Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 41, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Dec 15, 2021, 5:15 PM CST for 4 counties in Iowa. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Dec 15, 2021, 5:15 PM CST (23:15 UTC)
- Expired
- Dec 15, 2021, 5:45 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, Carroll County, IA, Crawford County, IA, Sac County, IA
The radar
The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 23:19 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.
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, 11.3 hours before the alert went out and 158 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.
285
WFUS53 KDMX 152315
TORDMX
IAC025-027-047-161-152345-
/O.NEW.KDMX.TO.W.0041.211215T2315Z-211215T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
515 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Southeastern Sac County in west central Iowa...
West central Calhoun County in west central Iowa...
Northeastern Crawford County in west central Iowa...
Northwestern Carroll County in west central Iowa...
* Until 545 PM CST.
* At 515 PM CST, a severe thunderstorm capable of producing a tornado
was located near Black Hawk Lake, or 13 miles south of Sac 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...
Sac City around 525 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 4216 9506 4221 9516 4250 9492 4242 9471
TIME...MOT...LOC 2315Z 215DEG 61KT 4224 9504
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil2 follow-up statements
795
WWUS53 KDMX 152325
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
525 PM CST Wed Dec 15 2021
IAC047-152335-
/O.CAN.KDMX.TO.W.0041.000000T0000Z-211215T2345Z/
Crawford IA-
525 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR NORTHEASTERN CRAWFORD COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area.
A Tornado Watch remains in effect until 800 PM CST for west central
Iowa.
LAT...LON 4220 9501 4233 9505 4250 9492 4242 9471
TIME...MOT...LOC 2325Z 215DEG 61KT 4238 9491
$$
IAC025-027-161-152345-
/O.CON.KDMX.TO.W.0041.000000T0000Z-211215T2345Z/
Sac IA-Calhoun IA-Carroll IA-
525 PM CST Wed Dec 15 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CST FOR
SOUTHEASTERN SAC...WEST CENTRAL CALHOUN AND NORTHWESTERN CARROLL
COUNTIES...
At 525 PM CST, a severe thunderstorm capable of producing a tornado
was located near Sac 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
southeastern Sac, west central Calhoun and northwestern Carroll
Counties, including the following locations... Lytton, Blackhawk Lake
State Park and Sac City Municipal Airport.
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 4220 9501 4233 9505 4250 9492 4242 9471
TIME...MOT...LOC 2325Z 215DEG 61KT 4238 9491
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cogil691
WWUS53 KDMX 152338
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
538 PM CST Wed Dec 15 2021
IAC025-027-161-152348-
/O.EXP.KDMX.TO.W.0041.000000T0000Z-211215T2345Z/
Sac IA-Calhoun IA-Carroll IA-
538 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR SOUTHEASTERN SAC...WEST CENTRAL CALHOUN
AND NORTHWESTERN CARROLL COUNTIES WILL EXPIRE AT 545 PM CST...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 800 PM CST for west central
Iowa.
LAT...LON 4220 9501 4233 9505 4250 9492 4242 9471
TIME...MOT...LOC 2338Z 215DEG 61KT 4255 9475
$$
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, 5:18 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, 5:45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.