Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 117, NWS North Platte, NE

August 14, 2021Keith County, Lincoln County, McPherson County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 14, 2021, 5:56 AM MDT for Keith County, Lincoln County, McPherson County, Nebraska. It was in force for 49 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 14, 2021, 5:56 AM MDT (11:56 UTC)
Expired: Aug 14, 2021, 6:45 AM MDT
In force: 49 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Keith County, NE, Lincoln County, NE, McPherson County, NE

The radar

The North Platte radar (KLNX), 95 km from the middle of the area, began a volume at 11:59 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 11.9 hours before the alert went out and 64 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: 446 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1681 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

558 
WUUS53 KLBF 141156
SVRLBF
NEC101-111-117-141245-
/O.NEW.KLBF.SV.W.0117.210814T1156Z-210814T1245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
656 AM CDT Sat Aug 14 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northeastern Keith County in southwestern Nebraska...
  Northwestern Lincoln County in southwestern Nebraska...
  Southwestern McPherson County in west central Nebraska...

* Until 745 AM CDT/645 AM MDT/.

* At 656 AM CDT/556 AM MDT/, a severe thunderstorm was located 9
  miles northeast of Keystone, or 18 miles northeast of Ogallala,
  moving east at 20 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Big Bald Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4120 10144 4133 10151 4152 10119 4128 10104
TIME...MOT...LOC 1156Z 253DEG 18KT 4132 10147 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

CDC

2 follow-up statements

842 
WWUS53 KLBF 141226
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
726 AM CDT Sat Aug 14 2021

NEC101-141236-
/O.CAN.KLBF.SV.W.0117.000000T0000Z-210814T1245Z/
Keith NE-
726 AM CDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KEITH COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4124 10126 4147 10128 4152 10119 4128 10104
TIME...MOT...LOC 1226Z 254DEG 18KT 4135 10125 

$$

NEC111-117-141245-
/O.CON.KLBF.SV.W.0117.000000T0000Z-210814T1245Z/
Lincoln NE-McPherson NE-
726 AM CDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHWESTERN LINCOLN AND SOUTHWESTERN MCPHERSON COUNTIES...

At 726 AM CDT, a severe thunderstorm was located 13 miles north of
Sarben, or 21 miles southwest of Tryon, moving east at 20 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of
northwestern Lincoln and southwestern McPherson Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4124 10126 4147 10128 4152 10119 4128 10104
TIME...MOT...LOC 1226Z 254DEG 18KT 4135 10125 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

CDC

565 
WWUS53 KLBF 141243 RRA
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
743 AM CDT Sat Aug 14 2021

NEC111-117-141253-
/O.EXP.KLBF.SV.W.0117.000000T0000Z-210814T1245Z/
Lincoln NE-McPherson NE-
743 AM CDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LINCOLN AND
SOUTHWESTERN MCPHERSON COUNTIES WILL EXPIRE AT 745 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 4124 10126 4147 10128 4152 10119 4128 10104
TIME...MOT...LOC 1243Z 253DEG 18KT 4137 10115 

$$

CDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 5:09 AM MDT	Special Weather Statement	LBF	Keith	51 min
Aug 14, 5:18 AM MDT	Severe Thunderstorm Warning	LBF	Keith	42 min
Aug 14, 5:43 AM MDT	Severe Thunderstorm Warning	LBF	Keith	47 min
Aug 14, 5:51 AM MDT	Severe Thunderstorm Warning	LBF	Keith	19 min
Aug 14, 6:23 AM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	37 min
Aug 14, 6:44 AM MDT	Special Weather Statement	LBF	McPherson	46 min
Aug 14, 6:59 AM MDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Chase, Perkins	46 min
Aug 14, 7:35 AM MDT	Special Weather Statement	LBF	Keith	40 min
Aug 14, 7:44 AM MDT	Severe Thunderstorm Warning	LBF	Chase, Hayes, Perkins	31 min
Aug 14, 8:14 AM MDT	Severe Thunderstorm Warning	LBF	Chase, Hayes, Lincoln, Perkins	46 min
Aug 14, 8:33 AM MDT	Special Weather Statement	LBF	Perkins	42 min
Aug 14, 8:49 AM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	41 min
Aug 14, 8:59 AM MDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Chase, Hayes, Perkins	26 min
Aug 14, 9:28 AM MDT	Severe Thunderstorm Warning	LBF	Perkins	47 min
Aug 14, 10:02 AM MDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Chase, Hayes, Lincoln, Perkins	43 min
Aug 14, 10:44 AM MDT	Special Weather Statement	LBF	Hayes	46 min
Aug 14, 11:39 AM MDT	Special Weather Statement	LBF	Lincoln	51 min
Aug 14, 12:29 PM MDT	Special Weather Statement	LBF	Lincoln	46 min
Aug 14, 4:16 PM MDT	Special Weather Statement	LBF	Dawes	59 min
Aug 14, 4:21 PM MDT	Special Weather Statement	LBF	Sheridan	39 min
Aug 14, 4:26 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	49 min
Aug 14, 4:28 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	47 min
Aug 14, 4:56 PM MDT	Special Weather Statement	LBF	Sheridan	49 min
Aug 14, 5:01 PM MDT	Special Weather Statement	LBF	Sheridan	44 min
Aug 14, 5:06 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	39 min
Aug 14, 5:44 PM MDT	Special Weather Statement	LBF	Sheridan	46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.