Alert archive / Minnesota / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 477
The Storm Prediction Center issued this severe thunderstorm watch at Aug 6, 2013, 7:31 PM CDT for 25 counties in Minnesota; 22 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2013, 7:31 PM CDT (00:31 UTC)
- Expired
- Aug 7, 2013, 1:17 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 47 counties
Anoka County, MN, Benton County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Pine County, MN, Ramsey County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Wright County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Washburn County, WI
The radar
The Minneapolis radar (KMPX), 82 km from the middle of the area, began a volume at 00:31 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 7:33 PM CDT | Severe Thunderstorm Warning | MPX | Stearns, Wright | 42 min |
| Aug 6, 7:40 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Hennepin, Ramsey, Washington | 65 min |
| Aug 6, 7:41 PM CDT | Severe Thunderstorm Warning | MPX | Barron | 34 min |
| Aug 6, 7:42 PM CDT | Severe Thunderstorm Warning | DLH | Pine | 33 min |
| Aug 6, 8:08 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin, Scott | 37 min |
| Aug 6, 8:15 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Rusk | 45 min |
| Aug 6, 8:18 PM CDT | Severe Thunderstorm Warning | MPX | Goodhue | 57 min |
| Aug 6, 8:54 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Hennepin, Scott, Washington | 66 min |
| Aug 6, 9:32 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Chippewa, Dunn, Rusk | 43 min |
| Aug 6, 9:36 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire, Pepin | 39 min |
| Aug 6, 9:39 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 51 min |
| Aug 6, 9:43 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Jackson, Trempealeau | 62 min |
| Aug 6, 10:53 PM CDT | Severe Thunderstorm Warning | ARX | Clark, Jackson, Monroe | 52 min |
| Aug 6, 11:03 PM CDT | Severe Thunderstorm Warning | ARX | Winona | 42 min |
| Aug 6, 11:19 PM CDT | Severe Thunderstorm Warning | ARX | Adams, Juneau | 41 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, 0.5 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
- 576 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1678 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 10:11 PM CDT | Mesoscale Discussion | SPC | Dodge, Fillmore, Houston, Olmsted, Steele, Wabasha and 1 more | 2 hr |
| Aug 6, 10:45 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dodge, Fond du Lac, Green Lake and 15 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 2013Severe Thunderstorm Watches in Wisconsin, 2013Every severe thunderstorm watch in 2013
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.