Alert archive / Nebraska / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 320
The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2020, 6:34 PM CDT for 48 counties in Nebraska; 22 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2020, 6:34 PM CDT (23:34 UTC)
- Expired
- Jul 1, 2020, 1:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 70 counties
Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 23:35 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 7:59 PM CDT | Severe Thunderstorm Warning | GID | Buffalo, Dawson | 31 min |
| Jun 30, 8:34 PM CDT | Severe Thunderstorm Warning | GID | Buffalo, Hall, Howard, Sherman | 41 min |
| Jun 30, 9:00 PM CDT | Severe Thunderstorm Warning | OAX | Antelope, Boone | 30 min |
| Jun 30, 9:11 PM CDT | Severe Thunderstorm Warning | GID | Hall, Hamilton, Howard, Merrick, Nance | 49 min |
| Jun 30, 9:19 PM CDT | Severe Thunderstorm Warning | OAX | Boone | 41 min |
| Jun 30, 9:48 PM CDT | Severe Thunderstorm Warning | GID | Hall, Hamilton, Howard, Merrick, Polk, York | 57 min |
| Jun 30, 9:56 PM CDT | Severe Thunderstorm Warning | GID | Adams, Clay, Hall, Hamilton | 64 min |
| Jun 30, 9:56 PM CDT | Severe Thunderstorm Warning | OAX | Boone, Platte | 34 min |
| Jun 30, 10:14 PM CDT | Severe Thunderstorm Warning | GID | Merrick, Nance | 46 min |
| Jun 30, 10:26 PM CDT | Severe Thunderstorm Warning | OAX | Boone, Platte | 49 min |
| Jun 30, 10:30 PM CDT | Severe Thunderstorm Warning | LBF | Holt | 30 min |
| Jun 30, 10:47 PM CDT | Severe Thunderstorm Warning | GID | Clay, Fillmore, Hamilton, York | 43 min |
| Jun 30, 10:47 PM CDT | Severe Thunderstorm Warning | OAX | Butler, Colfax, Platte | 43 min |
| Jun 30, 10:59 PM CDT | Severe Thunderstorm Warning | LBF | Boyd, Holt | 31 min |
| Jun 30, 11:10 PM CDT | Severe Thunderstorm Warning | OAX | Butler, Colfax, Dodge, Saunders | 35 min |
| Jul 1, 12:57 AM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Saline, Seward | 33 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
Aberdeen, SD (KABR), launched 12:00Z, 11.6 hours before the alert went out and 246 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
- 2645 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 4.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 5:48 PM CDT | Mesoscale Discussion | SPC | Antelope, Boyd, Buffalo, Custer, Dawson, Garfield and 13 more | 87 min |
| Jun 29, 7:43 PM CDT | Mesoscale Discussion | SPC | Butte, Harding, Lawrence, Meade, Perkins | 2 hr |
| Jun 29, 11:35 PM CDT | Mesoscale Discussion | SPC | Butte, Meade, Perkins | 115 min |
| Jun 30, 5:25 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brown, Clark, Codington, Day and 13 more | 2 hr |
| Jun 30, 6:04 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Clark, Codington, Day, Deuel, Edmunds and 8 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2020Severe Thunderstorm Watches in South Dakota, 2020Every severe thunderstorm watch in 2020
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.