Alert archive / Colorado / Mesoscale Discussions in 2011
Mesoscale Discussion 1275
The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2011, 11:45 AM MDT for 13 counties in Colorado; Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2011, 11:45 AM MDT (17:45 UTC)
- Expired
- Jun 18, 2011, 1:45 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Adams County, CO, Arapahoe County, CO, Cheyenne County, CO, Elbert County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Cheyenne County, NE, Kimball County, NE
The radar
The Denver radar (KFTG), 96 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
Denver, CO (KDNR), launched 12:00Z, 5.8 hours before the alert went out and 16 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
- 110 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1171 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 52 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 |
|---|---|---|---|---|
| Jun 17, 7:27 PM MDT | Mesoscale Discussion | SPC | Bent, Cheyenne, Crowley, Kiowa, Lincoln, Prowers | 93 min |
| Jun 18, 12:31 PM MDT | Severe Thunderstorm Watch | SPC | Bent, Cheyenne, Crowley, Elbert, El Paso, Kiowa and 11 more | 7 hr |
| Jun 18, 4:15 PM MDT | Mesoscale Discussion | SPC | Cheyenne, Kiowa, Kit Carson, Phillips, Prowers, Sedgwick and 1 more | 90 min |
| Jun 17, 6:09 PM MDT | Severe Thunderstorm Watch | SPC | Burt, Cass, Cuming, Dakota, Dodge, Douglas and 6 more | 3 hr |
| Jun 18, 1:07 AM MDT | Mesoscale Discussion | SPC | Pawnee | 53 min |
| Jun 18, 4:36 PM MDT | Severe Thunderstorm Watch | SPC | Buffalo, Custer, Dawson, Franklin, Frontier, Furnas and 14 more | 7 hr |
Nearby
Mesoscale Discussions in Colorado, 2011Mesoscale Discussions in Nebraska, 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.