Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Quad Cities, IA

August 25, 2021Henry County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 25, 2021, 4:11 PM CDT for Henry County, Illinois. It was in force for 49 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: Aug 25, 2021, 4:11 PM CDT (21:11 UTC)
Expired: Aug 25, 2021, 5:00 PM CDT
In force: 49 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.0 in
Wind: 70.0 mph

County Henry County, IL

The radar

The Quad Cities radar (KDVN), 66 km from the middle of the area, began a volume at 21:12 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
Aug 25, 4:12 PM CDT	HAIL 1.75	3 W Galva, IL
Aug 25, 4:15 PM CDT	TSTM WND DMG	Bishop Hill, IL	EM REPORTS NUMEROUS TREE LIMBS DOWN ACROSS THE COUNTY ALONG WITH POWERLINES DOWN FROM THE WIND. A FEW HOUSES HAD SHINGLES REMOVED AS WELL AS THE STORM MOVED THROUGH THE COUNTY.
Aug 25, 4:28 PM CDT	TSTM WND GST 60	1 Nne Nekoma, IL	ESTIMATED 60 MPH WIND GUST JUST NORTH OF NAKOMA.

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, 9.2 hours before the alert went out and 62 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: 818 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1355 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

639 
WUUS53 KDVN 252111
SVRDVN
ILC073-252200-
/O.NEW.KDVN.SV.W.0098.210825T2111Z-210825T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
411 PM CDT Wed Aug 25 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Henry County in northwestern Illinois...

* Until 500 PM CDT.

* At 411 PM CDT, a severe thunderstorm was located near Galva, or 8
  miles southeast of Cambridge, moving east at 20 mph.

  HAZARD...Two inch hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* This severe thunderstorm will be near...
  Galva around 420 PM CDT.

Other locations in the path of this severe thunderstorm include
Kewanee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4123 8987 4115 8987 4115 9033 4131 9023
      4125 8986 4123 8986
TIME...MOT...LOC 2111Z 291DEG 18KT 4120 9010 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Gibbs

5 follow-up statements

683 
WWUS53 KDVN 252117
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
417 PM CDT Wed Aug 25 2021

ILC073-252200-
/O.CON.KDVN.SV.W.0098.000000T0000Z-210825T2200Z/
Henry IL-
417 PM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN HENRY COUNTY...

At 416 PM CDT, a severe thunderstorm was located over Galva, or 8
miles southwest of Kewanee, moving east at 20 mph.

HAZARD...70 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

This severe storm will be near...
  Galva around 420 PM CDT.
  Kewanee around 430 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4123 8987 4115 8987 4115 9033 4131 9023
      4125 8986 4123 8986
TIME...MOT...LOC 2116Z 291DEG 18KT 4119 9006 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Gibbs

696 
WWUS53 KDVN 252129
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
429 PM CDT Wed Aug 25 2021

ILC073-252200-
/O.CON.KDVN.SV.W.0098.000000T0000Z-210825T2200Z/
Henry IL-
429 PM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN HENRY COUNTY...

At 429 PM CDT, a severe thunderstorm was located over Galva, or 8
miles southwest of Kewanee, moving southeast at 10 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Emergency management.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
  Galva and Kewanee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4123 8987 4115 8987 4115 9033 4131 9023
      4125 8986 4123 8986
TIME...MOT...LOC 2129Z 295DEG 10KT 4119 9008 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Gibbs

342 
WWUS53 KDVN 252136
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
436 PM CDT Wed Aug 25 2021

ILC073-252200-
/O.CON.KDVN.SV.W.0098.000000T0000Z-210825T2200Z/
Henry IL-
436 PM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN HENRY COUNTY...

At 436 PM CDT, a severe thunderstorm was located over Galva, or 8
miles southwest of Kewanee, moving southeast at 10 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Emergency management.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

This severe storm will be near...
  Galva around 440 PM CDT.

Other locations in the path of this severe thunderstorm include
Kewanee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a potentially deadly storm. Seek shelter in an interior room
on the lowest floor of a well-built structure. Abandon vehicles in
search of a more substantial permanent structure. Stay away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4123 8987 4115 8987 4115 9026 4130 9016
      4125 8986 4123 8986
TIME...MOT...LOC 2136Z 295DEG 10KT 4118 9006 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Gibbs

610 
WWUS53 KDVN 252148
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
448 PM CDT Wed Aug 25 2021

ILC073-252200-
/O.CON.KDVN.SV.W.0098.000000T0000Z-210825T2200Z/
Henry IL-
448 PM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHEASTERN HENRY COUNTY...

At 448 PM CDT, a severe thunderstorm was located over Galva, or near
Kewanee, moving east at 20 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 remain over mainly rural areas of
southeastern Henry County, including the following locations...
Kewanee Municipal Airport, Bishop Hill and Nekoma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4123 8987 4115 8987 4115 9021 4128 9007
      4125 8986 4123 8986
TIME...MOT...LOC 2148Z 291DEG 18KT 4116 8999 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gibbs

456 
WWUS53 KDVN 252153
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
453 PM CDT Wed Aug 25 2021

ILC073-252201-
/O.EXP.KDVN.SV.W.0098.000000T0000Z-210825T2200Z/
Henry IL-
453 PM CDT Wed Aug 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HENRY COUNTY WILL
EXPIRE AT 500 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 and heavy rain are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.

LAT...LON 4123 8987 4115 8987 4115 9021 4128 9007
      4125 8986 4123 8986
TIME...MOT...LOC 2151Z 291DEG 18KT 4115 8997 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 7:22 PM CDT	Special Weather Statement	DVN	Henry	53 min
Aug 25, 3:37 PM CDT	Special Weather Statement	DVN	Henry	53 min
Aug 25, 3:39 PM CDT	Severe Thunderstorm Warning	DVN	Henry	36 min
Aug 25, 3:43 PM CDT	Tornado Warning Tornado observed	DVN	Henry	17 min
Aug 25, 4:46 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	29 min
Aug 25, 4:59 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	46 min
Aug 25, 6:12 PM CDT	Special Weather Statement	DVN	McDonough	33 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.