Alert archive / Illinois / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Paducah, KY

August 5, 2012Jackson County, Williamson County, Illinois

NWS Paducah, KY issued this flash flood warning at Aug 5, 2012, 1:09 AM CDT for Jackson County, Williamson County, Illinois. It was in force for 75 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 5, 2012, 1:09 AM CDT (06:09 UTC)
Expired
Aug 5, 2012, 2:24 AM CDT
In force
75 min
Issued by
NWS Paducah, KY
Area
Storm-based polygon
Flood severity
None

Counties Jackson County, IL, Williamson County, IL

The radar

The Paducah radar (KPAH), 85 km from the middle of the area, began a volume at 06:11 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, 6.2 hours before the alert went out and 271 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 2012-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 857 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 00:00Z on 2012-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
857 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
1700 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

632 
WGUS53 KPAH 050609
FFWPAH
ILC077-199-050900-
/O.NEW.KPAH.FF.W.0013.120805T0609Z-120805T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PADUCAH KY
109 AM CDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN PADUCAH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JACKSON COUNTY IN SOUTHERN ILLINOIS...
  WILLIAMSON COUNTY IN SOUTHERN ILLINOIS...

* UNTIL 400 AM CDT.

* AT 102 AM CDT...THE PUBLIC REPORTED SOME ROADS BEGINNING TO FLOOD  
  WITHIN THE WARNED AREA...ESPECIALLY IN MURPHYSBORO AND            
  CARBONDALE. DOPPLER RADAR AND SURFACE REPORTS INDICATE OVER       
  2 INCHES OF RAIN HAS FALLEN IN THE PAST HOUR OR SO...AND AND       
  ANOTHER QUICK INCH OR TWO SO IS LIKELY TO FALL WITHIN THE NEXT     
  HOUR AS THUNDERSTORMS WITH TORRENTIAL RAIN TRAIN OVER THE SAME     
  LOCATIONS.  

* LOCATIONS IN THE WARNED AREA INCLUDE...
  MURPHYSBORO...CARTERVILLE...HERRIN...JOHNSTON CITY...DE SOTO...
  CAMBRIA...HURST...ENERGY AND PITTSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 3786 8953 3786 8872 3760 8874 3760 8946

$$
1 follow-up statement
175 
WGUS73 KPAH 050724
FFSPAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PADUCAH KY
224 AM CDT SUN AUG 5 2012

ILC077-199-050733-
/O.CAN.KPAH.FF.W.0013.000000T0000Z-120805T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JACKSON IL-WILLIAMSON IL-
224 AM CDT SUN AUG 5 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WILLIAMSON AND
SOUTHERN JACKSON COUNTIES IN SOUTHERN ILLINOIS...

MOST OF THE HEAVY RAINS HAVE NOW MOVED OUT OF THE WARNED AREA AND  
NO REPORTS OF SIGNIFICANT FLOODING HAVE BEEN RECEIVED AT THIS TIME.

LAT...LON 3786 8953 3786 8872 3760 8874 3760 8946

$$

Nearby

Flash Flood Warnings in Illinois, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.