Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS St. Louis, MO

May 6, 2021Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 6, 2021, 3:40 PM CDT for Marion County, Illinois. It was in force for 26 min. 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: May 6, 2021, 3:40 PM CDT (20:40 UTC)
Expired: May 6, 2021, 4:06 PM CDT
In force: 26 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Marion County, IL

The radar

The Evansville,IN radar (KVWX), 113 km from the middle of the area, began a volume at 20:39 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
May 6, 3:44 PM CDT	HAIL 0.25	Centralia, IL

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 12:00Z, 8.7 hours before the alert went out and 181 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: -111 J/kg
Mixed-layer LCL: 1453 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

943 
WUUS53 KLSX 062040
SVRLSX
ILC121-062130-
/O.NEW.KLSX.SV.W.0040.210506T2040Z-210506T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
340 PM CDT Thu May 6 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southern Marion County in south central Illinois...

* Until 430 PM CDT.

* At 340 PM CDT, a severe thunderstorm was located near Odin, moving
  southeast at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Centralia, Salem, Wamac, Central City, Odin, Helm, Tonti, Iuka,
  Junction City, Kell, Walnut Hill, Cartter and Selmaville.

This includes Interstate 57 in Illinois between exits 109 and 116.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3847 8914 3856 8914 3870 8900 3862 8870
      3848 8870
TIME...MOT...LOC 2040Z 305DEG 29KT 3856 8903 

HAIL...1.00IN
WIND...60MPH
 
$$

Maples

1 follow-up statement

692 
WWUS53 KLSX 062106
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
406 PM CDT Thu May 6 2021

ILC121-062115-
/O.CAN.KLSX.SV.W.0040.000000T0000Z-210506T2130Z/
Marion IL-
406 PM CDT Thu May 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARION COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 3847 8914 3856 8914 3870 8900 3862 8870
      3848 8870
TIME...MOT...LOC 2104Z 305DEG 29KT 3844 8881 

$$

Maples

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.