Alert archive / Minnesota / Mesoscale Discussions in 2021
Mesoscale Discussion 1980
The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2021, 3:31 PM CST for 8 counties in Iowa; 26 counties in Minnesota; 8 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 10, 2021, 3:31 PM CST (21:31 UTC)
- Expired
- Dec 10, 2021, 7:30 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Heavy snow
All 42 counties
Clay County, IA, Dickinson County, IA, Emmet County, IA, Kossuth County, IA, Lyon County, IA, Osceola County, IA, Winnebago County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Buffalo County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Pepin County, WI, Pierce County, WI, Trempealeau County, WI
The radar
The Minneapolis radar (KMPX), 88 km from the middle of the area, began a volume at 21:32 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 12:00Z, 9.5 hours before the alert went out and 88 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
- 1610 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- -94 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
847
ACUS11 KWNS 102132
SWOMCD
SPC MCD 102131
WIZ000-MNZ000-IAZ000-110130-
Mesoscale Discussion 1980
NWS Storm Prediction Center Norman OK
0331 PM CST Fri Dec 10 2021
Areas affected...Far Northern IA....West-Central WI...Southern MN
Concerning...Heavy snow
Valid 102131Z - 110130Z
SUMMARY...A band of heavy snowfall, with rates around 1" to 2" per
hour, is expected to develop from far northern IA across southern MN
into west-central WI.
DISCUSSION...Recent regional radar imagery and surface observations
continue to show predominantly moderate snowfall from far southwest
MN into far northwest IA. This radar imagery also depicts the
western branch of the warm conveyor well, shown by the band of
precipitation from southern MN southeastward through northern IL.
Expectation is for the ongoing snowfall band to further
consolidate/organize during the next few hours, with the persistent
warm-air advection contributing to an increase in snowfall rates.
Lift across this region will be augmented by large-scale ascent,
resulting in robust lift throughout the dendritic growth zone. A
band of heavy snowfall is anticipated as result, with rates around
1-2" per hour likely into the evening.
..Mosier.. 12/10/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...ARX...MPX...DMX...FSD...
LAT...LON 44099585 44699398 45019178 44599043 43699100 43049534
43429648 44099585SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 12:27 PM CST | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Lyon, O'Brien, Osceola and 1 more | 4 hr |
Nearby
Mesoscale Discussions in Minnesota, 2021Mesoscale Discussions in Iowa, 2021Mesoscale Discussions in Wisconsin, 2021Every mesoscale discussion 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.