Alert archive / Wyoming / Tornado Watches in 2019
Tornado Watch 484
The Storm Prediction Center issued this tornado watch at Jul 4, 2019, 2:37 PM MDT for 5 counties in Nebraska; 6 counties in Wyoming. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2019, 2:37 PM MDT (20:37 UTC)
- Expired
- Jul 4, 2019, 11:53 PM MDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 65 kt
Counties Banner County, NE, Box Butte County, NE, Dawes County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 148 km from the middle of the area, began a volume at 20:39 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
- 10%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 3:21 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 24 min |
| Jul 4, 3:37 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 23 min |
| Jul 4, 3:54 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 66 min |
| Jul 4, 4:32 PM MDT | Tornado Warning | CYS | Laramie, Platte | 28 min |
| Jul 4, 4:57 PM MDT | Tornado Warning | CYS | Platte | 48 min |
| Jul 4, 5:45 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 45 min |
| Jul 4, 5:53 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 28 min |
| Jul 4, 6:18 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 24 min |
| Jul 4, 6:41 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Platte | 34 min |
| Jul 4, 7:28 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Platte | 32 min |
| Jul 4, 7:31 PM MDT | Flash Flood Warning | CYS | Albany, Converse, Platte | 3 hr |
| Jul 4, 7:56 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Platte | 49 min |
| Jul 4, 7:59 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 46 min |
| Jul 4, 8:17 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse | 43 min |
| Jul 4, 8:33 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 42 min |
| Jul 4, 8:44 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 31 min |
| Jul 4, 8:54 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 36 min |
| Jul 4, 8:56 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Platte | 34 min |
| Jul 4, 9:09 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse | 36 min |
| Jul 4, 9:26 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 49 min |
| Jul 4, 9:39 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Platte | 51 min |
| Jul 4, 10:11 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 64 min |
| Jul 4, 10:30 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 60 min |
| Jul 4, 10:59 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 61 min |
| Jul 4, 11:38 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 52 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, 8.6 hours before the alert went out and 225 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
- 111 J/kg
- Mixed-layer CIN
- -196 J/kg
- Mixed-layer LCL
- 760 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
926
WWUS20 KWNS 042033
SEL4
SPC WW 042033
NEZ000-WYZ000-050400-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 484
NWS Storm Prediction Center Norman OK
235 PM MDT Thu Jul 4 2019
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northwest Nebraska Panhandle
Southeast Wyoming
* Effective this Thursday afternoon and evening from 235 PM until
1000 PM MDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail and isolated very large hail events to 2.5
inches in diameter likely
Scattered damaging winds and isolated significant gusts to 75
mph possible
SUMMARY...Multiple supercells should develop across southeast
Wyoming this evening and may eventually evolve into a cluster across
parts of the Nebraska Panhandle.
The tornado watch area is approximately along and 75 statute miles
north and south of a line from 45 miles south southwest of Douglas
WY to 30 miles south southeast of Chadron NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU4).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 483...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24030.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 6:06 PM MDT | Mesoscale Discussion | SPC | Blaine, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more | 114 min |
| Jul 3, 7:03 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more | 3 hr |
| Jul 3, 9:13 PM MDT | Mesoscale Discussion | SPC | Blaine, Brown, Hooker, Keya Paha, Loup, Rock and 1 more | 92 min |
| Jul 4, 1:56 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sioux | 2 hr |
| Jul 4, 2:36 PM MDT | Mesoscale Discussion | SPC | Blaine, Brown, Cherry, Dawes, Grant, Hooker and 6 more | 114 min |
| Jul 4, 3:32 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Brown, Cherry, Sheridan, Thomas | 5 hr |
| Jul 4, 4:53 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sioux | 2 hr |
| Jul 4, 5:30 PM MDT | Mesoscale Discussion | SPC | Cherry, Hooker | 2 hr |
| Jul 3, 6:09 PM MDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Brown, Brule, Buffalo, Campbell and 21 more | 7 hr |
| Jul 3, 9:26 PM MDT | Mesoscale Discussion | SPC | Butte, Custer, Fall River, Lawrence, Meade, Pennington | 64 min |
| Jul 4, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Fall River, Haakon, Jackson and 4 more | 8 hr |
| Jul 4, 3:58 PM MDT | Mesoscale Discussion | SPC | Campbell, Crook, Hot Springs, Johnson, Washakie, Weston | 62 min |
Nearby
Tornado Watches in Wyoming, 2019Tornado Watches in Nebraska, 2019Every tornado watch in 2019
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.