Alert archive / Nebraska / Mesoscale Discussions in 2009
Mesoscale Discussion 1807
The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2009, 7:34 PM MDT for 10 counties in Nebraska; 6 counties in South Dakota. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2009, 7:34 PM MDT (01:34 UTC)
- Expired
- Aug 6, 2009, 9:00 PM MDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
Counties Arthur County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Morrill County, NE, Sheridan County, NE, Bennett County, SD, Custer County, SD, Jackson County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD
The radar
The Rapid City radar (KUDX), 152 km from the middle of the area, began a volume at 01:35 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
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.6 hours before the alert went out and 239 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
- 1404 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 1264 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 8.1
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 |
|---|---|---|---|---|
| Aug 6, 8:15 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Brown, Buffalo, Chase, Cherry and 20 more | 6 hr |
| Aug 7, 12:23 AM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Butler, Clay and 31 more | 2 hr |
| Aug 7, 2:55 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 35 more | 95 min |
| Aug 7, 5:37 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more | 113 min |
| Aug 7, 11:50 AM MDT | Mesoscale Discussion | SPC | Butte, Harding | 115 min |
| Aug 7, 4:06 PM MDT | Mesoscale Discussion | SPC | Butte, Custer, Harding, Lawrence, Meade, Oglala Lakota and 1 more | 84 min |
| Aug 7, 4:56 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Fall River, Haakon, Harding and 6 more | 6 hr |
Nearby
Mesoscale Discussions in Nebraska, 2009Mesoscale Discussions in South Dakota, 2009Every mesoscale discussion in 2009
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.