Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 676
The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2011, 1:41 AM CDT for 26 counties in Minnesota; Ransom County, Richland County, Sargent County, North Dakota; 10 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2011, 1:41 AM CDT (06:41 UTC)
- Expired
- Jul 23, 2011, 7:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 39 counties
Becker County, MN, Benton County, MN, Big Stone County, MN, Chippewa County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pope County, MN, Renville County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN, Wright County, MN, Yellow Medicine County, MN, Ransom County, ND, Richland County, ND, Sargent County, ND, Brown County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, Roberts County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 104 km from the middle of the area, began a volume at 06:41 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
- 70%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 1:51 AM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 54 min |
| Jul 23, 2:00 AM CDT | Severe Thunderstorm Warning | ABR | Brown, Day, Marshall | 45 min |
| Jul 23, 2:39 AM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 51 min |
| Jul 23, 2:42 AM CDT | Severe Thunderstorm Warning | ABR | Big Stone, Traverse | 48 min |
| Jul 23, 3:12 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman, Polk, Wilkin | 63 min |
| Jul 23, 3:23 AM CDT | Severe Thunderstorm Warning | FGF | Grant, Otter Tail, Wilkin | 52 min |
| Jul 23, 3:58 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Clay, Clearwater, Grant, Mahnomen, Norman and 3 more | 62 min |
| Jul 23, 4:48 AM CDT | Severe Thunderstorm Warning | MPX | Douglas | 42 min |
| Jul 23, 4:55 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Clearwater, Grant, Hubbard, Mahnomen, Otter Tail and 1 more | 50 min |
| Jul 23, 5:21 AM CDT | Severe Thunderstorm Warning | MPX | Douglas, Morrison, Pope, Stearns, Todd | 54 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
Aberdeen, SD (KABR), launched 00:00Z, 6.7 hours before the alert went out and 142 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
- 3084 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1182 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 377 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 27.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 10:11 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Grant, Norman, Otter Tail, Wilkin | 64 min |
| Jul 22, 10:15 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 6 more | 7 hr |
| Jul 23, 1:25 AM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Clearwater, Douglas, Grant and 13 more | 35 min |
| Jul 23, 4:38 AM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Becker, Benton, Big Stone, Carver and 36 more | 67 min |
| Jul 23, 9:37 AM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Olmsted, Wabasha, Winona | 53 min |
| Jul 23, 10:14 AM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 4 hr |
| Jul 23, 1:10 PM CDT | Mesoscale Discussion | SPC | Houston | 65 min |
| Jul 23, 1:52 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 40 more | 83 min |
| Jul 22, 8:56 PM CDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Burke, Burleigh, Divide and 21 more | 94 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.