Alert archive / Minnesota / Mesoscale Discussions in 2018
Mesoscale Discussion 1049
The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2018, 9:39 PM CDT for Dickinson County, Lyon County, Osceola County, Iowa; 19 counties in Minnesota; 19 counties in Wisconsin. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jul 12, 2018, 9:39 PM CDT (02:39 UTC)
- Expired
- Jul 12, 2018, 11:15 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 41 counties
Dickinson County, IA, Lyon County, IA, Osceola County, IA, Blue Earth 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, Nobles County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Clark County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Marathon County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Portage County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Waupaca County, WI, Waushara County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 61 km from the middle of the area, began a volume at 02:43 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, 2.7 hours before the alert went out and 163 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
- 487 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 876 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -75 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
062
ACUS11 KWNS 130240
SWOMCD
SPC MCD 130239
WIZ000-MNZ000-IAZ000-SDZ000-130415-
Mesoscale Discussion 1049
NWS Storm Prediction Center Norman OK
0939 PM CDT Thu Jul 12 2018
Areas affected...southern MN into central WI
Concerning...Severe Thunderstorm Watch 274...275...
Valid 130239Z - 130415Z
The severe weather threat for Severe Thunderstorm Watch 274, 275
continues.
SUMMARY...A few strong wind gusts may be possible for another hour
or two as gradual weakening trend ensues this evening. Additional
downstream watches are not expected.
DISCUSSION...Portions of the line of storms tracking east/southeast
across western into central WI have weakened this evening. Embedded
cells occasionally have increased in intensity, but overall trends
suggest storms are struggling to maintain intensity as boundary
layer stabilization continues due to loss of heating and as storms
shift away from stronger deep layer shear. While some strong gusts
may persist another hour or two, downstream watches are not expected
and existing watch may be canceled prior to expiration.
..Leitman.. 07/13/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...MKX...ARX...MPX...DMX...FSD...
LAT...LON 43539174 43309620 43389656 43759617 45349011 45238885
44778859 44168887 43658986 43539174SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 12:41 PM CDT | Mesoscale Discussion | SPC | Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Chickasaw and 16 more | 94 min |
| Jul 13, 3:54 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Buchanan, Chickasaw, Clayton, Delaware, Dubuque and 3 more | 6 hr |
| Jul 13, 6:23 PM CDT | Mesoscale Discussion | SPC | Clinton, Delaware, Dubuque, Jackson, Jones | 2 hr |
| Jul 12, 7:35 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 18 more | 85 min |
| Jul 12, 8:14 PM CDT | Severe Thunderstorm Watch | SPC | Langlade, Lincoln, Marathon, Menominee, Portage, Shawano and 3 more | 2 hr |
Nearby
Mesoscale Discussions in Minnesota, 2018Mesoscale Discussions in Wisconsin, 2018Mesoscale Discussions in Iowa, 2018Every mesoscale discussion in 2018
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.