Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 51, NWS St. Louis, MO

July 11, 2015Adams County, Brown County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 11, 2015, 7:08 PM CDT for Adams County, Brown County, Illinois. It was in force for 3 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 11, 2015, 7:08 PM CDT (00:08 UTC)
Expired: Jul 11, 2015, 10:00 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Adams County, IL, Brown County, IL

The radar

The Lincoln radar (KILX), 121 km from the middle of the area, began a volume at 00:09 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, 9:58 PM CDT	FLASH FLOOD	Coatsburg, IL	IL 24 CLOSED BETWEEN COATSBURG AND POLAMA... OVERPASS UNDERWATER
Jul 11, 10:00 PM CDT	FLASH FLOOD	Golden, IL	IL 94 CLOSED SOUTH OF GOLDEN... OVERPASS UNDER WATER
Jul 11, 10:01 PM CDT	FLASH FLOOD	Loraine, IL	UP TO A FOOT OF WATER OVER IL61 BETWEEN LORAINE AND GOLDEN.
Jul 11, 10:06 PM CDT	FLASH FLOOD	Mount Sterling, IL	10 RESIDENTS OF AN APARTMENT BUILDIING HAD TO BE EVACUATED DUE TO FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.1 hours before the alert went out and 179 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: 16 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 685 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

615 
WGUS53 KLSX 120008
FFWLSX
ILC001-009-120300-
/O.NEW.KLSX.FF.W.0051.150712T0008Z-150712T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS...
  BROWN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 1000 PM CDT
    
* AT 705 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED TO 
  BEGIN SHORTLY.  THUNDERSTORMS WITH HIGH RAINFALL RATES WILL 
  CONTINUE TO DEVELOP AND DROP SOUTHEASTWARD THROUGH THE AREA THIS 
  EVENING.  DOPPLER RADAR WAS ESTIMATING THAT 1 TO 2 INCHES OF RAIN 
  HAVE ALREADY FALLEN DURING THE PAST TWO HOURS ACROSS NORTHEASTERN 
  ADAMS AND BROWN COUNTIES. 
  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MOUNT STERLING...CAMP POINT...MENDON...CLAYTON...GOLDEN...
  BUCKHORN...LA GRANGE...VERSAILLES...LORAINE...WOODVILLE...LIMA...
  COATSBURG...MOUND STATION...COLUMBUS...RIPLEY...LA PRAIRIE...
  KELLERVILLE...CHATTON...PALOMA AND COOPERTOWN.

THIS WARNING ALSO INCLUDES SILOAM SPRINGS STATE PARK.
 
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 4019 9091 4011 9091 4010 9071 4008 9070
      4008 9067 4005 9067 4002 9063 4003 9061
      4001 9062 4000 9060 3998 9060 3998 9051
      3992 9054 3988 9058 3984 9058 3984 9090
      3996 9120 4020 9142

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Macoupin, Pike	40 min
Jul 11, 8:06 PM CDT	River Flood Warning	LSX	Brown	7 days
Jul 11, 8:15 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	45 min
Jul 11, 9:10 PM CDT	Special Weather Statement	LSX	Adams, Brown	50 min
Jul 11, 9:39 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Pike	39 min
Jul 11, 9:58 PM CDT	Flash Flood Warning	LSX	Adams, Brown	6 hr
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Adams	62 hr
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Adams	68 hr
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Pike	4 days
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Pike	4 days
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Pike	5 days
Jul 11, 10:50 PM CDT	River Flood Warning	LSX	Calhoun	5 days
Jul 11, 11:30 PM CDT	Special Weather Statement	LSX	Jersey	45 min
Jul 12, 2:20 AM CDT	Areal Flood Advisory	LSX	Pike	3 hr
Jul 12, 9:56 AM CDT	River Flood Warning	LSX	Adams	60 hr

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.