Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 76, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 14, 2021, 6:42 PM CDT for Tama County, Iowa. It was in force for 48 min. 2 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, 6:42 PM CDT (23:42 UTC)
- Expired
- Jul 14, 2021, 7:30 PM CDT
- In force
- 48 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Tama County, IA
The radar
The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 23:43 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, 7:05 PM CDT | TORNADO | Dysart, IA | STRUCTURAL DAMAGE TO BUILDINGS. TIME ESTIMATED FROM RADAR. |
| Jul 14, 7:24 PM CDT | TSTM WND DMG | Dysart, IA | DYSART FIRE CALLED OUT FOR A DOWNED TRANSFORMER THAT STARTED A FIRE. |
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, 11.7 hours before the alert went out and 181 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.
380 WUUS53 KDMX 142342 SVRDMX IAC171-150030- /O.NEW.KDMX.SV.W.0076.210714T2342Z-210715T0030Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Des Moines IA 642 PM CDT Wed Jul 14 2021 The National Weather Service in Des Moines has issued a * Severe Thunderstorm Warning for... Northern Tama County in central Iowa... * Until 730 PM CDT. * At 642 PM CDT, a severe thunderstorm was located near Traer, or 11 miles north of Toledo, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Traer, Dysart, Gladbrook, Garwin, Clutier, Tf Clark State Park and Union Grove State Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 900 PM CDT for central Iowa. Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4201 9276 4222 9277 4229 9230 4206 9230 TIME...MOT...LOC 2342Z 268DEG 27KT 4215 9253 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ Fowle
The 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, 5:49 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 | 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.