Alert archive / North Dakota / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 704
The Storm Prediction Center issued this severe thunderstorm watch at Aug 14, 2009, 5:40 PM CDT for Clay County, Norman County, Wilkin County, Minnesota; 12 counties in North Dakota; 7 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 14, 2009, 5:40 PM CDT (22:40 UTC)
- Expired
- Aug 14, 2009, 10:18 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 22 counties
Clay County, MN, Norman County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Foster County, ND, Griggs County, ND, LaMoure County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Brown County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Marshall County, SD, McPherson County, SD, Spink County, SD
The radar
The Fargo/Grand Forks radar (KMVX), 107 km from the middle of the area, began a volume at 22:43 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
- 30%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 5:43 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 62 min |
| Aug 14, 5:55 PM CDT | Severe Thunderstorm Warning | ABR | Brown, McPherson | 50 min |
| Aug 14, 6:17 PM CDT | Severe Thunderstorm Warning | BIS | Kidder, Stutsman | 58 min |
| Aug 14, 6:18 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 27 min |
| Aug 14, 6:28 PM CDT | Flash Flood Warning | BIS | Stutsman | 5 hr |
| Aug 14, 6:40 PM CDT | Flash Flood Warning | ABR | Brown, McPherson | 58 min |
| Aug 14, 7:11 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 36 min |
| Aug 14, 8:43 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 32 min |
| Aug 14, 9:16 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 12 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, 10.7 hours before the alert went out and 205 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
- 2309 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -135 m²/s²
- 0-3 km storm-relative helicity
- -172 m²/s²
- Significant tornado parameter
- -0.2
- Supercell composite
- -2.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 10:25 AM CDT | Mesoscale Discussion | SPC | Kittson, Lake of the Woods, Marshall, Pennington, Polk, Red Lake and 1 more | 95 min |
| Aug 14, 3:42 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Mahnomen, Norman, Otter Tail, Traverse and 1 more | 93 min |
| Aug 14, 12:33 AM CDT | Mesoscale Discussion | SPC | Benson, Billings, Bottineau, Dunn, Golden Valley, McHenry and 12 more | 87 min |
| Aug 14, 2:32 PM CDT | Mesoscale Discussion | SPC | Mellette, Todd, Tripp | 58 min |
| Aug 14, 4:28 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Buffalo, Hand, Hughes, Hyde, Jackson and 7 more | 6 hr |
Nearby
Severe Thunderstorm Watches in North Dakota, 2009Severe Thunderstorm Watches in South Dakota, 2009Severe Thunderstorm Watches in Minnesota, 2009Every severe thunderstorm watch in 2009
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.