Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 15, NWS St. Louis, MO

July 20, 2016Macoupin County, Madison County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 20, 2016, 7:39 AM CDT for Macoupin County, Madison County, Illinois. It was in force for 4 hr. 4 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: Jul 20, 2016, 7:39 AM CDT (12:39 UTC)
Expired: Jul 20, 2016, 11:45 AM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Macoupin County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 59 km from the middle of the area, began a volume at 12:42 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 20, 8:25 AM CDT	HEAVY RAIN 3.01	1 S Medora, IL
Jul 20, 8:56 AM CDT	FLOOD	Bethalto, IL	1 TO 2 FEET OF WATER COVERING INTERSECTION OF IL HWY 140 AT PRAIRIE ST
Jul 20, 10:00 AM CDT	FLASH FLOOD	1 Ne Brighton, IL	PIASA ROAD JUST NORTHEAST OF TOWN WAS BRIEFLY CLOSED DUE TO FLASH FLOODING.
Jul 20, 10:03 AM CDT	FLOOD	1 Ne Bethalto, IL	UPWARDS OF 6 INCHES OF RAIN IN MORO IL. NEIGHBORHOOD STREETS FLOODED.

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, 0.7 hours before the alert went out and 186 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: 3 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1429 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

925 
WGUS53 KLSX 201239
FFWLSX
ILC117-119-201645-
/O.NEW.KLSX.FF.W.0015.160720T1239Z-160720T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
739 AM CDT WED JUL 20 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS...
  WESTERN MADISON COUNTY IN SOUTHWESTERN ILLINOIS...

* UNTIL 1145 AM CDT

* AT 738 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. THREE TO FOUR INCHES OF RAIN
  HAS ALREADY FALLEN. FLASH FLOODING IS EXPECTED ACROSS THE WARNING
  AREA.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GRANITE CITY...ALTON...EDWARDSVILLE...GODFREY...GLEN CARBON...
  WOOD RIVER...BETHALTO...PONTOON BEACH...EAST ALTON...BRIGHTON...
  SOUTH ROXANA...BUNKER HILL...ROXANA...HARTFORD...SHIPMAN...
  WEST ALTON...DORSEY...PRAIRIETOWN...ROSEWOOD HEIGHTS AND CARPENTER.

THIS INCLUDES INTERSTATE 55 IN ILLINOIS NEAR EXIT 23.
 
THIS ALSO INCLUDES  BEAVER DAM STATE PARK.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 3876 8984 3880 8996 3873 8999 3878 9015
      3881 9012 3885 9011 3893 9028 3900 9027
      3900 9015 3935 9015 3929 8999

$$

CARNEY

1 follow-up statement

100 
WGUS73 KLSX 201642
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1142 AM CDT WED JUL 20 2016

ILC117-119-201652-
/O.EXP.KLSX.FF.W.0015.000000T0000Z-160720T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MACOUPIN IL-MADISON IL-
1142 AM CDT WED JUL 20 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MACOUPIN AND WESTERN
MADISON COUNTIES IN SOUTHWESTERN ILLINOIS WILL EXPIRE AT 1145 AM
CDT...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3876 8984 3880 8996 3873 8999 3878 9015
      3881 9012 3885 9011 3893 9028 3900 9027
      3900 9015 3935 9015 3929 8999

$$

GOSSELIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:31 PM CDT	Special Weather Statement	LSX	Calhoun, Jersey, Macoupin	44 min
Jul 19, 7:47 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	43 min
Jul 19, 8:26 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	49 min
Jul 19, 9:07 PM CDT	Special Weather Statement	LSX	Monroe, Saint Clair	38 min
Jul 20, 5:50 AM CDT	Areal Flood Advisory	LSX	Jersey, Macoupin, Madison, Saint Clair	4 hr
Jul 20, 5:55 AM CDT	Areal Flood Advisory	LSX	Brown, Pike	4 hr
Jul 20, 6:43 AM CDT	Flash Flood Warning	LSX	Madison, Saint Clair	4 hr
Jul 20, 7:09 AM CDT	Flash Flood Warning	LSX	Greene, Jersey	4 hr
Jul 20, 10:50 AM CDT	Areal Flood Warning	LSX	Greene, Jersey, Macoupin, Madison, Saint Clair	6 hr

Nearby

Flash Flood Warnings in Illinois, 2016 Every flash flood warning in 2016

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.