Alert archive / Nebraska / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 253
The Storm Prediction Center issued this severe thunderstorm watch at Jun 3, 2015, 8:59 PM MDT for 6 counties in Colorado; 8 counties in Nebraska; 5 counties in Wyoming. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 3, 2015, 8:59 PM MDT (02:59 UTC)
- Expired
- Jun 4, 2015, 2:00 AM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Adams County, CO, Arapahoe County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 56 km from the middle of the area, began a volume at 02:58 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- 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
- 50%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 9:15 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 34 min |
| Jun 3, 9:34 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 41 min |
| Jun 3, 10:15 PM MDT | Flash Flood Warning | CYS | Converse, Goshen, Niobrara, Platte | 4 hr |
| Jun 3, 10:16 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Niobrara, Platte | 44 min |
| Jun 3, 10:59 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 46 min |
| Jun 3, 11:46 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 44 min |
| Jun 3, 11:48 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 27 min |
| Jun 4, 12:01 AM MDT | Severe Thunderstorm Warning | BOU | Weld | 44 min |
| Jun 4, 12:05 AM MDT | Flash Flood Warning | CYS | Niobrara | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 3.0 hours before the alert went out and 205 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
- 840 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1384 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 7:14 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 6 more | 61 min |
| Jun 3, 10:28 PM MDT | Mesoscale Discussion | SPC | Cheyenne, Crowley, Kiowa, Kit Carson, Lincoln | 62 min |
| Jun 3, 10:59 PM MDT | Severe Thunderstorm Watch | SPC | Cheyenne, Crowley, Kiowa, Kit Carson, Lincoln, Yuma | 6 hr |
| Jun 4, 1:53 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Elbert, Kit Carson, Lincoln, Logan and 3 more | 97 min |
| Jun 4, 2:20 PM MDT | Tornado Watch | SPC | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 6 more | 8 hr |
| Jun 4, 4:25 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Crowley, El Paso, Las Animas, Otero and 2 more | 3 hr |
| Jun 4, 5:22 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 2 more | 113 min |
| Jun 3, 7:20 PM MDT | Mesoscale Discussion | SPC | Fillmore, Franklin, Gage, Jefferson, Lancaster, Nuckolls and 3 more | 115 min |
| Jun 3, 11:01 PM MDT | Mesoscale Discussion | SPC | Adams, Clay, Fillmore, Franklin, Furnas, Gage and 10 more | 89 min |
| Jun 4, 12:56 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Butler, Cass, Clay, Fillmore and 26 more | 94 min |
| Jun 4, 3:46 AM MDT | Mesoscale Discussion | SPC | Adams, Clay, Fillmore, Franklin, Gage, Harlan and 7 more | 89 min |
| Jun 4, 11:26 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Clay, Custer, Dawson, Fillmore and 17 more | 94 min |
| Jun 4, 2:28 PM MDT | Mesoscale Discussion | SPC | Hitchcock, Red Willow | 92 min |
| Jun 3, 7:49 PM MDT | Mesoscale Discussion | SPC | Campbell, Converse, Fremont, Hot Springs, Johnson, Natrona and 3 more | 56 min |
| Jun 4, 1:29 AM MDT | Mesoscale Discussion | SPC | Niobrara, Weston | 91 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2015Severe Thunderstorm Watches in Colorado, 2015Severe Thunderstorm Watches in Wyoming, 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.