Alert archive / Illinois / Flash Flood Warnings in 2023

Flash Flood Warning 21, NWS Paducah, KY

April 15, 2023Johnson County, Union County, Illinois

NWS Paducah, KY issued this flash flood warning at Apr 15, 2023, 10:18 PM CDT for Johnson County, Union County, Illinois. It was in force for 2 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: Apr 15, 2023, 10:18 PM CDT (03:18 UTC)
Expired: Apr 16, 2023, 12:20 AM CDT
In force: 2 hr
Issued by: NWS Paducah, KY
Area: Storm-based polygon
Flood severity: None

Counties Johnson County, IL, Union County, IL

The radar

The Paducah radar (KPAH), 55 km from the middle of the area, began a volume at 03:21 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

Nashville Metro, TN (KBNA), launched 00:00Z, 3.3 hours before the alert went out and 268 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: 81 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1798 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

726 
WGUS53 KPAH 160318
FFWPAH
ILC087-181-160930-
/O.NEW.KPAH.FF.W.0021.230416T0318Z-230416T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Paducah KY
1018 PM CDT Sat Apr 15 2023

The National Weather Service in Paducah has issued a

* Flash Flood Warning for...
  Western Johnson County in southern Illinois...
  Eastern Union County in southern Illinois...

* Until 430 AM CDT Sunday.

* At 1018 PM CDT, Radar and rain gauges indicated 2 to 3 inches of 
  rain has fallen since 9pm.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and rain gauges

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Vienna, Goreville, Dongola, Lake Of Egypt Area, Cypress and 
  Buncombe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3737 8920 3758 8922 3759 8921 3759 8904
      3759 8881 3734 8894

FLASH FLOOD...RADAR INDICATED

$$

PAH

1 follow-up statement

600 
WGUS73 KPAH 160520
FFSPAH

Flash Flood Statement
National Weather Service Paducah KY
1220 AM CDT Sun Apr 16 2023

ILC087-181-160530-
/O.CAN.KPAH.FF.W.0021.000000T0000Z-230416T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Johnson IL-Union IL-
1220 AM CDT Sun Apr 16 2023

...FLASH FLOOD WARNING IS CANCELLED FOR WESTERN JOHNSON AND EASTERN 
UNION COUNTIES...

The heavy rain has ended. Coordination with local authorities 
confirms no ongoing flood issues, and with flooding no longer 
expected to pose a threat, the warning has been cancelled. Please 
continue to heed remaining road closures.

LAT...LON 3737 8920 3758 8922 3759 8921 3759 8904
      3759 8881 3734 8894

$$

07

The office that day

Everything else NWS Paducah, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 15, 7:22 PM CDT	Severe Thunderstorm Warning	PAH	Perry	38 min
Apr 15, 7:48 PM CDT	Severe Thunderstorm Warning	PAH	Jefferson	57 min
Apr 15, 7:55 PM CDT	Severe Thunderstorm Warning	PAH	Jackson	17 min
Apr 15, 8:29 PM CDT	Special Weather Statement	PAH	Wayne	46 min
Apr 15, 8:30 PM CDT	Severe Thunderstorm Warning	PAH	Alexander, Union	45 min
Apr 15, 8:32 PM CDT	Severe Thunderstorm Warning	PAH	Alexander, Johnson, Pulaski, Union, Williamson	43 min
Apr 15, 8:58 PM CDT	Special Weather Statement	PAH	Gallatin, Hamilton, Saline, White	47 min
Apr 15, 9:18 PM CDT	Special Weather Statement	PAH	Alexander, Pulaski	42 min
Apr 15, 9:23 PM CDT	Severe Thunderstorm Warning	PAH	Johnson, Pope, Saline, Union, Williamson	52 min
Apr 15, 10:00 PM CDT	Special Weather Statement	PAH	Massac	45 min
Apr 15, 10:17 PM CDT	Special Weather Statement	PAH	Hardin, Pope	43 min

Nearby

Flash Flood Warnings in Illinois, 2023 Every flash flood warning in 2023

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.