Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 127, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Dec 15, 2021, 5:52 PM CST for 12 counties in Iowa. It was in force for 53 min. 6 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, 5:52 PM CST (23:52 UTC)
- Expired
- Dec 15, 2021, 6:45 PM CST
- In force
- 53 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Damage threat
- Destructive
- Hail
- 0.75 in
- Wind
- 80.0 mph
Counties Boone County, IA, Franklin County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 23:56 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, 6:08 PM CST | TSTM WND GST 58 | 2 S Ames, IA | |
| Dec 15, 6:13 PM CST | TSTM WND GST 70 | Gilbert, IA | |
| Dec 15, 6:23 PM CST | TSTM WND DMG | 2 N Galt, IA | BARN WALL COLLAPSED, TREE DAMAGE. REPORT FROM BROADCAST MEDIA. TIME ESTIMATED VIA RADAR. |
| Dec 15, 6:25 PM CST | TSTM WND DMG | Belmond, IA | 3 TO 4 OUTBUILDINGS COMPLETELY DESTROYED NEAR BELMOND. TIME ESTIMATED BY RADAR. |
| Dec 15, 6:27 PM CST | TSTM WND DMG | Maxwell, IA | LARGE TREE ON HOME. TIME ESTIMATED VIA RADAR. |
| Dec 15, 6:32 PM CST | HAIL 1 | 2 Wnw Coulter, IA | QUARTER SIZE HAIL REPORTED AT HWY 3 AND INTERSTATE 35. |
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
Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 245 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
- 1 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 455 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 251 m²/s²
- 0-3 km storm-relative helicity
- 291 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
818
WUUS53 KDMX 152352
SVRDMX
IAC015-069-079-081-083-091-109-127-169-187-189-197-160045-
/O.NEW.KDMX.SV.W.0127.211215T2352Z-211216T0045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
552 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Story County in central Iowa...
Marshall County in central Iowa...
Hardin County in central Iowa...
Northeastern Webster County in central Iowa...
Wright County in north central Iowa...
Western Franklin County in north central Iowa...
Eastern Kossuth County in north central Iowa...
Hancock County in north central Iowa...
Eastern Humboldt County in north central Iowa...
Eastern Boone County in central Iowa...
Hamilton County in central Iowa...
Winnebago County in north central Iowa...
* Until 645 PM CST.
* At 552 PM CST, severe thunderstorms were located along a line
extending from near Swan Lake to near Slater, moving northeast at
85 mph.
THESE ARE DESTRUCTIVE STORMS FOR portions of central and northern
iowa.
HAZARD...80 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be heavily damaged. Expect
considerable damage to roofs, windows, and vehicles.
Extensive tree damage and power outages are likely.
* Severe thunderstorms will be near...
Slater and Iowa State Center around 555 PM CST.
Ames, Nevada and Huxley around 600 PM CST.
Other locations in the path of these severe thunderstorms include
State Center.
This includes Interstate 35 between mile markers 102 and 178.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
&&
LAT...LON 4350 9365 4322 9350 4291 9350 4291 9333
4230 9300 4221 9300 4221 9295 4186 9277
4186 9377 4221 9387 4221 9393 4350 9427
TIME...MOT...LOC 2352Z 244DEG 72KT 4335 9460 4193 9373
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH
$$
Cogil1 follow-up statement
993
WWUS53 KDMX 160034
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
634 PM CST Wed Dec 15 2021
IAC091-187-160044-
/O.CAN.KDMX.SV.W.0127.000000T0000Z-211216T0045Z/
Webster IA-Humboldt IA-
634 PM CST Wed Dec 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WEBSTER AND
EASTERN HUMBOLDT COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
LAT...LON 4350 9365 4322 9350 4291 9350 4291 9333
4230 9300 4221 9300 4221 9295 4186 9277
4186 9372 4255 9360 4326 9415 4350 9427
TIME...MOT...LOC 0034Z 270DEG 72KT 4370 9360 4228 9274
$$
IAC015-069-079-081-083-109-127-169-189-197-160045-
/O.CON.KDMX.SV.W.0127.000000T0000Z-211216T0045Z/
Story IA-Marshall IA-Hardin IA-Wright IA-Franklin IA-Kossuth IA-
Hancock IA-Boone IA-Hamilton IA-Winnebago IA-
634 PM CST Wed Dec 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CST
FOR STORY...MARSHALL...HARDIN...EASTERN WRIGHT...WESTERN FRANKLIN...
NORTHEASTERN KOSSUTH...HANCOCK...SOUTHEASTERN BOONE...EASTERN
HAMILTON AND WINNEBAGO COUNTIES...
At 634 PM CST, severe thunderstorms were located along a line
extending from near Alden to near Grundy Center, moving east at 85
mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe thunderstorms will remain over mainly rural areas of
Story, Marshall, Hardin, eastern Wright, western Franklin,
northeastern Kossuth, Hancock, southeastern Boone, eastern Hamilton
and Winnebago Counties, including the following locations... Wesley,
Steamboat Rock, Ferguson, Forest City Municipal Airport, Radcliffe,
Bradford, Maxwell, Cambridge, Melbourne and Buffalo Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4350 9365 4322 9350 4291 9350 4291 9333
4230 9300 4221 9300 4221 9295 4186 9277
4186 9372 4255 9360 4326 9415 4350 9427
TIME...MOT...LOC 0034Z 270DEG 72KT 4370 9360 4228 9274
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
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, 5:45 PM CST | Tornado Warning | DMX | Calhoun, Pocahontas, Webster | 30 min |
| Dec 15, 5:58 PM CST | Tornado Warning | DMX | Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas | 32 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning 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.