Alert archive / Colorado / Mesoscale Discussions in 2018

Mesoscale Discussion 552

May 28, 2018Jackson County, Routt County, Colorado; Albany County, Carbon County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 28, 2018, 12:19 PM MDT for Jackson County, Routt County, Colorado; Albany County, Carbon County, Wyoming. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 28, 2018, 12:19 PM MDT (18:19 UTC)
Expired: May 28, 2018, 1:45 PM MDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Jackson County, CO, Routt County, CO, Albany County, WY, Carbon County, WY

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 18:27 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 128May 28, 2:00 PM MDT

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 6.3 hours before the alert went out and 245 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1303 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 23 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
May 28, 12:46 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson	59 min
May 28, 1:12 PM MDT	Tornado Watch	SPC	Cheyenne, Kit Carson, Lincoln, Washington, Yuma	8 hr
May 28, 1:39 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 7 more	96 min
May 28, 2:01 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Crowley and 13 more	7 hr
May 28, 4:54 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Washington, Yuma	96 min
May 27, 7:31 PM MDT	Mesoscale Discussion	SPC	Crook, Niobrara, Weston	119 min

Nearby

Mesoscale Discussions in Colorado, 2018 Mesoscale Discussions in Wyoming, 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.