Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 599

April 19, 200513 counties in Colorado; 22 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2005, 6:21 PM MDT for 13 counties in Colorado; 22 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2005, 6:21 PM MDT (00:21 UTC)
Expired: Apr 19, 2005, 8:15 PM MDT
In force: 114 min
Issued by: the Storm Prediction Center

All 38 counties

Adams County, CO, Arapahoe County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 73 km from the middle of the area, began a volume at 00:23 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 166Apr 19, 8:30 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 205 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: 1105 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1405 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 7.0

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 20, 5:23 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Elbert, Logan, Morgan, Phillips and 3 more	97 min
Apr 19, 6:38 PM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Colfax, Cuming and 22 more	2 hr
Apr 19, 8:30 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Brown, Buffalo, Custer, Dawson, Garfield and 14 more	8 hr
Apr 19, 9:56 PM MDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Buffalo, Cedar and 23 more	94 min
Apr 20, 12:14 AM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 15 more	2 hr
Apr 20, 12:18 AM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Burt, Butler, Cedar, Colfax and 15 more	117 min

Nearby

Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Colorado, 2005 Mesoscale Discussions in Wyoming, 2005 Every mesoscale discussion in 2005

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.