Alert archive / Colorado / Mesoscale Discussions in 2020
Mesoscale Discussion 1397
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2020, 12:52 PM MDT for 7 states. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2020, 12:52 PM MDT (18:52 UTC)
- Expired
- Aug 4, 2020, 2:45 PM MDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 60%
All 54 counties
Adams County, CO, Arapahoe County, CO, Baca County, CO, Bent County, CO, Boulder County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Gilpin County, CO, Jefferson County, CO, Kiowa County, CO, Kit Carson County, CO, Larimer County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Greeley County, KS, Hamilton County, KS, Morton County, KS, Stanton County, KS, Stevens County, KS, Wallace County, KS, Banner County, NE, Cheyenne County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Union County, NM, Cimarron County, OK, Texas County, OK, Dallam County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Moore County, TX, Sherman County, TX, Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY
The radar
The Denver radar (KFTG), 45 km from the middle of the area, began a volume at 18:51 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, 6.9 hours before the alert went out and 78 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
- 115 J/kg
- Mixed-layer CIN
- -462 J/kg
- Mixed-layer LCL
- 2368 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Aug 4, 1:46 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Arapahoe, Baca, Bent, Boulder, Broomfield and 22 more | 7 hr |
| Aug 4, 4:16 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 18 more | 119 min |
| Aug 4, 5:05 PM MDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Cherry, Garden, Grant, Hooker and 5 more | 115 min |
Nearby
Mesoscale Discussions in Colorado, 2020Mesoscale Discussions in Kansas, 2020Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020
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.