Alert archive / Nebraska / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 433
The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2015, 8:55 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2015, 8:55 PM CDT (01:55 UTC)
- Expired
- Jul 18, 2015, 1:26 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 39 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boone County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 50 km from the middle of the area, began a volume at 01:58 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 9:19 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 41 min |
| Jul 17, 9:25 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 35 min |
| Jul 17, 9:27 PM CDT | Severe Thunderstorm Warning | OAX | Boone | 33 min |
| Jul 17, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Yankton | 47 min |
| Jul 17, 10:10 PM CDT | Severe Thunderstorm Warning | OAX | Cedar, Pierce, Wayne | 50 min |
| Jul 17, 10:22 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Hutchinson, Lincoln, Turner, Yankton | 23 min |
| Jul 17, 10:23 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 52 min |
| Jul 17, 10:53 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 52 min |
| Jul 17, 11:23 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, O'Brien, Plymouth, Sioux, Woodbury | 52 min |
| Jul 18, 12:29 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 31 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
Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 206 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
- 3350 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1845 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 9.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:57 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 15 more | 3 hr |
| Jul 17, 11:26 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 12 more | 2 hr |
| Jul 18, 2:05 AM CDT | Mesoscale Discussion | SPC | Howard, Mitchell, Winneshiek, Worth | 85 min |
| Jul 18, 3:06 AM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 84 min |
| Jul 18, 12:31 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Buchanan, Cedar, Clayton and 21 more | 119 min |
| Jul 18, 1:31 PM CDT | Tornado Watch | SPC | Clinton, Dubuque, Jackson, Scott | 5 hr |
| Jul 17, 7:18 PM CDT | Mesoscale Discussion | SPC | Benton, Brown, Carver, Chippewa, Cottonwood, Douglas and 29 more | 117 min |
| Jul 17, 8:39 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Blue Earth, Brown, Carver, Chippewa, Dakota and 27 more | 5 hr |
| Jul 17, 9:55 PM CDT | Mesoscale Discussion | SPC | Big Stone, Grant, Traverse | 65 min |
| Jul 18, 12:23 AM CDT | Mesoscale Discussion | SPC | Anoka, Dakota, Dodge, Goodhue, Hennepin, Houston and 7 more | 67 min |
| Jul 18, 12:41 AM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 5 hr |
| Jul 18, 4:29 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Chase, Cheyenne, Deuel, Garden and 5 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2015Severe Thunderstorm Watches in Iowa, 2015Severe Thunderstorm Watches in South Dakota, 2015Every severe thunderstorm watch in 2015
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.