 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Shelby	42 min
May 3, 7:57 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Coles, Edgar	63 min
May 3, 8:02 PM CDT	Tornado Warning	ILX	Coles	28 min
May 3, 8:19 PM CDT	Severe Thunderstorm Warning	ILX	Coles, Cumberland, Moultrie, Shelby	41 min
May 3, 9:02 PM CDT	Special Weather Statement	ILX	Clark, Cumberland, Effingham, Jasper	43 min

Nearby

Flash Flood Warnings in Illinois, 2021 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.