Alert archive / North Dakota / Tornado Watches in 2010
Tornado Watch 651
The Storm Prediction Center issued this tornado watch at Sep 9, 2010, 3:57 PM MDT for 14 counties in North Dakota; Corson County, Perkins County, South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 9, 2010, 3:57 PM MDT (21:57 UTC)
- Expired
- Sep 9, 2010, 9:55 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McKenzie County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Corson County, SD, Perkins County, SD
The radar
The Bismarck radar (KBIS), 153 km from the middle of the area, began a volume at 21:57 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
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 |
|---|---|---|---|---|
| Sep 9, 4:00 PM MDT | Tornado Warning | BIS | Billings, Golden Valley, Slope | 30 min |
| Sep 9, 4:21 PM MDT | Tornado Warning | BIS | Billings, Golden Valley, Slope | 24 min |
| Sep 9, 4:44 PM MDT | Tornado Warning | BIS | Billings, Stark | 31 min |
| Sep 9, 4:52 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, Stark | 53 min |
| Sep 9, 5:07 PM MDT | Tornado Warning | BIS | Billings, Dunn, Stark | 23 min |
| Sep 9, 5:29 PM MDT | Tornado Warning | BIS | Billings, Dunn, Stark | 31 min |
| Sep 9, 5:33 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer, Stark | 57 min |
| Sep 9, 6:01 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 42 min |
| Sep 9, 6:33 PM MDT | Severe Thunderstorm Warning | BIS | McLean, Mercer, Oliver | 57 min |
| Sep 9, 6:34 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins, Ziebach | 36 min |
| Sep 9, 6:40 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, Mercer | 50 min |
| Sep 9, 7:14 PM MDT | Flash Flood Warning | BIS | Dunn, Mercer, Oliver | 4 hr |
| Sep 9, 7:31 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, McLean, Mercer | 59 min |
| Sep 9, 7:34 PM MDT | Severe Thunderstorm Warning | BIS | Billings, Golden Valley, McKenzie | 56 min |
| Sep 9, 8:01 PM MDT | Severe Thunderstorm Warning | BIS | McKenzie, Williams | 43 min |
| Sep 9, 8:29 PM MDT | Severe Thunderstorm Warning | BIS | Billings, Dunn, McKenzie | 46 min |
| Sep 9, 9:13 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, Mountrail | 47 min |
| Sep 9, 9:45 PM MDT | Severe Thunderstorm Warning | BIS | Dunn, McKenzie, McLean, Mountrail | 45 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, 10.0 hours before the alert went out and 157 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
- 5 J/kg
- Mixed-layer CIN
- -491 J/kg
- Mixed-layer LCL
- 659 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 264 m²/s²
- 0-3 km storm-relative helicity
- 371 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 1:47 PM MDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Golden Valley, Hettinger, Slope and 1 more | 28 min |
| Sep 9, 2:35 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bowman, Burke, Divide, Dunn and 14 more | 8 hr |
Nearby
Tornado Watches in North Dakota, 2010Tornado Watches in South Dakota, 2010Every tornado watch in 2010
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.