Alert archive / Colorado / Tornado Watches in 2010
Tornado Watch 358
The Storm Prediction Center issued this tornado watch at Jun 20, 2010, 1:30 PM MDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2010, 1:30 PM MDT (19:30 UTC)
- Expired
- Jun 20, 2010, 8:45 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3.5 in
- Strongest gust expected
- 70 kt
All 43 counties
Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Carter County, MT, Fallon County, MT, 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, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 205 km from the middle of the area, began a volume at 19:30 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
- 60%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 70%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 1:59 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 35 min |
| Jun 20, 2:49 PM MDT | Severe Thunderstorm Warning | UNR | Meade | 26 min |
| Jun 20, 3:24 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 51 min |
| Jun 20, 3:36 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 54 min |
| Jun 20, 3:42 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 39 min |
| Jun 20, 3:48 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 27 min |
| Jun 20, 3:56 PM MDT | Flash Flood Warning | CYS | Scotts Bluff, Sioux | 5 hr |
| Jun 20, 4:02 PM MDT | Severe Thunderstorm Warning | CYS | Scotts Bluff, Sioux | 58 min |
| Jun 20, 4:02 PM MDT | Tornado Warning | CYS | Goshen, Platte | 28 min |
| Jun 20, 4:06 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 54 min |
| Jun 20, 4:10 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 27 min |
| Jun 20, 4:28 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 77 min |
| Jun 20, 4:30 PM MDT | Tornado Warning | CYS | Goshen, Laramie, Platte | 30 min |
| Jun 20, 4:44 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Meade, Pennington | 61 min |
| Jun 20, 4:53 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 46 min |
| Jun 20, 4:58 PM MDT | Tornado Warning | CYS | Goshen, Platte | 32 min |
| Jun 20, 4:58 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 62 min |
| Jun 20, 5:26 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 64 min |
| Jun 20, 5:36 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 54 min |
| Jun 20, 5:39 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Scotts Bluff | 51 min |
| Jun 20, 5:46 PM MDT | Severe Thunderstorm Warning | UNR | Weston | 59 min |
| Jun 20, 5:49 PM MDT | Tornado Warning | CYS | Converse | 41 min |
| Jun 20, 5:52 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 68 min |
| Jun 20, 6:06 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Meade, Pennington | 54 min |
| Jun 20, 6:08 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 67 min |
| Jun 20, 6:27 PM MDT | Severe Thunderstorm Warning | UNR | Crook | 63 min |
| Jun 20, 6:33 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Scotts Bluff | 57 min |
| Jun 20, 6:55 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 65 min |
| Jun 20, 6:56 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Mellette | 79 min |
| Jun 20, 7:01 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson | 35 min |
| Jun 20, 7:09 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Fallon | 51 min |
| Jun 20, 7:55 PM MDT | Flash Flood Warning | BYZ | Carter | 3 hr |
| Jun 20, 8:15 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Mellette | 60 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
Rapid City, SD (KUNR), launched 12:00Z, 7.5 hours before the alert went out and 199 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
- 20 J/kg
- Mixed-layer CIN
- -352 J/kg
- Mixed-layer LCL
- 1707 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -77 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 12:59 PM MDT | Mesoscale Discussion | SPC | Adams, Broomfield, Morgan, Weld | 2 hr |
| Jun 20, 2:07 PM MDT | Tornado Watch | SPC | Cheyenne, Kit Carson, Yuma | 8 hr |
| Jun 20, 4:23 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 9 more | 67 min |
| Jun 20, 12:14 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon | 91 min |
| Jun 20, 12:55 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carbon, Custer, Musselshell, Powder River, Rosebud and 2 more | 8 hr |
| Jun 20, 3:55 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Stillwater, Wheatland and 1 more | 65 min |
| Jun 19, 8:22 PM MDT | Severe Thunderstorm Watch | SPC | Franklin, Furnas, Gage, Harlan, Jefferson, Nuckolls and 4 more | 6 hr |
| Jun 19, 9:08 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Boyd, Brown, Cherry and 22 more | 67 min |
| Jun 19, 9:39 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Boyd, Brown, Cherry, Garfield, Grant and 8 more | 6 hr |
| Jun 19, 10:13 PM MDT | Mesoscale Discussion | SPC | Gage, Jefferson, Johnson, Nemaha, Otoe, Pawnee and 1 more | 92 min |
| Jun 20, 3:26 AM MDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Brown, Butler, Cedar and 25 more | 94 min |
| Jun 20, 3:46 AM MDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Brown, Butler, Cedar and 25 more | 89 min |
| Jun 20, 11:04 AM MDT | Mesoscale Discussion | SPC | Nemaha, Pawnee, Richardson | 116 min |
| Jun 20, 1:49 PM MDT | Mesoscale Discussion | SPC | Franklin, Harlan, Nuckolls, Thayer, Webster | 56 min |
| Jun 20, 4:31 PM MDT | Mesoscale Discussion | SPC | Franklin, Webster | 89 min |
| Jun 20, 5:55 PM MDT | Mesoscale Discussion | SPC | Gage, Jefferson, Nuckolls, Pawnee, Thayer | 95 min |
Nearby
Tornado Watches in Colorado, 2010Tornado Watches in South Dakota, 2010Tornado Watches in Nebraska, 2010Every tornado watch in 2010
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.