Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 79, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 11, 2021, 6:24 AM CDT for Henderson County, Warren County, Illinois; Des Moines County, Iowa. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2021, 6:24 AM CDT (11:24 UTC)
- Expired
- Aug 11, 2021, 6:46 AM CDT
- In force
- 22 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Des Moines County, IA, Henderson County, IL, Warren County, IL
The radar
The Quad Cities radar (KDVN), 88 km from the middle of the area, began a volume at 11:28 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 11.4 hours before the alert went out and 91 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
- 856 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 940 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -1.4
The text
As transmitted.
790
WUUS53 KDVN 111124
SVRDVN
ILC071-187-IAC057-111200-
/O.NEW.KDVN.SV.W.0079.210811T1124Z-210811T1200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
624 AM CDT Wed Aug 11 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Northern Henderson County in west central Illinois...
West central Warren County in west central Illinois...
Eastern Des Moines County in southeastern Iowa...
* Until 700 AM CDT.
* At 623 AM CDT, a severe thunderstorm was located near West
Burlington, or near Burlington, moving east at 35 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* This severe thunderstorm will be near...
Burlington and Gulf Port around 635 AM CDT.
Other locations in the path of this severe thunderstorm include
Gladstone, Oquawka, Biggsville, Rozetta and Kirkwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
&&
LAT...LON 4078 9112 4098 9116 4107 9080 4080 9072
TIME...MOT...LOC 1123Z 256DEG 31KT 4086 9121
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
DC1 follow-up statement
276
WWUS53 KDVN 111146
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
646 AM CDT Wed Aug 11 2021
IAC057-ILC071-187-111156-
/O.CAN.KDVN.SV.W.0079.000000T0000Z-210811T1200Z/
Henderson IL-Warren IL-Des Moines IA-
646 AM CDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN HENDERSON...WEST
CENTRAL WARREN AND EASTERN DES MOINES COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 4078 9112 4098 9116 4107 9080 4080 9072
TIME...MOT...LOC 1144Z 256DEG 31KT 4090 9098
$$
DCThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 5:56 AM CDT | Severe Thunderstorm Warning | DVN | Hancock | 19 min |
| Aug 11, 6:24 AM CDT | Special Weather Statement | DVN | McDonough | 36 min |
| Aug 11, 6:38 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer, Warren | 37 min |
| Aug 11, 6:59 AM CDT | Flash Flood Warning | DVN | Hancock, Henderson | 3 hr |
| Aug 11, 7:32 AM CDT | Special Weather Statement | DVN | Rock Island | 28 min |
| Aug 11, 7:55 AM CDT | Special Weather Statement | DVN | Bureau, Henry, Whiteside | 65 min |
| Aug 11, 8:07 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Rock Island, Whiteside | 53 min |
| Aug 11, 8:16 AM CDT | High Wind Warning | DVN | Henderson, Henry, Mercer, Rock Island, Warren, Whiteside | 104 min |
| Aug 11, 8:33 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam, Whiteside | 57 min |
| Aug 11, 9:46 AM CDT | Areal Flood Warning | DVN | Henderson | 3 hr |
| Aug 11, 9:59 AM CDT | Special Weather Statement | DVN | McDonough | 31 min |
| Aug 11, 10:45 AM CDT | Special Weather Statement | DVN | Henderson, Warren | 30 min |
| Aug 11, 10:57 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, McDonough, Warren | 33 min |
| Aug 11, 5:38 AM CDT | Special Weather Statement | DVN | Lee | 37 min |
| Aug 11, 6:10 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee | 20 min |
| Aug 11, 7:04 AM CDT | Special Weather Statement | DVN | Muscatine | 26 min |
| Aug 11, 10:24 AM CDT | Special Weather Statement | DVN | Lee | 21 min |
| Aug 11, 3:36 PM CDT | Special Weather Statement | DVN | Washington | 24 min |
| Aug 11, 4:26 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 49 min |
| Aug 11, 5:11 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jackson, Jones | 49 min |
| Aug 11, 5:38 PM CDT | Tornado Warning | DVN | Dubuque | 13 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2021Severe Thunderstorm Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.