Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 799
The Storm Prediction Center issued this severe thunderstorm watch at Aug 23, 2011, 3:34 AM CDT for 40 counties in Minnesota. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 23, 2011, 3:34 AM CDT (08:34 UTC)
- Expired
- Aug 23, 2011, 8:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 40 counties
Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle 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, 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, Swift County, MN, Todd County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN
The radar
The Minneapolis radar (KMPX), 87 km from the middle of the area, began a volume at 08:35 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
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 3:38 AM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Kandiyohi, Lac qui Parle, Meeker, Pope, Stearns and 2 more | 56 min |
| Aug 23, 4:04 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, McLeod, Meeker, Renville, Stearns, Yellow Medicine | 56 min |
| Aug 23, 5:12 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Carver, Hennepin, Wright | 46 min |
| Aug 23, 5:30 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Dakota, Ramsey | 46 min |
| Aug 23, 6:12 AM CDT | Severe Thunderstorm Warning | MPX | Faribault | 33 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, 8.6 hours before the alert went out and 85 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
- 114 J/kg
- Mixed-layer CIN
- -258 J/kg
- Mixed-layer LCL
- 1559 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 12:45 AM CDT | Mesoscale Discussion | SPC | Cottonwood, Faribault, Jackson, Martin, Nobles | 2 hr |
| Aug 23, 3:00 AM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 6 hr |
| Aug 23, 3:10 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chippewa, Chisago, Hennepin and 21 more | 2 hr |
| Aug 23, 4:55 AM CDT | Mesoscale Discussion | SPC | Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 28 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 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.