Alert archive / Nebraska / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 252, NWS Cheyenne, WY

July 17, 2019Sioux County, Nebraska; Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 17, 2019, 5:40 PM MDT for Sioux County, Nebraska; Niobrara County, Wyoming. It was in force for 50 min. 5 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 17, 2019, 5:40 PM MDT (23:40 UTC)
Expired: Jul 17, 2019, 6:30 PM MDT
In force: 50 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Sioux County, NE, Niobrara County, WY

What was reported inside it

Time	Report	Where	Remark
Jul 17, 6:00 PM MDT	TSTM WND DMG	25 Ne Lusk, WY	TREE LIMBS UP TO 3-4 INCHES IN DIAMETER BROKEN DURING TORNADO WARNED STORM
Jul 17, 6:05 PM MDT	TORNADO	22 Ne Lusk, WY	CONFIRMED TORNADO ON THE GROUND. BROKEN BRANCHES. FOUR TO FIVE HOMES WITHOUT POWER. PING PONG BALL SIZE HAIL AND HEAVY RAIN.
Jul 17, 6:05 PM MDT	TORNADO	22 Ne Lusk, WY	CONFIRMED TORNADO ON THE GROUND.
Jul 17, 6:18 PM MDT	FUNNEL CLOUD	18 N Harrison, NE	FUNNEL CLOUD DROPPING AND LIFTING.
Jul 17, 6:25 PM MDT	TORNADO	15 N Harrison, NE	CONFIRMED TORNADO ON THE GROUND.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.7 hours before the alert went out and 151 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: 180 J/kg
Mixed-layer CIN: -389 J/kg
Mixed-layer LCL: 1287 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

307 
WUUS55 KCYS 172340
SVRCYS
NEC165-WYC027-180030-
/O.NEW.KCYS.SV.W.0252.190717T2340Z-190718T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
540 PM MDT Wed Jul 17 2019

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sioux County in the Panhandle of Nebraska...
  East central Niobrara County in east central Wyoming...

* Until 630 PM MDT.

* At 539 PM MDT, a severe thunderstorm was located 12 miles south of
  Redbird, or 22 miles northeast of Lusk, moving east at 30 mph.

  HAZARD...Two inch hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  northwestern Sioux and east central Niobrara Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4313 10405 4300 10405 4300 10373 4274 10386
      4297 10445 4320 10432
TIME...MOT...LOC 2339Z 289DEG 25KT 4305 10428 

HAIL...2.00IN
WIND...60MPH
 
$$

Brothers

1 follow-up statement

489 
WWUS55 KCYS 172357
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
557 PM MDT Wed Jul 17 2019

NEC165-WYC027-180030-
/O.CON.KCYS.SV.W.0252.000000T0000Z-190718T0030Z/
Sioux NE-Niobrara WY-
557 PM MDT Wed Jul 17 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM MDT
FOR NORTHWESTERN SIOUX AND EAST CENTRAL NIOBRARA COUNTIES...

At 556 PM MDT, a severe thunderstorm was located 17 miles southeast
of Redbird, or 24 miles northeast of Lusk, moving east at 30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northwestern Sioux and east central Niobrara Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4300 10373 4274 10386 4295 10430 4314 10418
      4310 10405 4300 10405
TIME...MOT...LOC 2356Z 289DEG 25KT 4301 10412 

HAIL...1.50IN
WIND...60MPH
 
$$

Brothers

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 6:05 PM MDT	Special Weather Statement	CYS	Cheyenne	40 min
Jul 16, 6:13 PM MDT	Special Weather Statement	CYS	Morrill	47 min
Jul 16, 7:08 PM MDT	Special Weather Statement	CYS	Cheyenne	52 min
Jul 16, 8:11 PM MDT	Special Weather Statement	CYS	Cheyenne	34 min
Jul 16, 6:10 PM MDT	Special Weather Statement	CYS	Niobrara	35 min
Jul 17, 1:13 AM MDT	Fire Weather Watch	CYS		13 hr
Jul 17, 2:30 PM MDT	Red Flag Warning	CYS		29 hr
Jul 17, 4:18 PM MDT	Special Weather Statement	CYS	Niobrara	27 min
Jul 17, 4:32 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	43 min
Jul 17, 5:06 PM MDT	Areal Flood Advisory	CYS	Niobrara	92 min
Jul 17, 5:06 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	39 min
Jul 17, 5:26 PM MDT	Areal Flood Advisory	CYS	Niobrara	72 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2019 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.