Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 401
The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2011, 4:05 AM CDT for 25 counties in Minnesota; Ransom County, Richland County, Sargent County, North Dakota; 4 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 30, 2011, 4:05 AM CDT (09:05 UTC)
- Expired
- May 30, 2011, 9:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 50 kt
All 32 counties
Benton County, MN, Big Stone County, MN, Chippewa County, MN, Chisago County, MN, Douglas County, MN, Grant County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN, Wright County, MN, Ransom County, ND, Richland County, ND, Sargent County, ND, Day County, SD, Grant County, SD, Marshall County, SD, Roberts County, SD
The radar
The Aberdeen radar (KABR), 201 km from the middle of the area, began a volume at 09:09 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 10%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 4:38 AM CDT | Severe Thunderstorm Warning | ABR | Big Stone, Traverse | 20 min |
| May 30, 4:51 AM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Renville, Sibley, Wright | 54 min |
| May 30, 6:03 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Meeker | 42 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 9.1 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2019 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 167 m²/s²
- 0-3 km storm-relative helicity
- 532 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 10:58 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Chippewa, Cottonwood, Jackson, Kandiyohi, Lac qui Parle and 16 more | 6 hr |
| May 30, 2:52 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Big Stone, Blue Earth, Brown, Carver and 30 more | 113 min |
| May 30, 6:51 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carlton, Chisago, Hennepin, Isanti and 9 more | 114 min |
| May 30, 1:40 PM CDT | Mesoscale Discussion | SPC | Big Stone, Lac qui Parle, Lincoln, Pipestone, Traverse | 95 min |
| May 30, 2:08 PM CDT | Tornado Watch | SPC | Lincoln, Lyon, Pipestone, Rock | 7 hr |
| May 30, 3:52 PM CDT | Tornado Watch | SPC | Becker, Benton, Big Stone, Cass, Chippewa, Clay and 25 more | 7 hr |
| May 30, 6:17 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Chippewa, Clay, Douglas, Grant and 22 more | 118 min |
| May 29, 9:24 PM CDT | Mesoscale Discussion | SPC | Clay, Union | 96 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2011Severe Thunderstorm Watches in South Dakota, 2011Severe Thunderstorm Watches in North Dakota, 2011Every severe thunderstorm watch in 2011
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.