Alert archive / Nebraska / Special Weather Statements in 2018

Special Weather Statement, NWS North Platte, NE

July 20, 2018Sheridan County, Nebraska

NWS North Platte, NE issued this special weather statement at Jul 20, 2018, 9:21 AM MDT for Sheridan County, Nebraska. It was in force for 54 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: Jul 20, 2018, 9:21 AM MDT (15:21 UTC)
Expired: Jul 20, 2018, 10:15 AM MDT
In force: 54 min
Issued by: NWS North Platte, NE

County Sheridan County, NE

The radar

The Rapid City radar (KUDX), 149 km from the middle of the area, began a volume at 15:24 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, 3.4 hours before the alert went out and 145 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: 200 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 1732 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

969 
WWUS83 KLBF 201521
SPSLBF

Special Weather Statement
National Weather Service North Platte NE
921 AM MDT FRI JUL 20 2018
 
NEZ004-094-201615-
Sheridan NE-Western Cherry NE-
921 AM MDT FRI JUL 20 2018

...SPECIAL WEATHER STATEMENT...

At 921 AM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near White Clay to 14 miles southwest of
Merriman. Movement was east at 35 mph.

Half inch hail and winds in excess of 30 mph will be possible with
these storms.

Locations impacted include...
Gordon, Merriman, White Clay, Clinton, Intersection of Highway 87 and
Craven Creek Road, Highway 61 crossing the Snake River, Lone Butte,
Irwin, Intersection of Highway 87 and Larabee Road, Mount Maria,
Intersection of Highway 20 and Irwin Road, Shell Lake State Wildlife
Management Area, Rock Hill, Bayonne, Intersection of Highway 27 and
Mills Road, Pine Ridge, Hoover Lake, Highway 61 Crossing The Niobrara
River and Intersection of Highway 61 and Shadbolt Road.

This includes the following highways...
 Highway 20 between mile markers 95 and 137.
 Highway 61 between mile markers 198 and 226.

LAT...LON 4300 10222 4291 10157 4243 10175 4287 10270
      4300 10261
TIME...MOT...LOC 1521Z 289DEG 29KT 4294 10256 4275 10186 

$$

Kulik

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:21 PM MDT	Special Weather Statement	LBF	Dawson	24 min
Jul 20, 7:40 AM MDT	Special Weather Statement	LBF	Custer	50 min
Jul 20, 8:34 AM MDT	Special Weather Statement	LBF	Blaine, Custer, Logan, Thomas	71 min

Nearby

Special Weather Statements in Nebraska, 2018 Every special weather statement 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.