Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 34, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Aug 27, 2021, 5:25 PM CDT for Cerro Gordo County, Iowa. It was in force for 35 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
- Aug 27, 2021, 5:25 PM CDT (22:25 UTC)
- Expired
- Aug 27, 2021, 6:00 PM CDT
- In force
- 35 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
County Cerro Gordo County, IA
The radar
The Des Moines radar (KDMX), 145 km from the middle of the area, began a volume at 22:25 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 |
|---|---|---|---|
| Aug 27, 5:27 PM CDT | FUNNEL CLOUD | 3 S Rockwell, IA | FUNNEL CLOUD REPORTED NORTH OF SHEFFIELD. FUNNEL CLOUD WAS LOW, BUT UNCLEAR IF IN CONTACT WITH THE GROUND. |
| Aug 27, 5:42 PM CDT | FUNNEL CLOUD | Dougherty, IA | 2 MILES NW OF DOUGHERTY, NOT SURE WHETHER FUNNEL ACTUALLY TOUCHED GROUND. |
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 |
|---|---|---|---|
| Aug 27, 5:15 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.4 hours before the alert went out and 213 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
- 487 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- -16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
055
WFUS53 KDMX 272225
TORDMX
IAC033-272300-
/O.NEW.KDMX.TO.W.0034.210827T2225Z-210827T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
525 PM CDT Fri Aug 27 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Southeastern Cerro Gordo County in north central Iowa...
* Until 600 PM CDT.
* At 524 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Sheffield, or 13 miles north of Hampton, moving
northeast at 20 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Rockwell around 535 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4291 9303 4291 9328 4301 9331 4306 9302
TIME...MOT...LOC 2224Z 246DEG 18KT 4294 9323
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
REV3 follow-up statements
263
WWUS53 KDMX 272235
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
535 PM CDT Fri Aug 27 2021
IAC033-272300-
/O.CON.KDMX.TO.W.0034.000000T0000Z-210827T2300Z/
Cerro Gordo IA-
535 PM CDT Fri Aug 27 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHEASTERN CERRO GORDO COUNTY...
At 535 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Rockwell, or 12 miles south of Mason City, moving
northeast at 25 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
southeastern Cerro Gordo County, including the following locations...
Dougherty.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4291 9303 4291 9328 4301 9331 4306 9302
TIME...MOT...LOC 2235Z 246DEG 20KT 4297 9311
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
REV972
WWUS53 KDMX 272242
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
542 PM CDT Fri Aug 27 2021
IAC033-272300-
/O.CON.KDMX.TO.W.0034.000000T0000Z-210827T2300Z/
Cerro Gordo IA-
542 PM CDT Fri Aug 27 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHEASTERN CERRO GORDO COUNTY...
At 542 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles east of Rockwell, or 15 miles southeast of Mason
City, moving east at 15 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Dougherty.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4291 9303 4291 9314 4303 9315 4306 9302
TIME...MOT...LOC 2242Z 259DEG 13KT 4295 9305
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
REV759
WWUS53 KDMX 272257
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
557 PM CDT Fri Aug 27 2021
IAC033-272307-
/O.EXP.KDMX.TO.W.0034.000000T0000Z-210827T2300Z/
Cerro Gordo IA-
557 PM CDT Fri Aug 27 2021
...THE TORNADO WARNING FOR SOUTHEASTERN CERRO GORDO COUNTY WILL
EXPIRE AT 600 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1100 PM CDT for north central
Iowa.
LAT...LON 4291 9303 4291 9314 4303 9315 4306 9302
TIME...MOT...LOC 2257Z 246DEG 18KT 4298 9296
$$
REVThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 7:02 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll | 28 min |
| Aug 26, 8:35 PM CDT | Special Weather Statement | DMX | Poweshiek | 40 min |
| Aug 26, 8:47 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 58 min |
| Aug 26, 9:46 PM CDT | Special Weather Statement | DMX | Mahaska | 44 min |
| Aug 26, 10:26 PM CDT | Special Weather Statement | DMX | Mahaska | 34 min |
| Aug 26, 10:30 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 45 min |
| Aug 26, 10:52 PM CDT | Special Weather Statement | DMX | Wapello | 38 min |
| Aug 26, 11:42 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 33 min |
| Aug 27, 12:13 AM CDT | Special Weather Statement | DMX | Emmet | 32 min |
| Aug 27, 2:08 PM CDT | Special Weather Statement | DMX | Hancock | 37 min |
| Aug 27, 2:59 PM CDT | Special Weather Statement | DMX | Cerro Gordo | 16 min |
| Aug 27, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 52 min |
| Aug 27, 4:48 PM CDT | Tornado Warning | DMX | Cerro Gordo, Hancock | 57 min |
| Aug 27, 4:58 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hancock | 32 min |
| Aug 27, 5:23 PM CDT | Tornado Warning | DMX | Cerro Gordo | 37 min |
Nearby
Tornado Warnings in Iowa, 2021Every tornado warning in 2021Tornadoes 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.