Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Lincoln, IL

July 16, 20216 counties in Illinois

NWS Lincoln, IL issued this flash flood warning at Jul 16, 2021, 5:47 PM CDT for 6 counties in Illinois. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 16, 2021, 5:47 PM CDT (22:47 UTC)
Expired: Jul 16, 2021, 9:45 PM CDT
In force: 4 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

Counties Clay County, IL, Crawford County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 78 km from the middle of the area, began a volume at 22:48 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 12:00Z, 10.8 hours before the alert went out and 147 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: 139 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

730 
WGUS53 KILX 162247
FFWILX
ILC025-033-049-079-101-159-170245-
/O.NEW.KILX.FF.W.0024.210716T2247Z-210717T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
547 PM CDT Fri Jul 16 2021

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Crawford County in east central Illinois...
  Clay County in south central Illinois...
  Southeastern Effingham County in south central Illinois...
  Southern Jasper County in southeastern Illinois...
  Northwestern Lawrence County in southeastern Illinois...
  Northwestern Richland County in southeastern Illinois...

* Until 945 PM CDT.

* At 542 PM CDT, emergency management reported thunderstorms 
  producing heavy rain across the warned area. Between 2 and 4 
  inches of rain have fallen. Flash flooding is already occurring 
  across Crawford County, with several roads closed due to creeks 
  flooding nearby roadways.

  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...
  Olney, Robinson, Flora, Newton, Oblong, Palestine, Louisville, 
  Clay City, Noble, Hutsonville, Xenia, Bible Grove, Ste. Marie, 
  Willow Hill, Iola, Sailor Springs, West Liberty, Dundas, Bogota 
  and Ingraham.

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.

Please report flooding to your local law enforcement agency when you 
can do so safely.

&&

LAT...LON 3883 8869 3899 8825 3906 8790 3915 8765
      3911 8763 3911 8765 3910 8762 3909 8762
      3906 8757 3900 8758 3899 8756 3899 8757
      3899 8758 3897 8755 3892 8766 3885 8790
      3881 8794 3861 8824 3861 8870

FLASH FLOOD...OBSERVED

$$

Shimon

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 7:35 PM CDT	Flash Flood Warning	ILX	Coles	4 hr
Jul 16, 7:04 AM CDT	Flash Flood Warning	ILX	McLean	4 hr
Jul 16, 7:16 AM CDT	River Flood Warning	ILX	Fulton, Knox	10 hr
Jul 16, 9:40 AM CDT	River Flood Warning	ILX	Crawford, Jasper	23 hr
Jul 16, 9:41 AM CDT	Flash Flood Warning	ILX	McLean	4 hr
Jul 16, 9:43 AM CDT	River Flood Warning	ILX	Lawrence	5 days
Jul 16, 11:37 AM CDT	Areal Flood Advisory	ILX	Cass, Fulton, Mason, Menard, Schuyler, Tazewell	3 hr
Jul 16, 1:35 PM CDT	Areal Flood Warning	ILX	DeWitt, Logan, McLean	24 hr

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.