Alert archive / Montana / Mesoscale Discussions in 2013
Mesoscale Discussion 795
The Storm Prediction Center issued this mesoscale discussion at May 25, 2013, 11:43 AM MDT for 4 states. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- May 25, 2013, 11:43 AM MDT (17:43 UTC)
- Expired
- May 25, 2013, 1:15 PM MDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 29 counties
Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Hettinger County, ND, McKenzie County, ND, Slope County, ND, Stark County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 195 km from the middle of the area, began a volume at 17:45 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
Rapid City, SD (KUNR), launched 12:00Z, 5.7 hours before the alert went out and 199 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
- 1101 J/kg
- Mixed-layer CIN
- -140 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 14 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 25, 1:52 PM MDT | Tornado Watch | SPC | Carter, Custer, Dawson, Fallon, Powder River, Prairie and 2 more | 8 hr |
| May 25, 2:27 PM MDT | Mesoscale Discussion | SPC | Goshen, Laramie, Platte | 93 min |
Nearby
Mesoscale Discussions in Montana, 2013Mesoscale Discussions in South Dakota, 2013Mesoscale Discussions in North 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.