Alert archive / Illinois / Flash Flood Warnings in 2017

Flash Flood Warning 31, NWS Lincoln, IL

November 18, 20175 counties in Illinois

NWS Lincoln, IL issued this flash flood warning at Nov 18, 2017, 8:59 AM CST for 5 counties in Illinois. It was in force for 6 hr. 1 report 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: Nov 18, 2017, 8:59 AM CST (14:59 UTC)
Expired: Nov 18, 2017, 3:00 PM CST
In force: 6 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

Counties Champaign County, IL, DeWitt County, IL, McLean County, IL, Piatt County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 94 km from the middle of the area, began a volume at 15:00 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

Time	Report	Where	Remark
Nov 18, 9:18 AM CST	HEAVY RAIN 2.16	Hoopeston, IL	STORM TOTAL SO FAR. 0.76 INCHES FELL IN 15 MINUTES.

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, 3.0 hours before the alert went out and 37 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

551 
WGUS53 KILX 181459
FFWILX
ILC019-039-113-147-183-182100-
/O.NEW.KILX.FF.W.0031.171118T1459Z-171118T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
859 AM CST SAT NOV 18 2017

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Northern Piatt County in central Illinois...
  Central De Witt County in central Illinois...
  Northern Vermilion County in east central Illinois...
  Southeastern McLean County in central Illinois...
  Northern Champaign County in east central Illinois...

* Until 300 PM CST Saturday

* At 858 AM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two to three inches of 
  rain have already fallen, and additional storms with heavy rain 
  are expected in the next hour or two. Flash flooding is expected 
  to begin shortly.

* Some locations that will experience flooding include...
  Rantoul, Clinton, Mahomet, Hoopeston, Farmer City, Fisher,
  Rossville, Thomasboro, Colfax, Gifford, Mansfield, Potomac,
  Saybrook, Rankin, Wapella, Lake Of The Woods, Bismarck, Ludlow,
  Bellflower and Royal.

This includes the following highways...
 Interstate 57 between mile markers 240 and 257.
 Interstate 74 between mile markers 157 and 177.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4022 8753 4010 8914 4023 8914 4027 8859
      4061 8866 4061 8846 4040 8846 4040 8794
      4049 8793 4049 8753

$$

Shimon

1 follow-up statement

879 
WGUS73 KILX 181923 RRB
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
123 PM CST SAT NOV 18 2017

ILC019-039-113-147-183-181933-
/O.CAN.KILX.FF.W.0031.000000T0000Z-171118T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Piatt-De Witt-Vermilion-McLean-Champaign-
123 PM CST SAT NOV 18 2017

...THE FLASH FLOOD WARNING FOR NORTHERN PIATT...CENTRAL DE WITT...
NORTHERN VERMILION...SOUTHEASTERN MCLEAN AND NORTHERN CHAMPAIGN
COUNTIES IS CANCELLED...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4022 8753 4010 8914 4023 8914 4027 8859
      4061 8866 4061 8846 4040 8846 4040 8794
      4049 8793 4049 8753

$$

Shimon

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 18, 6:43 AM CST	Special Weather Statement	ILX	Mason, Tazewell	47 min
Nov 18, 7:20 AM CST	Special Weather Statement	ILX	McLean	40 min
Nov 18, 8:20 AM CST	Flash Flood Warning	ILX	DeWitt, Logan, McLean	6 hr
Nov 18, 8:52 AM CST	Flash Flood Warning	ILX	Logan, McLean, Mason, Menard, Tazewell	6 hr
Nov 18, 10:10 AM CST	Special Weather Statement	ILX	Coles, Douglas, Edgar, Moultrie, Shelby, Vermilion	65 min
Nov 18, 11:18 AM CST	Special Weather Statement	ILX	Clark, Crawford, Cumberland, Effingham, Jasper	57 min
Nov 18, 12:07 PM CST	Special Weather Statement	ILX	Clay, Crawford, Jasper, Richland	53 min

Nearby

Flash Flood Warnings in Illinois, 2017 Every flash flood warning in 2017

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.