Alert archive / Iowa / Tornado Warnings in 2021
Tornado Warning 23, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Dec 15, 2021, 4:16 PM CST for Washington County, Nebraska; Harrison County, Pottawattamie County, Iowa. It was in force for 17 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, 4:16 PM CST (22:16 UTC)
- Expired
- Dec 15, 2021, 4:33 PM CST
- In force
- 17 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Harrison County, IA, Pottawattamie County, IA, Washington County, NE
The radar
The Omaha radar (KOAX), 44 km from the middle of the area, began a volume at 22:15 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, 4:22 PM CST | TSTM WND GST 58 | 2 W Missouri Valley, IA | MESONET STATION UP118 2.2 W MISSOURI VALLEY (UPR). |
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, 10.3 hours before the alert went out and 44 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.
401
WFUS53 KOAX 152216
TOROAX
IAC085-155-NEC177-152245-
/O.NEW.KOAX.TO.W.0023.211215T2216Z-211215T2245Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Omaha/Valley Nebraska
416 PM CST Wed Dec 15 2021
The National Weather Service in Omaha has issued a
* Tornado Warning for...
Northwestern Pottawattamie County in southwestern Iowa...
Western Harrison County in southwestern Iowa...
Eastern Washington County in east central Nebraska...
* Until 445 PM CST.
* At 415 PM CST, a severe thunderstorm capable of producing a tornado
was located near Blair, or 19 miles north of Omaha, moving
northeast at 75 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...
Missouri Valley and Modale around 420 PM CST.
Mondamin around 425 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 4143 9600 4151 9621 4170 9610 4170 9607
4172 9609 4181 9604 4174 9575
TIME...MOT...LOC 2215Z 207DEG 64KT 4154 9606
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Kern2 follow-up statements
207
WWUS53 KOAX 152218
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
418 PM CST Wed Dec 15 2021
IAC155-152228-
/O.CAN.KOAX.TO.W.0023.000000T0000Z-211215T2245Z/
Pottawattamie IA-
418 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR NORTHWESTERN POTTAWATTAMIE COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CST for southwestern
Iowa...and east central Nebraska.
LAT...LON 4151 9595 4151 9599 4157 9611 4170 9610
4170 9607 4172 9609 4181 9604 4174 9575
TIME...MOT...LOC 2218Z 206DEG 62KT 4158 9604
$$
IAC085-NEC177-152245-
/O.CON.KOAX.TO.W.0023.000000T0000Z-211215T2245Z/
Harrison IA-Washington NE-
418 PM CST Wed Dec 15 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CST FOR WESTERN
HARRISON AND NORTHEASTERN WASHINGTON COUNTIES...
At 418 PM CST, a severe thunderstorm capable of producing a tornado
was located near Modale, or 21 miles north of Omaha, 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...
Mondamin around 425 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 4151 9595 4151 9599 4157 9611 4170 9610
4170 9607 4172 9609 4181 9604 4174 9575
TIME...MOT...LOC 2218Z 206DEG 62KT 4158 9604
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Kern813
WWUS53 KOAX 152233
SVSOAX
Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
433 PM CST Wed Dec 15 2021
IAC085-NEC177-152243-
/O.CAN.KOAX.TO.W.0023.000000T0000Z-211215T2245Z/
Harrison IA-Washington NE-
433 PM CST Wed Dec 15 2021
...THE TORNADO WARNING FOR WESTERN HARRISON AND NORTHEASTERN
WASHINGTON COUNTIES IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However gusty winds are
still possible with this thunderstorm.
A Tornado Watch remains in effect until 800 PM CST for southwestern
Iowa...and east central Nebraska.
LAT...LON 4151 9595 4151 9599 4157 9611 4170 9610
4170 9607 4172 9609 4181 9604 4174 9575
TIME...MOT...LOC 2232Z 207DEG 64KT 4182 9588
$$
KernThe office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 2:19 PM CST | Severe Thunderstorm Warning | OAX | Antelope, Boone, Butler, Colfax, Madison, Pierce and 2 more | 56 min |
| Dec 15, 2:26 PM CST | Severe Thunderstorm Warning | OAX | Butler, Gage, Jefferson, Lancaster, Saline, Saunders and 1 more | 64 min |
| Dec 15, 2:39 PM CST | Tornado Warning | OAX | Boone, Madison, Platte, Stanton | 24 min |
| Dec 15, 2:50 PM CST | Tornado Warning | OAX | Colfax, Platte | 40 min |
| Dec 15, 2:54 PM CST | Severe Thunderstorm Warning | OAX | Cass, Dodge, Douglas, Gage, Johnson, Lancaster and 5 more | 81 min |
| Dec 15, 2:59 PM CST | Tornado Warning | OAX | Butler, Colfax, Dodge, Platte | 31 min |
| Dec 15, 3:06 PM CST | Tornado Warning | OAX | Madison, Platte, Stanton | 24 min |
| Dec 15, 3:09 PM CST | Severe Thunderstorm Warning | OAX | Burt, Butler, Colfax, Cuming, Dodge, Saunders and 4 more | 51 min |
| Dec 15, 3:13 PM CST | Severe Thunderstorm Warning | OAX | Antelope, Cedar, Colfax, Knox, Madison, Pierce and 3 more | 62 min |
| Dec 15, 3:23 PM CST | Tornado Warning | OAX | Lancaster, Seward | 16 min |
| Dec 15, 3:25 PM CST | Tornado Warning | OAX | Colfax, Cuming, Stanton | 35 min |
| Dec 15, 3:29 PM CST | Tornado Warning | OAX | Madison, Stanton, Wayne | 31 min |
| Dec 15, 3:35 PM CST | Severe Thunderstorm Warning | OAX | Cass, Douglas, Johnson, Nemaha, Otoe, Pawnee and 3 more | 70 min |
| Dec 15, 3:41 PM CST | Severe Thunderstorm Warning | OAX | Burt, Cuming, Thurston, Washington | 64 min |
| Dec 15, 3:45 PM CST | Tornado Warning | OAX | Douglas, Saunders | 30 min |
| Dec 15, 3:45 PM CST | Tornado Warning | OAX | Cuming, Thurston | 45 min |
| Dec 15, 3:54 PM CST | Tornado Warning | OAX | Dodge, Douglas, Washington | 28 min |
| Dec 15, 4:01 PM CST | Tornado Warning | OAX | Cass, Otoe | 14 min |
| Dec 15, 4:11 PM CST | Tornado Warning | OAX | Nemaha, Pawnee, Richardson | 34 min |
| Dec 15, 4:12 PM CST | Tornado Warning | OAX | Cass | 33 min |
| Dec 15, 5:08 PM CST | Blowing Dust Advisory | OAX | Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 5 more | 4 hr |
| Dec 15, 3:55 PM CST | Severe Thunderstorm Warning | OAX | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 80 min |
| Dec 15, 4:21 PM CST | Tornado Warning | OAX | Pottawattamie | 24 min |
| Dec 15, 4:30 PM CST | Tornado Warning | OAX | Mills, Montgomery, Pottawattamie | 30 min |
| Dec 15, 4:31 PM CST | Tornado Warning | OAX | Harrison, Monona, Shelby | 13 min |
| Dec 15, 4:37 PM CST | Tornado Warning | OAX | Harrison, Shelby | 23 min |
| Dec 15, 4:46 PM CST | Tornado Warning | OAX | Pottawattamie, Shelby | 20 min |
| Dec 15, 4:54 PM CST | Tornado Warning | OAX | Montgomery, Page | 15 min |
| Dec 15, 4:55 PM CST | Tornado Warning | OAX | Shelby | 14 min |
Nearby
Tornado Warnings in Iowa, 2021Tornado Warnings in Nebraska, 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.