Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 96, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 24, 2021, 6:07 PM CDT for Cedar County, Johnson County, Linn County, Iowa. It was in force for 38 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 24, 2021, 6:07 PM CDT (23:07 UTC)
- Expired
- Aug 24, 2021, 6:45 PM CDT
- In force
- 38 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cedar County, IA, Johnson County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 23:06 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.1 hours before the alert went out and 75 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
- 1809 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
453
WUUS53 KDVN 242307
SVRDVN
IAC031-103-113-242345-
/O.NEW.KDVN.SV.W.0096.210824T2307Z-210824T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
607 PM CDT Tue Aug 24 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Northern Cedar County in east central Iowa...
Northeastern Johnson County in east central Iowa...
Southeastern Linn County in east central Iowa...
* Until 645 PM CDT.
* At 607 PM CDT, a severe thunderstorm was located over Mount Vernon,
or 9 miles west of Mechanicsville, moving east at 50 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Mechanicsville around 620 PM CDT.
Stanwood around 625 PM CDT.
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 4196 9150 4196 9137 4195 9136 4194 9097
4176 9101 4186 9151
TIME...MOT...LOC 2307Z 282DEG 44KT 4189 9144
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs2 follow-up statements
544
WWUS53 KDVN 242318
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
618 PM CDT Tue Aug 24 2021
IAC103-242327-
/O.CAN.KDVN.SV.W.0096.000000T0000Z-210824T2345Z/
Johnson IA-
618 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JOHNSON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
east central Iowa.
LAT...LON 4195 9136 4195 9130 4194 9097 4176 9101
4184 9137 4186 9137 4186 9145 4196 9145
4196 9137
TIME...MOT...LOC 2317Z 275DEG 28KT 4189 9134
$$
IAC031-113-242345-
/O.CON.KDVN.SV.W.0096.000000T0000Z-210824T2345Z/
Cedar IA-Linn IA-
618 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHERN CEDAR AND SOUTHEASTERN LINN COUNTIES...
At 617 PM CDT, a severe thunderstorm was located near Lisbon, or near
Mechanicsville, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Mechanicsville around 625 PM CDT.
Other locations in the path of this severe thunderstorm include
Stanwood.
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 4195 9136 4195 9130 4194 9097 4176 9101
4184 9137 4186 9137 4186 9145 4196 9145
4196 9137
TIME...MOT...LOC 2317Z 275DEG 28KT 4189 9134
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gibbs828
WWUS53 KDVN 242339
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
639 PM CDT Tue Aug 24 2021
IAC031-113-242349-
/O.EXP.KDVN.SV.W.0096.000000T0000Z-210824T2345Z/
Cedar IA-Linn IA-
639 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CEDAR AND
SOUTHEASTERN LINN COUNTIES WILL EXPIRE AT 645 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
east central Iowa.
LAT...LON 4195 9136 4195 9130 4194 9097 4176 9101
4184 9137 4186 9137 4186 9145 4196 9145
4196 9137
TIME...MOT...LOC 2339Z 282DEG 44KT 4184 9101
$$
GibbsThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 2:21 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 39 min |
| Aug 24, 2:49 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Jones, Linn | 56 min |
| Aug 24, 3:03 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque | 42 min |
| Aug 24, 3:38 PM CDT | Tornado Warning | DVN | Dubuque | 25 min |
| Aug 24, 3:42 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 48 min |
| Aug 24, 4:07 PM CDT | Special Weather Statement | DVN | Cedar, Clinton, Jackson, Johnson | 23 min |
| Aug 24, 4:17 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson | 58 min |
| Aug 24, 4:54 PM CDT | Special Weather Statement | DVN | Benton | 36 min |
| Aug 24, 5:01 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 59 min |
| Aug 24, 5:05 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa | 40 min |
| Aug 24, 5:23 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 37 min |
| Aug 24, 5:27 PM CDT | Special Weather Statement | DVN | Johnson | 48 min |
| Aug 24, 6:49 PM CDT | Special Weather Statement | DVN | Scott | 41 min |
Nearby
Severe 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.