Alert archive / North Dakota / Mesoscale Discussions in 2013
Mesoscale Discussion 679
The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 4:24 PM MDT for 24 counties in North Dakota; 16 counties in South Dakota. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 18, 2013, 4:24 PM MDT (22:24 UTC)
- Expired
- May 18, 2013, 5:30 PM MDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 40 counties
Adams County, ND, Billings County, ND, Bowman County, ND, Burleigh County, ND, Dickey County, ND, Dunn County, ND, Emmons County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Stutsman County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD
The radar
The Bismarck radar (KBIS), 82 km from the middle of the area, began a volume at 22:23 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 10.4 hours before the alert went out and 237 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
- 120 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 921 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| May 18, 4:46 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Burleigh, Dickey, Emmons, Foster, Grant and 11 more | 7 hr |
| May 17, 6:28 PM MDT | Mesoscale Discussion | SPC | Bennett, Brule, Butte, Custer, Fall River, Gregory and 15 more | 92 min |
| May 17, 6:59 PM MDT | Severe Thunderstorm Watch | SPC | Aurora, Brule, Buffalo, Charles Mix, Douglas, Faulk and 10 more | 3 hr |
| May 17, 9:26 PM MDT | Mesoscale Discussion | SPC | Aurora, Bennett, Brule, Buffalo, Butte, Charles Mix and 23 more | 64 min |
| May 18, 2:31 PM MDT | Mesoscale Discussion | SPC | Bennett, Brule, Buffalo, Butte, Custer, Dewey and 21 more | 59 min |
| May 18, 2:55 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Fall River, Haakon, Harding and 9 more | 8 hr |
| May 18, 5:11 PM MDT | Mesoscale Discussion | SPC | Brookings, Codington, Deuel, Grant, Hamlin, Kingsbury | 94 min |
Nearby
Mesoscale Discussions in North Dakota, 2013Mesoscale Discussions in South Dakota, 2013Every mesoscale discussion in 2013
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.