Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1901

July 19, 2003Sedgwick County, Colorado; 19 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2003, 4:16 PM MDT for Sedgwick County, Colorado; 19 counties in Nebraska. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2003, 4:16 PM MDT (22:16 UTC)
Expired: Jul 19, 2003, 6:15 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Sedgwick County, CO, Arthur County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Cherry County, NE, Cheyenne County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 35 km from the middle of the area, began a volume at 22:16 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.3 hours before the alert went out and 99 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: 1943 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 19, 4:55 PM MDT	Mesoscale Discussion	SPC	Adams, Bent, Cheyenne, Crowley, Elbert, Kiowa and 4 more	3 hr
Jul 18, 7:59 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more	61 min

Nearby

Mesoscale Discussions in Nebraska, 2003 Mesoscale Discussions in Colorado, 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.