Alert archive / Nebraska / Tornado Warnings in 2020

Tornado Warning 17, NWS North Platte, NE

August 30, 2020Brown County, Rock County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 30, 2020, 6:21 PM CDT for Brown County, Rock County, Nebraska. It was in force for 39 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 30, 2020, 6:21 PM CDT (23:21 UTC)
Expired: Aug 30, 2020, 7:00 PM CDT
In force: 39 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Brown County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 99 km from the middle of the area, began a volume at 23:24 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 30, 5:46 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.4 hours before the alert went out and 175 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: 772 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

063 
WFUS53 KLBF 302321
TORLBF
NEC017-149-310000-
/O.NEW.KLBF.TO.W.0017.200830T2321Z-200831T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service North Platte NE
621 PM CDT Sun Aug 30 2020

The National Weather Service in North Platte has issued a

* Tornado Warning for...
  West central Rock County in north central Nebraska...
  Northeastern Brown County in north central Nebraska...

* Until 700 PM CDT.

* At 621 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Long Pine, or near Ainsworth, moving southeast at
  15 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Weather spotters reported funnel cloud.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Long Pine around 630 PM CDT.
  Bassett around 650 PM CDT.

This includes the following highways...
 Highway 183 between mile markers 175 and 195.
 Highway 20 between mile markers 248 and 262.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4254 9977 4261 9973 4258 9948 4241 9957
TIME...MOT...LOC 2321Z 295DEG 15KT 4256 9972 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Kulik

1 follow-up statement

585 
WWUS53 KLBF 302353
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
653 PM CDT Sun Aug 30 2020

NEC017-149-310002-
/O.EXP.KLBF.TO.W.0017.000000T0000Z-200831T0000Z/
Rock NE-Brown NE-
653 PM CDT Sun Aug 30 2020

...THE TORNADO WARNING FOR WEST CENTRAL ROCK AND NORTHEASTERN BROWN
COUNTIES WILL EXPIRE AT 700 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
north central Nebraska.

LAT...LON 4254 9977 4261 9973 4258 9948 4241 9957
TIME...MOT...LOC 2352Z 295DEG 15KT 4251 9957 

$$

Kulik

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 3:38 AM CDT	Red Flag Warning	LBF	Arthur, Chase, Cherry, Deuel, Garden, Grant and 5 more	17 hr
Aug 30, 5:58 PM CDT	Special Weather Statement	LBF	Keya Paha	47 min
Aug 30, 6:43 PM CDT	Special Weather Statement	LBF	Rock	47 min

Nearby

Tornado Warnings in Nebraska, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.