Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 48, NWS St. Louis, MO

September 9, 2016Clinton County, Washington County, Illinois

NWS St. Louis, MO issued this flash flood warning at Sep 9, 2016, 8:10 PM CDT for Clinton County, Washington County, Illinois. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 9, 2016, 8:10 PM CDT (01:10 UTC)
Expired
Sep 10, 2016, 12:15 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Clinton County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 109 km from the middle of the area, began a volume at 01:10 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.2 hours before the alert went out and 205 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2016-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 237 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2016-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
237 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

446 
WGUS53 KLSX 100110
FFWLSX
ILC027-189-100515-
/O.NEW.KLSX.FF.W.0048.160910T0110Z-160910T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
810 PM CDT FRI SEP 9 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1215 AM CDT.

* AT 809 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. BETWEEN TWO AND THREE INCHES OF
  RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEW BADEN...NASHVILLE...CENTRALIA...OKAWVILLE...GERMANTOWN...
  ALBERS...WAMAC...IRVINGTON...NEW MEMPHIS...SHATTUC...BARTELSO...
  BEAUCOUP...HOYLETON...JOHANNISBURG...HOFFMAN...DAMIANSVILLE...
  COVINGTON...RICHVIEW...ADDIEVILLE AND NEW MINDEN.

THIS INCLUDES INTERSTATE 64 IN ILLINOIS BETWEEN EXITS 34 AND 61.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3832 8970 3855 8970 3862 8914 3835 8915

$$

TILLY
1 follow-up statement
110 
WGUS73 KLSX 100509
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1209 AM CDT SAT SEP 10 2016

ILC027-189-100519-
/O.EXP.KLSX.FF.W.0048.000000T0000Z-160910T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON IL-CLINTON IL-
1209 AM CDT SAT SEP 10 2016

...THE FLASH FLOOD WARNING FOR NORTHERN WASHINGTON AND SOUTHERN
CLINTON COUNTIES WILL EXPIRE AT 1215 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 3832 8970 3855 8970 3862 8914 3835 8915

$$

TES

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 4:19 AM CDTFlash Flood WarningLSXMadison, Monroe, Saint Clair6 hr

Nearby

Flash Flood Warnings in Illinois, 2016Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.