Alert archive / Wyoming / Mesoscale Discussions in 2007
Mesoscale Discussion 1673
The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2007, 1:24 PM MDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2007, 1:24 PM MDT (19:24 UTC)
- Expired
- Aug 7, 2007, 3:30 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 23 counties
Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Dawes County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Oglala Lakota County, SD, Pennington County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Johnson County, WY, Niobrara County, WY, Sheridan County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 199 km from the middle of the area, began a volume at 19:27 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, 7.4 hours before the alert went out and 196 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
- 280 J/kg
- Mixed-layer CIN
- -203 J/kg
- Mixed-layer LCL
- 1568 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Aug 7, 1:59 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Fallon, Powder River | 7 hr |
| Aug 7, 2:51 PM MDT | Severe Thunderstorm Watch | SPC | Dawson, McCone, Prairie, Richland, Wibaux | 6 hr |
| Aug 7, 5:30 PM MDT | Mesoscale Discussion | SPC | Carter, Custer, Dawson, Fallon, McCone, Powder River and 3 more | 90 min |
| Aug 6, 6:24 PM MDT | Mesoscale Discussion | SPC | Antelope, Boone, Boyd, Burt, Butler, Cass and 25 more | 96 min |
| Aug 6, 9:28 PM MDT | Mesoscale Discussion | SPC | Burt, Butler, Cass, Clay, Colfax, Cuming and 19 more | 3 hr |
| Aug 7, 12:46 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Clay, Franklin, Hall, Harlan and 3 more | 89 min |
| Aug 7, 12:58 PM MDT | Mesoscale Discussion | SPC | Johnson, Nemaha, Otoe, Pawnee, Richardson | 2 hr |
Nearby
Mesoscale Discussions in Wyoming, 2007Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Montana, 2007Every mesoscale discussion in 2007
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.