Alert archive / Minnesota / Tornado Watches in 2010
Tornado Watch 586
The Storm Prediction Center issued this tornado watch at Aug 7, 2010, 11:59 PM CDT for 18 counties in Minnesota; 9 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2010, 11:59 PM CDT (04:59 UTC)
- Expired
- Aug 8, 2010, 3:50 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 27 counties
Anoka County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Hennepin County, MN, Isanti County, MN, Kandiyohi County, MN, McLeod County, MN, Meeker County, MN, Ramsey County, MN, Renville County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Swift County, MN, Washington County, MN, Wright County, MN, Barron County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 59 km from the middle of the area, began a volume at 04:59 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| Aug 8, 12:18 AM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Rusk | 42 min |
| Aug 8, 12:47 AM CDT | Severe Thunderstorm Warning | MPX | Washington | 43 min |
| Aug 8, 1:43 AM CDT | Severe Thunderstorm Warning | MPX | Washington | 32 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, 5.0 hours before the alert went out and 58 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
- 2210 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1185 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 12.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 8:57 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Becker, Benton, Carver, Cass and 33 more | 93 min |
| Aug 7, 9:16 PM CDT | Severe Thunderstorm Watch | SPC | Carlton | 8 hr |
| Aug 7, 10:39 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Carlton, Chisago, Crow Wing and 13 more | 2 hr |
| Aug 8, 2:25 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chisago, Dakota, Dodge and 20 more | 65 min |
| Aug 8, 2:19 PM CDT | Mesoscale Discussion | SPC | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more | 86 min |
| Aug 8, 2:32 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Cottonwood, Faribault, Freeborn, Jackson, Martin and 6 more | 7 hr |
| Aug 8, 4:51 PM CDT | Mesoscale Discussion | SPC | Anoka, Brown, Carver, Chippewa, Hennepin, Isanti and 18 more | 54 min |
| Aug 8, 5:47 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Faribault, Freeborn, Jackson, Martin, Nobles and 3 more | 58 min |
| Aug 8, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 21 more | 8 hr |
| Aug 7, 7:00 PM CDT | Mesoscale Discussion | SPC | Brown, Forest, Langlade, Lincoln, Marathon, Marinette and 10 more | 90 min |
| Aug 8, 2:34 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Clark, Door, Fond du Lac and 25 more | 116 min |
Nearby
Tornado Watches in Minnesota, 2010Tornado Watches in Wisconsin, 2010Every tornado watch in 2010
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.