Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 97, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 25, 2021, 3:39 PM CDT for Henry County, Illinois. It was in force for 36 min. 2 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, 3:39 PM CDT (20:39 UTC)
- Expired
- Aug 25, 2021, 4:15 PM CDT
- In force
- 36 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
County Henry County, IL
The radar
The Quad Cities radar (KDVN), 57 km from the middle of the area, began a volume at 20:41 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. |
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, 8.7 hours before the alert went out and 54 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.
- 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
The text
As transmitted.
976
WUUS53 KDVN 252039
SVRDVN
ILC073-252115-
/O.NEW.KDVN.SV.W.0097.210825T2039Z-210825T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
339 PM CDT Wed Aug 25 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Southern Henry County in northwestern Illinois...
* Until 415 PM CDT.
* At 338 PM CDT, a severe thunderstorm was located near Woodhull, or
7 miles southwest of Cambridge, moving east at 20 mph.
HAZARD...Ping pong ball size 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.
* This severe thunderstorm will be near...
Cambridge around 345 PM CDT.
Other locations in the path of this severe thunderstorm include
Galva.
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.
&&
LAT...LON 4115 8999 4115 9038 4117 9043 4133 9034
4126 8993
TIME...MOT...LOC 2038Z 292DEG 17KT 4123 9029
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs4 follow-up statements
233
WWUS53 KDVN 252051
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
351 PM CDT Wed Aug 25 2021
ILC073-252115-
/O.CON.KDVN.SV.W.0097.000000T0000Z-210825T2115Z/
Henry IL-
351 PM CDT Wed Aug 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHERN HENRY COUNTY...
At 351 PM CDT, a severe thunderstorm was located near Woodhull, or
near Cambridge, moving east at 15 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe storm will be near...
Cambridge around 355 PM CDT.
Other locations in the path of this severe thunderstorm include
Galva.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4115 8999 4115 9038 4117 9043 4133 9034
4126 8993
TIME...MOT...LOC 2051Z 292DEG 12KT 4122 9027
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs709
WWUS53 KDVN 252053
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
353 PM CDT Wed Aug 25 2021
ILC073-252115-
/O.CON.KDVN.SV.W.0097.000000T0000Z-210825T2115Z/
Henry IL-
353 PM CDT Wed Aug 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHERN HENRY COUNTY...
At 353 PM CDT, a severe thunderstorm was located near Woodhull, or
near Cambridge, moving east at 15 mph.
HAZARD...Golf ball size 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...
Galva.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 4115 8999 4115 9038 4117 9043 4133 9034
4126 8993
TIME...MOT...LOC 2053Z 292DEG 12KT 4122 9026
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs978
WWUS53 KDVN 252059
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
359 PM CDT Wed Aug 25 2021
ILC073-252115-
/O.CON.KDVN.SV.W.0097.000000T0000Z-210825T2115Z/
Henry IL-
359 PM CDT Wed Aug 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHERN HENRY COUNTY...
At 359 PM CDT, a severe thunderstorm was located near Woodhull, or
near Cambridge, moving east at 15 mph.
HAZARD...Two inch hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Galva.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4115 8999 4115 9038 4117 9043 4133 9034
4126 8993
TIME...MOT...LOC 2059Z 292DEG 12KT 4121 9023
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs964
WWUS53 KDVN 252103
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
403 PM CDT Wed Aug 25 2021
ILC073-252115-
/O.CON.KDVN.SV.W.0097.000000T0000Z-210825T2115Z/
Henry IL-
403 PM CDT Wed Aug 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHERN HENRY COUNTY...
At 402 PM CDT, a severe thunderstorm was located near Woodhull, or
near Cambridge, moving east at 20 mph.
THIS IS A DESTRUCTIVE STORM FOR ULAH...BISHOP HILL...NEKOMA AND
GALVA.
HAZARD...Baseball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Kewanee, Cambridge, Galva, Woodhull, Alpha, Andover, Lynn Center,
Bishop Hill, Ophiem, Nekoma, Kewanee Municipal Airport and Ulah.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and 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 4115 8999 4115 9038 4117 9043 4133 9034
4126 8993
TIME...MOT...LOC 2102Z 292DEG 17KT 4120 9021
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
GibbsThe 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, 3:43 PM CDT | Tornado Warning | DVN | Henry | 17 min |
| Aug 25, 4:11 PM CDT | Severe Thunderstorm Warning | DVN | Henry | 49 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, 2021Every 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.