Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS St. Louis, MO

May 3, 2021Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 3, 2021, 4:13 PM CDT for Brown County, Illinois. It was in force for 28 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 3, 2021, 4:13 PM CDT (21:13 UTC)
Expired: May 3, 2021, 4:41 PM CDT
In force: 28 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Brown County, IL

The radar

The Lincoln radar (KILX), 111 km from the middle of the area, began a volume at 21:14 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 3, 4:15 PM CDT	HAIL 1	2 Sse Mount Sterling, IL	QUARTER SIZED HAIL REPORTED AT THE WESTERN ILLINOIS CORRECTIONAL FACILITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 3, 2:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.2 hours before the alert went out and 173 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

271 
WUUS53 KLSX 032113
SVRLSX
ILC009-032200-
/O.NEW.KLSX.SV.W.0034.210503T2113Z-210503T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
413 PM CDT Mon May 3 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Brown County in west central Illinois...

* Until 500 PM CDT.

* At 412 PM CDT, a severe thunderstorm was located over Buckhorn,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Mount Sterling, Buckhorn, La Grange, Versailles, Ripley and
  Coopertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4005 9067 4005 9066 4002 9063 4003 9061
      4001 9062 4000 9060 3998 9060 3998 9051
      3997 9051 3995 9053 3992 9054 3988 9058
      3984 9058 3984 9088 4007 9077 4008 9067
TIME...MOT...LOC 2112Z 270DEG 38KT 3993 9078 

HAIL...1.25IN
WIND...60MPH
 
$$

Glass

3 follow-up statements

985 
WWUS53 KLSX 032121
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
421 PM CDT Mon May 3 2021

ILC009-032200-
/O.CON.KLSX.SV.W.0034.000000T0000Z-210503T2200Z/
Brown IL-
421 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR CENTRAL BROWN COUNTY...

At 421 PM CDT, a severe thunderstorm was located near Mount Sterling,
moving east at 45 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
La Grange, Versailles, Ripley and Coopertown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4005 9067 4005 9066 4002 9063 4003 9061
      4001 9062 4000 9060 3998 9060 3998 9051
      3997 9051 3995 9053 3992 9054 3988 9058
      3984 9058 3990 9081 4001 9072 4008 9067
TIME...MOT...LOC 2121Z 263DEG 40KT 3995 9067 

HAIL...1.75IN
WIND...60MPH
 
$$

Glass

556 
WWUS53 KLSX 032128
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
428 PM CDT Mon May 3 2021

ILC009-032200-
/O.CON.KLSX.SV.W.0034.000000T0000Z-210503T2200Z/
Brown IL-
428 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN BROWN COUNTY...

At 427 PM CDT, a severe thunderstorm was located 8 miles north of
Meredosia, moving east at 45 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Law Enforcement reported quarter size hail south of Mount 
         Sterling.

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

Locations impacted include...
La Grange and Coopertown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4000 9064 4001 9062 4000 9060 3998 9060
      3998 9051 3997 9051 3995 9053 3992 9054
      3988 9058 3988 9061 3991 9070 3996 9067
TIME...MOT...LOC 2127Z 270DEG 38KT 3995 9058 

HAIL...1.25IN
WIND...60MPH
 
$$

Glass

663 
WWUS53 KLSX 032141
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
441 PM CDT Mon May 3 2021

ILC009-032151-
/O.CAN.KLSX.SV.W.0034.000000T0000Z-210503T2200Z/
Brown IL-
441 PM CDT Mon May 3 2021

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

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
west central Illinois.

LAT...LON 4000 9064 4001 9062 4000 9060 3998 9060
      3998 9051 3997 9051 3995 9053 3992 9054
      3988 9058 3988 9061 3991 9070 3996 9067
TIME...MOT...LOC 2140Z 270DEG 38KT 3995 9039 

$$

Glass

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Adams	51 min
May 3, 3:27 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	48 min
May 3, 6:13 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	47 min
May 3, 6:32 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Macoupin	32 min
May 3, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	23 min

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.