Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 43, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Dec 15, 2021, 5:36 PM CST for 5 counties in Iowa. It was in force for 24 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
- Dec 15, 2021, 5:36 PM CST (23:36 UTC)
- Expired
- Dec 15, 2021, 6:00 PM CST
- In force
- 24 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Calhoun County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA
The radar
The Des Moines radar (KDMX), 129 km from the middle of the area, began a volume at 23:41 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 |
|---|---|---|---|
| Dec 15, 6:00 PM CST | TORNADO | Bradgate, IA | PUBLIC REPORTED TORNADO ON THE GROUND. NO ADDITIONAL INFORMATION AT THIS TIME. |
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 |
|---|---|---|---|
| Dec 15, 1:23 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.6 hours before the alert went out and 203 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
- 2165 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 346 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
045
WFUS53 KDMX 152336
TORDMX
IAC025-091-109-147-151-160000-
/O.NEW.KDMX.TO.W.0043.211215T2336Z-211216T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
536 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Pocahontas County in northwestern Iowa...
Southwestern Kossuth County in north central Iowa...
Northwestern Calhoun County in west central Iowa...
Northwestern Humboldt County in north central Iowa...
Southeastern Palo Alto County in northwestern Iowa...
* Until 600 PM CST.
* At 536 PM CST, a severe thunderstorm capable of producing a tornado
was located 8 miles northwest of South Twin Lake, or 12 miles
northwest of Rockwell City, moving northeast at 70 mph.
HAZARD...Tornado.
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...
Pocahontas around 550 PM CST.
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 4246 9477 4249 9490 4291 9472 4291 9425
TIME...MOT...LOC 2336Z 211DEG 63KT 4253 9479
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil2 follow-up statements
847
WWUS53 KDMX 152341
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
541 PM CST Wed Dec 15 2021
IAC025-152350-
/O.CAN.KDMX.TO.W.0043.000000T0000Z-211216T0000Z/
Calhoun IA-
541 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR NORTHWESTERN CALHOUN COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CST for north central
and northwestern Iowa.
LAT...LON 4256 9466 4257 9486 4291 9472 4291 9425
TIME...MOT...LOC 2340Z 211DEG 63KT 4260 9473
$$
IAC091-109-147-151-160000-
/O.CON.KDMX.TO.W.0043.000000T0000Z-211216T0000Z/
Pocahontas IA-Kossuth IA-Humboldt IA-Palo Alto IA-
541 PM CST Wed Dec 15 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CST FOR
POCAHONTAS...SOUTHWESTERN KOSSUTH...NORTHWESTERN HUMBOLDT AND
SOUTHEASTERN PALO ALTO COUNTIES...
At 540 PM CST, a severe thunderstorm capable of producing a tornado
was located 9 miles northwest of North Twin Lake, or 9 miles south of
Pocahontas, moving northeast at 70 mph.
HAZARD...Tornado.
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...
Pocahontas around 550 PM CST.
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 4256 9466 4257 9486 4291 9472 4291 9425
TIME...MOT...LOC 2340Z 211DEG 63KT 4260 9473
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil183
WWUS53 KDMX 152359
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
559 PM CST Wed Dec 15 2021
IAC091-109-147-151-160008-
/O.EXP.KDMX.TO.W.0043.000000T0000Z-211216T0000Z/
Pocahontas IA-Kossuth IA-Humboldt IA-Palo Alto IA-
559 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR POCAHONTAS...SOUTHWESTERN KOSSUTH...
NORTHWESTERN HUMBOLDT AND SOUTHEASTERN PALO ALTO COUNTIES WILL EXPIRE
AT 600 PM CST...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 800 PM CST for north central
and northwestern Iowa.
LAT...LON 4256 9466 4257 9486 4291 9472 4291 9425
TIME...MOT...LOC 2358Z 211DEG 63KT 4287 9451
$$
CogilThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 4:13 PM CST | Severe Thunderstorm Warning | DMX | Adair, Adams, Audubon, Cass, Guthrie, Ringgold and 2 more | 77 min |
| Dec 15, 4:16 PM CST | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 74 min |
| Dec 15, 4:37 PM CST | Tornado Warning | DMX | Cass | 23 min |
| Dec 15, 4:44 PM CST | Tornado Warning | DMX | Crawford | 36 min |
| Dec 15, 4:53 PM CST | Tornado Warning | DMX | Adair, Audubon, Cass, Guthrie | 33 min |
| Dec 15, 5:07 PM CST | Tornado Warning | DMX | Sac | 27 min |
| Dec 15, 5:10 PM CST | Severe Thunderstorm Warning | DMX | Adair, Audubon, Boone, Dallas, Greene, Guthrie and 4 more | 80 min |
| Dec 15, 5:10 PM CST | Tornado Warning | DMX | Carroll, Crawford | 35 min |
| Dec 15, 5:14 PM CST | Tornado Warning | DMX | Audubon, Calhoun, Carroll, Greene, Guthrie | 31 min |
| Dec 15, 5:15 PM CST | Tornado Warning | DMX | Calhoun, Carroll, Crawford, Sac | 30 min |
| Dec 15, 5:18 PM CST | Tornado Warning | DMX | Adair, Boone, Dallas, Greene, Guthrie | 42 min |
| Dec 15, 5:19 PM CST | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Carroll, Emmet, Greene, Humboldt and 5 more | 71 min |
| Dec 15, 5:22 PM CST | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 23 min |
| Dec 15, 5:22 PM CST | Severe Thunderstorm Warning | DMX | Adair, Adams, Clarke, Decatur, Madison, Ringgold and 3 more | 68 min |
| Dec 15, 5:38 PM CST | Tornado Warning | DMX | Boone, Calhoun, Greene, Hamilton, Webster | 37 min |
| Dec 15, 5:45 PM CST | Tornado Warning | DMX | Calhoun, Pocahontas, Webster | 30 min |
| Dec 15, 5:52 PM CST | Severe Thunderstorm Warning | DMX | Boone, Franklin, Hamilton, Hancock, Hardin, Humboldt and 6 more | 53 min |
| Dec 15, 5:58 PM CST | Tornado Warning | DMX | Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas | 32 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.