Alert archive / North Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1807
The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2011, 7:16 PM MDT for 4 counties in North Dakota. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2011, 7:16 PM MDT (01:16 UTC)
- Expired
- Jul 31, 2011, 8:45 PM MDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
Counties Adams County, ND, Grant County, ND, Morton County, ND, Sioux County, ND
The radar
The Bismarck radar (KBIS), 115 km from the middle of the area, began a volume at 01:20 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.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 1.3 hours before the alert went out and 118 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 9:26 PM MDT | Severe Thunderstorm Watch | SPC | Barnes, Benson, Burleigh, Cass, Cavalier, Dickey and 25 more | 8 hr |
| Jul 31, 11:35 PM MDT | Mesoscale Discussion | SPC | Barnes, Burleigh, Cass, Eddy, Emmons, Foster and 12 more | 85 min |
| Aug 1, 1:31 AM MDT | Mesoscale Discussion | SPC | Cass, Grand Forks, Griggs, Nelson, Steele, Traill and 1 more | 89 min |
| Aug 1, 3:57 AM MDT | Severe Thunderstorm Watch | SPC | Barnes, Cass, Dickey, Eddy, Foster, Griggs and 11 more | 7 hr |
| Aug 1, 10:52 AM MDT | Severe Thunderstorm Watch | SPC | Barnes, Cass, Grand Forks, Griggs, Nelson, Ransom and 4 more | 7 hr |
| Aug 1, 12:33 PM MDT | Mesoscale Discussion | SPC | Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 10 more | 57 min |
| Aug 1, 1:19 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Bowman, Burleigh, Emmons, Grant, Hettinger and 10 more | 6 hr |
| Aug 1, 2:53 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Grand Forks, Griggs, Nelson, Ransom and 3 more | 67 min |
| Aug 1, 4:57 PM MDT | Mesoscale Discussion | SPC | Adams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more | 2 hr |
| Aug 1, 5:10 PM MDT | Mesoscale Discussion | SPC | Adams, Barnes, Benson, Burleigh, Cavalier, Dickey and 23 more | 2 hr |
Nearby
Mesoscale Discussions in North Dakota, 2011Every mesoscale discussion 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.