Alert archive / Nebraska / Tornado Watches in 2009
Tornado Watch 504
The Storm Prediction Center issued this tornado watch at Jun 23, 2009, 5:37 PM MDT for 17 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2009, 5:37 PM MDT (23:37 UTC)
- Expired
- Jun 24, 2009, 12:00 AM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE
The radar
The North Platte radar (KLNX), 67 km from the middle of the area, began a volume at 23:39 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 6:05 PM MDT | Tornado Warning | LBF | Logan | 40 min |
| Jun 23, 6:43 PM MDT | Tornado Warning | LBF | Custer, Lincoln, Logan | 47 min |
| Jun 23, 7:25 PM MDT | Tornado Warning | LBF | Custer, Lincoln, Logan | 50 min |
| Jun 23, 8:14 PM MDT | Tornado Warning | LBF | Custer | 31 min |
| Jun 23, 8:38 PM MDT | Severe Thunderstorm Warning | LBF | Deuel | 37 min |
| Jun 23, 8:44 PM MDT | Flash Flood Warning | LBF | Custer, Lincoln, Logan | 3 hr |
| Jun 23, 8:46 PM MDT | Severe Thunderstorm Warning | LBF | Custer | 29 min |
| Jun 23, 8:58 PM MDT | Severe Thunderstorm Warning | LBF | Garden | 62 min |
| Jun 23, 9:16 PM MDT | Severe Thunderstorm Warning | LBF | Deuel | 29 min |
| Jun 23, 9:16 PM MDT | Severe Thunderstorm Warning | LBF | Grant | 28 min |
| Jun 23, 9:51 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Garden | 24 min |
| Jun 23, 9:59 PM MDT | Severe Thunderstorm Warning | LBF | Custer | 46 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, 11.6 hours before the alert went out and 94 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
- 2250 J/kg
- Mixed-layer CIN
- -153 J/kg
- Mixed-layer LCL
- 768 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- -26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 1:39 PM MDT | Mesoscale Discussion | SPC | Phillips, Sedgwick, Yuma | 111 min |
| Jun 23, 2:18 PM MDT | Mesoscale Discussion | SPC | Logan, Weld | 87 min |
| Jun 23, 2:51 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more | 6 hr |
| Jun 23, 12:07 AM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Blaine, Box Butte, Brown, Cherry and 17 more | 53 min |
| Jun 23, 12:38 AM MDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Deuel and 13 more | 6 hr |
| Jun 23, 2:17 AM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Cherry, Dawes, Deuel and 8 more | 88 min |
| Jun 23, 3:43 AM MDT | Mesoscale Discussion | SPC | Cherry, Hooker, Keya Paha, McPherson, Thomas | 92 min |
| Jun 23, 6:24 AM MDT | Mesoscale Discussion | SPC | Antelope, Boyd, Brown, Cedar, Cherry, Dakota and 10 more | 96 min |
| Jun 23, 7:01 AM MDT | Severe Thunderstorm Watch | SPC | Antelope, Burt, Cedar, Cuming, Dakota, Dixon and 6 more | 6 hr |
| Jun 23, 10:31 AM MDT | Mesoscale Discussion | SPC | Dakota, Thurston | 89 min |
| Jun 23, 2:21 PM MDT | Mesoscale Discussion | SPC | Butler, Cass, Clay, Dodge, Douglas, Fillmore and 12 more | 54 min |
| Jun 23, 2:28 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Butler, Cass, Clay, Colfax and 25 more | 7 hr |
| Jun 23, 5:12 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Custer, Keith, Lincoln, Logan and 3 more | 93 min |
Nearby
Tornado Watches in Nebraska, 2009Every tornado watch in 2009
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.