Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 75, NWS St. Louis, MO

July 12, 2011Marion County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 12, 2011, 4:06 PM CDT for Marion County, Illinois. It was in force for 3 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, 4:06 PM CDT (21:06 UTC)
Expired: Jul 12, 2011, 7:00 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Marion County, IL

The radar

The Evansville,IN radar (KVWX), 101 km from the middle of the area, began a volume at 21:05 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, 4:35 PM CDT	FLASH FLOOD	2 Ssw Cartter, IL	COUPLE INCHES OF WATER OVER STATE ROUTE 37 NEAR WALNUT HILL ROAD.

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, 9.1 hours before the alert went out and 184 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.

625 
WGUS53 KLSX 122106
FFWLSX
ILC121-130000-
/O.NEW.KLSX.FF.W.0075.110712T2106Z-110713T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
406 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 407 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. 

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3847 8870 3847 8914 3852 8915 3864 8869
      3847 8869

$$

CVKING

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 2:25 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	26 min
Jul 12, 2:31 PM CDT	Flash Flood Warning	LSX	Madison, Saint Clair	3 hr
Jul 12, 3:20 PM CDT	Areal Flood Advisory	LSX	Adams	102 min
Jul 12, 3:23 PM CDT	Areal Flood Advisory	LSX	Marion, Washington	3 hr
Jul 12, 3:38 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	52 min
Jul 12, 3:44 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	46 min
Jul 12, 4:18 PM CDT	Severe Thunderstorm Warning	LSX	Marion	27 min
Jul 12, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Calhoun, Greene, Jersey, Pike	44 min
Jul 12, 4:44 PM CDT	Tornado Warning	LSX	Greene, Macoupin, Pike	46 min
Jul 12, 4:48 PM CDT	Severe Thunderstorm Warning	LSX	Marion	42 min
Jul 12, 5:03 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey, Macoupin, Madison, Montgomery and 1 more	57 min
Jul 12, 5:10 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	30 min
Jul 12, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Marion	39 min
Jul 12, 6:53 PM CDT	Areal Flood Warning	LSX	Marion	4 hr

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.