Alert archive / Minnesota / Mesoscale Discussions in 2025
Mesoscale Discussion 1908
The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2025, 2:40 AM CDT for 16 counties in Iowa; 44 counties in Minnesota; 9 counties in Wisconsin. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2025, 2:40 AM CDT (07:40 UTC)
- Expired
- Aug 9, 2025, 4:15 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 578
All 69 counties
Buena Vista County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Aitkin County, MN, Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carlton County, MN, Carver County, MN, Chisago County, MN, Cook County, MN, Cottonwood County, MN, Crow Wing County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Itasca County, MN, Jackson County, MN, Kanabec County, MN, Lake County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Mower County, MN, Nicollet County, MN, Pine County, MN, Ramsey County, MN, Renville County, MN, Rice County, MN, Saint Louis County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Barron County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Dunn County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI, Washburn County, WI
The radar
The Minneapolis radar (KMPX), 22 km from the middle of the area, began a volume at 07:40 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 7.7 hours before the alert went out and 24 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
- 4021 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 911 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
118 ACUS11 KWNS 090740 SWOMCD SPC MCD 090740 MNZ000-WIZ000-IAZ000-090915- Mesoscale Discussion 1908 NWS Storm Prediction Center Norman OK 0240 AM CDT Sat Aug 09 2025 Areas affected...portions of MN into northwest WI and IA Concerning...Severe Thunderstorm Watch 578... Valid 090740Z - 090915Z The severe weather threat for Severe Thunderstorm Watch 578 continues. SUMMARY...Isolated to widely scattered storms may produce strong to severe wind gusts into early morning across eastern portions of Minnesota, northwest Wisconsin, and portions of northern Iowa. DISCUSSION...Storms have modestly increased in coverage/intensity over the past 1-2 hours ahead of the east/southeast-advancing cold front. A very moist airmass beneath steep midlevel lapse rates is supporting a corridor of strong instability greater than 2500 J/kg. Stronger vertical shear lags somewhat behind the front across IA into southeast MN/northwest WI, but a 30-40 kt low-level jet is evident across the region. Convection has been somewhat slow to increase/organize, but will likely persist in the favorable thermodynamic environment as large-scale ascent continues to slowly overspread the Mid-MO/Upper MS Valleys into early morning. Damaging wind gusts will be the main hazard with this activity, though isolated large hail is possible with any more discrete cellular activity. Severe Thunderstorm Watch 578 is set to expire at 09z. Given convection is likely to persist, a local watch extension or a new watch issuance is possible for parts of the MCD area. ..Leitman.. 08/09/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DLH...ARX...MPX...DMX...FSD... LAT...LON 42509608 48589323 48238987 45549139 42559354 42509608 MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 9:34 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 3 more | 8 hr |
| Aug 8, 11:25 PM CDT | Mesoscale Discussion | SPC | Dickinson, Emmet, Lyon, Osceola | 2 hr |
| Aug 9, 2:17 AM CDT | Severe Thunderstorm Watch | SPC | Harrison, Mills, Monona, Pottawattamie, Shelby | 5 hr |
| Aug 9, 5:31 AM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Cass and 21 more | 89 min |
| Aug 9, 6:04 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Cass and 23 more | 5 hr |
| Aug 9, 7:29 AM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Bremer, Butler, Calhoun and 30 more | 2 hr |
| Aug 9, 10:03 AM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 87 min |
| Aug 9, 2:54 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Davis, Des Moines, Henry, Jefferson and 5 more | 96 min |
| Aug 8, 8:39 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Brown, Carlton, Carver and 44 more | 2 hr |
Nearby
Mesoscale Discussions in Minnesota, 2025Mesoscale Discussions in Iowa, 2025Mesoscale Discussions in Wisconsin, 2025Every mesoscale discussion in 2025
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.