Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 114, NWS St. Louis, MO

July 9, 2021Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 8:43 PM CDT for Brown County, Illinois. It was in force for 47 min. 5 reports 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: Jul 9, 2021, 8:43 PM CDT (01:43 UTC)
Expired: Jul 9, 2021, 9:30 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 2.5 in
Wind: 60.0 mph

County Brown County, IL

The radar

The Lincoln radar (KILX), 114 km from the middle of the area, began a volume at 01:42 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
Jul 9, 8:48 PM CDT	HAIL 1.75	Mount Sterling, IL	HAIL FELL FOR ABOUT 10 MINUTES. REPORT RELAYED BY NWS DAVENPORT.
Jul 9, 8:50 PM CDT	TSTM WND DMG	Mount Sterling, IL	DAMAGE TO POWER LINE AND A POWER POLE ON THE EAST SIDE OF DOWN. SOCIAL MEDIA REPORT. TIME BASED ON RADAR.
Jul 9, 9:02 PM CDT	TSTM WND DMG	1 Sse Mount Sterling, IL	DELAYED REPORT OF POWERLINES DOWN OVER THE INTERSECTION AT HWY 99 AND HWY 107 JUST SOUTH OF MOUNT STERLING. REPORT COURTESY OF WGEM-TV. TIME ESTIMATED BY RADAR.
Jul 9, 9:03 PM CDT	HAIL 2	1 W Mount Sterling, IL	DELAYED REPORT OF HAIL IN MT. STERLING. PICTURE SHOWS HAIL SIZE OF AT LEAST 2 INCHES ON THE WEST SIDE OF MT. STERLING.
Jul 9, 9:38 PM CDT	HAIL 0.5	4 Wsw Versailles, IL

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
Jul 9, 8:18 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.7 hours before the alert went out and 176 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: 1282 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

021 
WUUS53 KLSX 100143
SVRLSX
ILC009-100230-
/O.NEW.KLSX.SV.W.0114.210710T0143Z-210710T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
843 PM CDT Fri Jul 9 2021

The National Weather Service in St Louis has issued a

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

* Until 930 PM CDT.

* At 842 PM CDT, a severe thunderstorm was located near Mount
  Sterling, moving southeast at 30 mph.

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

  SOURCE...Trained weather spotters.

  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.

* This severe thunderstorm will be near...
  Mount Sterling around 850 PM CDT.
  Buckhorn around 855 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for west central
Illinois.

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

&&

LAT...LON 4010 9070 4009 9070 4008 9067 4005 9068
      4002 9063 4003 9061 4001 9062 4000 9060
      3998 9060 3998 9051 3997 9051 3995 9053
      3992 9054 3988 9058 3984 9058 3984 9091
      4010 9092 4011 9091
TIME...MOT...LOC 0142Z 334DEG 28KT 4006 9075 

HAIL...2.50IN
WIND...60MPH
 
$$

Elmore

1 follow-up statement

972 
WWUS53 KLSX 100202
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
902 PM CDT Fri Jul 9 2021

ILC009-100230-
/O.CON.KLSX.SV.W.0114.000000T0000Z-210710T0230Z/
Brown IL-
902 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR BROWN COUNTY...

At 902 PM CDT, a severe thunderstorm was located over Buckhorn,
moving south at 30 mph.

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

SOURCE...Trained weather spotters reported golf ball size hail in 
         Mt. Sterling.

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.

This severe thunderstorm will remain over mainly rural areas of Brown
County, including the following locations... Versailles, Coopertown,
Mound Station, La Grange and Ripley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CDT for west central
Illinois.

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

&&

LAT...LON 4010 9070 4009 9070 4008 9067 4005 9068
      4002 9063 4003 9061 4001 9062 4000 9060
      3998 9060 3998 9051 3997 9051 3995 9053
      3992 9054 3988 9058 3984 9058 3984 9091
      4010 9092 4011 9091
TIME...MOT...LOC 0202Z 343DEG 24KT 3995 9080 

HAIL...2.50IN
WIND...60MPH
 
$$

Elmore

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	38 min
Jul 9, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams	65 min
Jul 9, 9:17 PM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	43 min
Jul 9, 10:03 PM CDT	Areal Flood Advisory	LSX	Adams, Brown, Pike	3 hr
Jul 9, 11:24 PM CDT	Areal Flood Advisory	LSX	Pike	3 hr
Jul 9, 11:28 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	47 min
Jul 9, 11:57 PM CDT	Areal Flood Advisory	LSX	Calhoun, Greene, Pike	3 hr
Jul 9, 11:59 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	61 min
Jul 10, 12:26 AM CDT	Areal Flood Advisory	LSX	Calhoun, Jersey	3 hr
Jul 10, 12:42 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Monroe, Saint Clair, Washington	63 min
Jul 10, 1:08 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	52 min
Jul 10, 1:36 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Marion, Saint Clair, Washington	54 min
Jul 10, 1:50 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	40 min
Jul 10, 2:49 AM CDT	River Flood Warning	LSX	Calhoun, Greene, Jersey	10 days
Jul 10, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	21 min
Jul 10, 3:11 PM CDT	Areal Flood Advisory	LSX	Macoupin, Madison	3 hr
Jul 10, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion, Randolph, Washington	59 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.