Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Cheyenne, WY

May 17, 2018Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 17, 2018, 5:14 PM MDT for Scotts Bluff County, Sioux County, Nebraska. It was in force for 61 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 17, 2018, 5:14 PM MDT (23:14 UTC)
Expired: May 17, 2018, 6:15 PM MDT
In force: 61 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

The radar

The Cheyenne radar (KCYS), 134 km from the middle of the area, began a volume at 23:17 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
May 17, 4:57 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.2 hours before the alert went out and 232 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: 2698 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

319 
WUUS55 KCYS 172314
SVRCYS
NEC157-165-180015-
/O.NEW.KCYS.SV.W.0021.180517T2314Z-180518T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
514 PM MDT THU MAY 17 2018

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Scotts Bluff County in the Panhandle of Nebraska...
  Southeastern Sioux County in the Panhandle of Nebraska...

* Until 615 PM MDT

* At 513 PM MDT, severe thunderstorms were located along a line
  extending from near Lake Alice to 11 miles west of Wildcat Hills
  Campground, 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.

* Severe thunderstorms will be near, 
  Lake Alice around 520 PM MDT.
  Wildcat Hills Campground, Wildcat Hills State Recreation Area and 
  Hubbard Hill around 545 PM MDT.
  Gering and Scotts Bluff National Monument around 600 PM MDT.
  Terrytown around 605 PM MDT.
  Scottsbluff around 610 PM MDT.
  Minatare, Scottsbluff Airport, Lake Minatare Campground and Lake 
  Minatare around 615 PM MDT.

Other locations impacted by these severe thunderstorms include
Melbeta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4208 10341 4170 10348 4170 10396 4214 10369
TIME...MOT...LOC 2313Z 230DEG 16KT 4204 10364 4168 10389 

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

Rubin

3 follow-up statements

484 
WWUS55 KCYS 172334
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
534 PM MDT THU MAY 17 2018

NEC157-165-180015-
/O.CON.KCYS.SV.W.0021.000000T0000Z-180518T0015Z/
Scotts Bluff NE-Sioux NE-
534 PM MDT THU MAY 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR SCOTTS BLUFF AND SOUTHEASTERN SIOUX COUNTIES...

At 533 PM MDT, severe thunderstorms were located along a line
extending from 8 miles northeast of Lake Alice to 6 miles south of
Hubbard Hill, 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.

These severe storms will be near...
  Terrytown around 605 PM MDT.
  Scottsbluff around 610 PM MDT.
  Minatare and Scottsbluff Airport around 615 PM MDT.

Other locations impacted by these severe thunderstorms include
Melbeta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4208 10341 4170 10348 4170 10396 4214 10369
TIME...MOT...LOC 2333Z 230DEG 16KT 4210 10355 4174 10380 

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

Rubin

711 
WWUS55 KCYS 180001
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
601 PM MDT THU MAY 17 2018

NEC157-165-180015-
/O.CON.KCYS.SV.W.0021.000000T0000Z-180518T0015Z/
Scotts Bluff NE-Sioux NE-
601 PM MDT THU MAY 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR SCOTTS BLUFF AND SOUTHEASTERN SIOUX COUNTIES...

At 601 PM MDT, a severe thunderstorm was located over Wildcat Hills
Campground, or 10 miles south of Scottsbluff, moving north at 25 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 storm will be near...
  Scottsbluff, Gering, Terrytown, Scotts Bluff National Monument, 
  Scottsbluff Airport and Hubbard Hill around 615 PM MDT.

Other locations impacted by this severe thunderstorm include Melbeta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4208 10341 4170 10348 4170 10396 4214 10369
TIME...MOT...LOC 0001Z 186DEG 23KT 4171 10369 

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

Rubin

636 
WWUS55 KCYS 180012
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
612 PM MDT THU MAY 17 2018

NEC157-165-180022-
/O.EXP.KCYS.SV.W.0021.000000T0000Z-180518T0015Z/
Scotts Bluff NE-Sioux NE-
612 PM MDT THU MAY 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR SCOTTS BLUFF AND SOUTHEASTERN
SIOUX COUNTIES WILL EXPIRE AT 615 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,
gusty winds and heavy rain are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4208 10341 4170 10348 4170 10396 4214 10369
TIME...MOT...LOC 0012Z 230DEG 16KT 4174 10364 

$$

Rubin

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 5:03 PM MDT	Special Weather Statement	CYS	Scotts Bluff	57 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2018 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.