Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 24, NWS Cheyenne, WY

July 28, 2018Albany County, Converse County, Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 28, 2018, 4:26 PM MDT for Albany County, Converse County, Platte County, Wyoming. It was in force for 34 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, 4:26 PM MDT (22:26 UTC)
Expired: Jul 28, 2018, 5:00 PM MDT
In force: 34 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Damage threat: Considerable
Hail: 2.0 in

Counties Albany County, WY, Converse County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 137 km from the middle of the area, began a volume at 22:26 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, 4:39 PM MDT	TORNADO	23 Sw Glendo, WY	MOVING SOUTHEAST
Jul 28, 4:52 PM MDT	TSTM WND GST 62	Esterbrook, WY	ESTERBROOK RAWS SITE.

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

Rapid City, SD (KRAP), launched 12:00Z, 10.4 hours before the alert went out and 270 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: 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.

980 
WFUS55 KCYS 282226
TORCYS
WYC001-009-031-282300-
/O.NEW.KCYS.TO.W.0024.180728T2226Z-180728T2300Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Northeastern Albany County in southeastern Wyoming...
  Northern Platte County in southeastern Wyoming...
  Southern Converse County in east central Wyoming...

* Until 500 PM MDT.

* At 424 PM MDT, a confirmed large tornado was located over 
  Esterbrook Campground, or 22 miles south of Douglas, moving 
  southeast at 35 mph.

  HAZARD...Damaging tornado and two inch diameter hail. 

  SOURCE...Weather spotters confirmed tornado.

  IMPACT...You are in a life-threatening situation. Flying debris 
           may be deadly to those caught without shelter. Mobile 
           homes will be destroyed. Considerable damage to homes, 
           businesses, and vehicles is likely and complete 
           destruction is possible.

* The tornado will be near...
  Harris Park around 435 PM MDT.
  Westview Circle and Lakeview North around 500 PM MDT.

This includes Interstate 25 in Wyoming between mile markers 82 and
107.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, 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 4250 10545 4258 10517 4217 10474 4197 10528
TIME...MOT...LOC 2224Z 328DEG 35KT 4244 10529 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...2.00IN

$$

Hammer

2 follow-up statements

035 
WWUS55 KCYS 282238
SVSCYS

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

WYC001-009-282247-
/O.CAN.KCYS.TO.W.0024.000000T0000Z-180728T2300Z/
Albany WY-Converse WY-
438 PM MDT SAT JUL 28 2018

...THE TORNADO WARNING FOR NORTHEASTERN ALBANY AND SOUTHERN CONVERSE
COUNTIES 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 4246 10528 4248 10507 4217 10474 4198 10526
TIME...MOT...LOC 2237Z 324DEG 21KT 4239 10523 

$$

WYC031-282300-
/O.CON.KCYS.TO.W.0024.000000T0000Z-180728T2300Z/
Platte WY-
438 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM MDT FOR NORTHERN
PLATTE COUNTY...
    
At 437 PM MDT, a confirmed tornado was located near Esterbrook
Campground, or 26 miles south of Douglas, moving southeast at 25 mph.

HAZARD...Damaging tornado and two inch hail.

SOURCE...Weather spotters confirmed tornado.

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
northern Platte County.

This includes Interstate 25 in Wyoming between mile markers 82 and
107.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4246 10528 4248 10507 4217 10474 4198 10526
TIME...MOT...LOC 2237Z 324DEG 21KT 4239 10523 

TORNADO...OBSERVED
HAIL...2.00IN

$$

Hammer

888 
WWUS55 KCYS 282249
SVSCYS

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

WYC031-282300-
/O.CON.KCYS.TO.W.0024.000000T0000Z-180728T2300Z/
Platte WY-
449 PM MDT SAT JUL 28 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM MDT FOR NORTHERN
PLATTE COUNTY...
    
At 449 PM MDT, a severe thunderstorm capable of producing a tornado
was located 9 miles east of Harris Park, or 21 miles northwest of
Wheatland, moving southeast at 15 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.

Locations impacted include...
Sibley Peak, Westview Circle and Lakeview North. 

This includes Interstate 25 in Wyoming between mile markers 82 and
107.
 
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 4242 10523 4247 10506 4217 10474 4200 10522
TIME...MOT...LOC 2249Z 323DEG 15KT 4233 10514 

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

$$

Hammer

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, 3:27 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, 4:29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.