Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 13, NWS Cheyenne, WY

May 31, 2017Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 31, 2017, 5:55 PM MDT for Goshen County, Wyoming; Scotts Bluff County, Sioux County, Nebraska. It was in force for 35 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: May 31, 2017, 5:55 PM MDT (23:55 UTC)
Expired: May 31, 2017, 6:30 PM MDT
In force: 35 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 115 km from the middle of the area, began a volume at 23:57 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 nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.9 hours before the alert went out and 246 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: 2251 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

251 
WUUS55 KCYS 312355
SVRCYS
NEC157-165-WYC015-010030-
/O.NEW.KCYS.SV.W.0013.170531T2355Z-170601T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
555 PM MDT WED MAY 31 2017

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northwestern Scotts Bluff County in the Panhandle of Nebraska...
  Southwestern Sioux County in the Panhandle of Nebraska...
  East central Goshen County in southeastern Wyoming...

* Until 630 PM MDT

* At 554 PM MDT, a severe thunderstorm was located near Torrington,
  moving northeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

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

* this severe thunderstorm will remain over mainly rural areas of
  northwestern Scotts Bluff...southwestern Sioux and east central
  Goshen Counties, including the following locations: Henry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4195 10419 4205 10421 4224 10395 4197 10381
TIME...MOT...LOC 2354Z 244DEG 16KT 4203 10415 

HAIL...1.00IN
WIND...60MPH
 
$$

Trudel

2 follow-up statements

037 
WWUS55 KCYS 010009
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
609 PM MDT WED MAY 31 2017

NEC157-165-WYC015-010030-
/O.CON.KCYS.SV.W.0013.000000T0000Z-170601T0030Z/
Scotts Bluff NE-Sioux NE-Goshen WY-
609 PM MDT WED MAY 31 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM MDT
FOR NORTHWESTERN SCOTTS BLUFF...SOUTHWESTERN SIOUX AND EAST CENTRAL
GOSHEN COUNTIES...

At 608 PM MDT, a severe thunderstorm was located east of Torrington, 
moving northeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Morrill and Henry. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4197 10415 4207 10413 4224 10395 4197 10381
TIME...MOT...LOC 0008Z 244DEG 16KT 4206 10407 

HAIL...1.00IN
WIND...60MPH
 
$$

Trudel

433 
WWUS55 KCYS 010022
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
622 PM MDT WED MAY 31 2017

NEC157-165-WYC015-010032-
/O.EXP.KCYS.SV.W.0013.000000T0000Z-170601T0030Z/
Scotts Bluff NE-Sioux NE-Goshen WY-
622 PM MDT WED MAY 31 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SCOTTS BLUFF...
SOUTHWESTERN SIOUX AND EAST CENTRAL GOSHEN COUNTIES WILL EXPIRE AT
630 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 4197 10415 4207 10413 4224 10395 4197 10381
TIME...MOT...LOC 0022Z 244DEG 16KT 4209 10400 

$$

Trudel

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 2:17 PM MDT	Special Weather Statement	CYS	Laramie	43 min
May 31, 3:46 PM MDT	Special Weather Statement	CYS	Goshen	44 min
May 31, 4:59 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	46 min
May 31, 5:48 PM MDT	Special Weather Statement	CYS	Goshen	27 min
May 31, 4:02 PM MDT	Special Weather Statement	CYS	Kimball	43 min
May 31, 5:18 PM MDT	Special Weather Statement	CYS	Scotts Bluff	42 min
May 31, 5:37 PM MDT	Special Weather Statement	CYS	Kimball	38 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2017 Severe Thunderstorm Warnings in Wyoming, 2017 Every severe thunderstorm warning in 2017

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.