Alert archive / Wyoming / Tornado Warnings in 2018
Tornado Warning 21, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jul 28, 2018, 3:12 PM MDT for Converse County, Wyoming. It was in force for 48 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 28, 2018, 3:12 PM MDT (21:12 UTC)
- Expired
- Jul 28, 2018, 4:00 PM MDT
- In force
- 48 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.75 in
County Converse County, WY
The radar
The Cheyenne radar (KCYS), 212 km from the middle of the area, began a volume at 21:15 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 28, 3:56 PM MDT | TORNADO | 8 Wnw Douglas, WY | MOVING TO THE SOUTHEAST |
| Jul 28, 3:59 PM MDT | TORNADO | 12 W Douglas, WY | AYERS NATURAL BRIDGE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 28, 2:34 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.2 hours before the alert went out and 222 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
- 33 J/kg
- Mixed-layer CIN
- -324 J/kg
- Mixed-layer LCL
- 1147 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 407 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
442
WFUS55 KCYS 282112
TORCYS
WYC009-282200-
/O.NEW.KCYS.TO.W.0021.180728T2112Z-180728T2200Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
312 PM MDT SAT JUL 28 2018
The National Weather Service in Cheyenne has issued a
* Tornado Warning for...
Southern Converse County in east central Wyoming...
* Until 400 PM MDT.
* At 312 PM MDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of Rolling Hills, or 26 miles northeast
of Casper, moving southeast at 35 mph.
HAZARD...Tornado and golf ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Rolling Hills and Rolling Hills Estates around 320 PM MDT.
Glenrock around 325 PM MDT.
Deer Creek around 330 PM MDT.
Laprele Reservoir around 350 PM MDT.
Douglas around 400 PM MDT.
This includes Interstate 25 in Wyoming between mile markers 139 and
172.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4299 10502 4244 10586 4297 10608 4306 10607
4321 10597
TIME...MOT...LOC 2112Z 315DEG 32KT 4301 10586
TORNADO...RADAR INDICATED
HAIL...1.75IN
$$
Hammer2 follow-up statements
833
WWUS55 KCYS 282134
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
334 PM MDT SAT JUL 28 2018
WYC009-282200-
/O.CON.KCYS.TO.W.0021.000000T0000Z-180728T2200Z/
Converse WY-
334 PM MDT SAT JUL 28 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR
SOUTHWESTERN CONVERSE COUNTY...
At 333 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Deer Creek, or 16 miles northwest of Douglas, moving
southeast at 35 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Laprele Reservoir around 350 PM MDT.
Douglas around 400 PM MDT.
This includes Interstate 25 in Wyoming between mile markers 139 and
166.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4288 10519 4248 10580 4293 10593 4305 10574
TIME...MOT...LOC 2133Z 315DEG 32KT 4287 10567
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
Hammer182
WWUS55 KCYS 282145
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
345 PM MDT SAT JUL 28 2018
WYC009-282200-
/O.CON.KCYS.TO.W.0021.000000T0000Z-180728T2200Z/
Converse WY-
345 PM MDT SAT JUL 28 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR CENTRAL
CONVERSE COUNTY...
At 344 PM MDT, a severe thunderstorm with a history of producing
tornadoes was located near Laprele Reservoir, or 9 miles west of
Douglas, moving southeast at 35 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation. This storm has a history of
producing tornadoes!
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Douglas around 400 PM MDT.
If in the Douglas area, seek shelter immediately!
This includes Interstate 25 in Wyoming between mile markers 139 and
159.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4283 10527 4255 10570 4287 10578 4295 10555
TIME...MOT...LOC 2144Z 315DEG 32KT 4280 10558
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
HammerThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:08 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Converse, Platte | 52 min |
| Jul 27, 7:04 PM MDT | Special Weather Statement | CYS | Platte | 41 min |
| Jul 27, 7:09 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 29 min |
| Jul 27, 8:01 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 29 min |
| Jul 27, 8:25 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 50 min |
| Jul 27, 9:03 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 42 min |
| Jul 27, 9:25 PM MDT | Special Weather Statement | CYS | Converse | 50 min |
| Jul 27, 9:31 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 29 min |
| Jul 27, 9:36 PM MDT | Special Weather Statement | CYS | Niobrara | 39 min |
| Jul 28, 3:02 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 43 min |
| Jul 28, 3:27 PM MDT | Tornado Warning | CYS | Goshen, Platte | 33 min |
| Jul 28, 3:32 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Niobrara, Platte | 43 min |
| Jul 28, 3:49 PM MDT | Tornado Warning | CYS | Albany, Converse, Platte | 41 min |
| Jul 28, 3:55 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 35 min |
| Jul 28, 4:26 PM MDT | Tornado Warning | CYS | Albany, Converse, Platte | 34 min |
| Jul 28, 4:29 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 46 min |
| Jul 28, 4:53 PM MDT | Tornado Warning | CYS | Goshen, Platte | 52 min |
| Jul 28, 5:30 PM MDT | Special Weather Statement | CYS | Converse | 45 min |
| Jul 28, 5:43 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 47 min |
| Jul 28, 5:56 PM MDT | Severe Thunderstorm Warning | CYS | Converse | 64 min |
Nearby
Tornado Warnings in Wyoming, 2018Every tornado warning in 2018Tornadoes in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.