Alert archive / North Dakota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 675
The Storm Prediction Center issued this severe thunderstorm watch at Jul 22, 2011, 10:15 PM CDT for 12 counties in Minnesota; 18 counties in North Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2011, 10:15 PM CDT (03:15 UTC)
- Expired
- Jul 23, 2011, 5:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 30 counties
Becker County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wadena County, MN, Barnes County, ND, Benson County, ND, Bottineau County, ND, Cass County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, McHenry County, ND, Nelson County, ND, Pierce County, ND, Ramsey County, ND, Rolette County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND, Wells County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 68 km from the middle of the area, began a volume at 03:18 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 11:07 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Foster, Kidder, Morton, Sheridan, Stutsman and 1 more | 68 min |
| Jul 22, 11:08 PM CDT | Severe Thunderstorm Warning | BIS | McLean, Oliver, Sheridan, Wells | 67 min |
| Jul 23, 12:14 AM CDT | Flash Flood Warning | BIS | Foster, Kidder, Stutsman, Wells | 6 hr |
| Jul 23, 12:16 AM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 59 min |
| Jul 23, 1:09 AM CDT | Severe Thunderstorm Warning | BIS | Stutsman | 66 min |
| Jul 23, 1:20 AM CDT | Flash Flood Warning | FGF | Eddy, Nelson | 6 hr |
| Jul 23, 1:29 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Griggs | 61 min |
| Jul 23, 1:35 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Griggs | 55 min |
| Jul 23, 2:22 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Steele, Traill | 53 min |
| Jul 23, 3:01 AM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Steele, Traill | 59 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, 4:55 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Clearwater, Grant, Hubbard, Mahnomen, Otter Tail and 1 more | 50 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 3.3 hours before the alert went out and 217 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
- 1986 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.2
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 23, 1:25 AM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Clearwater, Douglas, Grant and 13 more | 35 min |
| Jul 23, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Chippewa, Douglas, Grant and 20 more | 5 hr |
| 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 North Dakota, 2011Severe 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.