Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 75, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 5:49 PM CDT for 4 counties in Iowa. It was in force for 41 min. 5 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
- Jul 14, 2021, 5:49 PM CDT (22:49 UTC)
- Expired
- Jul 14, 2021, 6:30 PM CDT
- In force
- 41 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA, Grundy County, IA
The radar
The Des Moines radar (KDMX), 144 km from the middle of the area, began a volume at 22:50 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 14, 6:17 PM CDT | TSTM WND DMG | Waterloo, IA | NUMEROUS TREES DOWN. TIME ESTIMATED FROM RADAR. |
| Jul 14, 6:19 PM CDT | TORNADO | 1 Nw Waterloo, IA | BRIEF TORNADO REPORTED NEAR THE JOHN DEERE FACILITY WITH DAMAGE REPORTED NEAR US 218. |
| Jul 14, 6:19 PM CDT | TORNADO | 1 Nw Waterloo, IA | DELAYED REPORT - BRIEF TORNADO TOUCHDOWN NEAR JOHN DEERE COMPLEX WITH SOME DAMAGE EITHER SIDE OF US 218. |
| Jul 14, 6:19 PM CDT | TORNADO | 1 Nw Waterloo, IA | DELAYED REPORT: BRIEF TORNADO TOUCHDOWN NEAR JOHN DEERE COMPLEX WITH SOME DAMAGE REPORTED EITHER SIDE OF US 218 FROM MAYNARD & ANSBOROUGH AVE SOUTH TOWARD WESTFILED AVE. |
| Jul 14, 6:22 PM CDT | TSTM WND DMG | Waterloo, IA | TREES DOWN. TIME ESTIMATED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 14, 2:35 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 179 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
- 573 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 1106 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
879
WUUS53 KDMX 142249
SVRDMX
IAC013-017-023-075-142330-
/O.NEW.KDMX.SV.W.0075.210714T2249Z-210714T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
549 PM CDT Wed Jul 14 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Black Hawk County in northeastern Iowa...
Southern Bremer County in northeastern Iowa...
Northeastern Grundy County in central Iowa...
Southeastern Butler County in north central Iowa...
* Until 630 PM CDT.
* At 548 PM CDT, severe thunderstorms were located along a line
extending from near Denver to Waterloo Municipal Airport to Hudson,
moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Waterloo, Cedar Falls, Evansdale, Jesup, Hudson, Dike, Elk Run
Heights, Crossroads Mall, Waterloo Municipal Airport, Uni-Dome And
McLeod Center, Janesville, Washburn, Dunkerton, Raymond,
Gilbertville, New Hartford and George Wyth State Park.
This includes Interstate 380 between mile markers 60 and 73.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for central, north
central and northeastern Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4243 9264 4265 9263 4266 9208 4247 9208
4247 9206 4238 9207
TIME...MOT...LOC 2248Z 251DEG 30KT 4265 9244 4255 9242 4244 9243
HAIL...<.75IN
WIND...60MPH
$$
Fowle1 follow-up statement
031
WWUS53 KDMX 142320
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
620 PM CDT Wed Jul 14 2021
IAC023-142329-
/O.CAN.KDMX.SV.W.0075.000000T0000Z-210714T2330Z/
Butler IA-
620 PM CDT Wed Jul 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUTLER COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area.Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 900 PM CDT for central and
northeastern Iowa.
LAT...LON 4242 9257 4251 9248 4266 9234 4266 9208
4247 9208 4247 9206 4238 9207
TIME...MOT...LOC 2319Z 269DEG 28KT 4265 9222 4256 9225 4245 9241
$$
IAC013-017-075-142330-
/O.CON.KDMX.SV.W.0075.000000T0000Z-210714T2330Z/
Black Hawk IA-Bremer IA-Grundy IA-
620 PM CDT Wed Jul 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR CENTRAL BLACK HAWK...SOUTHEASTERN BREMER AND EAST CENTRAL GRUNDY
COUNTIES...
At 619 PM CDT, severe thunderstorms were located along a line
extending from near Denver to 6 miles north of Elk Run Heights to
near Hudson, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Waterloo, Cedar Falls, Evansdale, Jesup, Hudson, Denver, Elk Run
Heights, Crossroads Mall, Waterloo Municipal Airport, Uni-Dome And
McLeod Center, Washburn, Dunkerton, Raymond, Gilbertville and George
Wyth State Park.
This includes Interstate 380 between mile markers 60 and 73.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for central and
northeastern Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4242 9257 4251 9248 4266 9234 4266 9208
4247 9208 4247 9206 4238 9207
TIME...MOT...LOC 2319Z 269DEG 28KT 4265 9222 4256 9225 4245 9241
HAIL...<.75IN
WIND...60MPH
$$
FowleThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 7:17 AM CDT | Special Weather Statement | DMX | Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas | 58 min |
| Jul 14, 8:08 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Winnebago | 52 min |
| Jul 14, 8:24 AM CDT | Special Weather Statement | DMX | Butler, Cerro Gordo, Franklin, Hancock, Winnebago, Worth | 66 min |
| Jul 14, 8:39 AM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin, Grundy, Hancock, Hardin and 1 more | 66 min |
| Jul 14, 8:43 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 62 min |
| Jul 14, 8:49 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Story, Tama | 56 min |
| Jul 14, 9:40 AM CDT | Special Weather Statement | DMX | Black Hawk, Bremer, Tama | 65 min |
| Jul 14, 3:55 PM CDT | Tornado Warning | DMX | Calhoun, Carroll, Greene | 35 min |
| Jul 14, 4:04 PM CDT | Tornado Warning | DMX | Boone, Hamilton, Story, Webster | 41 min |
| Jul 14, 4:23 PM CDT | Tornado Warning | DMX | Franklin, Hamilton, Hardin, Wright | 37 min |
| Jul 14, 4:29 PM CDT | Tornado Warning | DMX | Calhoun, Greene, Webster | 31 min |
| Jul 14, 4:29 PM CDT | Tornado Warning | DMX | Hamilton, Hardin | 31 min |
| Jul 14, 4:30 PM CDT | Tornado Warning | DMX | Butler | 30 min |
| Jul 14, 4:35 PM CDT | Tornado Warning | DMX | Franklin, Hardin | 40 min |
| Jul 14, 4:53 PM CDT | Tornado Warning | DMX | Bremer, Butler | 37 min |
| Jul 14, 4:56 PM CDT | Tornado Warning | DMX | Hamilton, Hardin | 25 min |
| Jul 14, 5:00 PM CDT | Tornado Warning | DMX | Hamilton, Hardin, Story | 25 min |
| Jul 14, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler | 42 min |
| Jul 14, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin | 42 min |
| Jul 14, 5:23 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer, Butler | 37 min |
| Jul 14, 5:50 PM CDT | Tornado Warning | DMX | Cerro Gordo | 25 min |
| Jul 14, 5:53 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer | 37 min |
| Jul 14, 5:58 PM CDT | Tornado Warning | DMX | Calhoun | 47 min |
| Jul 14, 6:02 PM CDT | Tornado Warning | DMX | Black Hawk, Grundy, Marshall, Tama | 43 min |
| Jul 14, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 48 min |
| Jul 14, 6:42 PM CDT | Tornado Warning | DMX | Webster | 36 min |
| Jul 14, 6:55 PM CDT | Tornado Warning | DMX | Tama | 19 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.