Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 107, NWS North Platte, NE

August 5, 20214 counties in Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 5, 2021, 5:13 PM CDT for 4 counties in Nebraska. It was in force for 47 min. 3 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: Aug 5, 2021, 5:13 PM CDT (22:13 UTC)
Expired: Aug 5, 2021, 6:00 PM CDT
In force: 47 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Brown County, NE, Cherry County, NE, Keya Paha County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 108 km from the middle of the area, began a volume at 22:17 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, 5:14 PM CDT	TSTM WND DMG	8 Ssw Burton, NE	ROUGHLY HALF MILE OF POWER POLES SNAPPED. TIME ESTIMATED.
Aug 5, 5:15 PM CDT	TSTM WND GST 80	9 S Burton, NE	WIND GUSTS ESTIMATED AT 80 MPH. SEVERAL TREES UPROOTED AND BROKEN OFF. A CAMPER WAS ROLLED OVER AND A GRAIN BIN WAS DAMAGED. POWER WAS ALSO LOST.
Aug 5, 5:15 PM CDT	HAIL 1.75	9 S Burton, NE	VERY HEAVY RAIN WITH HAIL UP TO GOLF BALL SIZE WAS OBSERVED.

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, 10.2 hours before the alert went out and 184 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.

842 
WUUS53 KLBF 052213
SVRLBF
NEC017-031-103-149-052300-
/O.NEW.KLBF.SV.W.0107.210805T2213Z-210805T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
513 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...
  Northern Rock County in north central Nebraska...
  Central Brown County in north central Nebraska...
  Southeastern Keya Paha County in north central Nebraska...

* Until 600 PM CDT.

* At 513 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles east of Springview to 7 miles west of
  Johnstown, moving southeast at 25 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ainsworth, Bassett, Long Pine, Newport, Johnstown, Wood Lake,
  Hofeld Lake, Bobcat State Wildlife Management Area, Meadville,
  Keller Park State Recreation Area, Thomas Creek State Wildlife
  Management Area, Pine Glen State Wildlife Refuge, Antelope Peak and
  Jones Lake.

This includes the following highways...
 Highway 183 between mile markers 171 and 212.
 Highway 20 between mile markers 221 and 274.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4270 9924 4250 9925 4227 9993 4261 10036
      4286 9959
TIME...MOT...LOC 2213Z 309DEG 23KT 4280 9961 4260 10020 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Sporer

2 follow-up statements

131 
WWUS53 KLBF 052227
SVSLBF

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

NEC031-052233-
/O.CAN.KLBF.SV.W.0107.000000T0000Z-210805T2300Z/
Cherry NE-
527 PM CDT Thu Aug 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHERRY COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4270 9924 4250 9925 4227 9993 4247 10019
      4261 10018 4281 9949
TIME...MOT...LOC 2223Z 309DEG 23KT 4277 9956 4257 10015 

$$

NEC017-103-149-052300-
/O.CON.KLBF.SV.W.0107.000000T0000Z-210805T2300Z/
Rock NE-Brown NE-Keya Paha NE-
527 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR NORTHERN ROCK...CENTRAL BROWN AND SOUTHEASTERN KEYA PAHA
COUNTIES...

At 523 PM CDT, severe thunderstorms were located along a line
extending from 10 miles east of Springview to near Johnstown, moving
southeast at 25 mph.

THESE ARE DESTRUCTIVE STORMS FOR LOCATIONS MAINLY BETWEEN NEWPORT 
AND THE NIOBRARA RIVER.

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...
Ainsworth, Bassett, Long Pine, Newport, Johnstown, Hofeld Lake,
Keller Park State Recreation Area, Pine Glen State Wildlife Refuge,
Antelope Peak and Jones Lake.

This includes the following highways...
 Highway 183 between mile markers 171 and 207.
 Highway 20 between mile markers 225 and 274.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4270 9924 4250 9925 4227 9993 4247 10019
      4261 10018 4281 9949
TIME...MOT...LOC 2223Z 309DEG 23KT 4277 9956 4257 10015 

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...${observedHail}
MAX HAIL SIZE...3.00 IN
WIND THREAT...${observedWind}
MAX WIND GUST...70 MPH

$$

Sporer

340 
WWUS53 KLBF 052252
SVSLBF

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

NEC103-149-052301-
/O.CAN.KLBF.SV.W.0107.000000T0000Z-210805T2300Z/
Rock NE-Keya Paha NE-
552 PM CDT Thu Aug 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ROCK AND SOUTHEASTERN
KEYA PAHA COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4227 9993 4247 10019 4252 9996 4233 9977
TIME...MOT...LOC 2251Z 309DEG 23KT 4266 9938 4246 9997 

$$

NEC017-052300-
/O.CON.KLBF.SV.W.0107.000000T0000Z-210805T2300Z/
Brown NE-
552 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR CENTRAL BROWN COUNTY...

At 551 PM CDT, severe thunderstorms were located along a line
extending from near Newport to 8 miles southwest of Ainsworth, moving
southeast at 25 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...
Hofeld Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4227 9993 4247 10019 4252 9996 4233 9977
TIME...MOT...LOC 2251Z 309DEG 23KT 4266 9938 4246 9997 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...${observedHail}
MAX HAIL SIZE...1.00 IN
WIND THREAT...${observedWind}
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, 5:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LBF	Brown, Cherry	21 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.