Alert archive / Colorado / Mesoscale Discussions in 2014

Mesoscale Discussion 640

May 21, 2014Broomfield County, Denver County, Jefferson County, Colorado

The Storm Prediction Center issued this mesoscale discussion at May 21, 2014, 1:58 PM MDT for Broomfield County, Denver County, Jefferson County, Colorado. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: May 21, 2014, 1:58 PM MDT (19:58 UTC)
Expired: May 21, 2014, 3:00 PM MDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Broomfield County, CO, Denver County, CO, Jefferson County, CO

The radar

The Denver radar (KFTG), 28 km from the middle of the area, began a volume at 20:00 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 nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 8.0 hours before the alert went out and 139 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: 268 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 786 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 6:02 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Phillips, Sedgwick, Yuma	88 min
May 20, 6:27 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Phillips, Sedgwick, Yuma	4 hr
May 20, 8:06 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Lincoln, Logan, Phillips, Sedgwick and 2 more	84 min
May 21, 12:09 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Denver, Elbert, Morgan and 1 more	96 min
May 21, 12:34 PM MDT	Tornado Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 5 more	8 hr
May 21, 1:42 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Crowley, El Paso, Kiowa, Las Animas and 4 more	63 min
May 21, 2:18 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Crowley, El Paso, Huerfano, Kiowa and 4 more	4 hr
May 21, 4:17 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Elbert, Kit Carson, Lincoln, Washington, Yuma	58 min
May 21, 4:48 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Lincoln, Washington, Yuma	6 hr

Nearby

Mesoscale Discussions in Colorado, 2014 Every mesoscale discussion in 2014

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.