Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 106, NWS La Crosse, WI

December 15, 20214 counties in Iowa; Fillmore County, Mower County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Dec 15, 2021, 6:37 PM CST for 4 counties in Iowa; Fillmore County, Mower County, Minnesota. It was in force for 68 min. 29 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, 6:37 PM CST (00:37 UTC)
Expired: Dec 15, 2021, 7:45 PM CST
In force: 68 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Chickasaw County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Fillmore County, MN, Mower County, MN

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 00:41 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, 7:00 PM CST	TSTM WND DMG	1 E Rudd, IA	ROOF ON HWY 27 NEAR PARK ENTRANCE.
Dec 15, 7:00 PM CST	TSTM WND DMG	5 Nne Marble Rock, IA	NUMEROUS REPORTS OF WIND DAMAGE TO HOUSES.
Dec 15, 7:00 PM CST	TSTM WND DMG	Floyd, IA	OVERTURNED SEMI-TRUCK TRAILER AT TRUCK STOP.
Dec 15, 7:06 PM CST	TSTM WND DMG	1 Se Mitchell, IA	REPORTS OF FLATTENED FARM BUILDINGS.
Dec 15, 7:09 PM CST	HAIL 1	Charles City, IA	NICKEL TO QUARTER SIZED HAIL REPORTED.
Dec 15, 7:15 PM CST	TSTM WND DMG	Rudd, IA	DAMAGE TO RAILROAD TRACKS.
Dec 15, 7:15 PM CST	TSTM WND GST 55	2 E Charles City, IA
Dec 15, 7:15 PM CST	TSTM WND GST 55	3 E Charles City, IA	AWOS STATION KCCY CHARLES CITY AIRPORT.
Dec 15, 7:20 PM CST	TSTM WND DMG	1 N Elma, IA	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.
Dec 15, 7:20 PM CST	TSTM WND GST 63	2 N Ionia, IA	IOWA DOT SENSOR.
Dec 15, 7:20 PM CST	TSTM WND GST 63	2 N Ionia, IA	MESONET STATION RNHI4 2 N IONIA.
Dec 15, 7:20 PM CST	NON-TSTM WND GST 63	2 N Ionia, IA	MESONET STATION RNHI4 2 N IONIA.
Dec 15, 7:22 PM CST	TSTM WND GST 60	2 Ese Austin, MN	AUTOMATED WEATHER OBSERVATION FROM THE AUSTIN AIRPORT.
Dec 15, 7:22 PM CST	TSTM WND GST 60	Austin, MN
Dec 15, 7:27 PM CST	TSTM WND DMG	Adams, MN	DAMAGE TO BARN/OUTBUILDING. REPORT VIA KAAL, TIMING BASED ON RADAR.
Dec 15, 7:28 PM CST	TSTM WND DMG	1 Se Le Roy, MN	BARN DESTROYED IN LE ROY. REPORT VIA KTTC TWITTER. TIME ESTIMATED.
Dec 15, 7:28 PM CST	TSTM WND DMG	2 Wnw Davis Corners, IA	TREES UPROOTED, POWER POLES SNAPPED AND METAL BARN ROOF PARTIALLY BLOWN OFF. REPORT VIA TWITTER. TIME ESTIMATED.
Dec 15, 7:29 PM CST	TSTM WND GST 59	1 W Le Roy, MN
Dec 15, 7:30 PM CST	TSTM WND DMG	4 Wsw Vernon Springs, IA	MAJOR DAMAGE SUSTAINED BY LARGE OUTBUILDING SOUTHWEST OF CRESCO. ALSO MAJOR STRUCTURAL DAMAGE AT A NEARBY HOG FARM. TIME ESTIMATED FROM RADAR.
Dec 15, 7:33 PM CST	TSTM WND GST 83	3 S Grand Meadow, MN
Dec 15, 7:34 PM CST	TSTM WND DMG	Grand Meadow, MN	ROOF COMPLETELY BLOWN OFF ONE SIDE OF A LARGE BUILDING. TWITTER REPORT. TIME ESTIMATED.
Dec 15, 7:35 PM CST	TSTM WND GST 73	1 Ene Dexter, MN	MESONET STATION MN010 1 ENE DEXTER.
Dec 15, 7:35 PM CST	TSTM WND GST 79	Elkton, MN
Dec 15, 7:37 PM CST	TSTM WND DMG	Cresco, IA	POWER OUTAGES REPORTED
Dec 15, 7:37 PM CST	TSTM WND DMG	Cresco, IA	POWER OUTAGES REPORTED.
Dec 15, 7:40 PM CST	TSTM WND DMG	Racine, MN	TREES UPROOTED AND LARGE BRANCHES BLOWN DOWN. REPORT VIA TWITTER.
Dec 15, 7:40 PM CST	NON-TSTM WND GST 73	1 Ene Dexter, MN	MESONET STATION MN010 1 ENE DEXTER.
Dec 15, 7:50 PM CST	TSTM WND DMG	Spring Valley, MN	REPORTS OF WIDESPREAD POWER OUTAGES
Dec 15, 7:50 PM CST	TSTM WND DMG	Spring Valley, MN	REPORTS OF WIDESPREAD POWER OUTAGES.

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, 5:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 165 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 633 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 443 m²/s²
0-3 km storm-relative helicity: 470 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted.

683 
WUUS53 KARX 160037
SVRARX
IAC037-067-089-131-MNC045-099-160145-
/O.NEW.KARX.SV.W.0106.211216T0037Z-211216T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
637 PM CST Wed Dec 15 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Mitchell County in north central Iowa...
  Howard County in northeastern Iowa...
  Floyd County in north central Iowa...
  Chickasaw County in northeastern Iowa...
  Mower County in southeastern Minnesota...
  Western Fillmore County in southeastern Minnesota...

* Until 745 PM CST.

* At 636 PM CST, severe thunderstorms were located along a line
  extending from near Eagle Lake to near Sheffield to 7 miles
  southwest of Eldora, moving northeast at 75 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Rockford and Marble Rock around 650 PM CST.
  Rudd around 655 PM CST.
  Charles City and Floyd around 700 PM CST.
  Riceville around 715 PM CST.
  Austin and Le Roy around 720 PM CST.
  Nashua, Brownsdale and Lime Springs around 725 PM CST.
  Ionia around 730 PM CST.
  New Hampton, Fredericksburg and Wykoff around 735 PM CST.

Other locations impacted by these severe thunderstorms include
Forestville State Park, Toeterville, Vernon Springs, Bradford,
Chickasaw, County Roads T 54 And A 31 and Fillmore.

This includes Interstate 90 in Minnesota between mile markers 175 and
204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

&&

LAT...LON 4385 9269 4383 9269 4385 9226 4349 9208
      4291 9208 4291 9302 4385 9305
TIME...MOT...LOC 0036Z 220DEG 65KT 4316 9368 4286 9313 4226 9318 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Rieck

3 follow-up statements

902 
WWUS53 KARX 160052
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
652 PM CST Wed Dec 15 2021

IAC037-067-089-131-MNC045-099-160145-
/O.CON.KARX.SV.W.0106.000000T0000Z-211216T0145Z/
Mitchell IA-Howard IA-Floyd IA-Chickasaw IA-Mower MN-Fillmore MN-
652 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CST
FOR MITCHELL...HOWARD...FLOYD...CHICKASAW...MOWER AND WESTERN
FILLMORE COUNTIES...

At 652 PM CST, severe thunderstorms were located along a line
extending from 8 miles southeast of Rice Lake to near Marble Rock to
6 miles northwest of Grundy Center, moving northeast at 75 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 storms will be near...
  Marble Rock around 655 PM CST.
  Charles City and Floyd around 700 PM CST.
  Riceville, Lyle and Elma around 715 PM CST.
  Austin and Rose Creek around 720 PM CST.
  Brownsdale and Lime Springs around 725 PM CST.
   
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4385 9269 4383 9269 4385 9226 4349 9208
      4291 9208 4291 9302 4385 9305
TIME...MOT...LOC 0052Z 222DEG 63KT 4331 9338 4301 9283 4241 9288 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Rieck

965 
WWUS53 KARX 160105
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
705 PM CST Wed Dec 15 2021

IAC037-067-089-131-MNC045-099-160145-
/O.CON.KARX.SV.W.0106.000000T0000Z-211216T0145Z/
Mitchell IA-Howard IA-Floyd IA-Chickasaw IA-Mower MN-Fillmore MN-
705 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CST
FOR MITCHELL...HOWARD...FLOYD...CHICKASAW...MOWER AND WESTERN
FILLMORE COUNTIES...

At 704 PM CST, severe thunderstorms were located along a line
extending from near Northwood to 6 miles northeast of Charles City to
near Dike, moving northeast at 75 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
  Riceville, Lyle, Elma, Austin, Rose Creek, Brownsdale, Lime 
  Springs, Fredericksburg and Lawler.

This includes Interstate 90 in Minnesota between mile markers 175 and
204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4385 9269 4383 9269 4385 9226 4349 9208
      4291 9208 4291 9302 4385 9305
TIME...MOT...LOC 0104Z 218DEG 69KT 4345 9317 4315 9261 4254 9259 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Rieck

969 
WWUS53 KARX 160131
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
731 PM CST Wed Dec 15 2021

IAC067-160140-
/O.CAN.KARX.SV.W.0106.000000T0000Z-211216T0145Z/
Floyd IA-
731 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR FLOYD COUNTY 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 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

LAT...LON 4385 9269 4383 9269 4385 9226 4349 9208
      4291 9208 4291 9245 4317 9256 4321 9255
      4321 9258 4385 9305
TIME...MOT...LOC 0130Z 220DEG 65KT 4380 9277 4350 9221 4289 9219 

$$

IAC037-089-131-MNC045-099-160145-
/O.CON.KARX.SV.W.0106.000000T0000Z-211216T0145Z/
Mitchell IA-Howard IA-Chickasaw IA-Mower MN-Fillmore MN-
731 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CST
FOR EASTERN MITCHELL...HOWARD...CHICKASAW...MOWER AND WESTERN
FILLMORE COUNTIES...

At 730 PM CST, severe thunderstorms were located along a line
extending from 6 miles northeast of Brownsdale to near Lime Springs
to near Fredericksburg, moving northeast at 75 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Austin, Cresco, New Hampton, Spring Valley, Grand Meadow,
Fredericksburg, Le Roy, Adams, Riceville, Brownsdale, Elma, Lime
Springs, Wykoff, Lawler, and Rose Creek.

This includes Interstate 90 in Minnesota between mile markers 182 and
204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for north central
and northeastern Iowa...and southeastern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4385 9269 4383 9269 4385 9226 4349 9208
      4291 9208 4291 9245 4317 9256 4321 9255
      4321 9258 4385 9305
TIME...MOT...LOC 0130Z 220DEG 65KT 4380 9277 4350 9221 4289 9219 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Rieck

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 15, 6:44 PM CST	Tornado Warning	ARX	Floyd	32 min
Dec 15, 7:25 PM CST	Tornado Warning	ARX	Howard	20 min
Dec 15, 7:29 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Allamakee, Clayton, Fayette, Winneshiek	61 min
Dec 15, 7:38 PM CST	Tornado Warning	ARX	Winneshiek	37 min
Dec 15, 8:16 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Allamakee, Clayton	74 min
Dec 15, 8:29 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Allamakee, Clayton	31 min
Dec 15, 7:24 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Dodge, Fillmore, Olmsted, Wabasha, Winona	51 min
Dec 15, 7:49 PM CST	Tornado Warning	ARX	Olmsted	14 min
Dec 15, 7:53 PM CST	Severe Thunderstorm Warning Destructive damage threat	ARX	Houston, Wabasha, Winona	67 min
Dec 15, 7:58 PM CST	Tornado Warning	ARX	Winona	47 min
Dec 15, 8:01 PM CST	Tornado Warning	ARX	Wabasha	44 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Severe Thunderstorm Warnings in Minnesota, 2021 Every 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.