Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 705
The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2011, 5:31 PM CDT for 47 counties in Minnesota; Richland County, Sargent County, North Dakota; 12 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2011, 5:31 PM CDT (22:31 UTC)
- Expired
- Jul 31, 2011, 12:20 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 61 counties
Aitkin County, MN, Anoka County, MN, Benton County, MN, Big Stone County, MN, Brown County, MN, Carlton County, MN, Carver County, MN, Cass County, MN, Chippewa County, MN, Chisago County, MN, Crow Wing County, MN, Dakota County, MN, Douglas County, MN, Grant County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Washington County, MN, Wilkin County, MN, Wright County, MN, Yellow Medicine County, MN, Richland County, ND, Sargent County, ND, Beadle County, SD, Brookings County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 197 km from the middle of the area, began a volume at 22:31 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:58 PM CDT | Tornado Warning | FGF | Otter Tail | 32 min |
| Jul 30, 6:04 PM CDT | Severe Thunderstorm Warning | DLH | Aitkin, Crow Wing | 56 min |
| Jul 30, 6:06 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 54 min |
| Jul 30, 6:17 PM CDT | Tornado Warning | DLH | Aitkin, Crow Wing | 43 min |
| Jul 30, 6:22 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 53 min |
| Jul 30, 6:54 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 51 min |
| Jul 30, 6:55 PM CDT | Tornado Warning | DLH | Aitkin, Crow Wing | 30 min |
| Jul 30, 6:58 PM CDT | Severe Thunderstorm Warning | MPX | Mille Lacs, Morrison | 62 min |
| Jul 30, 7:10 PM CDT | Tornado Warning | MPX | Todd | 50 min |
| Jul 30, 7:14 PM CDT | Tornado Warning | ABR | Big Stone, Traverse | 31 min |
| Jul 30, 7:15 PM CDT | Severe Thunderstorm Warning | MPX | Douglas | 30 min |
| Jul 30, 7:42 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 63 min |
| Jul 30, 7:45 PM CDT | Severe Thunderstorm Warning | MPX | Kanabec | 45 min |
| Jul 30, 8:01 PM CDT | Severe Thunderstorm Warning | MPX | Kanabec, Mille Lacs | 29 min |
| Jul 30, 8:15 PM CDT | Severe Thunderstorm Warning | MPX | Stearns | 60 min |
| Jul 30, 8:18 PM CDT | Severe Thunderstorm Warning | MPX | Isanti, Kanabec, Mille Lacs | 72 min |
| Jul 30, 8:22 PM CDT | Tornado Warning | MPX | Isanti, Kanabec, Mille Lacs | 38 min |
| Jul 30, 8:50 PM CDT | Severe Thunderstorm Warning | MPX | Isanti | 55 min |
| Jul 30, 8:53 PM CDT | Tornado Warning | MPX | Isanti | 35 min |
| Jul 30, 9:07 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Meeker, Stearns | 38 min |
| Jul 30, 9:20 PM CDT | Severe Thunderstorm Warning | MPX | Anoka | 55 min |
| Jul 30, 9:50 PM CDT | Severe Thunderstorm Warning | MPX | Ramsey, Washington | 55 min |
| Jul 30, 10:21 PM CDT | Severe Thunderstorm Warning | MPX | Anoka | 39 min |
| Jul 30, 11:26 PM CDT | Severe Thunderstorm Warning | MPX | Le Sueur, Scott, Sibley | 31 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 12:00Z, 10.5 hours before the alert went out and 197 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
- 2252 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 813 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:47 AM CDT | Mesoscale Discussion | SPC | Big Stone, Brown, Chippewa, Kandiyohi, Lac qui Parle, Lincoln and 9 more | 88 min |
| Jul 30, 11:28 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Brown, Carver, Chippewa, Chisago and 24 more | 3 hr |
| Jul 30, 1:28 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 32 more | 112 min |
| Jul 30, 3:22 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Big Stone, Blue Earth, Brown, Carver and 38 more | 53 min |
| Jul 29, 9:06 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Emmons, Grant, Hettinger, McIntosh and 2 more | 54 min |
| Jul 29, 10:14 PM CDT | Mesoscale Discussion | SPC | Billings, Bottineau, Burke, Burleigh, Divide, Dunn and 12 more | 61 min |
| Jul 29, 11:52 PM CDT | Mesoscale Discussion | SPC | Barnes, Benson, Billings, Bottineau, Burleigh, Dickey and 23 more | 83 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.