Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1440

June 20, 2003Cheyenne County, Rawlins County, Kansas; 24 counties in Nebraska; Bennett County, Todd County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2003, 8:59 PM CDT for Cheyenne County, Rawlins County, Kansas; 24 counties in Nebraska; Bennett County, Todd County, South Dakota. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2003, 8:59 PM CDT (01:59 UTC)
Expired: Jun 20, 2003, 10:00 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

All 28 counties

Cheyenne County, KS, Rawlins County, KS, Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Thomas County, NE, Bennett County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 46 km from the middle of the area, began a volume at 02:03 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

Rapid City, SD (KUNR), launched 00:00Z, 2.0 hours before the alert went out and 280 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: 812 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1538 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 155 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
Jun 20, 7:19 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Finney, Gove, Gray, Greeley and 11 more	86 min
Jun 21, 5:16 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Cloud, Comanche, Edwards and 25 more	119 min
Jun 21, 2:10 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Arthur, Banner, Blaine, Boone, Box Butte and 32 more	7 hr
Jun 21, 4:52 PM CDT	Mesoscale Discussion	SPC	Antelope, Arthur, Blaine, Boone, Box Butte, Boyd and 30 more	83 min
Jun 21, 1:14 PM CDT	Mesoscale Discussion	SPC	Butte, Campbell, Corson, Custer, Dewey, Fall River and 14 more	3 hr
Jun 21, 2:45 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Corson, Day, Dewey, Edmunds and 7 more	6 hr
Jun 21, 3:03 PM CDT	Mesoscale Discussion	SPC	Brookings, Lincoln, Minnehaha, Moody	117 min
Jun 21, 6:50 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Day, Edmunds, Grant, McPherson, Marshall and 1 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2003 Mesoscale Discussions in Kansas, 2003 Mesoscale Discussions in South Dakota, 2003 Every mesoscale discussion in 2003

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.