Alert archive / Minnesota / Mesoscale Discussions in 2017
Mesoscale Discussion 1661
The Storm Prediction Center issued this mesoscale discussion at Sep 20, 2017, 1:03 AM CDT for 24 counties in Minnesota. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2017, 1:03 AM CDT (06:03 UTC)
- Expired
- Sep 20, 2017, 2:30 AM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 24 counties
Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Hennepin County, MN, Isanti County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Waseca County, MN, Watonwan County, MN, Wright County, MN
The radar
The Minneapolis radar (KMPX), 53 km from the middle of the area, began a volume at 06:07 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, 6.1 hours before the alert went out and 51 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
- 246 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 1179 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 274 m²/s²
- 0-3 km storm-relative helicity
- 454 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 8:56 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Clearwater, Grant, Kittson and 12 more | 2 hr |
| Sep 19, 10:10 PM CDT | Mesoscale Discussion | SPC | Benton, Blue Earth, Brown, Carver, Cass, Chippewa and 37 more | 35 min |
| Sep 19, 10:36 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Benton, Brown, Cass, Chippewa and 30 more | 4 hr |
| Sep 20, 1:22 AM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Carlton, Carver, Chisago, Hennepin and 8 more | 4 hr |
Nearby
Mesoscale Discussions in Minnesota, 2017Every mesoscale discussion in 2017
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.