Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 704
The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2011, 1:28 PM CDT for 38 counties in Minnesota; 11 counties in South Dakota. It was in force for 112 min.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2011, 1:28 PM CDT (18:28 UTC)
- Expired
- Jul 30, 2011, 3:20 PM CDT
- In force
- 112 min
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 49 counties
Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Cottonwood County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Isanti 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, Murray County, MN, Nicollet County, MN, Pipestone 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, Steele County, MN, Stevens County, MN, Swift County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Brookings County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 154 km from the middle of the area, began a volume at 18:31 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 80%
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, 6.5 hours before the alert went out and 182 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, 3:22 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Big Stone, Blue Earth, Brown, Carver and 38 more | 53 min |
| Jul 30, 5:31 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 41 more | 7 hr |
| Jul 29, 9:06 PM CDT | Mesoscale Discussion | SPC | Campbell, Corson, Dewey, Haakon, Harding, Hughes and 8 more | 54 min |
| Jul 29, 11:52 PM CDT | Mesoscale Discussion | SPC | Brown, Edmunds, McPherson, Marshall | 83 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2011Severe Thunderstorm Watches in South 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.