Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 26, NWS Lincoln, IL

May 29, 2011Knox County, Illinois

NWS Lincoln, IL issued this flash flood warning at May 29, 2011, 10:19 AM CDT for Knox 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 29, 2011, 10:19 AM CDT (15:19 UTC)
Expired
May 29, 2011, 4:30 PM CDT
In force
6 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

County Knox County, IL

The radar

The Quad Cities radar (KDVN), 60 km from the middle of the area, began a volume at 15:19 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

TimeReportWhereRemark
May 29, 11:00 AM CDTFLASH FLOOD1 N Rio, ILPOLK CREEK IS OUT OF BANK AND IS NEARING SPILLING OVER ONTO US HWY 150.
May 29, 11:17 AM CDTFLASH FLOOD1 Nne Rio, ILLAND SLIDE BLOCKING ONE LANE OF TRAFFIC ALONG US HWY 150 JUST NORTH OF POLK CREEK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 3.3 hours before the alert went out and 59 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2011-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2011-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
995 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

008 
WGUS53 KILX 291519
FFWILX
ILC095-292130-
/O.NEW.KILX.FF.W.0026.110529T1519Z-110529T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1019 AM CDT SUN MAY 29 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN KNOX COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 430 PM CDT SUNDAY

* AT 1017 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL APPROACHING 
  THE WARNED AREA. RADAR INDICATES BETWEEN TWO AND THREE INCHES
  OF RAIN HAS ALREADY FALLEN THIS MORNING IN NORTHWEST KNOX COUNTY.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...RIO.


THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
POPE CREEK...WALNUT CREEK...HENDERSON CREEK...MUD RUN...NORTH
HENDERSON CREEK AND PENNINGTON CREEK.

LAT...LON 4115 9011 4103 9042 4116 9043

$$

BARKER
2 follow-up statements
307 
WGUS73 KILX 291640
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1140 AM CDT SUN MAY 29 2011

ILC095-292130-
/O.CON.KILX.FF.W.0026.000000T0000Z-110529T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KNOX IL-
1140 AM CDT SUN MAY 29 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWESTERN KNOX COUNTY
UNTIL 430 PM CDT...

AT 1139 AM CDT...WEATHER SPOTTERS REPORTED THAT FLASH FLOODING WAS
OCCURRING IN NORTHWEST KNOX COUNTY.  U.S. 150 WAS CLOSED AT POPE CREEK
DUE TO FLOODING.

SOME LOCATIONS THAT WILL CONTINUE TO EXPERIENCE FLASH FLOODING
INCLUDE...RIO.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
POPE CREEK...WALNUT CREEK...HENDERSON CREEK...NORTH HENDERSON CREEK
AND PENNINGTON CREEK.

LAT...LON 4115 9011 4103 9042 4116 9043

$$

BARKER
723 
WGUS73 KILX 292122
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
422 PM CDT SUN MAY 29 2011

ILC095-292138-
/O.EXP.KILX.FF.W.0026.000000T0000Z-110529T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KNOX IL-
422 PM CDT SUN MAY 29 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHWESTERN KNOX
COUNTY WILL BE ALLOWED TO EXPIRE AT 430 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 4115 9011 4103 9042 4116 9043

$$

BAK

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 8:47 AM CDTSevere Thunderstorm WarningILXKnox28 min
May 29, 10:14 AM CDTSevere Thunderstorm WarningILXKnox, Stark61 min
May 29, 10:42 AM CDTSevere Thunderstorm WarningILXFulton, Knox, Peoria, Stark, Tazewell33 min
May 29, 11:08 AM CDTSevere Thunderstorm WarningILXFulton, Knox, Marshall, Peoria, Stark, Tazewell and 1 more52 min
May 29, 12:01 PM CDTSpecial Weather StatementILXMarshall, Tazewell, Woodford59 min

Nearby

Flash Flood Warnings in Illinois, 2011Every 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.