Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 109, NWS North Platte, NE

August 5, 2021Holt County, Rock County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 5, 2021, 5:49 PM CDT for Holt County, Rock County, Nebraska. It was in force for 41 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, 5:49 PM CDT (22:49 UTC)
Expired: Aug 5, 2021, 6:30 PM CDT
In force: 41 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Damage threat: Destructive
Hail: 3.0 in
Wind: 70.0 mph

Counties Holt County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 135 km from the middle of the area, began a volume at 22:49 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, 6:03 PM CDT	HAIL 1	1 Sw Stuart, 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, 10.8 hours before the alert went out and 198 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.

115 
WUUS53 KLBF 052249
SVRLBF
NEC089-149-052330-
/O.NEW.KLBF.SV.W.0109.210805T2249Z-210805T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
549 PM CDT Thu Aug 5 2021

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northeastern Rock County in north central Nebraska...
  Southwestern Holt County in north central Nebraska...

* Until 630 PM CDT.

* At 548 PM CDT, a severe thunderstorm was located near Newport, or
  15 miles east of Bassett, moving southeast at 40 mph.

  THIS IS A DESTRUCTIVE STORM APPROACHING STUART!

  HAZARD...Three inch hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  O'neill, O'Neill, Atkinson, Stuart, Newport and Emmet. 

This includes the following highways...
 Highway 20 between mile markers 265 and 308.
 Highway 281 between mile markers 183 and 189.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

&&

LAT...LON 4256 9946 4274 9928 4252 9857 4224 9884
TIME...MOT...LOC 2248Z 300DEG 33KT 4262 9924 

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...3.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Sporer

2 follow-up statements

589 
WWUS53 KLBF 052309
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
609 PM CDT Thu Aug 5 2021

NEC149-052319-
/O.CAN.KLBF.SV.W.0109.000000T0000Z-210805T2330Z/
Rock NE-
609 PM CDT Thu Aug 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROCK 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 4243 9920 4267 9908 4252 9857 4224 9884
TIME...MOT...LOC 2309Z 300DEG 33KT 4252 9901 

$$

NEC089-052330-
/O.CON.KLBF.SV.W.0109.000000T0000Z-210805T2330Z/
Holt NE-
609 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN HOLT COUNTY...

At 609 PM CDT, a severe thunderstorm was located over Atkinson, or 19
miles west of O'Neill, moving southeast at 40 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
O'neill, O'Neill, Atkinson and Emmet. 

This includes the following highways...
 Highway 20 between mile markers 281 and 308.
 Highway 281 between mile markers 183 and 189.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4243 9920 4267 9908 4252 9857 4224 9884
TIME...MOT...LOC 2309Z 300DEG 33KT 4252 9901 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...${observedHail}
MAX HAIL SIZE...1.50 IN
WIND THREAT...${observedWind}
MAX WIND GUST...70 MPH

$$

Sporer

571 
WWUS53 KLBF 052324
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
624 PM CDT Thu Aug 5 2021

NEC089-052333-
/O.EXP.KLBF.SV.W.0109.000000T0000Z-210805T2330Z/
Holt NE-
624 PM CDT Thu Aug 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HOLT COUNTY WILL
EXPIRE AT 630 PM 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.

LAT...LON 4243 9920 4267 9908 4252 9857 4224 9884
TIME...MOT...LOC 2323Z 300DEG 33KT 4246 9887 

$$

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, 5:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Brown, Cherry	21 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.