Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 32, NWS Cheyenne, WY

July 29, 2018Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 29, 2018, 3:14 PM MDT for Laramie County, Wyoming. It was in force for 29 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 29, 2018, 3:14 PM MDT (21:14 UTC)
Expired: Jul 29, 2018, 3:43 PM MDT
In force: 29 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.75 in

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 15 km from the middle of the area, began a volume at 21:16 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, 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, 9.2 hours before the alert went out and 181 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.

884 
WFUS55 KCYS 292114
TORCYS
WYC021-292200-
/O.NEW.KCYS.TO.W.0032.180729T2114Z-180729T2200Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  South central Laramie County in southeastern Wyoming...

* Until 400 PM MDT.

* At 313 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles east of Cheyenne, moving southeast at 20 mph.

This includes southeastern portions of the city of Cheyenne.

  HAZARD...Tornado and baseball size hail.

  SOURCE...Weather spotters reported 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 tornadic thunderstorm will remain over mainly rural areas of
  south central Laramie County, including the following locations...
  Fox Farm-College.

This includes Interstate 80 in Wyoming between mile markers 362 and
379.
 
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 4112 10481 4123 10464 4101 10418 4100 10475
TIME...MOT...LOC 2113Z 321DEG 18KT 4112 10466 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Hammer

1 follow-up statement

200 
WWUS55 KCYS 292143
SVSCYS

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

WYC021-292152-
/O.CAN.KCYS.TO.W.0032.000000T0000Z-180729T2200Z/
Laramie WY-
343 PM MDT SUN JUL 29 2018

...THE TORNADO WARNING FOR SOUTH CENTRAL LARAMIE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Warning remains in effect for the warned area.

A Tornado Watch remains in effect until 900 PM MDT for southeastern
Wyoming.

LAT...LON 4112 10481 4123 10464 4101 10418 4100 10475
TIME...MOT...LOC 2140Z 321DEG 18KT 4100 10454 

$$

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, 2:28 PM MDT	Tornado Warning	CYS	Laramie	47 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, 3:19 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.