Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Quad Cities, IA

June 20, 2021McDonough County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 20, 2021, 10:23 PM CDT for McDonough County, Illinois. It was in force for 22 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: Jun 20, 2021, 10:23 PM CDT (03:23 UTC)
Expired: Jun 20, 2021, 10:45 PM CDT
In force: 22 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County McDonough County, IL

The radar

The Lincoln radar (KILX), 119 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
Jun 20, 10:28 PM CDT	TSTM WND GST 60	Colchester, IL	CORRECTS PREVIOUS TSTM WND GST REPORT FROM COLCHESTER. ALSO A TREE DOWN.
Jun 20, 10:33 PM CDT	TSTM WND DMG	1 Sw Macomb, IL	LARGE TREE DOWN ON HIGHWAY 136 BLOCKING THE WEST BOUND LANES.
Jun 20, 10:34 PM CDT	TSTM WND GST 60	Macomb, IL	WIND ESTIMATED.

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
Jun 20, 8:10 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.4 hours before the alert went out and 125 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: 1058 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.8

Open this sounding in Storm Lab

The text

As transmitted.

523 
WUUS53 KDVN 210323
SVRDVN
ILC109-210345-
/O.NEW.KDVN.SV.W.0023.210621T0323Z-210621T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1023 PM CDT Sun Jun 20 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northern McDonough County in west central Illinois...

* Until 1045 PM CDT.

* At 1023 PM CDT, a severe thunderstorm was located over Good Hope,
  or near Macomb, moving east at 55 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Bushnell and Adair around 1030 PM CDT.
  Prairie City and New Philadelphia around 1035 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4043 9082 4063 9078 4062 9045 4041 9045
TIME...MOT...LOC 0323Z 270DEG 46KT 4052 9065 

HAIL...0.88IN
WIND...60MPH
 
$$

Speck

1 follow-up statement

367 
WWUS53 KDVN 210339
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1039 PM CDT Sun Jun 20 2021

ILC109-210349-
/O.EXP.KDVN.SV.W.0023.000000T0000Z-210621T0345Z/
McDonough IL-
1039 PM CDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MCDONOUGH COUNTY WILL
EXPIRE AT 1045 PM CDT...
        
The storm which prompted the warning has moved out of the 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 100 AM CDT for
west central Illinois.

LAT...LON 4043 9082 4063 9078 4062 9045 4041 9045
TIME...MOT...LOC 0339Z 270DEG 46KT 4052 9040 

$$

Speck

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 8:04 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	41 min
Jun 20, 8:19 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess	41 min
Jun 20, 8:37 PM CDT	Tornado Warning	DVN	Hancock, Henderson	39 min
Jun 20, 8:53 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	67 min
Jun 20, 9:18 PM CDT	Special Weather Statement	DVN	Henderson	42 min
Jun 20, 9:29 PM CDT	Special Weather Statement	DVN	Henderson	46 min
Jun 20, 9:36 PM CDT	Special Weather Statement	DVN	Whiteside	39 min
Jun 20, 9:47 PM CDT	Special Weather Statement	DVN	Bureau, Henry	43 min
Jun 20, 10:03 PM CDT	Special Weather Statement	DVN	Hancock, McDonough	27 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.