Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1687

July 7, 20038 counties in Colorado; 9 counties in Kansas; 20 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 6:48 PM MDT for 8 counties in Colorado; 9 counties in Kansas; 20 counties in Nebraska. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2003, 6:48 PM MDT (00:48 UTC)
Expired: Jul 7, 2003, 8:45 PM MDT
In force: 117 min
Issued by: the Storm Prediction Center

All 37 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Logan County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Thomas County, NE

The radar

The Goodland radar (KGLD), 99 km from the middle of the area, began a volume at 00:49 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 675Jul 7, 9:20 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.8 hours before the alert went out and 78 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: 797 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 2692 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 7, 9:15 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 51 more	3 hr
Jul 7, 9:20 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 65 more	7 hr
Jul 8, 12:34 AM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Burt, Butler, Cass and 48 more	116 min
Jul 8, 1:52 AM MDT	Mesoscale Discussion	SPC	Boyd, Cedar, Dakota, Dixon	113 min
Jul 8, 1:36 PM MDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Sioux	84 min
Jul 8, 4:13 PM MDT	Mesoscale Discussion	SPC	Cass, Dodge, Douglas, Johnson, Nemaha, Otoe and 5 more	92 min

Nearby

Mesoscale Discussions in Nebraska, 2003 Mesoscale Discussions in Kansas, 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.