Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 42, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Dec 15, 2021, 5:18 PM CST for 5 counties in Iowa. It was in force for 42 min. 5 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
- Dec 15, 2021, 5:18 PM CST (23:18 UTC)
- Expired
- Dec 15, 2021, 6:00 PM CST
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.75 in
Counties Adair County, IA, Boone County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA
The radar
The Des Moines radar (KDMX), 55 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 15, 5:25 PM CST | TSTM WND GST 73 | 4 Ne Guthrie Center, IA | |
| Dec 15, 5:32 PM CST | TSTM WND DMG | Yale, IA | REPORT OF AN OUTBUILDING DESTROYED. |
| Dec 15, 5:39 PM CST | TSTM WND DMG | Grand Junction, IA | PUBLIC RELAYED SIDING MISSING ON HOUSE ON SE SIDE OF GRAND JUNCTION. TIME ESTIMATED FROM RADAR. |
| Dec 15, 5:41 PM CST | TSTM WND GST 70 | Perry, IA | 60 TO 70 MPH WIND GUST REPORTS FROM AMATEUR RADIO OPERATORS IN PERRY. |
| Dec 15, 5:45 PM CST | TSTM WND GST 74 | 3 Ese Dawson, IA | DIALED INTO PERRY AWOS. |
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, 11.3 hours before the alert went out and 172 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.
958
WFUS53 KDMX 152318
TORDMX
IAC001-015-049-073-077-160000-
/O.NEW.KDMX.TO.W.0042.211215T2318Z-211216T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
518 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Tornado Warning for...
Southeastern Greene County in west central Iowa...
Central Guthrie County in west central Iowa...
Southwestern Boone County in central Iowa...
Northwestern Dallas County in central Iowa...
Northwestern Adair County in southwestern Iowa...
* Until 600 PM CST.
* At 518 PM CST, a tornado producing storm was located 7 miles
northwest of Guthrie Center, moving northeast at 85 mph.
HAZARD...Damaging tornado.
SOURCE...Radar confirmed tornado.
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 Greene, central Guthrie, southwestern Boone,
northwestern Dallas and northwestern Adair Counties, including the
following locations... Dawson, Rippey, Perry Municipal Airport,
Grand Junction, Yale, Beaver, Berkley, Jamaica, Springbrook State
Park and Lakin Slough Game Management Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. 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 4150 9455 4168 9470 4212 9421 4192 9391
TIME...MOT...LOC 2318Z 215DEG 74KT 4175 9459
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
Martin1 follow-up statement
956
WWUS53 KDMX 152333
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
533 PM CST Wed Dec 15 2021
IAC001-152343-
/O.CAN.KDMX.TO.W.0042.000000T0000Z-211216T0000Z/
Adair IA-
533 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR NORTHWESTERN ADAIR COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CST for central and
west central Iowa.
LAT...LON 4161 9438 4176 9461 4212 9421 4192 9391
TIME...MOT...LOC 2333Z 224DEG 64KT 4192 9433
$$
IAC015-049-073-077-160000-
/O.CON.KDMX.TO.W.0042.000000T0000Z-211216T0000Z/
Greene IA-Guthrie IA-Boone IA-Dallas IA-
533 PM CST Wed Dec 15 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CST FOR
SOUTHEASTERN GREENE...NORTHEASTERN GUTHRIE...SOUTHWESTERN BOONE AND
NORTHWESTERN DALLAS COUNTIES...
At 533 PM CST, a confirmed tornado was located 7 miles south of
Jefferson, moving northeast at 75 mph.
HAZARD...Damaging tornado.
SOURCE...Radar confirmed tornado.
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...
Perry, Guthrie Center, Panora, Lake Panorama, Grand Junction, Bagley,
Rippey, Yale, Jamaica, Dawson, Bouton, Beaver, Berkley, Perry
Municipal Airport, Lakin Slough Game Management Area and Springbrook
State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. 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 4161 9438 4176 9461 4212 9421 4192 9391
TIME...MOT...LOC 2333Z 224DEG 64KT 4192 9433
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
MartinThe 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, 5:19 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.