Alert archive / Colorado / Mesoscale Discussions in 2013

Mesoscale Discussion 405

April 8, 20136 counties in Colorado; Cheyenne County, Kansas; Chase County, Dundy County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2013, 7:43 PM MDT for 6 counties in Colorado; Cheyenne County, Kansas; Chase County, Dundy County, Nebraska. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2013, 7:43 PM MDT (01:43 UTC)
Expired: Apr 8, 2013, 8:45 PM MDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Chase County, NE, Dundy County, NE

The radar

The Denver radar (KFTG), 133 km from the middle of the area, began a volume at 01:44 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 (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 29 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: 105 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 2884 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Apr 8, 10:15 PM MDT	Mesoscale Discussion	SPC	Phillips, Sedgwick, Washington, Yuma	90 min
Apr 9, 5:46 PM MDT	Mesoscale Discussion	SPC	Sedgwick	5 hr
Apr 9, 11:30 AM MDT	Mesoscale Discussion	SPC	Decatur, Graham, Norton, Phillips, Rawlins, Sheridan and 1 more	4 hr
Apr 9, 2:00 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Barber, Barton, Bourbon and 66 more	2 hr
Apr 9, 4:33 PM MDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Butler, Chase, Comanche, Cowley and 18 more	7 hr
Apr 9, 4:45 PM MDT	Severe Thunderstorm Watch	SPC	Brown, Clay, Cloud, Dickinson, Geary, Jackson and 11 more	7 hr
Apr 9, 4:12 AM MDT	Mesoscale Discussion	SPC	Burt, Dodge, Douglas, Saunders, Thurston, Washington	93 min

Nearby

Mesoscale Discussions in Colorado, 2013 Mesoscale Discussions in Nebraska, 2013 Mesoscale Discussions in Kansas, 2013 Every mesoscale discussion in 2013

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.