Alert archive / Colorado / Mesoscale Discussions in 2008

Mesoscale Discussion 701

April 23, 200816 counties in Colorado; 11 counties in Nebraska; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 12:16 PM MDT for 16 counties in Colorado; 11 counties in Nebraska; 4 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 23, 2008, 12:16 PM MDT (18:16 UTC)
Expired: Apr 23, 2008, 2:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Baca County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Pennington County, SD

The radar

The Denver radar (KFTG), 119 km from the middle of the area, began a volume at 18:21 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.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 6.3 hours before the alert went out and 56 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: 2130 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 23, 1:25 PM MDT	Tornado Watch	SPC	Baca, Bent, Cheyenne, Kiowa, Kit Carson, Logan and 5 more	8 hr
Apr 23, 3:04 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Burt and 51 more	2 hr
Apr 23, 3:34 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Burt and 51 more	116 min
Apr 23, 4:58 PM MDT	Tornado Watch	SPC	Blaine, Brown, Custer, Garfield, Holt, Keya Paha and 2 more	4 hr
Apr 23, 4:38 PM MDT	Mesoscale Discussion	SPC	Bennett, Haakon, Hughes, Hyde, Jackson, Jones and 8 more	3 hr
Apr 23, 5:48 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Custer, Fall River, Haakon, Jackson, Jones and 5 more	6 hr

Nearby

Mesoscale Discussions in Colorado, 2008 Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in South Dakota, 2008 Every mesoscale discussion in 2008

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.