Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 61, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 28, 2021, 12:50 AM CDT for Buchanan County, Delaware County, Iowa. It was in force for 40 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
- Jul 28, 2021, 12:50 AM CDT (05:50 UTC)
- Expired
- Jul 28, 2021, 1:30 AM CDT
- In force
- 40 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Buchanan County, IA, Delaware County, IA
The radar
The Quad Cities radar (KDVN), 126 km from the middle of the area, began a volume at 05:54 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 |
|---|---|---|---|
| Jul 27, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 5.8 hours before the alert went out and 129 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
- 1554 J/kg
- Mixed-layer CIN
- -284 J/kg
- Mixed-layer LCL
- 1342 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
377
WUUS53 KDVN 280550
SVRDVN
IAC019-055-280630-
/O.NEW.KDVN.SV.W.0061.210728T0550Z-210728T0630Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1250 AM CDT Wed Jul 28 2021
The National Weather Service in the Quad Cities has issued a
* Severe Thunderstorm Warning for...
Eastern Buchanan County in northeastern Iowa...
Delaware County in northeastern Iowa...
* Until 130 AM CDT.
* At 1249 AM CDT, a severe thunderstorm was located near Aurora, or
11 miles northeast of Independence, moving southeast at 45 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...
Dundee and Masonville around 100 AM CDT.
Manchester around 105 AM CDT.
Other locations in the path of this severe thunderstorm include
Delhi, Ryan, Delaware and Hopkinton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 9148 4236 9113 4230 9113 4230 9170
4259 9194 4264 9187
TIME...MOT...LOC 0549Z 311DEG 41KT 4257 9172
HAIL...1.00IN
WIND...60MPH
$$
RP Kinney2 follow-up statements
056
WWUS53 KDVN 280614
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
114 AM CDT Wed Jul 28 2021
IAC019-055-280630-
/O.CON.KDVN.SV.W.0061.000000T0000Z-210728T0630Z/
Buchanan IA-Delaware IA-
114 AM CDT Wed Jul 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR SOUTHEASTERN BUCHANAN AND DELAWARE COUNTIES...
At 113 AM CDT, a severe thunderstorm was located over Masonville, or
near Manchester, moving southeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Public.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Manchester, Delhi, Ryan, Delaware and Hopkinton.
At 1250 am CST, a public weather station just north of Aurora
reported a wind gust of 63 mph.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
sturdy building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4263 9148 4236 9113 4230 9113 4230 9170
4251 9184
TIME...MOT...LOC 0613Z 309DEG 34KT 4249 9157
HAIL...0.75IN
WIND...60MPH
$$
RP Kinney829
WWUS53 KDVN 280626
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
126 AM CDT Wed Jul 28 2021
IAC019-055-280635-
/O.EXP.KDVN.SV.W.0061.000000T0000Z-210728T0630Z/
Buchanan IA-Delaware IA-
126 AM CDT Wed Jul 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUCHANAN AND
DELAWARE COUNTIES WILL EXPIRE AT 130 AM 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 small
hail and gusty winds to 40 mph are still possible from Quasqueton,
to Robinson and Ryan through 2 am.
A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Iowa.
LAT...LON 4263 9148 4236 9113 4230 9113 4230 9170
4251 9184
TIME...MOT...LOC 0625Z 316DEG 40KT 4236 9155
$$
RP KinneyThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 12:28 AM CDT | Special Weather Statement | DVN | Buchanan | 47 min |
| Jul 28, 1:29 AM CDT | Special Weather Statement | DVN | Linn | 31 min |
| Jul 28, 1:52 AM CDT | Special Weather Statement | DVN | Dubuque | 38 min |
| Jul 28, 2:37 AM CDT | Special Weather Statement | DVN | Jackson | 38 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.