Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 60, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 15, 2021, 12:07 AM CDT for Carroll County, Whiteside County, Illinois. It was in force for 23 min. 1 report 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 15, 2021, 12:07 AM CDT (05:07 UTC)
- Expired
- Jul 15, 2021, 12:30 AM CDT
- In force
- 23 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Carroll County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 73 km from the middle of the area, began a volume at 05:11 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 15, 12:10 AM CDT | TSTM WND DMG | Lanark, IL | LARGE TREE BRANCH REPORTED DOWN JUST OUTSIDE OF TOWN. |
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 00:00Z, 5.1 hours before the alert went out and 67 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
- 2569 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 23.4
The text
As transmitted.
734
WUUS53 KDVN 150507
SVRDVN
ILC015-195-150530-
/O.NEW.KDVN.SV.W.0060.210715T0507Z-210715T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1207 AM CDT Thu Jul 15 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Northeastern Whiteside County in northwestern Illinois...
Southeastern Carroll County in northwestern Illinois...
* Until 1230 AM CDT.
* At 1207 AM CDT, a severe thunderstorm was located over Fairhaven,
or 9 miles south of Mount Carroll, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Chadwick and Coleta around 1215 AM CDT.
Lanark and Milledgeville around 1220 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and 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 4182 9000 4201 9011 4219 8969 4193 8969
4193 8963 4188 8963
TIME...MOT...LOC 0507Z 250DEG 38KT 4195 8996
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
Gibbs1 follow-up statement
520
WWUS53 KDVN 150519 RRA
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
1219 AM CDT Thu Jul 15 2021
ILC015-195-150530-
/O.CON.KDVN.SV.W.0060.000000T0000Z-210715T0530Z/
Whiteside IL-Carroll IL-
1219 AM CDT Thu Jul 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHEASTERN WHITESIDE AND SOUTHEASTERN CARROLL COUNTIES...
At 1219 AM CDT, a severe thunderstorm was located over Milledgeville,
or 11 miles southeast of Mount Carroll, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
northeastern Whiteside and southeastern Carroll Counties, including
the following locations... Hitt, Malvern, Franklin Corners, White
Pigeon, Carroll County Fairgrounds and Penrose.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4183 8997 4196 8990 4207 8996 4219 8969
4193 8969 4193 8963 4188 8963
TIME...MOT...LOC 0519Z 250DEG 38KT 4199 8980
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
GibbsThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 11:10 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess | 50 min |
| Jul 14, 11:41 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 34 min |
| Jul 15, 12:05 AM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 25 min |
| Jul 15, 1:01 AM CDT | Special Weather Statement | DVN | Rock Island | 89 min |
| Jul 15, 1:51 PM CDT | Special Weather Statement | DVN | McDonough | 39 min |
| Jul 15, 2:31 PM CDT | Special Weather Statement | DVN | McDonough | 29 min |
| Jul 15, 5:23 PM CDT | Special Weather Statement | DVN | Whiteside | 37 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.