Alert archive / North Dakota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 650
The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2011, 9:58 AM CDT for 14 counties in Minnesota; 20 counties in North Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2011, 9:58 AM CDT (14:58 UTC)
- Expired
- Jul 17, 2011, 5:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 70 kt
All 34 counties
Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Hubbard County, MN, Kittson County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Barnes County, ND, Benson County, ND, Cass County, ND, Cavalier County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, McHenry County, ND, Nelson County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Rolette County, ND, Sheridan County, ND, Steele County, ND, Towner County, ND, Traill County, ND, Walsh County, ND, Wells County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 104 km from the middle of the area, began a volume at 15:01 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
- 80%
- One or more gusts of 65 knots or more
- 60%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 10:13 AM CDT | Severe Thunderstorm Warning | BIS | McHenry, Ward | 47 min |
| Jul 17, 10:25 AM CDT | Tornado Warning | BIS | McHenry, McLean, Sheridan, Ward | 35 min |
| Jul 17, 10:57 AM CDT | Tornado Warning | BIS | McHenry, McLean, Pierce, Sheridan | 33 min |
| Jul 17, 11:26 AM CDT | Tornado Warning | BIS | McHenry, Pierce, Sheridan, Wells | 49 min |
| Jul 17, 11:45 AM CDT | Severe Thunderstorm Warning | FGF | Benson | 60 min |
| Jul 17, 12:13 PM CDT | Tornado Warning | BIS | Wells | 32 min |
| Jul 17, 12:33 PM CDT | Tornado Warning | FGF | Eddy | 42 min |
| Jul 17, 12:44 PM CDT | Severe Thunderstorm Warning | BIS | Wells | 16 min |
| Jul 17, 1:11 PM CDT | Tornado Warning | BIS | Foster | 64 min |
| Jul 17, 1:11 PM CDT | Tornado Warning | FGF | Eddy | 49 min |
| Jul 17, 2:11 PM CDT | Tornado Warning | BIS | Foster, Stutsman | 49 min |
| Jul 17, 2:24 PM CDT | Tornado Warning | FGF | Barnes, Griggs | 36 min |
| Jul 17, 2:33 PM CDT | Flash Flood Warning | BIS | Foster | 6 hr |
| Jul 17, 2:57 PM CDT | Tornado Warning | FGF | Barnes, Griggs | 48 min |
| Jul 17, 3:34 PM CDT | Tornado Warning | FGF | Barnes, Griggs, Steele | 41 min |
| Jul 17, 4:12 PM CDT | Tornado Warning | FGF | Barnes, Cass | 63 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 12:00Z, 3.0 hours before the alert went out and 233 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
- 4227 J/kg
- Mixed-layer CIN
- -184 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 37.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 9:25 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Kittson, Lake of the Woods and 7 more | 95 min |
| Jul 16, 11:37 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 9 more | 23 min |
| Jul 17, 9:15 AM CDT | Mesoscale Discussion | SPC | Becker, Clay, Clearwater, Kittson, Mahnomen, Marshall and 4 more | 2 hr |
| Jul 17, 10:24 AM CDT | Mesoscale Discussion | SPC | Becker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 5 more | 66 min |
| Jul 17, 12:49 PM CDT | Tornado Watch | SPC | Becker, Clay, Clearwater, Hubbard, Mahnomen, Norman and 3 more | 3 hr |
| Jul 17, 1:42 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Beltrami, Benton, Cass, Clay and 18 more | 93 min |
| Jul 17, 3:37 PM CDT | Tornado Watch | SPC | Becker, Clay, Grant, Otter Tail, Wadena, Wilkin | 6 hr |
| Jul 17, 4:34 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Benton, Carlton, Cass, Chippewa, Cook and 19 more | 7 hr |
| Jul 17, 6:34 PM CDT | Mesoscale Discussion | SPC | Big Stone, Traverse | 56 min |
| Jul 17, 11:01 AM CDT | Mesoscale Discussion | SPC | Benson, Eddy, Foster, Grand Forks, Nelson, Ramsey | 89 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.