Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 120, NWS St. Louis, MO

July 9, 2021Brown County, Pike County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 2021, 9:17 PM CDT for Brown County, Pike County, Illinois. It was in force for 43 min. 3 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, 9:17 PM CDT (02:17 UTC)
Expired: Jul 9, 2021, 10:00 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Brown County, IL, Pike County, IL

The radar

The St Louis radar (KLSX), 114 km from the middle of the area, began a volume at 02:17 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, 9:36 PM CDT	TSTM WND DMG	Perry, IL	NUMEROUS TREES DOWN ALONG HIGHWAY 107 NORTH AND SOUTH OF PERRY. TIME ESTIMATED FROM RADAR.
Jul 9, 9:38 PM CDT	HAIL 0.5	4 Wsw Versailles, IL
Jul 9, 9:50 PM CDT	TSTM WND DMG	Griggsville, IL	POWER POLE DOWN IN TOWN. TIME ESTIMATED FROM RADAR.

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, 2.3 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: 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.

190 
WUUS53 KLSX 100217
SVRLSX
ILC009-149-100300-
/O.NEW.KLSX.SV.W.0120.210710T0217Z-210710T0300Z/

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

The National Weather Service in St Louis has issued a

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

* Until 1000 PM CDT.

* At 917 PM CDT, a severe thunderstorm was located near Buckhorn,
  moving southeast at 20 mph.

  HAZARD...Two inch 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...
  Griggsville.

This includes Interstate 72 between exits 31 and 35.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3988 9058 3986 9058 3983 9057 3979 9060
      3976 9061 3971 9065 3969 9065 3964 9061
      3962 9061 3954 9057 3952 9058 3952 9092
      3989 9091
TIME...MOT...LOC 0217Z 328DEG 19KT 3987 9073 

HAIL...2.00IN
WIND...60MPH
 
$$

Elmore

1 follow-up statement

987 
WWUS53 KLSX 100241
SVSLSX

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

ILC009-149-100300-
/O.CON.KLSX.SV.W.0120.000000T0000Z-210710T0300Z/
Pike IL-Brown IL-
941 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR NORTHEASTERN PIKE AND SOUTHWESTERN BROWN COUNTIES IN WEST CENTRAL
ILLINOIS...

At 941 PM CDT, a severe thunderstorm was located near Griggsville,
moving southeast at 25 mph.

HAZARD...Two inch 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...
Pittsfield, Griggsville, Independence, Bedford, Montezuma,
Versailles, Perry, Milton, Baylis, Chambersburg, New Salem, Detroit,
Florence, Time, Valley City, New Hartford, Fishhook and Summer Hill.

This includes Interstate 72 between exits 31 and 35.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3988 9058 3986 9058 3983 9057 3979 9060
      3976 9061 3971 9065 3969 9065 3964 9061
      3962 9061 3954 9057 3952 9058 3952 9092
      3989 9091
TIME...MOT...LOC 0241Z 330DEG 21KT 3979 9077 

HAIL...2.00IN
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, 8:43 PM CDT	Severe Thunderstorm Warning	LSX	Brown	47 min
Jul 9, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams	65 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.