Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 108, NWS North Platte, NE

August 5, 2021Brown County, Cherry County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 5, 2021, 5:39 PM CDT for Brown County, Cherry County, Nebraska. It was in force for 21 min. 1 report 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: Aug 5, 2021, 5:39 PM CDT (22:39 UTC)
Expired: Aug 5, 2021, 6:00 PM CDT
In force: 21 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

Counties Brown County, NE, Cherry County, NE

The radar

The North Platte radar (KLNX), 55 km from the middle of the area, began a volume at 22:43 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.

What was reported inside it

Time	Report	Where	Remark
Aug 5, 5:45 PM CDT	TSTM WND GST 60	19 S Johnstown, NE

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

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.7 hours before the alert went out and 141 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: 630 J/kg
Mixed-layer CIN: -219 J/kg
Mixed-layer LCL: 1661 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

664 
WUUS53 KLBF 052239
SVRLBF
NEC017-031-052300-
/O.NEW.KLBF.SV.W.0108.210805T2239Z-210805T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
539 PM CDT Thu Aug 5 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  East central Cherry County in north central Nebraska...
  Southwestern Brown County in north central Nebraska...

* Until 600 PM CDT.

* At 539 PM CDT, a severe thunderstorm was located 12 miles southwest
  of Johnstown, or 18 miles southwest of Ainsworth, moving southeast
  at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Moon Lake, Willow Lake State Wildlife Management Area and Long Lake
  State Wildlife Management Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4244 10033 4249 10019 4227 9991 4219 10022
TIME...MOT...LOC 2239Z 327DEG 26KT 4242 10018 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Sporer

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 3:11 PM CDT	Fire Weather Watch	LBF	Chase, Hayes, Lincoln, Perkins	12 hr
Aug 5, 4:02 PM CDT	Special Weather Statement	LBF	Keya Paha	28 min
Aug 5, 4:11 PM CDT	Special Weather Statement	LBF	Sherman	49 min
Aug 5, 4:23 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha	52 min
Aug 5, 5:13 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha, Rock	47 min
Aug 5, 5:49 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LBF	Holt, Rock	41 min
Aug 5, 5:59 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LBF	Blaine, Brown, Cherry, Thomas	46 min
Aug 5, 6:34 PM CDT	Special Weather Statement	LBF	Sheridan	41 min
Aug 5, 6:45 PM CDT	Special Weather Statement	LBF	Blaine	45 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Every severe thunderstorm warning in 2021

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; radar from the NEXRAD Level II archive.