Minnesota, 2021

Tornadoes and Hail in Minnesota, December 15, 2021

December 15, 2021 · NWS ARX · 82 events in 7 counties and zones

An intense storm system moved across the Upper Midwest on December 15th and produced a rare severe weather outbreak across southeast Minnesota. One person was killed near Rochester (Olmsted County) when a large tree fell on the victim.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
1
Injuries
0
Property damage
$2.9 million
Crop damage
None recorded
Events
82

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS ARX wrote it up.

An intense storm system moved across the Upper Midwest on December 15th and produced a rare severe weather outbreak across southeast Minnesota. One person was killed near Rochester (Olmsted County) when a large tree fell on the victim. Twelve tornadoes occurred across parts of Mower, Fillmore, Houston, Dodge, Winona and Wabasha Counties. Eight of these tornadoes were rated EF1 with the others rated EF0. The tornadoes largely moved through rural areas damaging trees, power lines and farm buildings with the exception of an EF0 tornado that moved through the eastern sections of Preston (Fillmore County) and and EF1 tornado that tracked across Homer (Winona County). In addition to the tornadoes, damaging winds occurred with several reports of wind speeds over 70 mph. The highest recorded wind gusts were 85 mph in Plainview (Wabasha County), 84 mph in Harmony (Fillmore County) and Mabel (Fillmore County) and 83 mph south of Grand Meadow (Mower County). A state of emergency was declared in Fillmore County. The Governor of Minnesota authorized emergency assistance for the following counties: Dodge, Fillmore, Houston, Mower, Olmsted and Wabasha.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before the first event at Dec 15, 4:45 PM CST, 2 hours 26 minutes earlier.

Area forecast discussion, Dec 15, 4:45 PM CST, 2 hours 26 minutes before
Area Forecast Discussion
National Weather Service La Crosse WI
445 PM CST Wed Dec 15 2021

.SHORT TERM...(This evening through Thursday)
Issued at 220 PM CST Wed Dec 15 2021

...Very Rare, dangerous December severe weather risk/high winds
this evening and tonight...

Not much change in thinking regarding the storm/wind threats this
evening and overnight. Improvement in dense fog slowly continues
early this afternoon north of I-94 as a warm front lifts north,
but fog could linger through the afternoon across north-central
WI. South of the front, temps quickly climb into the 50s and 60s
to even near 70 in spots, record values for many, along with dew
points in the 50s to low 60s. In addition, southerly winds have
increased to 15 to 25 mph with gusts of 30 to 40 mph in the warm
sector. Despite impressive wind fields aloft, wind gusts in the
warm sector will be tempered a bit with the strong elevated warm
nose/modest vertical mixing in the warm advective regime.

An intense, compact, negatively-tilted shortwave trough evident
across the central plains early this afternoon will race northeast
to near Lake Superior by early Thursday morning with the
associated surface low deepening to near 976 mb. Very strong
warm/moist advection will occur ahead of the associated cold front
with extremely strong, anomalous wind fields. A cyclonically
curved 100+ kt jet streak will lift across the region this evening
with 850 mb flow increasing to 70 to 80 kts. As has been
reiterated in recent days, the moisture/wind field anomalies with
this system are remarkably anomalous, in some cases outside of the
model climatology.

A strongly forced, low-topped linear band of convection will
develop to the southwest this evening, encroaching on the area by
6-7 pm, and then quickly racing across the region through around
11 pm. Low- level shear will be very strong, with around 50 kts of
0-1 km bulk shear. While still on the modest side, forecast
instability values have crept up over the past day, with SBCAPE
expected to reach 500- 750 J/kg, and HREF ensemble max values up
to 1000 J/kg. There remains a significant, higher end, wind threat
with these storms, given the storm motions over 60 to 70 mph and
very strong winds aloft. Wind gusts in excess of 80 mph are
possible with the strongest storms, while any storms could produce
gusts of 60 to 70+ mph. In addition, given the very strong low-
level shear, fast-moving tornadoes could occur, and potentially a
strong tornado (especially west of the MS) given the impressive
dynamics/wind fields with the system. Certainly a very rare
environment for mid-December.

Behind the front, very strong non-convective wind gusts will
overspread the region as lapse rates steepen with a push of cold
advection and strong pressure rises. Based on winds at the top of
the mixed layer, gusts up to around 65 mph are expected. The
intense winds will occur over a several hour period through the
early morning hours, gradually dropping off towards sunrise.

Although not unseasonably cool, much colder temps in the 20s and
30s are expected late tonight and Thursday behind the front,
possibly leading to slick spots on roads that may be wet. There is
some signal for freezing drizzle across north-central WI late
tonight, although confidence isn't high. Otherwise, winds will
gust up to 30 to 40+ mph well into Thursday.

.LONG TERM...(Thursday night through Wednesday)
Issued at 220 PM CST Wed Dec 15 2021

The next chance for some precipitation looks to arrive Friday
night and possibly linger into Saturday. A northern stream short
wave trough will drop out of Canada and move across the Upper
Midwest. While the models are all showing this wave, there are
quite a few differences on the strength and track of the wave. As
of now, it would appear the best forcing should pass by to the
north of the area with giving just some small chance for light
snow generally north of Interstate 90. After that, upper level
ridging will build in for the weekend and then transition into a
zonal flow. The next short wave trough in this pattern looks to
move by well to the north of the region across southern Canada.
This system should push a cold front through early next week, but
at this time, it looks to come through dry.

&&

.AVIATION...(For the 00Z TAFS through 00Z Thursday night)
Issued at 445 PM CST Wed Dec 15 2021

Dangerous storm moving through tonight with wind, storms and some
cig impacts.

Cigs: brief drop in cigs with line of storms early this evening,
then scattered for a few hours and then back into MVFR for the night
through Thu morning. Should see a scattering of the deck by mid
afternoon.

WX/vsby: strong/severe line of storms will drive across the TAF
sites early this evening (01-03z)...likely only impacting for 1/2
hour or less. Some vsby restrictions with heavy rain. With passage
of cold front later tonight not expecting fog.

Winds: very strong tonight into Thu morning with strongest gusts
tonight upwards of 50 kts from the south/southwest. With the
thunderstorms (01-03z) winds will be a bit more southwest and could
gust closer to 70 kts. Passage of the storm's cold front
overnight/early Thu morning will swing winds to more westerly with a
gradual decrease through the day.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...High Wind Warning until 6 AM CST Thursday for WIZ017-029-032>034-
     041>044-053>055-061.

     Dense Fog Advisory until 6 PM CST this evening for WIZ017-029.

MN...High Wind Warning until 6 AM CST Thursday for MNZ079-086>088-
     094>096.

IA...High Wind Warning until 6 AM CST Thursday for IAZ008>011-018-019-
     029-030.

&&

SHORT TERM...JM
LONG TERM...04
AVIATION...Rieck
Hazardous weather outlook, Dec 15, 2:06 PM CST, 5 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service La Crosse WI
206 PM CST Wed Dec 15 2021

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-161200-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
206 PM CST Wed Dec 15 2021

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...This Afternoon and Tonight

A line of thunderstorms will race across the area between 6 PM
and 11 PM. These storms will move east/northeast at 60 to 70 mph
and will be capable of producing damaging wind gusts of 70 mph
and
isolated gusts of 80 mph or higher. Tornadoes will also be
possible, particularly near and west of the Mississippi River.
There is the potential for a strong tornado to occur.

A High Wind Warning is in effect tonight. Dangerously strong wind
gusts to 65 mph are expected which could result in tree and power
line damage, leading to power outages.

Plummeting temperatures overnight could result in a flash freeze,
leading to some icy roads and sidewalks.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Wind gusts to 45 mph are possible early Thursday.

.SPOTTER INFORMATION STATEMENT...

Any damage reports or wind gust observations would be
appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

04

In the hours before

Local storm report, Dec 15, 7:11 PM CST, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
711 PM CST WED DEC 15 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0709 PM     HAIL             CHARLES CITY            43.06N 92.67W
12/15/2021  E1.00 INCH       FLOYD              IA   FIRE DEPT/RESCUE

            NICKEL TO QUARTER SIZED HAIL REPORTED.

&&

JAR

The radar

The La Crosse radar (KARX), 153 km away, was scanning. The volume nearest the first event began at 01:08 UTC.

Open the radar archive at this moment

Event by event

68 thunderstorm wind, 12 tornado, 1 funnel cloud, 1 hail. Local standard time, as filed.

Tornado, Mower

When
December 15, 7:11 PM CST to 7:12 PM CST
Where
Mower County, 4.09 mi WNW of Lyle to 3.81 mi WNW of Lyle
Rating
EF0
Path length
0.67 mi
Path width
50 yd
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
43.514, -93.049

This tornado originally developed in Worth County, Iowa, moved into Freeborn County, Minnesota before crossing into Mower County west of Lyle. The tornado was only on the ground for about one minute in Mower County as it moved northeast and dissipated. One farm was damaged by the tornado, otherwise, damage was limited to trees.

Thunderstorm Wind, Mower

When
December 15, 7:17 PM CST
Where
Mower County, 3.65 mi SW of Varco
Measured
56 kt (64 mph) estimated gust
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
43.590, -93.040

The roof of a house was damaged and trees were snapped off southwest of Austin.

Thunderstorm Wind, Mower

When
December 15, 7:17 PM CST
Where
Mower County, 2.56 mi SW of Varco
Measured
56 kt (64 mph) estimated gust
Property damage
$5,000
Reported by
Newspaper
Coordinates
43.590, -93.010

Large trees were snapped off in a cemetery southwest of Austin.

Thunderstorm Wind, Mower

When
December 15, 7:17 PM CST
Where
Mower County, 2.43 mi SW of Varco
Measured
56 kt (64 mph) estimated gust
Property damage
$7,000
Reported by
NWS Storm Survey
Coordinates
43.600, -93.020

The roof to a house sustained some damage and trees were blown down southwest of Austin.

Thunderstorm Wind, Mower

When
December 15, 7:18 PM CST
Where
Mower County, 1.65 mi WSW of Varco
Measured
56 kt (64 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.610, -93.010

Trees were blown down southwest of Austin.

Thunderstorm Wind, Mower

When
December 15, 7:22 PM CST
Where
Mower County, Austin
Measured
52 kt (60 mph) measured gust
Property damage
$50,000
Reported by
AWOS
Coordinates
43.670, -92.930

The automated weather observing equipment at the Austin airport measured a wind gust of 60 mph. The winds blew down trees and power lines throughout Austin causing the entire city to lose power.

Thunderstorm Wind, Mower

When
December 15, 7:27 PM CST
Where
Mower County, 0.85 mi SE of Adams
Measured
51 kt (59 mph) estimated gust
Property damage
$15,000
Reported by
Public
Coordinates
43.560, -92.720

Wind damage occurred to a barn and outbuilding near Adams.

Thunderstorm Wind, Mower

When
December 15, 7:28 PM CST
Where
Mower County, 1.22 mi SE of Le Roy
Measured
52 kt (60 mph) estimated gust
Property damage
$50,000
Reported by
Broadcast Media
Coordinates
43.510, -92.500

A barn was destroyed near Le Roy.

Thunderstorm Wind, Mower

When
December 15, 7:29 PM CST
Where
Mower County, 0.85 mi SW of Le Roy
Measured
51 kt (59 mph) estimated gust
Reported by
Amateur Radio
Coordinates
43.510, -92.530

An estimated 59 mph wind just occurred near Le Roy.

Thunderstorm Wind, Mower

When
December 15, 7:29 PM CST
Where
Mower County, 0.85 mi SE of Elkton
Measured
69 kt (79 mph) estimated gust
Reported by
Broadcast Media
Coordinates
43.660, -92.710

An estimated 79 mph wind gust occurred in Elkton.

Thunderstorm Wind, Mower

When
December 15, 7:32 PM CST
Where
Mower County, 2.11 mi ENE of Dexter
Measured
63 kt (72 mph) measured gust
Reported by
Mesonet
Coordinates
43.730, -92.680

A 73 mph wind gust was measured by a mesonet sensor just northeast of Dexter.

Thunderstorm Wind, Dodge

When
December 15, 7:32 PM CST
Where
Dodge County, 0.5 mi W of Dodge Center Arpt
Measured
50 kt (58 mph) measured gust
Reported by
AWOS
Coordinates
44.020, -92.840

The automated weather observing equipment at the Dodge Center airport measured a 58 mph wind gust.

Thunderstorm Wind, Mower

When
December 15, 7:33 PM CST
Where
Mower County, 2.81 mi S of Grand Meadow
Measured
72 kt (83 mph) measured gust
Reported by
Trained Spotter
Coordinates
43.660, -92.570

An 83 mph wind gust was measured south of Grand Meadow.

Thunderstorm Wind, Mower

When
December 15, 7:34 PM CST to 7:36 PM CST
Where
Mower County, 3.76 mi ESE of Grand Meadow to 4.55 mi E of Grand Meadow
Measured
56 kt (64 mph) estimated gust
Property damage
$80,000
Reported by
NWS Storm Survey
Coordinates
43.680, -92.510

One side of a roof was blown off a large commercial building and trees were blown down in a path of wind damage southeast of Grand Meadow.

Tornado, Mower

When
December 15, 7:37 PM CST to 7:40 PM CST
Where
Mower County, 2.76 mi SSE of Racine to 1.98 mi ENE of Racine
Rating
EF1
Path length
3.32 mi
Path width
85 yd
Property damage
$210,000
Reported by
NWS Storm Survey
Coordinates
43.742, -92.484

This was the second tornado of the night across Mower County. This EF1 tornado formed south of Racine, moved northeast just missing the town and then dissipated northeast of Racine. This tornado lifted the roof off a home and destroyed some farm buildings.

Thunderstorm Wind, Fillmore

When
December 15, 7:38 PM CST
Where
Fillmore County, 0.85 mi NE of Spring Vly
Measured
53 kt (61 mph) estimated gust
Property damage
$10,000
Reported by
Amateur Radio
Coordinates
43.690, -92.390

Widespread power outages occurred in Spring Valley from downed power lines.

Thunderstorm Wind, Mower

When
December 15, 7:38 PM CST
Where
Mower County, 2.94 mi SSW of Racine
Measured
57 kt (66 mph) estimated gust
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
43.740, -92.520

Farm outbuildings were damaged northeast of Grand Meadow.

Thunderstorm Wind, Dodge

When
December 15, 7:39 PM CST
Where
Dodge County, 3 mi S of Claremont
Measured
43 kt (49 mph) estimated gust
Property damage
$3,000
Reported by
Emergency Manager
Coordinates
44.007, -93.000

Road signs were damaged south of Claremont by strong winds.

Thunderstorm Wind, Dodge

When
December 15, 7:40 PM CST
Where
Dodge County, 2.07 mi S of Kasson
Measured
52 kt (60 mph) estimated gust
Property damage
$50,000
Reported by
Public
Coordinates
44.000, -92.750

Part of the roof was blown off a large livestock building south of Kasson.

Thunderstorm Wind, Mower

When
December 15, 7:40 PM CST
Where
Mower County, 1 mi E of Racine
Measured
51 kt (59 mph) estimated gust
Property damage
$30,000
Reported by
Newspaper
Coordinates
43.780, -92.480

A metal pole shed was destroyed, trees were uprooted and large branches blown down in Racine.

Thunderstorm Wind, Fillmore

When
December 15, 7:40 PM CST to 7:44 PM CST
Where
Fillmore County, 2.13 mi SSE of Bristol to 2.86 mi ENE of Bristol
Measured
57 kt (66 mph) estimated gust
Property damage
$90,000
Reported by
NWS Storm Survey
Coordinates
43.520, -92.170

A path of wind damage was found near Bristol. An open air farm outbuilding was destroyed, the roof ripped off a large barn, trees and wooded electrical poles were snapped.

Thunderstorm Wind, Fillmore

When
December 15, 7:40 PM CST
Where
Fillmore County, 1.9 mi WNW of Granger
Measured
57 kt (66 mph) estimated gust
Property damage
$50,000
Reported by
Newspaper
Coordinates
43.506, -92.137

An open air, metal outbuilding was destroyed north of Granger.

Tornado, Fillmore

When
December 15, 7:42 PM CST to 7:46 PM CST
Where
Fillmore County, 1.09 mi WNW of Washington to 4.66 mi NNE of Washington
Rating
EF0
Path length
4.6 mi
Path width
80 yd
Property damage
$265,000
Reported by
NWS Storm Survey
Coordinates
43.776, -92.370

This EF0 tornado moved across rural portions of northwest Fillmore County west of Chatfield. The tornado produced damage to several farm buildings and trees along its path.

Thunderstorm Wind, Olmsted

When
December 15, 7:43 PM CST
Where
Olmsted County, 0.85 mi NW of Stewartville
Measured
55 kt (63 mph) estimated gust
Property damage
$10,000
Reported by
Emergency Manager
Coordinates
43.860, -92.490

Widespread power outages occurred in Stewartville from downed power lines.

Funnel Cloud, Fillmore

When
December 15, 7:44 PM CST
Where
Fillmore County, 0.85 mi SE of Harmony
Reported by
Trained Spotter
Coordinates
43.540, -92.010

A funnel cloud was sighted near Harmony.

Thunderstorm Wind, Fillmore

When
December 15, 7:44 PM CST to 7:47 PM CST
Where
Fillmore County, 3.65 mi SW of Hutton to 2.3 mi SSW of Preston
Measured
55 kt (63 mph) estimated gust
Property damage
$50,000
Reported by
Trained Spotter
Coordinates
43.590, -92.110

A path of wind damage occurred south of Preston. Trees were blown down and roofs were removed from a couple of cattle barns.

Thunderstorm Wind, Fillmore

When
December 15, 7:45 PM CST
Where
Fillmore County, 0.5 mi E of Harmony
Measured
73 kt (84 mph) measured gust
Reported by
Public
Coordinates
43.550, -92.010

An 84 mph wind gust was measured in Harmony with a private weather station.

Thunderstorm Wind, Olmsted

When
December 15, 7:45 PM CST
Where
Olmsted County, 0.69 mi S of (Rst)rochester Muni
Measured
67 kt (77 mph) measured gust
Reported by
ASOS
Coordinates
43.910, -92.500

A 77 mph wind gust was measured by the automated weather observing equipment at the Rochester airport.

Thunderstorm Wind, Dodge

When
December 15, 7:45 PM CST
Where
Dodge County, 2.1 mi ESE of Kasson
Measured
63 kt (72 mph) measured gust
Reported by
Mesonet
Coordinates
44.020, -92.710

A 72 mph wind gust was measured by a mesonet station east of Kasson.

Thunderstorm Wind, Fillmore

When
December 15, 7:45 PM CST
Where
Fillmore County, 4.6 mi NNW of Washington
Measured
57 kt (66 mph) estimated gust
Property damage
$15,000
Reported by
Public
Coordinates
43.830, -92.390

The walls of a farm outbuilding were blown out north of Washington.

Thunderstorm Wind, Olmsted

When
December 15, 7:45 PM CST
Where
Olmsted County, 2.58 mi WSW of Pleasant Grove
Measured
57 kt (66 mph) estimated gust
Property damage
$50,000
Reported by
NWS Storm Survey
Coordinates
43.860, -92.430

An open air farm outbuilding was destroyed and a quarter of the roof was removed from a barn east of Stewartville.

Thunderstorm Wind, Fillmore

When
December 15, 7:46 PM CST
Where
Fillmore County, 5.23 mi NNW of Washington
Measured
57 kt (66 mph) estimated gust
Property damage
$10,000
Reported by
Public
Coordinates
43.840, -92.390

Wooden power poles were snapped north of Washington.

Thunderstorm Wind, Olmsted

When
December 15, 7:46 PM CST
Where
Olmsted County, 2.42 mi NE of Stewartville
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.870, -92.440

Trees were snapped off northeast of Stewartville.

Thunderstorm Wind, Olmsted

When
December 15, 7:47 PM CST
Where
Olmsted County, Pleasant Grove
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
Public
Coordinates
43.870, -92.380

Trees were snapped off in Pleasant Grove.

Tornado, Fillmore

When
December 15, 7:48 PM CST to 7:49 PM CST
Where
Fillmore County, 0.7 mi S of Preston to 0.27 mi SW of Preston
Rating
EF0
Path length
0.51 mi
Path width
40 yd
Property damage
$275,000
Reported by
NWS Storm Survey
Coordinates
43.670, -92.081

This was the second tornado of the night in Fillmore County. This narrow EF0 tornado moved across the eastern and northern parts of Preston. Houses, sheds, cars and trees were damaged along the path. The roofs of the fire department and city hall were both damaged.

Thunderstorm Wind, Dodge

When
December 15, 7:49 PM CST
Where
Dodge County, 2.13 mi NNW of West Concord
Measured
54 kt (62 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
44.180, -92.910

Trees were blown down north of West Concord.

Thunderstorm Wind, Olmsted

When
December 15, 7:49 PM CST
Where
Olmsted County, 1.7 mi SW of Cummingsville
Measured
57 kt (66 mph) estimated gust
Property damage
$80,000
Reported by
NWS Storm Survey
Coordinates
43.860, -92.290

A large farm building was blown down southwest of Cummingsville.

Tornado, Dodge

When
December 15, 7:50 PM CST to 7:51 PM CST
Where
Dodge County, 3 mi N of West Concord to 3.28 mi N of West Concord
Rating
EF1
Path length
0.6 mi
Path width
75 yd
Continued into
Goodhue, Mn (MPX)
Property damage
$10,000
Reported by
NWS Storm Survey
Coordinates
44.193, -92.901

An EF1 tornado formed in far northern Dodge County north of West Concord and then moved northeast into Goodhue County. Two farms along the path of the tornado sustained minor damage.

Tornado, Fillmore

When
December 15, 7:51 PM CST to 7:53 PM CST
Where
Fillmore County, 0.63 mi NNE of Preston to 0.77 mi SW of Isinours
Rating
EF1
Path length
1.77 mi
Path width
75 yd
Property damage
$230,000
Reported by
NWS Storm Survey
Coordinates
43.688, -92.074

This was the third tornado of the night in Fillmore County. This EF1 tornado developed northeast of Preston and moved northeast for about 2 miles before dissipating. Farm outbuildings and trees were damaged along the path.

Thunderstorm Wind, Olmsted

When
December 15, 7:51 PM CST
Where
Olmsted County, 1.47 mi SSW of Rochester
Measured
52 kt (60 mph) estimated gust
Property damage
$5,000
Reported by
Trained Spotter
Coordinates
44.010, -92.480

Trees were blown down in Rochester from an estimated 60 mph wind gust. A resident on the southeast side of the city was trapped in a house when a large tree fell and blocked the exit to the house.

Thunderstorm Wind, Olmsted

When
December 15, 7:51 PM CST
Where
Olmsted County, 0.5 mi W of Marion
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.950, -92.360

Trees were snapped off southeast of Rochester.

Thunderstorm Wind, Olmsted

When
December 15, 7:51 PM CST
Where
Olmsted County, Marion
Measured
57 kt (66 mph) estimated gust
Property damage
$4,000
Reported by
NWS Storm Survey
Coordinates
43.950, -92.350

Several large pine trees were snapped off southeast of Rochester.

Thunderstorm Wind, Olmsted

When
December 15, 7:53 PM CST
Where
Olmsted County, 2.96 mi ESE of Rochester
Measured
54 kt (62 mph) estimated gust
Deaths
1 direct, 0 indirect
Property damage
$10,000
Reported by
Law Enforcement
Coordinates
44.021, -92.412

One person was killed east of Rochester when a 40 foot pine tree was snapped off, fell and landed on the individual and his pickup truck.

Thunderstorm Wind, Olmsted

When
December 15, 7:54 PM CST
Where
Olmsted County, 2.44 mi NE of Marion
Measured
56 kt (64 mph) estimated gust
Property damage
$50,000
Reported by
Broadcast Media
Coordinates
43.974, -92.314

A barn was destroyed southwest of Eyota.

Thunderstorm Wind, Fillmore

When
December 15, 7:55 PM CST
Where
Fillmore County, 0.5 mi E of Mabel
Measured
73 kt (84 mph) measured gust
Reported by
Public
Coordinates
43.520, -91.770

An 84 mph wind gust was measured in Mabel with a private weather station.

Thunderstorm Wind, Fillmore

When
December 15, 7:58 PM CST
Where
Fillmore County, 7 mi N of Mabel
Measured
55 kt (63 mph) measured gust
Reported by
Public
Coordinates
43.621, -91.780

A 63 mph wind gust was measured with a private weather station north of Mabel.

Thunderstorm Wind, Fillmore

When
December 15, 8:00 PM CST
Where
Fillmore County, 0.69 mi S of Peterson
Measured
50 kt (58 mph) estimated gust
Property damage
$2,000
Reported by
Public
Coordinates
43.790, -91.830

Trees were blown down in Peterson.

Tornado, Fillmore

When
December 15, 8:01 PM CST to 8:02 PM CST
Where
Fillmore County, 1.16 mi SE of Arendahl to 1.29 mi ENE of Arendahl
Rating
EF1
Path length
1.19 mi
Path width
250 yd
Property damage
$40,000
Reported by
NWS Storm Survey
Coordinates
43.818, -91.903

This was the fourth tornado of the night in Fillmore County. This EF1 tornado formed just south of the tiny town of Arendahl and was only on the ground for one minute as it moved rapidly northeast. The damage was limited to a large grove of trees northeast of Arendahl.

Thunderstorm Wind, Fillmore

When
December 15, 8:01 PM CST
Where
Fillmore County, 0.5 mi W of Arendahl
Measured
57 kt (66 mph) estimated gust
Property damage
$8,000
Reported by
NWS Storm Survey
Coordinates
43.830, -91.930

Large trees were snapped in a cemetery near Arendahl.

Tornado, Fillmore

When
December 15, 8:02 PM CST to 8:04 PM CST
Where
Fillmore County, 1.17 mi NNW of Bratsberg to 3.22 mi SSE of Rushford
Rating
EF1
Path length
2.35 mi
Path width
75 yd
Property damage
$95,000
Reported by
NWS Storm Survey
Coordinates
43.746, -91.776

This was the fifth tornado of the night in Fillmore County. This EF1 tornado formed south of Rushford and moved to the northeast before dissipating. The tornado destroyed some farm outbuildings and damaged trees along its path.

Thunderstorm Wind, Fillmore

When
December 15, 8:02 PM CST
Where
Fillmore County, 1.5 mi E of Arendahl
Measured
57 kt (66 mph) estimated gust
Property damage
$5,000
Reported by
NWS Storm Survey
Coordinates
43.830, -91.890

Trees were blown down and snapped off east of Arendahl.

Thunderstorm Wind, Fillmore

When
December 15, 8:02 PM CST to 8:04 PM CST
Where
Fillmore County, 0.85 mi SW of Rushford Vlg to 1.47 mi NNE of Rushford Vlg
Measured
57 kt (66 mph) estimated gust
Property damage
$20,000
Reported by
NWS Storm Survey
Coordinates
43.810, -91.810

A path of wind damage occurred west of Rushford where trees were blown down, snapped and uprooted. A farm outbuilding was also damaged.

Thunderstorm Wind, Fillmore

When
December 15, 8:02 PM CST
Where
Fillmore County, 3.14 mi SSE of Rushford
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.780, -91.740

Large tree branches were broken southeast of Rushford.

Thunderstorm Wind, Wabasha

When
December 15, 8:02 PM CST
Where
Wabasha County, 3.71 mi SE of Plainview
Measured
50 kt (58 mph) estimated gust
Property damage
$25,000
Reported by
NWS Storm Survey
Coordinates
44.130, -92.120

A barn was destroyed southeast of Plainview.

Tornado, Wabasha

When
December 15, 8:03 PM CST to 8:07 PM CST
Where
Wabasha County, 3.04 mi SE of Plainview to 3.54 mi ENE of Plainview
Rating
EF1
Path length
4.03 mi
Path width
40 yd
Property damage
$65,000
Reported by
NWS Storm Survey
Coordinates
44.134, -92.134

An EF1 tornado developed southeast of Plainview and moved northeast across rural portions of southern Wabasha County. Farm outbuildings and trees were damaged along the path of the tornado.

Thunderstorm Wind, Wabasha

When
December 15, 8:04 PM CST
Where
Wabasha County, Plainview
Measured
74 kt (85 mph) measured gust
Reported by
Public
Coordinates
44.170, -92.170

An 85 mph wind gust was measured by a private weather station in Plainview.

Thunderstorm Wind, Winona

When
December 15, 8:04 PM CST
Where
Winona County, 3.49 mi S of Fremont
Measured
57 kt (66 mph) estimated gust
Property damage
$1,000
Reported by
NWS Storm Survey
Coordinates
43.870, -91.910

Large tree limbs were broke off south of Fremont.

Thunderstorm Wind, Wabasha

When
December 15, 8:04 PM CST
Where
Wabasha County, 2.1 mi ESE of Plainview
Measured
53 kt (61 mph) estimated gust
Property damage
$10,000
Reported by
NWS Storm Survey
Coordinates
44.160, -92.130

The metal roof was partially removed from a pole shed east of Plainview.

Thunderstorm Wind, Wabasha

When
December 15, 8:05 PM CST
Where
Wabasha County, Plainview
Measured
51 kt (59 mph) estimated gust
Property damage
$25,000
Reported by
Broadcast Media
Coordinates
44.170, -92.170

A large pole shed was extensively damaged in Plainview.

Thunderstorm Wind, Houston

When
December 15, 8:05 PM CST
Where
Houston County, 3.56 mi W of Perkins
Measured
53 kt (61 mph) estimated gust
Property damage
$1,000
Reported by
NWS Storm Survey
Coordinates
43.790, -91.720

Large tree branches were broken southwest of Money Creek.

Thunderstorm Wind, Wabasha

When
December 15, 8:05 PM CST
Where
Wabasha County, 2.03 mi NE of Elgin
Measured
52 kt (60 mph) estimated gust
Property damage
$40,000
Reported by
NWS Storm Survey
Coordinates
44.150, -92.220

A barn was destroyed northeast of Elgin.

Tornado, Houston

When
December 15, 8:06 PM CST to 8:11 PM CST
Where
Houston County, 1.51 mi S of Perkins to 3 mi NE of Money Creek
Rating
EF1
Path length
7.31 mi
Path width
250 yd
Property damage
$300,000
Reported by
NWS Storm Survey
Coordinates
43.758, -91.653

An EF1 tornado formed west of Houston and moved northeast, passing to the east of Money Creek before dissipating just before the Winona County line. Several farms along the Root River sustained damage from this tornado.

Thunderstorm Wind, Winona

When
December 15, 8:06 PM CST to 8:07 PM CST
Where
Winona County, 3.29 mi WSW of Hart to 1.99 mi W of Hart
Measured
53 kt (61 mph) estimated gust
Property damage
$50,000
Reported by
NWS Storm Survey
Coordinates
43.860, -91.790

A path of wind damage occurred west of Hart where the roof was removed from a farm outbuilding, a metal pole shed was destroyed and siding removed from a house.

Thunderstorm Wind, Houston

When
December 15, 8:08 PM CST to 8:10 PM CST
Where
Houston County, 1.65 mi WSW of Money Creek to 1.38 mi N of Money Creek
Measured
54 kt (62 mph) estimated gust
Property damage
$3,000
Reported by
NWS Storm Survey
Coordinates
43.810, -91.650

A path of wind damage occurred west of Money Creek where large tree limbs were broken off.

Tornado, Winona

When
December 15, 8:10 PM CST to 8:11 PM CST
Where
Winona County, 2.16 mi NNE of Wyattville to 2.6 mi SE of The Arches
Rating
EF0
Path length
0.63 mi
Path width
40 yd
Property damage
$95,000
Reported by
NWS Storm Survey
Coordinates
43.961, -91.791

This short-lived EF0 tornado moved over rural areas southeast of Lewiston. Farm outbuildings, a garage and trees were damaged by the tornado.

Thunderstorm Wind, Winona

When
December 15, 8:10 PM CST
Where
Winona County, 0.5 mi E of Lewiston
Measured
51 kt (59 mph) estimated gust
Property damage
$10,000
Reported by
Emergency Manager
Coordinates
43.980, -91.870

Power outages occurred in Lewiston from downed power lines.

Thunderstorm Wind, Winona

When
December 15, 8:11 PM CST
Where
Winona County, 2.55 mi SE of The Arches
Measured
55 kt (63 mph) estimated gust
Property damage
$50,000
Reported by
County Official
Coordinates
43.970, -91.790

A house southeast of Lewiston sustained significant wind damage.

Thunderstorm Wind, Winona

When
December 15, 8:11 PM CST
Where
Winona County, 1.21 mi SE of The Arches
Measured
57 kt (66 mph) estimated gust
Property damage
$50,000
Reported by
Public
Coordinates
43.990, -91.800

Two open air farm outbuildings were destroyed east of Lewiston.

Thunderstorm Wind, Winona

When
December 15, 8:12 PM CST
Where
Winona County, 2.11 mi WSW of Wilson
Measured
50 kt (58 mph) estimated gust
Property damage
$10,000
Reported by
Public
Coordinates
43.940, -91.740

Power poles were snapped southwest of Wilson.

Thunderstorm Wind, Winona

When
December 15, 8:12 PM CST to 8:16 PM CST
Where
Winona County, 5.23 mi SSW of Ridgeway to 2.11 mi ESE of Ridgeway
Measured
56 kt (64 mph) estimated gust
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
43.850, -91.610

A path of wind damage occurred from south of Ridgeway to near Interstate 90 east of Ridgeway. The roof was removed from a farm outbuilding and trees were uprooted and snapped off.

Thunderstorm Wind, Winona

When
December 15, 8:12 PM CST to 8:13 PM CST
Where
Winona County, 4.84 mi S of Ridgeway to 3.49 mi S of Ridgeway
Measured
57 kt (66 mph) estimated gust
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
43.850, -91.570

A path of wind damage occurred south of Ridgeway. The roof to a home was damaged and trees were snapped off.

Thunderstorm Wind, Winona

When
December 15, 8:14 PM CST
Where
Winona County, 1.38 mi N of Wilson
Measured
50 kt (58 mph) estimated gust
Property damage
$25,000
Reported by
Emergency Manager
Coordinates
43.970, -91.700

A semi was blown over on Interstate 90 near Wilson.

Thunderstorm Wind, Winona

When
December 15, 8:14 PM CST
Where
Winona County, Stockton
Measured
51 kt (59 mph) estimated gust
Property damage
$30,000
Reported by
Broadcast Media
Coordinates
44.030, -91.770

Farm outbuildings sustained wind damage near Stockton.

Thunderstorm Wind, Winona

When
December 15, 8:16 PM CST
Where
Winona County, 0.85 mi NE of Ridgeway
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.930, -91.560

Trees were snapped off northeast of Ridgeway.

Tornado, Winona

When
December 15, 8:17 PM CST to 8:19 PM CST
Where
Winona County, 1.7 mi SSW of Homer to 0.92 mi ENE of Homer
Rating
EF1
Path length
2.3 mi
Path width
40 yd
Continued into
Trempealeau, Wi (ARX)
Property damage
$100,000
Reported by
NWS Storm Survey
Coordinates
43.996, -91.580

An EF1 tornado formed on a ridge top southwest of Homer, moved northeast across Homer before moving out over the Mississippi River and into Trempealeau County, Wisconsin. The main damage occurred on the ridge top to trees and outbuildings. By the time the tornado reached Homer, it was weakening and damage was mainly limited to trees.

Thunderstorm Wind, Winona

When
December 15, 8:17 PM CST
Where
Winona County, 2.55 mi SW of Homer
Measured
57 kt (66 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.990, -91.600

Trees were snapped off southwest of Homer.

Thunderstorm Wind, Winona

When
December 15, 8:17 PM CST
Where
Winona County, 1.38 mi S of Homer
Measured
53 kt (61 mph) estimated gust
Property damage
$3,000
Reported by
NWS Storm Survey
Coordinates
44.000, -91.570

Trees were snapped off and uprooted south of Homer.

Thunderstorm Wind, Winona

When
December 15, 8:17 PM CST
Where
Winona County, 0.69 mi S of Pickwick
Measured
56 kt (64 mph) estimated gust
Property damage
$2,000
Reported by
NWS Storm Survey
Coordinates
43.970, -91.490

Trees were snapped off in Pickwick.

Thunderstorm Wind, Winona

When
December 15, 8:17 PM CST to 8:18 PM CST
Where
Winona County, 0.69 mi S of Pickwick to 0.69 mi S of Lamoille
Measured
56 kt (64 mph) estimated gust
Property damage
$5,000
Reported by
NWS Storm Survey
Coordinates
43.970, -91.490

A path of snapped off trees occurred near Pickwick.

Thunderstorm Wind, Winona

When
December 15, 8:17 PM CST
Where
Winona County, Winona
Measured
50 kt (58 mph) estimated gust
Property damage
$10,000
Reported by
Newspaper
Coordinates
44.050, -91.650

Trees and power poles were snapped off in Winona.

Thunderstorm Wind, Winona

When
December 15, 8:18 PM CST
Where
Winona County, 1.64 mi ESE of Lamoille
Measured
52 kt (60 mph) estimated gust
Property damage
$5,000
Reported by
Public
Coordinates
43.990, -91.450

Power outages were reported east of Pickwick from downed power lines.

Hail, Winona

When
December 15, 8:24 PM CST
Where
Winona County, 0.85 mi SE of Dakota
Measured
0.75 in hail
Reported by
Emergency Manager
Coordinates
43.910, -91.360

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Thunderstorm Wind, Olmsted2021-12-1565MaleUnder TreeDirect

What these are

Tornado
A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Funnel Cloud
A rotating column of cloud extending from a thunderstorm that did not reach the ground.
Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Minnesota in 2021Every state in 2021This day in weather historyThe tornado archive for Minnesota, 2021Warnings in Minnesota, December 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 995004, 997070, 997071, 997072, 997073, 995286, 995287, 997014, 995288, 995312, 995313, 995371, 995311, 997109, 995010, 995378, 997074, 995368, 997013, 997015, 997110, 999014, 995011, 995366, 995374, 997012, 995375, 995376, 995377, 997111, 997120, 997112, 997121, 997122, 995012, 997119, 997123, 995089, 995014, 995379, and more.