Alert archive / North Dakota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 707
The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2011, 10:26 PM CDT for 14 counties in Minnesota; 31 counties in North Dakota. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2011, 10:26 PM CDT (03:26 UTC)
- Expired
- Aug 1, 2011, 6:17 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 45 counties
Becker County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Kittson County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wilkin County, MN, Barnes County, ND, Benson County, ND, Burleigh County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Nelson County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Sheridan County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND, Ward County, ND, Wells County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 64 km from the middle of the area, began a volume at 03:30 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
- 30%
- 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
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 10:35 PM CDT | Flash Flood Warning | BIS | Burleigh, Grant, Morton, Sioux | 5 hr |
| Jul 31, 11:00 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Morton, Oliver, Sheridan | 60 min |
| Jul 31, 11:26 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McHenry, McLean, Mercer, Oliver, Sheridan and 1 more | 64 min |
| Jul 31, 11:36 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons, Kidder, Logan, McLean, Sheridan and 1 more | 54 min |
| Aug 1, 12:11 AM CDT | Severe Thunderstorm Warning | BIS | Foster, Kidder, Stutsman, Wells | 64 min |
| Aug 1, 12:41 AM CDT | Severe Thunderstorm Warning | FGF | Griggs, Steele, Traill | 64 min |
| Aug 1, 12:53 AM CDT | Severe Thunderstorm Warning | BIS | Foster, Wells | 52 min |
| Aug 1, 1:02 AM CDT | Severe Thunderstorm Warning | BIS | Pierce | 28 min |
| Aug 1, 1:03 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Eddy, Nelson, Ramsey | 57 min |
| Aug 1, 1:07 AM CDT | Severe Thunderstorm Warning | BIS | Foster, Stutsman, Wells | 53 min |
| Aug 1, 1:28 AM CDT | Severe Thunderstorm Warning | BIS | Emmons, Logan, McIntosh | 47 min |
| Aug 1, 1:29 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Eddy, Griggs, Nelson | 46 min |
| Aug 1, 2:05 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Grand Forks, Griggs, Nelson, Ramsey, Steele and 2 more | 40 min |
| Aug 1, 2:11 AM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure, Logan, McIntosh | 64 min |
| Aug 1, 2:37 AM CDT | Severe Thunderstorm Warning | FGF | Marshall, Norman, Pennington, Polk, Red Lake | 53 min |
| Aug 1, 3:16 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Wilkin | 59 min |
| Aug 1, 4:15 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Otter Tail, Wilkin | 60 min |
| Aug 1, 5:13 AM CDT | Severe Thunderstorm Warning | FGF | Grant, Otter Tail, Wilkin | 62 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, 3.4 hours before the alert went out and 211 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
- 5391 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1026 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 5.9
- Supercell composite
- 30.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 12:35 AM CDT | Mesoscale Discussion | SPC | Clay, Norman, Polk | 85 min |
| Aug 1, 2:31 AM CDT | Mesoscale Discussion | SPC | Becker, Cass, Clay, Clearwater, Crow Wing, Douglas and 11 more | 89 min |
| Aug 1, 4:57 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Brown, Cass, Chippewa and 28 more | 7 hr |
| Aug 1, 7:31 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 33 more | 89 min |
| Aug 1, 10:42 AM CDT | Mesoscale Discussion | SPC | Benton, Kandiyohi, Meeker, Mille Lacs, Morrison, Pope and 5 more | 63 min |
| Aug 1, 11:29 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chisago, Dakota, Hennepin and 8 more | 31 min |
| Aug 1, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Becker, Benton, Big Stone, Blue Earth, Brown and 43 more | 7 hr |
| Aug 1, 1:50 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dakota, Dodge, Fillmore, Freeborn, Goodhue and 12 more | 25 min |
| Aug 1, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 5 hr |
| Aug 1, 3:53 PM CDT | Mesoscale Discussion | SPC | Anoka, Becker, Benton, Blue Earth, Carver, Chippewa and 47 more | 67 min |
| Jul 31, 8:16 PM CDT | Mesoscale Discussion | SPC | Adams, Grant, Morton, Sioux | 89 min |
| Aug 1, 1:33 PM CDT | Mesoscale Discussion | SPC | Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 10 more | 57 min |
| Aug 1, 2:19 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bowman, Burleigh, Emmons, Grant, Hettinger and 10 more | 6 hr |
| Aug 1, 5:57 PM CDT | Mesoscale Discussion | SPC | Adams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more | 2 hr |
| Aug 1, 6:10 PM CDT | Mesoscale Discussion | SPC | Adams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more | 2 hr |
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.