Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 36, NWS Lincoln, IL

June 18, 2011Sangamon County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jun 18, 2011, 12:49 AM CDT for Sangamon County, 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
Jun 18, 2011, 12:49 AM CDT (05:49 UTC)
Expired
Jun 18, 2011, 5:00 AM CDT
In force
4 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

County Sangamon County, IL

The radar

The Lincoln radar (KILX), 67 km from the middle of the area, began a volume at 05:49 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 00:00Z, 5.8 hours before the alert went out and 119 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, Lincoln, IL at 00:00Z on 2011-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 601 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.19395878Sfc1 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
601 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
644 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

111 
WGUS53 KILX 180549
FFWILX
ILC167-181000-
/O.NEW.KILX.FF.W.0036.110618T0549Z-110618T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
1249 AM CDT SAT JUN 18 2011

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN SANGAMON COUNTY IN CENTRAL ILLINOIS...

* UNTIL 500 AM CDT

* AT 1247 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. RADAR RAINFALL ESTIMATES INDICATE 2 TO 4 INCHES OF 
  RAIN HAS FALLEN...AND ADDITIONAL HEAVY RAIN WILL BE LIKELY.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  AUBURN...LOAMI AND NEW BERLIN.

TWO FEET OF WATER WAS REPORTED OVER PORTIONS OF THE WAVERLY/NEW 
BERLIN BLACKTOP IN SOUTHWESTERN SANGAMON COUNTY EARLIER THIS EVENING.

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.

&&

LAT...LON 3979 8998 3979 8986 3979 8985 3953 8964
      3953 8975 3974 8998 3978 8999

$$
2 follow-up statements
412 
WGUS73 KILX 180918
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
418 AM CDT SAT JUN 18 2011

ILC167-181000-
/O.CON.KILX.FF.W.0036.000000T0000Z-110618T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANGAMON IL-
418 AM CDT SAT JUN 18 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHWESTERN SANGAMON
COUNTY UNTIL 500 AM CDT...

AT 416 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN 
AREA OF VERY HEAVY RAINFALL OCCURRED ACROSS THE WARNED AREA. 
ADDITIONAL HEAVY RAINFALL IS NOT LIKELY...BUT LOCALIZED FLOODING IS 
STILL POSSIBLE.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING 
INCLUDE...AUBURN...LOAMI AND NEW BERLIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3979 8998 3979 8986 3979 8985 3953 8964
      3953 8975 3974 8998 3978 8999

$$

AUTEN
432 
WGUS73 KILX 181000
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
500 AM CDT SAT JUN 18 2011

ILC167-181015-
/O.EXP.KILX.FF.W.0036.000000T0000Z-110618T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANGAMON IL-
500 AM CDT SAT JUN 18 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHWESTERN
SANGAMON COUNTY HAS BEEN ALLOWED TO EXPIRE...

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 3979 8998 3979 8986 3979 8985 3953 8964
      3953 8975 3974 8998 3978 8999

$$

AUTEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 9:33 PM CDTSpecial Weather StatementILXMorgan, Sangamon57 min
Jun 17, 10:01 PM CDTSevere Thunderstorm WarningILXMorgan, Sangamon44 min
Jun 17, 10:44 PM CDTFlash Flood WarningILXMorgan, Sangamon4 hr
Jun 17, 11:40 PM CDTSevere Thunderstorm WarningILXSangamon55 min
Jun 18, 12:26 AM CDTSevere Thunderstorm WarningILXSangamon37 min
Jun 18, 1:42 AM CDTFlash Flood WarningILXCass, Morgan3 hr
Jun 18, 2:27 AM CDTSevere Thunderstorm WarningILXEffingham, Jasper37 min
Jun 18, 2:32 AM CDTFlash Flood Warning EmergencyILXMorgan, Sangamon20 hr
Jun 18, 2:46 AM CDTFlash Flood WarningILXClay, Crawford, Cumberland, Effingham, Jasper, Lawrence and 2 more12 hr
Jun 18, 6:49 AM CDTSpecial Weather StatementILXMorgan56 min
Jun 18, 8:51 AM CDTRiver Flood WarningILXClay, Richland16 days
Jun 18, 2:16 PM CDTFlash Flood WatchILXChristian, Clay, Effingham, Jasper, Lawrence, Morgan and 4 more17 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.