Alert archive / Illinois / Flash Flood Warnings in 2018

Flash Flood Warning 11, NWS St. Louis, MO

June 11, 20184 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at Jun 11, 2018, 8:01 PM CDT for 4 counties in 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: Jun 11, 2018, 8:01 PM CDT (01:01 UTC)
Expired: Jun 12, 2018, 2:00 AM 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, Fayette County, IL, Marion County, IL

The radar

The Evansville,IN radar (KVWX), 127 km from the middle of the area, began a volume at 01:02 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 11, 8:15 PM CDT	FLASH FLOOD	3 S Patoka, IL	HIGHWAY 51 CLOSED DUE TO WATER OVER THE ROAD. TIME OF CLOSURE ESTIMATED.

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 00:00Z, 1.0 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: 431 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

551 
WGUS53 KLSX 120101
FFWLSX
ILC005-027-051-121-120700-
/O.NEW.KLSX.FF.W.0011.180612T0101Z-180612T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
801 PM CDT MON JUN 11 2018

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Northeastern Clinton County in south central Illinois...
  Southeastern Bond County in south central Illinois...
  Northern Marion County in south central Illinois...
  Southern Fayette County in south central Illinois...

* Until 200 AM CDT.

* At 801 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Salem, Vandalia, St. Elmo, Kinmundy, Brownstown, Mulberry Grove,
  Patoka, Tamalco, Farina, Omega, Stephen Forbes Station, Shobonier,
  Fairman, Boulder, Pleasant Mound, Tonti, La Clede, Pittsburg, Iuka
  and Keyesport.

This includes the following highways...
 Interstate 70 in Illinois near exit 52, and between exits 68 and 76.
 Interstate 57 in Illinois between exits 127 and 135.

This also includes Carlyle Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3868 8933 3891 8933 3903 8881 3891 8881
      3891 8869 3860 8870

$$

Tilly

2 follow-up statements

235 
WGUS73 KLSX 120202
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
902 PM CDT MON JUN 11 2018

ILC005-027-051-121-120700-
/O.CON.KLSX.FF.W.0011.000000T0000Z-180612T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clinton IL-Bond IL-Marion IL-Fayette IL-
902 PM CDT MON JUN 11 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR
NORTHEASTERN CLINTON...SOUTHEASTERN BOND...NORTHERN MARION AND
SOUTHERN FAYETTE COUNTIES...

At 815 PM CDT, cooperative observer reported highway 51 was closed 
approximately 3 miles south of Patoka Illinois. Up to three or four 
inches of rain have already fallen.

Some locations that will experience flooding include...
Salem, Vandalia, St. Elmo, Kinmundy, Brownstown, Mulberry Grove,
Patoka, Tamalco, Farina, Omega, Stephen Forbes Station, Shobonier,
Fairman, Boulder, Pleasant Mound, Tonti, La Clede, Pittsburg, Iuka
and Keyesport.

This includes the following highways...
 Interstate 70 in Illinois near exit 52, and between exits 68 and 76.
 Interstate 57 in Illinois between exits 127 and 135.

This also includes Carlyle Lake Recreational Area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3868 8933 3891 8933 3903 8881 3891 8881
      3891 8869 3860 8870

$$

Tilly

046 
WGUS73 KLSX 120700
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
200 AM CDT TUE JUN 12 2018

ILC005-027-051-121-120710-
/O.EXP.KLSX.FF.W.0011.000000T0000Z-180612T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clinton IL-Bond IL-Marion IL-Fayette IL-
200 AM CDT TUE JUN 12 2018

...THE FLASH FLOOD WARNING FOR NORTHEASTERN CLINTON...SOUTHEASTERN
BOND...NORTHERN MARION AND SOUTHERN FAYETTE COUNTIES HAS EXPIRED...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 3868 8933 3891 8933 3903 8881 3891 8881
      3891 8869 3860 8870

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:02 PM CDT	Special Weather Statement	LSX	Bond	28 min
Jun 11, 7:33 PM CDT	Special Weather Statement	LSX	Fayette	42 min
Jun 11, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	47 min
Jun 12, 2:44 AM CDT	Special Weather Statement	LSX	Montgomery	61 min
Jun 12, 4:27 AM CDT	Areal Flood Advisory	LSX	Fayette, Marion	3 hr
Jun 12, 5:27 AM CDT	Flash Flood Warning	LSX	Fayette, Marion	6 hr
Jun 12, 6:31 AM CDT	Flash Flood Warning	LSX	Fayette	5 hr
Jun 12, 12:29 PM CDT	River Flood Warning	LSX	Fayette	4 days

Nearby

Flash Flood Warnings in Illinois, 2018 Every flash flood warning in 2018

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.