Alert archive / Wisconsin / Mesoscale Discussions in 2021
Mesoscale Discussion 1589
The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2021, 6:00 AM CDT for 4 states. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2021, 6:00 AM CDT (11:00 UTC)
- Expired
- Aug 24, 2021, 7:30 AM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
- Concerning
- Outlook upgrade
All 56 counties
Allamakee County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Jo Daviess County, IL, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Eau Claire County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Pepin County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 22 km from the middle of the area, began a volume at 11:01 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, 11.0 hours before the alert went out and 219 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
- 501 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 1780 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
677
ACUS11 KWNS 241101
SWOMCD
SPC MCD 241100
WIZ000-ILZ000-IAZ000-MNZ000-241230-
Mesoscale Discussion 1589
NWS Storm Prediction Center Norman OK
0600 AM CDT Tue Aug 24 2021
Areas affected...Portions of southeastern MN...western/southern
WI...northeastern IA...and far northern IL
Concerning...Outlook upgrade
Valid 241100Z - 241230Z
SUMMARY...An upgrade to Slight Risk will be made with the next
update to the Day 1 Convective Outlook across parts of southeastern
Minnesota, western/southern Wisconsin, northeastern Iowa, and far
northern Illinois. Severe/damaging winds are the main concern.
DISCUSSION...A well-organized MCS is expected to continue moving
east-southeastward across MN this morning. A favorable environment
for maintaining storm organization and intensity should be present
downstream of this MCS through much of the day. Given the potential
for scattered severe/damaging winds to persist with the ongoing MCS
this morning, and with potential redevelopment of intense convection
later today on its southern flank and/or related outflow boundaries,
an upgrade to Slight Risk appears warranted with the next update.
Additional meteorological details will be provided in the upcoming
Day 1 Convective Outlook.
..Gleason/Thompson.. 08/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...LOT...MKX...DVN...ARX...MPX...DMX...
LAT...LON 43069321 43519451 43969438 44069354 44269256 44629211
44959210 44729047 44058854 43568797 43008799 42488844
42309037 43069321SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside | 5 hr |
| Aug 24, 3:09 PM CDT | Mesoscale Discussion | SPC | Boone, McHenry, Ogle, Stephenson, Winnebago | 66 min |
| Aug 24, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 5 hr |
| Aug 24, 5:10 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, DeKalb, DuPage, Jo Daviess, Kane and 7 more | 2 hr |
| Aug 24, 12:44 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Butler, Chickasaw, Clayton, Fayette and 4 more | 91 min |
| Aug 24, 1:10 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chippewa, Dakota, Douglas and 26 more | 95 min |
| Aug 24, 2:17 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Big Stone, Brown, Carver, Chippewa and 34 more | 7 hr |
| Aug 24, 3:00 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Big Stone, Brown, Carver, Chippewa and 35 more | 2 hr |
| Aug 24, 5:00 AM CDT | Mesoscale Discussion | SPC | Anoka, Carver, Dakota, Hennepin, Kandiyohi, McLeod and 8 more | 90 min |
| Aug 24, 7:10 AM CDT | Mesoscale Discussion | SPC | Blue Earth, Chisago, Dakota, Dodge, Fillmore, Freeborn and 13 more | 95 min |
| Aug 24, 9:13 AM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Menominee, Oconto, Outagamie, Shawano and 3 more | 62 min |
Nearby
Mesoscale Discussions in Wisconsin, 2021Mesoscale Discussions in Iowa, 2021Mesoscale Discussions in Minnesota, 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.