Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 25, NWS Cheyenne, WY

July 28, 2018Goshen County, Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 28, 2018, 4:53 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 52 min. 1 report 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, 4:53 PM MDT (22:53 UTC)
Expired
Jul 28, 2018, 5:45 PM MDT
In force
52 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 118 km from the middle of the area, began a volume at 22:54 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

TimeReportWhereRemark
Jul 28, 5:22 PM MDTHAIL 0.54 N Wheatland, WY

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.

IssuedProductOfficeLasted
Jul 28, 2:34 PM MDTTornado WatchSPC7 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 10.9 hours before the alert went out and 269 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-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2018-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2018-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1215 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

385 
WFUS55 KCYS 282253
TORCYS
WYC015-031-282345-
/O.NEW.KCYS.TO.W.0025.180728T2253Z-180728T2345Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  West central Goshen County in southeastern Wyoming...
  Central Platte County in southeastern Wyoming...

* Until 545 PM MDT.
    
* At 453 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles northwest of Lakeview North, or 12 miles
  northwest of Wheatland, moving southeast at 25 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation. This storm has a history of 
           producing tornadoes. A new tornado may form at any time! 

  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...
  Lakeview North and Westview Circle around 515 PM MDT.
  Wheatland around 520 PM MDT.
  Y-O Ranch and Chugcreek around 525 PM MDT.
  Bordeaux around 535 PM MDT.
  Slater around 540 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 67 and
105.

This replaces the Tornado Warning which was previously in effect for 
the warned area. 

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 4236 10526 4245 10493 4207 10438 4180 10511
TIME...MOT...LOC 2253Z 335DEG 23KT 4222 10507 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Hammer
4 follow-up statements
677 
WWUS55 KCYS 282307
SVSCYS

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

WYC015-031-282345-
/O.CON.KCYS.TO.W.0025.000000T0000Z-180728T2345Z/
Goshen WY-Platte WY-
507 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM MDT FOR WEST
CENTRAL GOSHEN AND CENTRAL PLATTE COUNTIES...
    
At 506 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Lakeview North, or 8 miles north of Wheatland,
moving southeast at 25 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation. This storm has a history of 
         producing tornadoes. A new tornado may form at any time! 

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...
  Westview Circle around 515 PM MDT.
  Lakeview North around 520 PM MDT.
  Wheatland and Chugcreek around 525 PM MDT.
  Y-O Ranch around 530 PM MDT.
  Bordeaux around 540 PM MDT.
  Slater around 545 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 67 and
91.
 
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 4218 10517 4231 10473 4207 10438 4183 10504
TIME...MOT...LOC 2306Z 332DEG 23KT 4217 10499 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Hammer
889 
WWUS55 KCYS 282324
SVSCYS

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

WYC015-282333-
/O.CAN.KCYS.TO.W.0025.000000T0000Z-180728T2345Z/
Goshen WY-
524 PM MDT SAT JUL 28 2018

...THE TORNADO WARNING FOR WEST CENTRAL GOSHEN COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning will remain 
west of Goshen county for the immediate future. 

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

LAT...LON 4213 10507 4219 10480 4204 10465 4197 10466
      4183 10504
TIME...MOT...LOC 2323Z 335DEG 23KT 4207 10494 

$$

WYC031-282345-
/O.CON.KCYS.TO.W.0025.000000T0000Z-180728T2345Z/
Platte WY-
524 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM MDT FOR CENTRAL
PLATTE COUNTY...
    
At 523 PM MDT, a severe thunderstorm capable of producing a tornado
was located over Wheatland, moving southeast at 25 mph.

HAZARD...Tornado and quarter 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...
  Wheatland Now! 
  Bordeaux around 540 PM MDT.
  Slater around 545 PM MDT.

Persons in Wheatland should seek shelter immediately! 

This includes Interstate 25 in Wyoming between mile markers 67 and
86.
 
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 4213 10507 4219 10480 4204 10465 4197 10466
      4183 10504
TIME...MOT...LOC 2323Z 335DEG 23KT 4207 10494 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Hammer
444 
WWUS55 KCYS 282337
SVSCYS

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

WYC031-282345-
/O.CON.KCYS.TO.W.0025.000000T0000Z-180728T2345Z/
Platte WY-
537 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM MDT FOR
SOUTHEASTERN PLATTE COUNTY...
        
At 536 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Y-O Ranch, or near Wheatland, moving southeast at 25
mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Weather spotters reported a funnel cloud.

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...
  Slater around 545 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 67 and
81.
 
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 4208 10497 4211 10472 4204 10465 4197 10466
      4185 10499
TIME...MOT...LOC 2336Z 335DEG 23KT 4199 10489 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Hammer
250 
WWUS55 KCYS 282344
SVSCYS

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

WYC031-282354-
/O.EXP.KCYS.TO.W.0025.000000T0000Z-180728T2345Z/
Platte WY-
544 PM MDT SAT JUL 28 2018

...THE TORNADO WARNING FOR SOUTHEASTERN PLATTE COUNTY WILL EXPIRE AT
545 PM MDT...
                
The storm which prompted the warning no longer appears capable of 
producing a tornado. Therefore, the warning will be allowed to 
expire. A Severe Thunderstorm Warning has been issued for southeast 
Platte and southwest Goshen counties until 630 PM MDT. 

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

LAT...LON 4208 10497 4211 10472 4204 10465 4197 10466
      4185 10499
TIME...MOT...LOC 2344Z 335DEG 23KT 4196 10487 

$$

Hammer

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 6:08 PM MDTSevere Thunderstorm WarningCYSAlbany, Converse, Platte52 min
Jul 27, 7:04 PM MDTSpecial Weather StatementCYSPlatte41 min
Jul 27, 7:09 PM MDTSevere Thunderstorm WarningCYSAlbany, Platte29 min
Jul 27, 8:01 PM MDTSevere Thunderstorm WarningCYSConverse29 min
Jul 27, 8:25 PM MDTSevere Thunderstorm WarningCYSConverse50 min
Jul 27, 9:03 PM MDTSevere Thunderstorm WarningCYSConverse42 min
Jul 27, 9:25 PM MDTSpecial Weather StatementCYSConverse50 min
Jul 27, 9:31 PM MDTSevere Thunderstorm WarningCYSConverse29 min
Jul 27, 9:36 PM MDTSpecial Weather StatementCYSNiobrara39 min
Jul 28, 3:02 PM MDTSevere Thunderstorm WarningCYSConverse43 min
Jul 28, 3:12 PM MDTTornado WarningCYSConverse48 min
Jul 28, 3:27 PM MDTTornado WarningCYSGoshen, Platte33 min
Jul 28, 3:32 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara, Platte43 min
Jul 28, 3:49 PM MDTTornado WarningCYSAlbany, Converse, Platte41 min
Jul 28, 3:55 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie35 min
Jul 28, 4:26 PM MDTTornado Warning Tornado observedConsiderable damage threatCYSAlbany, Converse, Platte34 min
Jul 28, 4:29 PM MDTSevere Thunderstorm WarningCYSLaramie46 min
Jul 28, 5:30 PM MDTSpecial Weather StatementCYSConverse45 min
Jul 28, 5:43 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte47 min
Jul 28, 5:56 PM MDTSevere Thunderstorm WarningCYSConverse64 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.