Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 62, NWS Paducah, KY

October 24, 2021Jackson County, Illinois

NWS Paducah, KY issued this flash flood warning at Oct 24, 2021, 11:34 PM CDT for Jackson County, Illinois. It was in force for 6 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: Oct 24, 2021, 11:34 PM CDT (04:34 UTC)
Expired: Oct 25, 2021, 5:45 AM CDT
In force: 6 hr
Issued by: NWS Paducah, KY
Area: Storm-based polygon
Flood severity: None

County Jackson County, IL

The radar

The Paducah radar (KPAH), 96 km from the middle of the area, began a volume at 04:35 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, 4.6 hours before the alert went out and 282 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: 3 J/kg
Mixed-layer CIN: -286 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 371 m²/s²
0-3 km storm-relative helicity: 467 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

As transmitted.

274 
WGUS53 KPAH 250434
FFWPAH
ILC077-251045-
/O.NEW.KPAH.FF.W.0062.211025T0434Z-211025T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Paducah KY
1134 PM CDT Sun Oct 24 2021

The National Weather Service in Paducah has issued a

* Flash Flood Warning for...
  Jackson County in southern Illinois...

* Until 545 AM CDT Monday.

* At 1134 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 1.5 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Carbondale, Murphysboro, De Soto, Elkville, Hurst, Ava, Grand 
  Tower, Cedar Lake Area, Makanda, Dowell, Campbell Hill, Vergennes 
  and Gorham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3795 8915 3760 8915 3760 8942 3760 8945
      3756 8947 3758 8950 3757 8952 3758 8952
      3759 8949 3759 8948 3764 8952 3769 8952
      3771 8958 3775 8962 3775 8965 3776 8967
      3779 8966 3782 8968 3783 8966 3796 8960

FLASH FLOOD...RADAR INDICATED

$$

PS

1 follow-up statement

722 
WGUS73 KPAH 250546
FFSPAH

Flash Flood Statement
National Weather Service Paducah KY
1246 AM CDT Mon Oct 25 2021

ILC077-251045-
/O.CON.KPAH.FF.W.0062.000000T0000Z-211025T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jackson IL-
1246 AM CDT Mon Oct 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT EARLY THIS 
MORNING FOR JACKSON COUNTY...

At 1246 AM CDT, around 3 inches or so of rain have fallen at some 
locations in the warned area. Though the rainfall has now ended in 
the warned area, it may take awhile for any flooding to recede. 
Please continue to head any road closures.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

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...
  Carbondale, Murphysboro, De Soto, Elkville, Hurst, Ava, Grand 
  Tower, Cedar Lake Area, Makanda, Dowell, Campbell Hill, Vergennes 
  and Gorham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3795 8915 3760 8915 3760 8942 3760 8945
      3756 8947 3758 8950 3757 8952 3758 8952
      3759 8949 3759 8948 3764 8952 3769 8952
      3771 8958 3775 8962 3775 8965 3776 8967
      3779 8966 3782 8968 3783 8966 3796 8960

FLASH FLOOD...RADAR INDICATED

$$

PS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 24, 9:42 PM CDT	Severe Thunderstorm Warning	PAH	Jackson	48 min
Oct 24, 10:01 PM CDT	Tornado Warning	PAH	Jefferson	6 min
Oct 24, 10:24 PM CDT	Special Weather Statement	PAH	Jackson	51 min
Oct 24, 11:37 PM CDT	Severe Thunderstorm Warning	PAH	Alexander, Union	38 min
Oct 25, 12:33 AM CDT	Special Weather Statement	PAH	Massac	27 min

Nearby

Flash Flood Warnings in Illinois, 2021 Every flash flood warning in 2021

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.