Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 201, NWS St. Louis, MO

December 15, 2021Adams County, Brown County, Illinois; Marion County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Dec 15, 2021, 9:22 PM CST for Adams County, Brown County, Illinois; Marion County, Missouri. It was in force for 53 min. 4 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: Dec 15, 2021, 9:22 PM CST (03:22 UTC)
Expired: Dec 15, 2021, 10:15 PM CST
In force: 53 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Adams County, IL, Brown County, IL, Marion County, MO

The radar

The Lincoln radar (KILX), 141 km from the middle of the area, began a volume at 03:22 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
Dec 15, 9:26 PM CST	TSTM WND DMG	4 N Quincy, IL	1 TO 2 FT DIAMETER TREES DOWN.
Dec 15, 9:29 PM CST	TSTM WND DMG	4 W Burton, IL	LARGE TREE DOWN.
Dec 15, 9:42 PM CST	TSTM WND GST 61	4 Ne Burton, IL	QUINCY REGIONAL BALDWIN FIELD.
Dec 15, 9:43 PM CST	TSTM WND GST 53	4 Ne Burton, IL	QUINCY REGIONAL BALDWIN FIELD.

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
Dec 15, 6:00 PM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.4 hours before the alert went out and 178 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: 229 J/kg
Mixed-layer CIN: -358 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 433 m²/s²
0-3 km storm-relative helicity: 496 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

054 
WUUS53 KLSX 160322
SVRLSX
ILC001-009-MOC127-160415-
/O.NEW.KLSX.SV.W.0201.211216T0322Z-211216T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
922 PM CST Wed Dec 15 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Northern Adams County in west central Illinois...
  Northwestern Brown County in west central Illinois...
  North central Marion County in northeastern Missouri...

* Until 1015 PM CST.

* At 922 PM CST, a severe thunderstorm was located near Quincy,
  moving northeast at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Camp Point and Golden around 940 PM CST.

This includes Interstate 172 between exits 10 and 19.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4019 9091 4011 9091 4011 9072 4010 9070
      4009 9071 4008 9070 4008 9067 4005 9068
      4004 9066 3983 9153 3995 9147 3995 9144
      3998 9146 4020 9135
TIME...MOT...LOC 0322Z 246DEG 51KT 4002 9137 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

3 follow-up statements

546 
WWUS53 KLSX 160338
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
938 PM CST Wed Dec 15 2021

MOC127-160348-
/O.CAN.KLSX.SV.W.0201.000000T0000Z-211216T0415Z/
Marion MO-
938 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MARION COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight CST for
west central Illinois.

LAT...LON 4019 9091 4011 9091 4011 9072 4010 9070
      4009 9071 4008 9070 4008 9067 4005 9068
      4004 9066 3987 9138 4020 9120
TIME...MOT...LOC 0338Z 245DEG 54KT 4010 9111 

$$

ILC001-009-160415-
/O.CON.KLSX.SV.W.0201.000000T0000Z-211216T0415Z/
Adams IL-Brown IL-
938 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CST
FOR NORTHERN ADAMS AND NORTHWESTERN BROWN COUNTIES...

At 938 PM CST, a severe thunderstorm was located near Golden, moving
northeast at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northern Adams and northwestern Brown Counties, including the
following locations... Coatsburg, Burton, Mound Station, Paloma,
Columbus, Loraine, Woodville, Fowler, La Prairie and Chatton.

This includes Interstate 172 between exits 14 and 15.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4019 9091 4011 9091 4011 9072 4010 9070
      4009 9071 4008 9070 4008 9067 4005 9068
      4004 9066 3987 9138 4020 9120
TIME...MOT...LOC 0338Z 245DEG 54KT 4010 9111 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

949 
WWUS53 KLSX 160354
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
954 PM CST Wed Dec 15 2021

ILC001-009-160415-
/O.CON.KLSX.SV.W.0201.000000T0000Z-211216T0415Z/
Adams IL-Brown IL-
954 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CST
FOR NORTHEASTERN ADAMS AND NORTHWESTERN BROWN COUNTIES...

At 954 PM CST, a severe thunderstorm was located near Clayton, moving
east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Clayton, Golden and Mound Station. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4019 9091 4011 9091 4011 9072 4010 9070
      4009 9071 4008 9070 4008 9067 4005 9068
      4004 9066 3995 9107 4019 9098
TIME...MOT...LOC 0354Z 249DEG 46KT 4007 9092 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Elmore

248 
WWUS53 KLSX 160411
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1011 PM CST Wed Dec 15 2021

ILC001-009-160420-
/O.EXP.KLSX.SV.W.0201.000000T0000Z-211216T0415Z/
Adams IL-Brown IL-
1011 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ADAMS AND
NORTHWESTERN BROWN COUNTIES WILL EXPIRE AT 1015 PM CST...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds are still possible with
this thunderstorm.

A Severe Thunderstorm Watch remains in effect until midnight CST for
west central Illinois.

Remember, a Severe Thunderstorm Warning still remains in effect for
southeastern Adams County and central and southern Brown County. 

LAT...LON 4019 9091 4011 9091 4011 9072 4010 9070
      4009 9071 4008 9070 4008 9067 4005 9068
      4004 9066 3995 9107 4019 9098
TIME...MOT...LOC 0410Z 270DEG 51KT 4016 9067 

$$

Elmore

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 9:09 PM CST	Severe Thunderstorm Warning	LSX	Adams, Pike	51 min
Dec 15, 9:48 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Calhoun, Pike	42 min
Dec 15, 8:01 PM CST	Severe Thunderstorm Warning Considerable damage threat	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	44 min
Dec 15, 8:34 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Moniteau, Monroe, Ralls	41 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 Severe Thunderstorm Warnings in Missouri, 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.