Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 39, NWS St. Louis, MO

June 15, 20104 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at Jun 15, 2010, 2:31 PM CDT for 4 counties in 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: Jun 15, 2010, 2:31 PM CDT (19:31 UTC)
Expired: Jun 15, 2010, 8:30 PM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Bond County, IL, Clinton County, IL, Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 19:34 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
Jun 15, 2:48 PM CDT	HEAVY RAIN 1.5	Glen Carbon, IL	RAIN FELL IN UNDER 30 MINUTES WITH WATER COVERING MANY OF THE ROADS
Jun 15, 3:20 PM CDT	HEAVY RAIN 1.75	St. Jacob, IL	RAIN FELL IN 45 MINUTES

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, 7.5 hours before the alert went out and 187 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: 630 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 482 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 60 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.

059 
WGUS53 KLSX 151931
FFWLSX
ILC005-027-119-163-160130-
/O.NEW.KLSX.FF.W.0039.100615T1931Z-100616T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
231 PM CDT TUE JUN 15 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 830 PM CDT

* AT 229 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. RAINFALL AMOUNTS OF AROUND 1.50 INCHES HAVE ALREADY 
  FALLEN ACROSS PORTIONS OF THE WARNED AREA. THUNDERSTORMS PRODUCING 
  ANOTHER 1 TO 2 INCHES OF RAIN ARE EXPECTED TO MOVE OVER THESE SAME 
  AREAS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ALTON...BELLEVILLE...BETHALTO...BREESE...CAHOKIA...CASEYVILLE...
  CENTREVILLE...COLLINSVILLE...DUPO...EAST ST. LOUIS...
  EDWARDSVILLE...FAIRVIEW HEIGHTS...GLEN CARBON...GODFREY...GRANITE
  CITY...GREENVILLE...HIGHLAND...LEBANON...MADISON...MARYVILLE...
  O'FALLON...PONTOON BEACH...SCOTT AFB...SHILOH...SWANSEA...TROY...
  VENICE...WASHINGTON PARK...WOOD RIVER AND ALHAMBRA.

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.

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 3864 8926 3848 9021 3854 9026 3861 9018
      3870 9020 3883 9011 3892 9027 3900 9028
      3900 8959 3903 8959 3903 8926

$$

TILLY

1 follow-up statement

872 
WGUS73 KLSX 160129
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
829 PM CDT TUE JUN 15 2010

ILC005-027-119-163-160144-
/O.EXP.KLSX.FF.W.0039.000000T0000Z-100616T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. CLAIR IL-CLINTON IL-MADISON IL-BOND IL-
829 PM CDT TUE JUN 15 2010

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR BOND...MADISON...
NORTHERN CLINTON AND NORTHERN ST. CLAIR COUNTIES WILL BE ALLOWED TO
EXPIRE AT 830 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 3864 8926 3848 9021 3854 9026 3861 9018
      3870 9020 3883 9011 3892 9027 3900 9028
      3900 8959 3903 8959 3903 8926

$$

BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 1:00 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Saint Clair	45 min
Jun 15, 1:33 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison	42 min
Jun 15, 1:49 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette	41 min
Jun 15, 1:53 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion	52 min
Jun 15, 2:12 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	48 min
Jun 15, 2:14 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Madison, Montgomery	46 min
Jun 15, 2:19 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	41 min
Jun 15, 2:27 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	33 min
Jun 15, 2:30 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair, Washington	45 min
Jun 15, 2:36 PM CDT	Tornado Warning	LSX	Bond, Fayette, Montgomery	23 min
Jun 15, 2:40 PM CDT	Tornado Warning	LSX	Bond, Clinton, Madison, Saint Clair	50 min
Jun 15, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	Washington	34 min
Jun 15, 2:48 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	27 min
Jun 15, 3:06 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion	39 min
Jun 15, 3:12 PM CDT	Flash Flood Warning	LSX	Clinton, Fayette, Marion	6 hr
Jun 15, 3:15 PM CDT	Severe Thunderstorm Warning	LSX	Washington	15 min

Nearby

Flash Flood Warnings in Illinois, 2010 Every flash flood warning in 2010

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.