Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 30, NWS Cheyenne, WY

July 29, 2018Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 29, 2018, 2:28 PM MDT for Laramie County, Wyoming. It was in force for 47 min. 13 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 29, 2018, 2:28 PM MDT (20:28 UTC)
Expired: Jul 29, 2018, 3:15 PM MDT
In force: 47 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 18 km from the middle of the area, began a volume at 20:29 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 29, 2:40 PM MDT	HAIL 1.25	10 N Cheyenne, WY
Jul 29, 2:42 PM MDT	HAIL 1.75	8 Nne Cheyenne, WY	LATE REPORT VIA SOCIAL MEDIA. NEAR HIGHWAY 85 NORTH OF CHEYENNE.
Jul 29, 2:45 PM MDT	HAIL 1	4 Nw Cheyenne, WY
Jul 29, 2:45 PM MDT	HAIL 1.75	10 N Cheyenne, WY
Jul 29, 2:45 PM MDT	TORNADO	6 N Cheyenne, WY	BRIEF TOUCHDOWN OBSERVED ALONG KERSEY DRIVE NORTH OF CHEYENNE.
Jul 29, 2:59 PM MDT	HAIL 2	3 Ne Cheyenne, WY
Jul 29, 3:00 PM MDT	HAIL 1.5	5 Ne Cheyenne, WY
Jul 29, 3:00 PM MDT	HAIL 1.75	5 E Cheyenne, WY	DELL RANGE AND GREEN MOUNTAIN.BROKEN WINDOWS AND SKY LIGHTS AS WELL AS TREE DAMAGE. THIS OCCURRED IN THE SADDLE RIDGE AND DAKOTA CROSSING NEIGHBORHOODS. THIS REPORT CAME IN AFTER THE FACT. DAMAGE LIKELY OCCURRED WITH THE STORM AROUND 3 PM.
Jul 29, 3:04 PM MDT	HAIL 1.25	4 E Cheyenne, WY
Jul 29, 3:06 PM MDT	HAIL 1.5	4 E Cheyenne, WY
Jul 29, 3:07 PM MDT	HAIL 1.75	2 Ene Cheyenne, WY
Jul 29, 3:10 PM MDT	TSTM WND GST 50	4 E Cheyenne, WY	ESTIMATE 50-70 MPH WINDS
Jul 29, 3:14 PM MDT	HAIL 1.75	2 E Cheyenne, 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.

Issued	Product	Office	Lasted
Jul 29, 1:07 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 8.5 hours before the alert went out and 210 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: 181 J/kg
Mixed-layer CIN: -407 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

512 
WFUS55 KCYS 292028
TORCYS
WYC021-292115-
/O.NEW.KCYS.TO.W.0030.180729T2028Z-180729T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
228 PM MDT SUN JUL 29 2018

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Western Laramie County in southeastern Wyoming...

* Until 315 PM MDT.
    
* At 228 PM MDT, a severe thunderstorm capable of producing a tornado
  was located near Whitaker, or 15 miles northwest of Cheyenne,
  moving southeast at 25 mph.

  HAZARD...Tornado and hail up to two inches in diameter.

  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...
  North Cheyenne around 255 PM MDT.
  Frontier Park, Warren AFB and Warren Af Base around 300 PM MDT.
  Ranchettes around 305 PM MDT.
  Cheyenne and South Greeley around 310 PM MDT.

Other locations impacted by this tornadic thunderstorm include Fox
Farm-College and South Greeley High.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 2 and 36.
 Interstate 80 in Wyoming between mile markers 352 and 386.

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 4146 10501 4152 10484 4113 10431 4101 10499
TIME...MOT...LOC 2028Z 335DEG 23KT 4135 10492 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Hammer

2 follow-up statements

480 
WWUS55 KCYS 292045
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
245 PM MDT SUN JUL 29 2018

WYC021-292115-
/O.CON.KCYS.TO.W.0030.000000T0000Z-180729T2115Z/
Laramie WY-
245 PM MDT SUN JUL 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM MDT FOR SOUTH
CENTRAL LARAMIE COUNTY...
    
At 244 PM MDT, a severe thunderstorm capable of producing a tornado
was located near North Cheyenne, or 8 miles northwest of Cheyenne,
moving southeast at 25 mph.

HAZARD...Tornado and two inch 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...
  North Cheyenne around 255 PM MDT.
  Frontier Park, Warren AFB and Warren Af Base around 300 PM MDT.
  South Greeley and Ranchettes around 305 PM MDT.
  Cheyenne around 310 PM MDT.

THIS INCLUDES THE CITY OF CHEYENNE.

Other locations impacted by this tornadic thunderstorm include Fox
Farm-College and South Greeley High.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 2 and 26.
 Interstate 80 in Wyoming between mile markers 356 and 386.

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 4134 10494 4141 10477 4113 10431 4102 10493
TIME...MOT...LOC 2044Z 335DEG 23KT 4125 10486 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Hammer

884 
WWUS55 KCYS 292100
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
300 PM MDT SUN JUL 29 2018

WYC021-292115-
/O.CON.KCYS.TO.W.0030.000000T0000Z-180729T2115Z/
Laramie WY-
300 PM MDT SUN JUL 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM MDT FOR SOUTH
CENTRAL LARAMIE COUNTY...
    
At 259 PM MDT, a severe thunderstorm capable of producing a tornado
was located over Cheyenne, moving southeast at 25 mph.

IF IN CHEYENNE...SEEK SHELTER NOW! 

HAZARD...Developing tornado and two inch 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...
  South Greeley around 305 PM MDT.

Other locations impacted by this tornadic thunderstorm include Fox
Farm-College and South Greeley High.

This includes the following highways...
 Interstate 25 in Wyoming between mile markers 7 and 16.
 Interstate 80 in Wyoming between mile markers 359 and 385.

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 4119 10489 4133 10465 4113 10431 4104 10484
TIME...MOT...LOC 2059Z 335DEG 23KT 4116 10480 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 6:28 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	35 min
Jul 28, 6:46 PM MDT	Special Weather Statement	CYS	Niobrara	44 min
Jul 28, 6:58 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jul 28, 7:05 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min
Jul 28, 7:18 PM MDT	Special Weather Statement	CYS	Platte	42 min
Jul 28, 7:36 PM MDT	Special Weather Statement	CYS	Platte	39 min
Jul 28, 7:44 PM MDT	Severe Thunderstorm Warning	CYS	Platte	46 min
Jul 28, 8:30 PM MDT	Special Weather Statement	CYS	Goshen	45 min
Jul 29, 3:22 AM MDT	Red Flag Warning	CYS		16 hr
Jul 29, 1:01 PM MDT	Special Weather Statement	CYS	Goshen	44 min
Jul 29, 1:05 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	25 min
Jul 29, 1:13 PM MDT	Special Weather Statement	CYS	Platte	47 min
Jul 29, 1:25 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	50 min
Jul 29, 1:28 PM MDT	Severe Thunderstorm Warning	CYS	Platte	47 min
Jul 29, 1:39 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	51 min
Jul 29, 1:44 PM MDT	Tornado Warning	CYS	Laramie, Platte	14 min
Jul 29, 1:57 PM MDT	Tornado Warning Tornado observed	CYS	Laramie	33 min
Jul 29, 2:11 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	49 min
Jul 29, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	25 min
Jul 29, 2:26 PM MDT	Tornado Warning	CYS	Laramie	34 min
Jul 29, 2:53 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jul 29, 2:54 PM MDT	Tornado Warning	CYS	Laramie	36 min
Jul 29, 3:14 PM MDT	Tornado Warning	CYS	Laramie	29 min
Jul 29, 3:19 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	41 min
Jul 29, 3:29 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	61 min
Jul 29, 3:30 PM MDT	Severe Thunderstorm Warning	CYS	Carbon	45 min
Jul 29, 3:41 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	30 min
Jul 29, 3:42 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	33 min
Jul 29, 3:46 PM MDT	Flash Flood Warning	CYS	Laramie	3 hr
Jul 29, 4:04 PM MDT	Special Weather Statement	CYS	Carbon	41 min
Jul 29, 4:08 PM MDT	Special Weather Statement	CYS	Albany	52 min
Jul 29, 4:17 PM MDT	Tornado Warning	CYS	Albany, Laramie, Platte	43 min
Jul 29, 4:21 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	39 min
Jul 29, 4:21 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	39 min
Jul 29, 4:36 PM MDT	Special Weather Statement	CYS		39 min
Jul 29, 4:42 PM MDT	Special Weather Statement	CYS	Platte	48 min
Jul 29, 4:43 PM MDT	Special Weather Statement	CYS	Albany	47 min
Jul 29, 4:45 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	45 min
Jul 29, 4:55 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	19 min
Jul 29, 4:56 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	34 min
Jul 29, 4:58 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Carbon	47 min
Jul 29, 5:03 PM MDT	Special Weather Statement	CYS	Laramie	42 min
Jul 29, 5:25 PM MDT	Special Weather Statement	CYS	Goshen, Platte	50 min
Jul 29, 5:29 PM MDT	Severe Thunderstorm Warning	CYS	Albany	46 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.