Alert archive / Nebraska / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 775
The Storm Prediction Center issued this severe thunderstorm watch at Jul 20, 2003, 4:50 PM CDT for 6 counties in Kansas; 41 counties in Nebraska. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 4:50 PM CDT (21:50 UTC)
- Expired
- Jul 20, 2003, 9:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 47 counties
Decatur County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Sheridan County, KS, Thomas County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson 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, Lancaster County, NE, Lincoln County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Perkins County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE
The radar
The Grand Island radar (KUEX), 129 km from the middle of the area, began a volume at 21:54 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.
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:54 PM CDT | Severe Thunderstorm Warning | GID | Furnas | 66 min |
| Jul 20, 5:36 PM CDT | Severe Thunderstorm Warning | GLD | Rawlins | 54 min |
| Jul 20, 5:36 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Platte | 39 min |
| Jul 20, 6:00 PM CDT | Severe Thunderstorm Warning | GLD | Decatur, Norton | 45 min |
| Jul 20, 6:10 PM CDT | Tornado Warning | OAX | Platte | 35 min |
| Jul 20, 6:15 PM CDT | Severe Thunderstorm Warning | GLD | Thomas | 45 min |
| Jul 20, 6:34 PM CDT | Tornado Warning | GID | Merrick, Nance, Polk | 56 min |
| Jul 20, 6:42 PM CDT | Tornado Warning | OAX | Platte | 48 min |
| Jul 20, 6:50 PM CDT | Severe Thunderstorm Warning | GID | Nance | 25 min |
| Jul 20, 7:08 PM CDT | Tornado Warning | GID | Howard | 37 min |
| Jul 20, 7:11 PM CDT | Tornado Warning | GID | Hamilton, York | 64 min |
| Jul 20, 7:32 PM CDT | Tornado Warning | GID | Merrick, Polk | 28 min |
| Jul 20, 7:39 PM CDT | Severe Thunderstorm Warning | GID | Hall | 51 min |
| Jul 20, 8:01 PM CDT | Severe Thunderstorm Warning | GID | Merrick | 29 min |
| Jul 20, 8:14 PM CDT | Severe Thunderstorm Warning | GID | Hamilton, York | 61 min |
| Jul 20, 8:26 PM CDT | Severe Thunderstorm Warning | GID | Adams, Hall | 64 min |
| Jul 20, 8:32 PM CDT | Severe Thunderstorm Warning | GID | Clay, Fillmore | 73 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.8 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.
- 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
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:32 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 2 more | 58 min |
| Jul 20, 1:25 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Chase, Cheyenne, Custer and 13 more | 95 min |
| Jul 20, 2:09 PM CDT | Mesoscale Discussion | SPC | Antelope, Burt, Butler, Cedar, Colfax, Cuming and 14 more | 66 min |
| Jul 20, 2:50 PM CDT | Tornado Watch | SPC | Burt, Cass, Cedar, Colfax, Cuming, Dakota and 13 more | 6 hr |
| Jul 20, 5:29 PM CDT | Mesoscale Discussion | SPC | Burt, Cass, Colfax, Cuming, Dakota, Dodge and 11 more | 91 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2003Severe Thunderstorm Watches in Kansas, 2003Every severe thunderstorm watch 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.