Alert archive / Illinois / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Lincoln, IL

May 4, 2012Marshall County, Illinois

NWS Lincoln, IL issued this flash flood warning at May 4, 2012, 2:29 AM CDT for Marshall County, Illinois. It was in force for 6 hr. 2 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: May 4, 2012, 2:29 AM CDT (07:29 UTC)
Expired: May 4, 2012, 8:30 AM CDT
In force: 6 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

County Marshall County, IL

The radar

The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 07:30 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
May 4, 6:00 AM CDT	HEAVY RAIN 2.89	Sparland, IL	24-HOUR TOTAL.
May 4, 8:30 AM CDT	HEAVY RAIN 2.13	Henry, IL	OVERNIGHT TOTAL.

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 00:00Z, 7.5 hours before the alert went out and 117 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: 1905 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 96 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.

436 
WGUS53 KILX 040729
FFWILX
ILC123-041330-
/O.NEW.KILX.FF.W.0002.120504T0729Z-120504T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
229 AM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN MARSHALL COUNTY IN CENTRAL ILLINOIS...

* UNTIL 830 AM CDT

* AT 227 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING ACROSS THE WARNED AREA. PORTIONS OF SEVERAL ROADWAYS IN 
EAST CENTRAL MARSHALL COUNTY ARE CLOSED DUE TO HEAVY RAINS OF 4 TO 6 
INCHES THURSDAY EVENING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...LACON...
  HENRY...TOLUCA...VARNA AND WENONA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

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 4112 8932 4111 8933 4111 8905 4110 8904
      4093 8905 4093 8945 4114 8943 4115 8933

$$

CHS

1 follow-up statement

712 
WGUS73 KILX 041323
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
823 AM CDT FRI MAY 4 2012

ILC123-041339-
/O.EXP.KILX.FF.W.0002.000000T0000Z-120504T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARSHALL IL-
823 AM CDT FRI MAY 4 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN MARSHALL
COUNTY WILL BE ALLOWED TO EXPIRE AT 830 AM 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 4112 8932 4111 8933 4111 8905 4110 8904
      4093 8905 4093 8945 4114 8943 4115 8933

$$

BARNES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:26 PM CDT	Special Weather Statement	ILX	Marshall	64 min
May 3, 7:36 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	54 min
May 3, 8:24 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	51 min
May 3, 8:39 PM CDT	Flash Flood Warning	ILX	Marshall	6 hr
May 3, 11:16 PM CDT	Severe Thunderstorm Warning	ILX	Knox	44 min
May 3, 11:29 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Peoria, Stark	61 min
May 4, 12:07 AM CDT	Severe Thunderstorm Warning	ILX	Peoria, Tazewell, Woodford	53 min
May 4, 12:29 AM CDT	Severe Thunderstorm Warning	ILX	Marshall, Peoria	46 min
May 4, 12:52 AM CDT	Severe Thunderstorm Warning	ILX	McLean, Woodford	35 min
May 4, 8:47 AM CDT	Severe Thunderstorm Warning	ILX	Clay, Jasper, Richland	43 min
May 4, 1:22 PM CDT	Severe Thunderstorm Warning	ILX	Lawrence	38 min

Nearby

Flash Flood Warnings in Illinois, 2012 Every flash flood warning in 2012

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.