Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 45, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Dec 15, 2021, 5:45 PM CST for Calhoun County, Pocahontas County, Webster County, Iowa. It was in force for 30 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, 5:45 PM CST (23:45 UTC)
- Expired
- Dec 15, 2021, 6:15 PM CST
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Calhoun County, IA, Pocahontas County, IA, Webster County, IA
The radar
The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 23:48 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, 5:48 PM CST | TSTM WND DMG | Knierim, IA | MACHINE SHED DAMAGED 1 MILE NORTH OF SOMERS AND STOP SIGNS/HIGHWAY SIGNS BLOWN OVER HWY 20 AT KNIERIM. |
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, 11.8 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
- 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.
360
WFUS53 KDMX 152345
TORDMX
IAC025-151-187-160015-
/O.NEW.KDMX.TO.W.0045.211215T2345Z-211216T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
545 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Northwestern Webster County in central Iowa...
Southeastern Pocahontas County in northwestern Iowa...
Northeastern Calhoun County in west central Iowa...
* Until 615 PM CST.
* At 544 PM CST, a severe thunderstorm capable of producing a tornado
was located 8 miles east 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 tornadic thunderstorm will remain over mainly rural areas of
northwestern Webster, southeastern Pocahontas and northeastern
Calhoun Counties, including the following locations... Knierim,
Clare, Rinard, Barnum and Somers.
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 4264 9448 4265 9431 4265 9423 4264 9422
4230 9450 4235 9461
TIME...MOT...LOC 2344Z 210DEG 62KT 4240 9447
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil2 follow-up statements
589
WWUS53 KDMX 160000 RRA
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
600 PM CST Wed Dec 15 2021
IAC025-151-160010-
/O.CAN.KDMX.TO.W.0045.000000T0000Z-211216T0015Z/
Pocahontas IA-Calhoun IA-
600 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR SOUTHEASTERN POCAHONTAS AND NORTHEASTERN
CALHOUN COUNTIES IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
LAT...LON 4265 9431 4265 9423 4264 9422 4246 9439
4257 9438 4264 9440
TIME...MOT...LOC 0000Z 213DEG 50KT 4260 9431
$$
IAC187-160015-
/O.CON.KDMX.TO.W.0045.000000T0000Z-211216T0015Z/
Webster IA-
600 PM CST Wed Dec 15 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CST FOR
NORTHWESTERN WEBSTER COUNTY...
At 600 PM CST, a severe thunderstorm capable of producing a tornado
was located near Fort Dodge Regional Airport, or 9 miles northwest of
Fort Dodge, moving northeast at 55 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.
Locations impacted include...
Barnum and Clare.
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 4265 9431 4265 9423 4264 9422 4246 9439
4257 9438 4264 9440
TIME...MOT...LOC 0000Z 213DEG 50KT 4260 9431
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil683
WWUS53 KDMX 160009
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
609 PM CST Wed Dec 15 2021
IAC187-160019-
/O.EXP.KDMX.TO.W.0045.000000T0000Z-211216T0015Z/
Webster IA-
609 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR NORTHWESTERN WEBSTER COUNTY WILL EXPIRE AT
615 PM CST...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
LAT...LON 4265 9431 4265 9423 4264 9422 4246 9439
4257 9438 4264 9440
TIME...MOT...LOC 0009Z 210DEG 62KT 4273 9421
$$
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, 5:36 PM CST | Tornado Warning | DMX | Calhoun, Humboldt, Kossuth, Palo Alto, Pocahontas | 24 min |
| Dec 15, 5:38 PM CST | Tornado Warning | DMX | Boone, Calhoun, Greene, Hamilton, Webster | 37 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.