Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 252, NWS North Platte, NE

August 6, 2018Sheridan County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 6, 2018, 6:20 PM MDT for Sheridan County, Nebraska. It was in force for 40 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 6, 2018, 6:20 PM MDT (00:20 UTC)
Expired: Aug 6, 2018, 7:00 PM MDT
In force: 40 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Sheridan County, NE

The radar

The Rapid City radar (KUDX), 136 km from the middle of the area, began a volume at 00:19 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 00:00Z, 0.3 hours before the alert went out and 130 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: 49 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 1703 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

687 
WUUS53 KLBF 070020
SVRLBF
NEC161-070100-
/O.NEW.KLBF.SV.W.0252.180807T0020Z-180807T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
620 PM MDT MON AUG 6 2018

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sheridan County in the Panhandle of Nebraska...

* Until 700 PM MDT.

* At 619 PM MDT, a severe thunderstorm was located near Slim Buttes,
  or 10 miles west of Pine Ridge, moving southeast at 30 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...
  Intersection of Beaver Creek Road and White Clay Creek Road,
  Intersection of Highway 87 and Larabee Road, Mount Maria and
  Metcalf State Wildlife Management Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4300 10264 4285 10237 4271 10271 4288 10280
      4290 10279 4300 10279
TIME...MOT...LOC 0019Z 318DEG 25KT 4299 10276 

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

Roberg

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 6:31 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden, Keith	44 min
Aug 6, 7:06 PM MDT	Special Weather Statement	LBF	Keya Paha	39 min
Aug 6, 7:08 PM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	52 min
Aug 6, 7:47 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	43 min
Aug 6, 7:59 PM MDT	Special Weather Statement	LBF	Boyd	46 min
Aug 7, 5:06 PM MDT	Special Weather Statement	LBF	Blaine, Logan, Thomas	39 min
Aug 7, 5:22 PM MDT	Severe Thunderstorm Warning	LBF	Logan, McPherson, Thomas	38 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.