Alert archive / Colorado / Mesoscale Discussions in 2018

Mesoscale Discussion 1243

August 6, 201813 counties in Colorado

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2018, 12:21 PM MDT for 13 counties in Colorado. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Aug 6, 2018, 12:21 PM MDT (18:21 UTC)
Expired: Aug 6, 2018, 2:15 PM MDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Baca County, CO, Bent County, CO, Costilla County, CO, Crowley County, CO, Custer County, CO, El Paso County, CO, Fremont County, CO, Huerfano County, CO, Las Animas County, CO, Otero County, CO, Prowers County, CO, Pueblo County, CO, Teller County, CO

The radar

The Pueblo radar (KPUX), 45 km from the middle of the area, began a volume at 18:23 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.

Severe Thunderstorm Watch 333Aug 6, 1:00 PM MDT

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 6.4 hours before the alert went out and 212 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 573 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 855 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 6:05 PM MDT	Mesoscale Discussion	SPC	Larimer	115 min
Aug 6, 12:59 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Crowley, Custer, Douglas, Elbert and 10 more	9 hr
Aug 6, 2:02 PM MDT	Mesoscale Discussion	SPC	Boulder, Larimer, Morgan, Weld	88 min
Aug 6, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Jefferson and 5 more	7 hr
Aug 6, 5:24 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 24 more	66 min

Nearby

Mesoscale Discussions in Colorado, 2018 Every 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.