Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 310, NWS Cheyenne, WY

August 11, 2019Converse County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 11, 2019, 3:41 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 34 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: Aug 11, 2019, 3:41 PM MDT (21:41 UTC)
Expired: Aug 11, 2019, 4:15 PM MDT
In force: 34 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Converse County, WY, Niobrara County, WY

The radar

The Rapid City radar (KUDX), 198 km from the middle of the area, began a volume at 21:44 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
Aug 11, 1:24 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 9.7 hours before the alert went out and 191 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: 1612 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

367 
WUUS55 KCYS 112141
SVRCYS
WYC009-027-112215-
/O.NEW.KCYS.SV.W.0310.190811T2141Z-190811T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
341 PM MDT Sun Aug 11 2019

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Western Niobrara County in east central Wyoming...
  East central Converse County in east central Wyoming...

* Until 415 PM MDT.

* At 341 PM MDT, severe thunderstorms were located along a line
  extending from 12 miles west of Morrisey to 12 miles east of
  Douglas, moving northeast at 20 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Keeline, Lance Creek, Manning Ranch and Lost Springs. 

This includes Interstate 25 in Wyoming between mile markers 129 and
130.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4269 10476 4268 10527 4350 10468 4350 10424
TIME...MOT...LOC 2141Z 240DEG 19KT 4348 10464 4270 10515 

HAIL...1.25IN
WIND...60MPH
 
$$

Worley

1 follow-up statement

748 
WWUS55 KCYS 112211
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
411 PM MDT Sun Aug 11 2019

WYC009-027-112221-
/O.EXP.KCYS.SV.W.0310.000000T0000Z-190811T2215Z/
Niobrara WY-Converse WY-
411 PM MDT Sun Aug 11 2019

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN NIOBRARA AND EAST
CENTRAL CONVERSE COUNTIES WILL EXPIRE AT 415 PM MDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
east central Wyoming.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4269 10476 4268 10527 4350 10468 4350 10424
TIME...MOT...LOC 2211Z 240DEG 19KT 4355 10447 4277 10498 

$$

Worley

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 1:05 AM MDT	Red Flag Warning	CYS		42 hr
Aug 11, 12:48 PM MDT	Special Weather Statement	CYS	Laramie	42 min
Aug 11, 1:28 PM MDT	Special Weather Statement	CYS	Laramie	47 min
Aug 11, 1:42 PM MDT	Special Weather Statement	CYS	Laramie	48 min
Aug 11, 1:57 PM MDT	Severe Thunderstorm Warning	CYS	Converse	48 min
Aug 11, 2:03 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr
Aug 11, 2:04 PM MDT	Special Weather Statement	CYS	Converse	41 min
Aug 11, 2:13 PM MDT	Special Weather Statement	CYS	Converse	47 min
Aug 11, 2:14 PM MDT	Special Weather Statement	CYS	Laramie	46 min
Aug 11, 2:17 PM MDT	Special Weather Statement	CYS	Platte	43 min
Aug 11, 2:23 PM MDT	Severe Thunderstorm Warning	CYS	Converse	37 min
Aug 11, 2:25 PM MDT	Special Weather Statement	CYS	Laramie	50 min
Aug 11, 2:38 PM MDT	Special Weather Statement	CYS	Converse	52 min
Aug 11, 2:43 PM MDT	Severe Thunderstorm Warning	CYS	Converse	17 min
Aug 11, 2:47 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	43 min
Aug 11, 2:54 PM MDT	Tornado Warning	CYS	Laramie	11 min
Aug 11, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Converse	47 min
Aug 11, 3:07 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr
Aug 11, 3:14 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr
Aug 11, 3:16 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	44 min
Aug 11, 3:28 PM MDT	Flash Flood Warning	CYS	Laramie	3 hr
Aug 11, 3:28 PM MDT	Special Weather Statement	CYS	Platte	47 min
Aug 11, 3:29 PM MDT	Special Weather Statement	CYS	Niobrara	46 min
Aug 11, 3:48 PM MDT	Special Weather Statement	CYS	Platte	42 min
Aug 11, 3:56 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	34 min
Aug 11, 4:06 PM MDT	Areal Flood Advisory	CYS	Converse, Niobrara, Platte	3 hr
Aug 11, 4:08 PM MDT	Special Weather Statement	CYS	Goshen	52 min
Aug 11, 4:10 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	23 min
Aug 11, 4:36 PM MDT	Special Weather Statement	CYS	Niobrara	39 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2019 Every severe thunderstorm warning in 2019

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.