Alert archive / South Dakota / Mesoscale Discussions in 2021
Mesoscale Discussion 919
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2021, 4:37 AM CDT for 12 counties in Minnesota; 14 counties in North Dakota; 27 counties in South Dakota. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2021, 4:37 AM CDT (09:37 UTC)
- Expired
- Jun 11, 2021, 6:00 AM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 255...256
All 53 counties
Big Stone County, MN, Clay County, MN, Grant County, MN, Kittson County, MN, Lac qui Parle County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Cavalier County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Walsh County, ND, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brown County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Turner County, SD
The radar
The Aberdeen radar (KABR), 107 km from the middle of the area, began a volume at 09:38 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
Aberdeen, SD (KABR), launched 00:00Z, 9.6 hours before the alert went out and 164 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
- 1337 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 2725 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted.
864
ACUS11 KWNS 110937
SWOMCD
SPC MCD 110937
MNZ000-SDZ000-NDZ000-111100-
Mesoscale Discussion 0919
NWS Storm Prediction Center Norman OK
0437 AM CDT Fri Jun 11 2021
Areas affected...eastern North Dakota/South Dakota and western
Minnesota
Concerning...Severe Thunderstorm Watch 255...256...
Valid 110937Z - 111100Z
The severe weather threat for Severe Thunderstorm Watch 255, 256
continues.
SUMMARY...Severe thunderstorms capable of damaging gusts will
continue the next couple of hours across the eastern Dakotas into
portions of western Minnesota.
DISCUSSION...A severe QLCS will continue to track eastward across
the eastern Dakotas at around 40-50 kt early this morning. Several
severe wind gusts around 60-80 mph have been measured over the past
hour or so with this line. Recent VWP data from ABR, where the line
recently passed, indicated a rear inflow jet around 60-70 kt around
2 km. While the QLCS is currently exiting the axis of greatest
instability, this strong rear inflow jet, and a southerly low level
jet around 30-40 kts ahead of the line will help to maintain strong
to severe storms for another couple hours as convection approaches
western MN. The current expectation is that convection should
gradually diminish in intensity with eastward extent as instability
and shear weak across western MN. While new downstream severe
thunderstorm watches are not anticipated at this time, local watch
extensions may be needed for parts of the Grand Forks and/or
Aberdeen CWAs depending on convective trends over the next hour or
so.
..Leitman.. 06/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MPX...FGF...FSD...ABR...BIS...
LAT...LON 49079697 48079591 46469578 44049639 43029745 42969828
43289877 43979887 46259841 47959887 48759928 49109909
49079697SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 1:58 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Norman, Polk, Wilkin | 5 hr |
| Jun 11, 2:15 AM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Traverse | 5 hr |
| Jun 11, 9:35 AM CDT | Mesoscale Discussion | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Le Sueur and 8 more | 115 min |
| Jun 11, 11:34 AM CDT | Mesoscale Discussion | SPC | Dakota, Dodge, Fillmore, Goodhue, Houston, Olmsted and 3 more | 116 min |
| Jun 10, 8:30 PM CDT | Mesoscale Discussion | SPC | Billings, Burke, Divide, Golden Valley, McKenzie, Mountrail and 1 more | 2 hr |
| Jun 10, 9:54 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bottineau, Bowman, Burke, Burleigh and 24 more | 5 hr |
| Jun 10, 11:07 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Grant, Hettinger, Slope, Stark | 83 min |
| Jun 10, 11:21 PM CDT | Mesoscale Discussion | SPC | Bottineau, Burke, Divide, McHenry, McKenzie, Mountrail and 3 more | 114 min |
| Jun 11, 12:52 AM CDT | Mesoscale Discussion | SPC | Barnes, Benson, Cass, Cavalier, Dickey, Eddy and 17 more | 53 min |
| Jun 10, 8:28 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Corson, Custer, Dewey, Fall River and 17 more | 92 min |
| Jun 10, 9:08 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Campbell, Corson, Custer, Dewey and 20 more | 6 hr |
| Jun 10, 11:50 PM CDT | Mesoscale Discussion | SPC | Dewey, Haakon, Jackson, Jones, Meade, Mellette and 5 more | 85 min |
Nearby
Mesoscale Discussions in South Dakota, 2021Mesoscale Discussions in North Dakota, 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.