Alert archive / Wisconsin / Mesoscale Discussions in 2021
Mesoscale Discussion 1949
The Storm Prediction Center issued this mesoscale discussion at Nov 21, 2021, 1:36 PM CST for Dickinson County, Menominee County, Michigan; 21 counties in Wisconsin. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 21, 2021, 1:36 PM CST (19:36 UTC)
- Expired
- Nov 21, 2021, 4:30 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Snow squall
All 23 counties
Dickinson County, MI, Menominee County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 89 km from the middle of the area, began a volume at 19:39 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.6 hours before the alert went out and 91 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
- 1176 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 191 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
162
ACUS11 KWNS 211936
SWOMCD
SPC MCD 211936
MIZ000-WIZ000-212230-
Mesoscale Discussion 1949
NWS Storm Prediction Center Norman OK
0136 PM CST Sun Nov 21 2021
Areas affected...Northeast Wisconsin
Concerning...Snow Squall
Valid 211936Z - 212230Z
SUMMARY...Scattered snow showers will continue across portions of
northeast Wisconsin this afternoon. Strong winds accompanying these
snow showers may result in visibility dropping to less than a
quarter-mile at times.
DISCUSSION...Atmospheric response to strong frontogenesis in the
850-700 millibar layer is supporting bands of snow showers across
northeast Wisconsin. These snow bands are occurring within a region
of strong winds, gusting to between 35 and 45 mph at times. The
combination of intense snow bands and strong gusty winds will result
in visibility briefly falling to around or below a quarter-mile at
times. The threat should end later this afternoon as frontogenetic
forcing continues to progress through the region.
..Marsh.. 11/21/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MQT...GRB...MKX...ARX...
LAT...LON 45698980 46108896 46068796 45618690 44388725 43878808
44019094 45698980Nearby
Mesoscale Discussions in Wisconsin, 2021Mesoscale Discussions in Michigan, 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.