Alert archive / Iowa / Winter Weather Advisories in 2021

Winter Weather Advisory 13, NWS La Crosse, WI

December 9, 20214 counties in Wisconsin; 6 counties in Minnesota; 8 counties in Iowa

NWS La Crosse, WI issued this winter weather advisory at Dec 9, 2021, 5:23 AM CST for 4 counties in Wisconsin; 6 counties in Minnesota; 8 counties in Iowa. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 9, 2021, 5:23 AM CST (11:23 UTC)
Expired
Dec 9, 2021, 9:00 AM CST
In force
4 hr
Issued by
NWS La Crosse, WI

Counties Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Winona County, MN, Crawford County, WI, Grant County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 69 km from the middle of the area, began a volume at 11:22 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.4 hours before the alert went out and 214 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2021-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2021-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 199 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1481 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
199 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

762 
WWUS43 KARX 091123
WSWARX

URGENT - WINTER WEATHER MESSAGE
National Weather Service La Crosse WI
523 AM CST Thu Dec 9 2021

IAZ008>011-018-019-MNZ086>088-094>096-WIZ053>055-091930-
/O.NEW.KARX.WW.Y.0013.211209T1123Z-211209T1500Z/
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Dodge-
Olmsted-Winona-Mower-Fillmore-Houston-Vernon-Crawford-Richland-
Including the cities of Osage, Cresco, Decorah, Waukon, 
Charles City, New Hampton, Dodge Center, Rochester, Winona, 
Austin, Preston, Caledonia, Viroqua, Prairie Du Chien, 
and Richland Center
523 AM CST Thu Dec 9 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM CST THIS
MORNING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...

* WHAT...For the Winter Weather Advisory,a mix of freezing rain,
  sleet and snow transitioning to all snow. Snow accumulations a 
  trace to one inch. For the Winter Storm Watch, heavy snow 
  possible. Total snow accumulations of 5 to 12 inches possible.

* WHERE...Portions of southwest Wisconsin, north central and 
  northeast Iowa and southeast Minnesota.

* WHEN...For the Winter Weather Advisory, until 9 AM CST this 
  morning. For the Winter Storm Watch, from Friday afternoon 
  through late Friday night.

* IMPACTS...This morning, roads may become slippery. For Friday
  night, travel could be very difficult. The hazardous conditions
  could impact the morning or evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

Monitor the latest forecasts for updates on this situation. 

For the latest road conditions, check 511ia.org in Iowa,
511mn.org in Minnesota, and 511wi.gov in Wisconsin.

&&

$$

IAZ029-030-WIZ061-091500-
/O.NEW.KARX.WW.Y.0013.211209T1123Z-211209T1500Z/
Fayette-Clayton-Grant-
Including the cities of Oelwein, Elkader, and Platteville
523 AM CST Thu Dec 9 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 AM CST THIS
MORNING...

* WHAT...A mix of freezing rain, sleet and snow. A light glaze of
  ice. Snow accumulations a trace to one inch.

* WHERE...In Wisconsin, Grant County. In Iowa, Fayette and 
  Clayton Counties.

* WHEN...Until 9 AM CST this morning.

* IMPACTS...This morning, roads may become slippery. For Friday
  night, travel could be very difficult. The hazardous conditions
  could impact the morning or evening commute.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For the latest road conditions, check 511ia.org in Iowa,
511mn.org in Minnesota, and 511wi.gov in Wisconsin.

&&

$$

MNZ079-WIZ017-029-032>034-041>044-091930-
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Wabasha-Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-
Juneau-Adams-
Including the cities of Wabasha, Medford, Neillsville, Alma, 
Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah, 
Mauston, and Friendship
523 AM CST Thu Dec 9 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 
  12 inches possible.

* WHERE...Portions of central, north central and west central 
  Wisconsin and southeast Minnesota.

* WHEN...From Friday afternoon through late Friday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

Zapotocny
2 follow-up statements
497 
WWUS43 KARX 091429
WSWARX

URGENT - WINTER WEATHER MESSAGE
National Weather Service La Crosse WI
829 AM CST Thu Dec 9 2021

...Wintry Mix Causing Some Slick Roads This Morning...

.A wintry mix continues to shift through the area and roads are
slick and crashes have been reported by the Department of 
Transportation in Minnesota and Iowa. Freezing rain is now 
changing over to sleet and snow in many areas. The precipitation 
will be finished by 10 am in Minnesota and Iowa.

Mainly sleet and snow will fall through early afternoon in  
Wisconsin, however a brief period of freezing rain could occur and
make roads slick. 

IAZ008>011-018-019-MNZ086>088-094>096-WIZ053>055-092230-
/O.CON.KARX.WW.Y.0013.000000T0000Z-211209T1500Z/
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Dodge-
Olmsted-Winona-Mower-Fillmore-Houston-Vernon-Crawford-Richland-
Including the cities of Osage, Cresco, Decorah, Waukon, 
Charles City, New Hampton, Dodge Center, Rochester, Winona, 
Austin, Preston, Caledonia, Viroqua, Prairie Du Chien, 
and Richland Center
829 AM CST Thu Dec 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS
MORNING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...

* WHAT...For the Winter Weather Advisory,a mix of freezing rain, 
  sleet and snow transitioning to all snow. Snow accumulations a 
  trace to one inch. For the Winter Storm Watch, heavy snow 
  possible. Total snow accumulations of 5 to 12 inches possible.

* WHERE...Portions of southwest Wisconsin, north central and 
  northeast Iowa and southeast Minnesota.

* WHEN...For the Winter Weather Advisory, until 9 AM CST this 
  morning. For the Winter Storm Watch, from Friday afternoon 
  through late Friday night.

* IMPACTS...This morning, roads may become slippery. For Friday 
  night, travel could be very difficult. The hazardous 
  conditions could impact the morning or evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

Monitor the latest forecasts for updates on this situation. 

For the latest road conditions, check 511ia.org in Iowa,
511mn.org in Minnesota, and 511wi.gov in Wisconsin.

&&

$$

IAZ029-030-WIZ061-091530-
/O.CON.KARX.WW.Y.0013.000000T0000Z-211209T1500Z/
Fayette-Clayton-Grant-
Including the cities of Oelwein, Elkader, and Platteville
829 AM CST Thu Dec 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS
MORNING...

* WHAT...A mix of freezing rain, sleet and snow. A light glaze 
  of ice. Snow accumulations a trace to one inch.

* WHERE...In Wisconsin, Grant County. In Iowa, Fayette and 
  Clayton Counties.

* WHEN...Until 9 AM CST this morning.

* IMPACTS...This morning, roads may become slippery. For Friday 
  night, travel could be very difficult. The hazardous 
  conditions could impact the morning or evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

For the latest road conditions, check 511ia.org in Iowa,
511mn.org in Minnesota, and 511wi.gov in Wisconsin.

&&

$$

MNZ079-WIZ017-029-032>034-041>044-092230-
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Wabasha-Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-
Juneau-Adams-
Including the cities of Wabasha, Medford, Neillsville, Alma, 
Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah, 
Mauston, and Friendship
829 AM CST Thu Dec 9 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 
  12 inches possible.

* WHERE...Portions of central, north central and west central 
  Wisconsin and southeast Minnesota.

* WHEN...From Friday afternoon through late Friday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$
462 
WWUS43 KARX 091459
WSWARX

URGENT - WINTER WEATHER MESSAGE
National Weather Service La Crosse WI
859 AM CST Thu Dec 9 2021

...The Threat for Additional Freezing Rain Has Passed...

.A wintry mix, including freezing rain and light icing, affected 
the area early this morning. Over the next hours, the 
precipitation will end if it has not already, and thus the threat 
for additional hazardous weather is ending. 

Some roads may still be slick, especially those untreated and less
traveled. 

The snow storm for Friday still looks on track with the heaviest
snows north and west of La Crosse, Wisconsin. 

IAZ008>011-018-019-MNZ086>088-094>096-WIZ053>055-092300-
/O.EXP.KARX.WW.Y.0013.000000T0000Z-211209T1500Z/
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Dodge-
Olmsted-Winona-Mower-Fillmore-Houston-Vernon-Crawford-Richland-
Including the cities of Osage, Cresco, Decorah, Waukon, 
Charles City, New Hampton, Dodge Center, Rochester, Winona, 
Austin, Preston, Caledonia, Viroqua, Prairie Du Chien, 
and Richland Center
859 AM CST Thu Dec 9 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 AM CST THIS MORNING...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 12 
  inches possible.

* WHERE...Portions of southwest Wisconsin, north central and 
  northeast Iowa and southeast Minnesota.

* WHEN...Friday afternoon through late Friday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the morning or evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

IAZ029-030-WIZ061-091600-
/O.EXP.KARX.WW.Y.0013.000000T0000Z-211209T1500Z/
Fayette-Clayton-Grant-
Including the cities of Oelwein, Elkader, and Platteville
859 AM CST Thu Dec 9 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 AM CST THIS MORNING...

Precipitation will be ending and conditions improving.

$$

MNZ079-WIZ017-029-032>034-041>044-092300-
/O.CON.KARX.WS.A.0005.211210T1800Z-211211T1200Z/
Wabasha-Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-
Juneau-Adams-
Including the cities of Wabasha, Medford, Neillsville, Alma, 
Arcadia, Whitehall, Black River Falls, La Crosse, Sparta, Tomah, 
Mauston, and Friendship
859 AM CST Thu Dec 9 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH LATE FRIDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 
  12 inches possible.

* WHERE...Portions of central, north central and west central 
  Wisconsin and southeast Minnesota.

* WHEN...From Friday afternoon through late Friday night.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$
Baumgardt

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 9, 11:41 AM CSTWinter Storm WarningARXAdams, Buffalo, Clark, Jackson, Juneau, La Crosse and 4 more45 hr
Dec 9, 1:50 PM CSTWinter Weather AdvisoryARXAdams, Crawford, Juneau, La Crosse, Monroe, Richland and 1 more43 hr

Nearby

Winter Weather Advisories in Iowa, 2021Winter Weather Advisories in Minnesota, 2021Winter Weather Advisories in Wisconsin, 2021Every winter weather advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.