Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 64, NWS Lincoln, IL

July 12, 2011Clay County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jul 12, 2011, 4:21 PM CDT for Clay County, 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: Jul 12, 2011, 4:21 PM CDT (21:21 UTC)
Expired: Jul 12, 2011, 10:30 PM CDT
In force: 6 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

County Clay County, IL

The radar

The Evansville,IN radar (KVWX), 76 km from the middle of the area, began a volume at 21:25 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
Jul 12, 4:25 PM CDT	FLASH FLOOD	S Xenia, IL	SEVERAL INCHES OF FLOWING WATER OVER FAIRFIELD ROAD. 1/4 MILE SOUTH OF XENIA.

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, 9.4 hours before the alert went out and 163 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: 1615 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

898 
WGUS53 KILX 122121
FFWILX
ILC025-130330-
/O.NEW.KILX.FF.W.0064.110712T2121Z-110713T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
421 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN CLAY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1030 PM CDT

* AT 420 PM CDT...EMERGENCY MANAGEMENT REPORTED FLASH FLOODING ACROSS
  FAIRFIELD ROAD IN SEVERAL PLACES JUST SOUTH OF XENIA. DOPPLAR 
  RADAR ESTIMATES THAT OVER 2 INCHES OF RAIN HAS FALLEN IN THAT LAST 
  HOUR. ADDITIONAL RAINFALL UP TO ONE INCH WILL BE POSSIBLE THROUGH  
  6 PM.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...FLORA...CLAY
  CITY... AND XENIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 3879 8870 3880 8869 3875 8826 3873 8826
      3873 8828 3872 8829 3866 8828 3863 8829
      3862 8829 3861 8826 3860 8826 3860 8870

$$

1 follow-up statement

428 
WGUS73 KILX 130320
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1020 PM CDT TUE JUL 12 2011

ILC025-130335-
/O.EXP.KILX.FF.W.0064.000000T0000Z-110713T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAY IL-
1020 PM CDT TUE JUL 12 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN CLAY
COUNTY WILL BE ALLOWED TO EXPIRE AT 1030 PM CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3879 8870 3880 8869 3875 8826 3873 8826
      3873 8828 3872 8829 3866 8828 3863 8829
      3862 8829 3861 8826 3860 8826 3860 8870

$$

SHIMON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:42 PM CDT	Special Weather Statement	ILX	Clay	63 min
Jul 12, 3:56 PM CDT	Special Weather Statement	ILX	Sangamon	64 min
Jul 12, 4:46 PM CDT	Severe Thunderstorm Warning	ILX	Scott	44 min
Jul 12, 5:39 PM CDT	Severe Thunderstorm Warning	ILX	Lawrence	51 min
Jul 12, 5:45 PM CDT	Flash Flood Warning	ILX	Lawrence, Richland	5 hr
Jul 12, 6:28 PM CDT	Flash Flood Warning	ILX	Crawford, Jasper	5 hr
Jul 12, 6:37 PM CDT	Severe Thunderstorm Warning	ILX	Crawford, Lawrence	38 min

Nearby

Flash Flood Warnings in Illinois, 2011 Every flash flood warning in 2011

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.