Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 143, NWS North Platte, NE

August 19, 20214 counties in Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 19, 2021, 8:17 PM MDT for 4 counties in Nebraska. It was in force for 43 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 19, 2021, 8:17 PM MDT (02:17 UTC)
Expired: Aug 19, 2021, 9:00 PM MDT
In force: 43 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Chase County, NE, Hayes County, NE, Lincoln County, NE, Perkins County, NE

The radar

The Goodland radar (KGLD), 146 km from the middle of the area, began a volume at 02:21 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 19, 8:19 PM MDT	TSTM WND GST 71	1 Ese Imperial, NE	IMPERIAL AWOS.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 19, 5:25 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.3 hours before the alert went out and 90 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: 1368 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 10.2

Open this sounding in Storm Lab

The text

As transmitted.

789 
WUUS53 KLBF 200217
SVRLBF
NEC029-085-111-135-200300-
/O.NEW.KLBF.SV.W.0143.210820T0217Z-210820T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
917 PM CDT Thu Aug 19 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Eastern Perkins County in southwestern Nebraska...
  Chase County in southwestern Nebraska...
  Southwestern Lincoln County in southwestern Nebraska...
  Northwestern Hayes County in southwestern Nebraska...

* Until 1000 PM CDT/900 PM MDT/.

* At 916 PM CDT/816 PM MDT/, severe thunderstorms were located along
  a line extending from near Elsie to 6 miles north of Imperial to 8
  miles southwest of Champion, moving southeast at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Imperial, Wauneta, Wallace, Elsie, Enders, Enders Reservoir State
  Recreation Area, Champion, Crete, Grainton, Center Dam Campground,
  Wanamaker State Wildfire Management Area, Area A Campground and
  Church Grove Campground.

This includes Highway 61 between mile markers 25 and 53.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT/1100 PM MDT/ for
southwestern Nebraska.

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

A Tornado Watch remains in effect until midnight CDT/1100 PM MDT/ for
southwestern Nebraska.

&&

LAT...LON 4035 10192 4040 10197 4065 10166 4101 10140
      4101 10126 4102 10125 4103 10107 4056 10112
      4035 10134
TIME...MOT...LOC 0216Z 317DEG 30KT 4090 10139 4061 10160 4041 10185 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Taylor

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 6:02 PM MDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Chase, Perkins	43 min
Aug 19, 6:13 PM MDT	Flash Flood Warning	LBF	Keith	3 hr
Aug 19, 6:32 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	43 min
Aug 19, 6:42 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	48 min
Aug 19, 6:50 PM MDT	Areal Flood Advisory	LBF	Arthur	2 hr
Aug 19, 6:59 PM MDT	Areal Flood Advisory	LBF	Chase, Perkins	2 hr
Aug 19, 7:13 PM MDT	Areal Flood Warning	LBF	Chase, Perkins	24 hr
Aug 19, 7:39 PM MDT	Areal Flood Advisory	LBF	Keith, Lincoln, Perkins	3 hr
Aug 19, 7:42 PM MDT	Special Weather Statement	LBF	Perkins	48 min
Aug 19, 8:14 PM MDT	Special Weather Statement	LBF	Chase	46 min
Aug 19, 8:28 PM MDT	Special Weather Statement	LBF	Lincoln	47 min
Aug 19, 8:40 PM MDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Chase, Frontier, Hayes, Lincoln, Perkins	50 min
Aug 19, 8:51 PM MDT	Areal Flood Advisory	LBF	Custer, Keith, Lincoln	4 hr
Aug 19, 8:56 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	49 min
Aug 19, 9:34 PM MDT	Special Weather Statement	LBF	Frontier, Hayes	41 min
Aug 19, 9:41 PM MDT	Special Weather Statement	LBF	Dawson	49 min
Aug 19, 10:22 PM MDT	Special Weather Statement	LBF	Custer	38 min
Aug 19, 10:28 PM MDT	Special Weather Statement	LBF	Frontier	47 min
Aug 19, 10:32 PM MDT	Special Weather Statement	LBF	Chase	43 min
Aug 19, 11:15 PM MDT	Special Weather Statement	LBF	Chase	45 min
Aug 19, 11:58 PM MDT	Special Weather Statement	LBF	Hayes	47 min
Aug 20, 12:39 AM MDT	Areal Flood Warning	LBF	Chase, Hayes	19 hr
Aug 20, 12:50 AM MDT	Areal Flood Advisory	LBF	Lincoln	2 hr
Aug 20, 12:56 AM MDT	Special Weather Statement	LBF	Lincoln	49 min
Aug 20, 2:12 AM MDT	Special Weather Statement	LBF	Custer	48 min
Aug 20, 9:35 AM MDT	River Flood Advisory	LBF	Hayes	10 hr
Aug 20, 1:40 PM MDT	River Flood Advisory	LBF	Lincoln	24 hr

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.