Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 3, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jun 20, 2021, 6:37 PM CDT for Mahaska County, Marion County, Iowa. It was in force for 23 min. 1 report 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
- Jun 20, 2021, 6:37 PM CDT (23:37 UTC)
- Expired
- Jun 20, 2021, 7:00 PM CDT
- In force
- 23 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
Counties Mahaska County, IA, Marion County, IA
The radar
The Des Moines radar (KDMX), 74 km from the middle of the area, began a volume at 23:37 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 |
|---|---|---|---|
| Jun 20, 6:43 PM CDT | TORNADO | 2 Nnw Pella, IA | PICTURE ON SOCIAL MEDIA. |
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 |
|---|---|---|---|
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 205 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2060 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
787
WFUS53 KDMX 202337
TORDMX
IAC123-125-210000-
/O.NEW.KDMX.TO.W.0003.210620T2337Z-210621T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
637 PM CDT Sun Jun 20 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Northeastern Marion County in south central Iowa...
Northwestern Mahaska County in south central Iowa...
* Until 700 PM CDT.
* At 637 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Pella, moving east 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 dangerous storm will be near...
Pella around 640 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.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .
&&
LAT...LON 4141 9306 4148 9302 4144 9276 4132 9281
TIME...MOT...LOC 2337Z 285DEG 20KT 4143 9296
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
REV3 follow-up statements
781
WWUS53 KDMX 202342
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
642 PM CDT Sun Jun 20 2021
IAC123-125-210000-
/O.CON.KDMX.TO.W.0003.000000T0000Z-210621T0000Z/
Marion IA-Mahaska IA-
642 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHEASTERN MARION AND NORTHWESTERN MAHASKA COUNTIES...
At 641 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Pella, moving east at 25 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Weather spotters reported a funnel cloud 2 WNW Pella at
6:39 pm.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
northeastern Marion and northwestern Mahaska Counties, including the
following locations... Pella Municipal Airport and Elk Rock State
Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.
&&
LAT...LON 4141 9306 4148 9302 4144 9276 4132 9281
TIME...MOT...LOC 2341Z 285DEG 20KT 4142 9292
TORNADO...RADAR INDICATED
HAIL...1.00IN
$$
REV313
WWUS53 KDMX 202345
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
645 PM CDT Sun Jun 20 2021
IAC123-125-210000-
/O.CON.KDMX.TO.W.0003.000000T0000Z-210621T0000Z/
Marion IA-Mahaska IA-
645 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHEASTERN MARION AND NORTHWESTERN MAHASKA COUNTIES...
At 645 PM CDT, a confirmed large and extremely dangerous tornado was
located over Pella, moving east at 25 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes
will be destroyed. Considerable damage to homes,
businesses, and vehicles is likely and complete destruction
is possible.
Locations impacted include...
Pella, Lake Red Rock, Pella Municipal Airport and Elk Rock State
Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, 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.
If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.
&&
LAT...LON 4141 9306 4148 9302 4144 9276 4132 9281
TIME...MOT...LOC 2345Z 285DEG 20KT 4141 9289
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN
$$
REV318
WWUS53 KDMX 202352
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
652 PM CDT Sun Jun 20 2021
IAC123-125-210000-
/O.CON.KDMX.TO.W.0003.000000T0000Z-210621T0000Z/
Marion IA-Mahaska IA-
652 PM CDT Sun Jun 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHEASTERN MARION AND NORTHWESTERN MAHASKA COUNTIES...
At 652 PM CDT, a confirmed large and extremely dangerous tornado was
located near Pella, moving east at 30 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes
will be destroyed. Considerable damage to homes,
businesses, and vehicles is likely and complete destruction
is possible.
Locations impacted include...
Pella, Lake Red Rock and Pella Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.
&&
LAT...LON 4139 9300 4147 9298 4144 9276 4132 9281
TIME...MOT...LOC 2352Z 285DEG 26KT 4140 9286
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN
$$
REVThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 3:38 PM CDT | Special Weather Statement | DMX | Dallas | 37 min |
| Jun 20, 4:20 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union | 55 min |
| Jun 20, 4:47 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 43 min |
| Jun 20, 4:53 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 52 min |
| Jun 20, 4:54 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler, Franklin | 51 min |
| Jun 20, 5:33 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Poweshiek | 42 min |
| Jun 20, 5:35 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 40 min |
| Jun 20, 5:55 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion | 50 min |
| Jun 20, 5:59 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 46 min |
| Jun 20, 6:04 PM CDT | Tornado Warning | DMX | Decatur | 26 min |
| Jun 20, 6:13 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 62 min |
| Jun 20, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 30 min |
| Jun 20, 6:20 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 55 min |
| Jun 20, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 47 min |
| Jun 20, 6:59 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 31 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.