Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1915

July 20, 20034 counties in Colorado; 8 counties in Kansas; 38 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2003, 3:32 PM MDT for 4 counties in Colorado; 8 counties in Kansas; 38 counties in Nebraska. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2003, 3:32 PM MDT (21:32 UTC)
Expired: Jul 20, 2003, 4:30 PM MDT
In force: 58 min
Issued by: the Storm Prediction Center

All 50 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Graham County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Sheridan County, KS, Thomas County, KS, Adams County, NE, Arthur County, NE, Boone County, NE, Buffalo County, NE, Chase County, NE, Cheyenne County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Perkins County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Goodland radar (KGLD), 153 km from the middle of the area, began a volume at 21:35 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 775Jul 20, 3:50 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.5 hours before the alert went out and 80 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: 3043 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 20, 12:25 PM MDT	Mesoscale Discussion	SPC	Sedgwick	95 min
Jul 20, 3:50 PM MDT	Severe Thunderstorm Watch	SPC	Decatur, Norton, Phillips, Rawlins, Sheridan, Thomas	4 hr
Jul 20, 1:09 PM MDT	Mesoscale Discussion	SPC	Antelope, Burt, Butler, Cedar, Colfax, Cuming and 14 more	66 min
Jul 20, 1:50 PM MDT	Tornado Watch	SPC	Burt, Cass, Cedar, Colfax, Cuming, Dakota and 13 more	6 hr
Jul 20, 4:29 PM MDT	Mesoscale Discussion	SPC	Burt, Cass, Colfax, Cuming, Dakota, Dodge and 11 more	91 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.