Alert archive / Colorado / Mesoscale Discussions in 2018
Mesoscale Discussion 1146
The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2018, 1:00 PM MDT for 25 counties in Colorado. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2018, 1:00 PM MDT (19:00 UTC)
- Expired
- Jul 23, 2018, 2:30 PM MDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 25 counties
Adams County, CO, Alamosa County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Chaffee County, CO, Clear Creek County, CO, Crowley County, CO, Custer County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Gilpin County, CO, Grand County, CO, Huerfano County, CO, Jefferson County, CO, Lake County, CO, Larimer County, CO, Park County, CO, Pueblo County, CO, Summit County, CO, Teller County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 106 km from the middle of the area, began a volume at 19:00 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 (KDEN), launched 12:00Z, 7.0 hours before the alert went out and 203 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
- 267 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 981 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 1:27 PM MDT | Severe Thunderstorm Watch | SPC | Baca, Bent, Broomfield, Crowley, Custer, Douglas and 10 more | 8 hr |
| Jul 23, 4:31 PM MDT | Mesoscale Discussion | SPC | Custer, Douglas, El Paso, Fremont, Huerfano, Las Animas and 4 more | 89 min |
Nearby
Mesoscale Discussions in Colorado, 2018Every mesoscale discussion in 2018
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.