Alert archive / Colorado / Mesoscale Discussions in 2017

Mesoscale Discussion 844

May 26, 201710 counties in Colorado

The Storm Prediction Center issued this mesoscale discussion at May 26, 2017, 11:43 AM MDT for 10 counties in Colorado. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 26, 2017, 11:43 AM MDT (17:43 UTC)
Expired: May 26, 2017, 1:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, El Paso County, CO, Elbert County, CO, Lincoln County, CO, Morgan County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 37 km from the middle of the area, began a volume at 17:49 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 268May 26, 1:00 PM MDT

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 5.7 hours before the alert went out and 108 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: 1013 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 189 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 26, 1:00 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Baca, Bent, Boulder, Broomfield and 22 more	9 hr
May 26, 2:38 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 15 more	97 min
May 26, 5:14 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Baca, Bent, Cheyenne, Crowley and 15 more	2 hr

Nearby

Mesoscale Discussions in Colorado, 2017 Every mesoscale discussion in 2017

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.