Alert archive / South Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1786

July 19, 20055 counties in Nebraska; 7 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2005, 6:39 PM MDT for 5 counties in Nebraska; 7 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2005, 6:39 PM MDT (00:39 UTC)
Expired: Jul 19, 2005, 8:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Cherry County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Hughes County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 103 km from the middle of the area, began a volume at 00:42 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

Aberdeen, SD (KABR), launched 00:00Z, 0.7 hours before the alert went out and 302 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: 1994 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 2043 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.0

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
Jul 20, 4:55 AM MDT	Mesoscale Discussion	SPC	Burt	95 min
Jul 20, 10:26 AM MDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Colfax, Cuming, Dakota and 9 more	94 min
Jul 20, 5:20 PM MDT	Severe Thunderstorm Watch	SPC	Cherry, Keya Paha	5 hr
Jul 19, 10:18 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brookings, Clark, Clay, Codington and 17 more	87 min
Jul 20, 12:25 AM MDT	Severe Thunderstorm Watch	SPC	Brookings, Codington, Deuel, Grant, Hamlin, Hanson and 8 more	6 hr
Jul 20, 4:12 PM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Haakon, Jackson, Meade, Oglala Lakota and 1 more	93 min

Nearby

Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in Nebraska, 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.