Alert archive / Colorado / Mesoscale Discussions in 2018

Mesoscale Discussion 788

June 18, 2018Logan County, Morgan County, Weld County, Colorado

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2018, 10:11 PM MDT for Logan County, Morgan County, Weld County, Colorado. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 18, 2018, 10:11 PM MDT (04:11 UTC)
Expired: Jun 19, 2018, 12:15 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Logan County, CO, Morgan County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 95 km from the middle of the area, began a volume at 04:14 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 nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 4.2 hours before the alert went out and 64 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: 1265 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1913 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 293 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 10.4

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
Jun 18, 6:37 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Denver, Logan, Morgan, Washington and 1 more	6 hr
Jun 18, 8:31 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Denver, Logan, Morgan and 2 more	119 min
Jun 18, 10:42 PM MDT	Severe Thunderstorm Watch	SPC	Yuma	3 hr
Jun 19, 11:48 AM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 19 more	117 min
Jun 19, 12:25 PM MDT	Tornado Watch	SPC	Adams, Arapahoe, Baca, Bent, Boulder, Broomfield and 24 more	7 hr
Jun 19, 1:54 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Baca, Bent, Boulder, Broomfield and 24 more	2 hr
Jun 19, 4:28 PM MDT	Mesoscale Discussion	SPC	Sedgwick	2 hr

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.