Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS North Platte, NE

May 15, 2021Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 15, 2021, 7:44 PM MDT for Perkins County, Nebraska. It was in force for 46 min. 2 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: May 15, 2021, 7:44 PM MDT (01:44 UTC)
Expired: May 15, 2021, 8:30 PM MDT
In force: 46 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Perkins County, NE

The radar

The North Platte radar (KLNX), 147 km from the middle of the area, began a volume at 01:47 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
May 15, 7:50 PM MDT	HAIL 1	2 Nnw Grant, NE
May 15, 7:55 PM MDT	HAIL 1.75	5 N Grant, NE	2 MILE WIDE SWATH OF HAIL SOME UP TO GOLFBALL SIZE

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 00:00Z, 1.7 hours before the alert went out and 94 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: 266 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1597 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

260 
WUUS53 KLBF 160144
SVRLBF
NEC135-160230-
/O.NEW.KLBF.SV.W.0015.210516T0144Z-210516T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
744 PM MDT Sat May 15 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northeastern Perkins County in southwestern Nebraska...

* Until 830 PM MDT.

* At 744 PM MDT, a severe thunderstorm was located near Grant, moving
  northeast at 15 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Grant and Wild Horse Spring. 

This includes Highway 61 between mile markers 64 and 79.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 10188 4101 10178 4101 10148 4089 10138
      4081 10177
TIME...MOT...LOC 0144Z 242DEG 11KT 4090 10176 

HAIL...1.50IN
WIND...<50MPH
 
$$

Taylor

1 follow-up statement

433 
WWUS53 KLBF 160203
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
803 PM MDT Sat May 15 2021

NEC135-160230-
/O.CON.KLBF.SV.W.0015.000000T0000Z-210516T0230Z/
Perkins NE-
803 PM MDT Sat May 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN PERKINS COUNTY...

At 802 PM MDT, a severe thunderstorm was located near Grant, moving
east at 15 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...
Grant and Wild Horse Spring. 

This includes Highway 61 between mile markers 64 and 79.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4094 10188 4101 10178 4101 10148 4089 10138
      4081 10177
TIME...MOT...LOC 0202Z 258DEG 11KT 4090 10168 

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

Taylor

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 6:01 PM MDT	Special Weather Statement	LBF	Chase	44 min
May 15, 6:03 PM MDT	Special Weather Statement	LBF	Perkins	42 min
May 15, 6:31 PM MDT	Special Weather Statement	LBF	Lincoln	44 min
May 15, 6:42 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	48 min
May 15, 6:48 PM MDT	Special Weather Statement	LBF	Arthur	42 min
May 15, 7:06 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	39 min
May 15, 7:13 PM MDT	Severe Thunderstorm Warning	LBF	Keith	47 min
May 15, 7:35 PM MDT	Special Weather Statement	LBF	Perkins	40 min
May 15, 8:06 PM MDT	Special Weather Statement	LBF	Lincoln	39 min
May 15, 8:07 PM MDT	Special Weather Statement	LBF	Custer	38 min
May 15, 8:23 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	52 min
May 15, 8:42 PM MDT	Special Weather Statement	LBF	Perkins	48 min
May 15, 9:56 PM MDT	Special Weather Statement	LBF	Perkins	49 min
May 15, 11:08 PM MDT	Special Weather Statement	LBF	Perkins	52 min
May 15, 11:21 PM MDT	Areal Flood Warning	LBF	Lincoln, Perkins	4 hr
May 16, 3:16 AM MDT	Areal Flood Advisory	LBF	Cherry, Grant, Hooker	3 hr
May 16, 3:38 AM MDT	Areal Flood Advisory	LBF	Sheridan	101 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.