Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 637

April 30, 20034 counties in Kansas; 36 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2003, 1:49 AM CDT for 4 counties in Kansas; 36 counties in Nebraska. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2003, 1:49 AM CDT (06:49 UTC)
Expired: Apr 30, 2003, 3:45 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 40 counties

Decatur County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 19 km from the middle of the area, began a volume at 06:51 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 00:00Z, 6.8 hours before the alert went out and 193 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: 92 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Apr 29, 7:56 PM CDT	Mesoscale Discussion	SPC	Clay, Cloud, Decatur, Graham, Jewell, Mitchell and 10 more	2 hr
Apr 29, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 29 more	5 hr
Apr 29, 10:29 PM CDT	Mesoscale Discussion	SPC	Brown, Cheyenne, Clay, Cloud, Decatur, Dickinson and 28 more	2 hr
Apr 30, 1:22 AM CDT	Mesoscale Discussion	SPC	Decatur, Norton, Phillips, Rawlins	113 min
Apr 30, 2:49 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Dickinson, Doniphan, Geary and 13 more	116 min
Apr 30, 3:28 PM CDT	Mesoscale Discussion	SPC	Greeley, Wallace, Wichita	92 min
Apr 30, 5:15 PM CDT	Tornado Watch	SPC	Doniphan, Johnson, Leavenworth, Wyandotte	6 hr
Apr 30, 6:29 PM CDT	Mesoscale Discussion	SPC	Butler, Chase, Coffey, Cowley, Elk, Franklin and 11 more	91 min
Apr 29, 7:00 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Buffalo, Burt, Butler, Cass and 31 more	3 hr
Apr 29, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 46 more	7 hr
Apr 29, 10:40 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 45 more	2 hr

Nearby

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