Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 22, NWS Cheyenne, WY

July 28, 2018Goshen County, Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 28, 2018, 3:27 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2018, 3:27 PM MDT (21:27 UTC)
Expired: Jul 28, 2018, 4:00 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 72 km from the middle of the area, began a volume at 21:28 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.

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

Denver, CO (KDEN), launched 12:00Z, 9.5 hours before the alert went out and 240 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 281 J/kg
Mixed-layer CIN: -374 J/kg
Mixed-layer LCL: 928 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

516 
WFUS55 KCYS 282127
TORCYS
WYC015-031-282200-
/O.NEW.KCYS.TO.W.0022.180728T2127Z-180728T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
327 PM MDT SAT JUL 28 2018

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Southwestern Goshen County in southeastern Wyoming...
  Southeastern Platte County in southeastern Wyoming...

* Until 400 PM MDT.
    
* At 326 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles east of Slater, or 23 miles southeast of
  Wheatland, moving southeast at 20 mph.

  HAZARD...Tornado and half dollar 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 tornadic thunderstorm will remain over mainly rural areas of
  southwestern Goshen and southeastern Platte Counties.

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 4180 10477 4193 10459 4178 10422 4157 10447
TIME...MOT...LOC 2126Z 307DEG 17KT 4183 10461 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Trudel

2 follow-up statements

386 
WWUS55 KCYS 282136
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
336 PM MDT SAT JUL 28 2018

WYC031-282146-
/O.CAN.KCYS.TO.W.0022.000000T0000Z-180728T2200Z/
Platte WY-
336 PM MDT SAT JUL 28 2018

...THE TORNADO WARNING FOR SOUTHEASTERN PLATTE COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM MDT for southeastern
Wyoming.

LAT...LON 4176 10465 4189 10465 4193 10459 4178 10422
      4157 10447
TIME...MOT...LOC 2136Z 307DEG 17KT 4180 10456 

$$

WYC015-282200-
/O.CON.KCYS.TO.W.0022.000000T0000Z-180728T2200Z/
Goshen WY-
336 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR
SOUTHWESTERN GOSHEN COUNTY...
    
At 336 PM MDT, a severe thunderstorm capable of producing a tornado
was located 13 miles east of Slater, or 26 miles southwest of
Torrington, moving southeast at 20 mph.

HAZARD...Tornado and half dollar 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.

Locations impacted include...
Hawk Springs.

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 4176 10465 4189 10465 4193 10459 4178 10422
      4157 10447
TIME...MOT...LOC 2136Z 307DEG 17KT 4180 10456 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Trudel

426 
WWUS55 KCYS 282157
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
357 PM MDT SAT JUL 28 2018

WYC015-282207-
/O.EXP.KCYS.TO.W.0022.000000T0000Z-180728T2200Z/
Goshen WY-
357 PM MDT SAT JUL 28 2018

...THE TORNADO WARNING FOR SOUTHWESTERN GOSHEN COUNTY WILL EXPIRE AT
400 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Tornado Watch remains in effect until 1000 PM MDT for southeastern
Wyoming.

LAT...LON 4176 10465 4189 10465 4193 10459 4178 10422
      4157 10447
TIME...MOT...LOC 2157Z 307DEG 17KT 4175 10447 

$$

Trudel

The 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, 3:12 PM MDT	Tornado Warning	CYS	Converse	48 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 Tornado observedConsiderable damage threat	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, 2018 Every tornado warning in 2018 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.