Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 50, NWS St. Louis, MO

July 11, 2015Greene County, Macoupin County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 11, 2015, 5:11 PM CDT for Greene County, Macoupin County, Illinois. It was in force for 6 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 11, 2015, 5:11 PM CDT (22:11 UTC)
Expired: Jul 11, 2015, 11:00 PM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Greene County, IL, Macoupin County, IL

The radar

The St Louis radar (KLSX), 91 km from the middle of the area, began a volume at 22:14 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 11, 9:12 PM CDT	HEAVY RAIN 4.5	3 E Scottville, IL	4.5 INCHES OF RAIN SO FAR TODAY.

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, 10.2 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 935 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

544 
WGUS53 KLSX 112211
FFWLSX
ILC061-117-120400-
/O.NEW.KLSX.FF.W.0050.150711T2211Z-150712T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
511 PM CDT SAT JUL 11 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN GREENE COUNTY IN SOUTHWESTERN ILLINOIS...
  NORTHERN MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS...

* UNTIL 1100 PM CDT
    
* AT 507 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED TO 
  BEGIN SHORTLY. ADDITIONAL THUNDERSTORMS WITH HIGH RAINFALL RATES 
  CAN BE EXPECTED TO CONTINUE TO MOVE ACROSS THIS AREA THIS EVENING. 
  THE DOPPLER RADAR WAS ALREADY ESTIMATING RAINFALL AMOUNTS OF 1 TO 
  2 INCHES ACROSS THE NORTHERN PORTIONS OF GREENE AND MACOUPIN 
  COUNTIES DURING THE LAST TWO HOURS. 
    
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CARLINVILLE...VIRDEN...WHITE HALL...GIRARD...ROODHOUSE...
  GREENFIELD...PALMYRA...ATHENSVILLE...PATTERSON...WRIGHTS...
  NILWOOD...MODESTO...CHESTERFIELD...HETTICK...STANDARD CITY...
  SCOTTVILLE...WALKERSVILLE...BERDAN...HORNSBY AND BARROW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3913 8971 3939 9051 3952 9053 3952 8971

$$

GKS

1 follow-up statement

171 
WGUS73 KLSX 120403
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1103 PM CDT SAT JUL 11 2015

ILC061-117-120411-
/O.EXP.KLSX.FF.W.0050.000000T0000Z-150712T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GREENE IL-MACOUPIN IL-
1103 PM CDT SAT JUL 11 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN GREENE AND NORTHERN
MACOUPIN COUNTIES HAS EXPIRED...

FLOOD WATERS WERE RECEDING...AND IT APPEARS THAT THEY NO LONGER  
POSE A THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD 
CLOSURES.

LAT...LON 3913 8971 3939 9051 3952 9053 3952 8971

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 12:47 PM CDT	Special Weather Statement	LSX	Adams, Brown	43 min
Jul 11, 1:07 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	38 min
Jul 11, 2:08 PM CDT	Special Weather Statement	LSX	Brown	52 min
Jul 11, 2:14 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	28 min
Jul 11, 3:19 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	41 min
Jul 11, 3:30 PM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	3 days
Jul 11, 3:56 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	49 min
Jul 11, 4:31 PM CDT	Areal Flood Advisory	LSX	Greene, Macoupin	4 hr
Jul 11, 4:53 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	67 min
Jul 11, 5:37 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	38 min
Jul 11, 5:52 PM CDT	Tornado Warning	LSX	Greene	23 min
Jul 11, 6:20 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	40 min
Jul 11, 6:39 PM CDT	Severe Thunderstorm Warning	LSX	Brown	18 min

Nearby

Flash Flood Warnings in Illinois, 2015 Every flash flood warning in 2015

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.