Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 5:18 PM CDT for Black Hawk County, Bremer County, Butler County, Iowa. It was in force for 42 min. 10 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, 5:18 PM CDT (22:18 UTC)
- Expired
- Jul 14, 2021, 6:00 PM CDT
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA
The radar
The Des Moines radar (KDMX), 153 km from the middle of the area, began a volume at 22:20 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, 5:18 PM CDT | TORNADO | 1 Ne Shell Rock, IA | KGAN METEOROLOGIST REPORTS TORNADO NEAR SHELL ROCK. |
| Jul 14, 5:19 PM CDT | TORNADO | 1 E Shell Rock, IA | NO DAMAGE SEEN YET. |
| Jul 14, 5:19 PM CDT | TORNADO | 2 S Shell Rock, IA | DAMAGE TO TREES AND A HOME NEAR 250TH AND WOODS AVE. REPORT COURTESY IOWAS NEWS NOW. TIME ESTIMATED BY RADAR. |
| Jul 14, 5:21 PM CDT | TORNADO | 2 Ene Shell Rock, IA | REPORT VIA SOCIAL MEDIA. PHOTOS AND VIDEOS REPORTED. |
| Jul 14, 5:25 PM CDT | TORNADO | 2 Sw Waverly, IA | TORNADO REPORTED NEAR THE INTERSECTION OF 240TH ST AND HWY 218. TORNADO HEADING EAST. |
| Jul 14, 5:28 PM CDT | TORNADO | 1 S Shell Rock, IA | SIGNIFICANT TREE DAMAGE AND LIGHT STRUCTURE DAMAGE. |
| Jul 14, 5:35 PM CDT | TORNADO | 2 S Waverly, IA | TORNADO ON THE GROUND. DEBRIS BEING LOFTED INTO THE AIR. |
| Jul 14, 5:35 PM CDT | TORNADO | 3 Ese Waverly, IA | HOUSE COMPLETELY DESTROYED. |
| Jul 14, 5:37 PM CDT | TORNADO | 2 S Waverly, IA | REPORT VIA SOCIAL MEDIA. |
| Jul 14, 5:39 PM CDT | TORNADO | 4 Wnw Denver, IA | TORNADO ON THE GROUND. DEBRIS BEING LOFTED INTO THE AIR. |
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, 10.3 hours before the alert went out and 200 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.
330
WUUS53 KDMX 142218
SVRDMX
IAC013-017-023-142300-
/O.NEW.KDMX.SV.W.0073.210714T2218Z-210714T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
518 PM CDT Wed Jul 14 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
North central Black Hawk County in northeastern Iowa...
Bremer County in northeastern Iowa...
East central Butler County in north central Iowa...
* Until 600 PM CDT.
* At 518 PM CDT, a severe thunderstorm was located near Shell Rock,
or near Waverly, moving east at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Trained weather spotters reported half-dollar size hail
in Clarkesville at 513 PM.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Waverly around 525 PM CDT.
Other locations in the path of this severe thunderstorm include
Denver and Tripoli.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for north central
and northeastern Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4266 9260 4281 9262 4289 9214 4257 9217
TIME...MOT...LOC 2218Z 271DEG 26KT 4274 9254
TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
$$
KrullThe 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 | Grundy, Hardin | 42 min |
| Jul 14, 5:23 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer, Butler | 37 min |
| Jul 14, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy | 41 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.