Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS Quad Cities, IA

April 7, 2021Hancock County, McDonough County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 7, 2021, 6:28 PM CDT for Hancock County, McDonough 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: Apr 7, 2021, 6:28 PM CDT (23:28 UTC)
Expired: Apr 7, 2021, 7:15 PM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hancock County, IL, McDonough County, IL

The radar

The Quad Cities radar (KDVN), 145 km from the middle of the area, began a volume at 23:30 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
Apr 7, 6:30 PM CDT	TSTM WND DMG	1 N West Point, IL	SPLIT POWER POLE.
Apr 7, 6:38 PM CDT	TSTM WND DMG	Bowen, IL	SEVERAL ONE INCH DIAMETER TREE LIMBS DOWN.
Apr 7, 6:46 PM CDT	TSTM WND GST 40	2 Ene Denver, IL	ALONG WITH TORRENTIAL RAIN AND FREQUENT LIGHTNING.
Apr 7, 6:50 PM CDT	TSTM WND DMG	1 N Augusta, IL	4 INCH TREE BRANCHES BROKEN.
Apr 7, 7:04 PM CDT	TSTM WND GST 55	4 Se Blandinsville, IL

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 149 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: 7 J/kg
Mixed-layer CIN: -292 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

430 
WUUS53 KDVN 072328
SVRDVN
ILC067-109-080015-
/O.NEW.KDVN.SV.W.0001.210407T2328Z-210408T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
628 PM CDT Wed Apr 7 2021

The National Weather Service in the Quad Cities has issued a

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

* Until 715 PM CDT.

* At 628 PM CDT, severe thunderstorms were located along a line
  extending from near Hamilton to near Clayton, moving north at 45
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fort Madison, Keokuk, Carthage, Hamilton, Warsaw, La Harpe, Dallas
  City, Blandinsville, Augusta, Bowen, West Point, Ferris, Colusa,
  Adrian, Burnside, Niota, Colmar, Disco, Plymouth and Denver.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4020 9145 4039 9139 4040 9137 4042 9138
      4063 9131 4064 9126 4064 9078 4028 9088
      4028 9091 4020 9091
TIME...MOT...LOC 2328Z 200DEG 40KT 4036 9131 4002 9101 

HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

4 follow-up statements

072 
WWUS53 KDVN 072344
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
644 PM CDT Wed Apr 7 2021

ILC067-109-080015-
/O.CON.KDVN.SV.W.0001.000000T0000Z-210408T0015Z/
Hancock IL-McDonough IL-
644 PM CDT Wed Apr 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR HANCOCK AND WESTERN MCDONOUGH COUNTIES...

At 644 PM CDT, severe thunderstorms were located along a line
extending from near Adrian to near Augusta, moving north at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Fort Madison, Keokuk, Carthage, Hamilton, Warsaw, La Harpe, Dallas
City, Blandinsville, Augusta, Bowen, West Point, Ferris, Colusa,
Adrian, Burnside, Niota, Colmar, Disco, Plymouth and Denver.

LAT...LON 4020 9145 4039 9139 4040 9137 4042 9138
      4063 9131 4064 9126 4064 9078 4028 9088
      4028 9091 4020 9091
TIME...MOT...LOC 2344Z 196DEG 44KT 4051 9127 4025 9092 

HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

782 
WWUS53 KDVN 072355
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
655 PM CDT Wed Apr 7 2021

ILC067-109-080015-
/O.CON.KDVN.SV.W.0001.000000T0000Z-210408T0015Z/
Hancock IL-McDonough IL-
655 PM CDT Wed Apr 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR HANCOCK AND WESTERN MCDONOUGH COUNTIES...

At 655 PM CDT, severe thunderstorms were located along a line
extending from Dallas City to near Tennessee, moving north at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Fort Madison, Carthage, La Harpe, Dallas City, Blandinsville,
Augusta, Bowen, West Point, Ferris, Colusa, Adrian, Burnside, Disco,
Niota, Colmar, Plymouth, Denver, Fountain Green, Elvaston and
Pontoosuc.

LAT...LON 4020 9117 4050 9135 4063 9131 4064 9126
      4064 9078 4028 9088 4028 9091 4020 9091
TIME...MOT...LOC 2355Z 195DEG 38KT 4064 9120 4043 9087 

HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

176 
WWUS53 KDVN 080006
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
706 PM CDT Wed Apr 7 2021

ILC067-109-080015-
/O.CON.KDVN.SV.W.0001.000000T0000Z-210408T0015Z/
Hancock IL-McDonough IL-
706 PM CDT Wed Apr 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN HANCOCK AND WESTERN MCDONOUGH COUNTIES...

At 706 PM CDT, severe thunderstorms were located along a line
extending from near Carman to near Blandinsville, moving north at 45
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Carthage, La Harpe, Dallas City, Blandinsville, Ferris, Colusa,
Adrian, Burnside, Disco, Colmar, Plymouth, Fountain Green, Pontoosuc
and Webster.

LAT...LON 4043 9119 4052 9123 4064 9126 4064 9078
      4028 9088 4028 9091
TIME...MOT...LOC 0006Z 200DEG 40KT 4074 9115 4053 9082 

HAIL...<.75IN
WIND...60MPH
 
$$

Uttech

851 
WWUS53 KDVN 080013
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
713 PM CDT Wed Apr 7 2021

ILC067-109-080022-
/O.EXP.KDVN.SV.W.0001.000000T0000Z-210408T0015Z/
Hancock IL-McDonough IL-
713 PM CDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HANCOCK AND
WESTERN MCDONOUGH COUNTIES WILL EXPIRE AT 715 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

LAT...LON 4043 9119 4052 9123 4064 9126 4064 9078
      4028 9088 4028 9091
TIME...MOT...LOC 0012Z 200DEG 40KT 4080 9112 4059 9079 

$$

Uttech

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.