Alert archive / Nebraska / Tornado Warnings in 2020

Tornado Warning 16, NWS North Platte, NE

July 20, 2020Hayes County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 20, 2020, 8:08 PM CDT for Hayes County, Nebraska. It was in force for 16 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: Jul 20, 2020, 8:08 PM CDT (01:08 UTC)
Expired: Jul 20, 2020, 8:24 PM CDT
In force: 16 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Hayes County, NE

The radar

The Goodland radar (KGLD), 130 km from the middle of the area, began a volume at 01:08 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
Jul 20, 8:10 PM CDT	HAIL 1	9 Nnw Culbertson, NE	HAIL WAS QUARTER SIZE TO HALF AN INCH IN SIZE. WIND GUSTS OF 40-50 MPH. HAIL LASTED 10-15 MINUTES.

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
Jul 20, 4:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.1 hours before the alert went out and 200 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: 218 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 3375 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

751 
WFUS53 KLBF 210108
TORLBF
NEC085-210200-
/O.NEW.KLBF.TO.W.0016.200721T0108Z-200721T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service North Platte NE
808 PM CDT Mon Jul 20 2020

The National Weather Service in North Platte has issued a

* Tornado Warning for...
  Southeastern Hayes County in southwestern Nebraska...

* Until 900 PM CDT.
    
* At 808 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles southeast of Hayes Center, moving south at 30
  mph.

  HAZARD...Tornado and golf ball size hail.

  SOURCE...Radar indicated rotation.

  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 tornadic thunderstorm will remain over mainly rural areas of
  southeastern Hayes County.

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 4043 10107 4048 10085 4035 10078 4035 10105
      4036 10105
TIME...MOT...LOC 0108Z 342DEG 27KT 4041 10096 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Taylor

1 follow-up statement

673 
WWUS53 KLBF 210124
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
824 PM CDT Mon Jul 20 2020

NEC085-210134-
/O.CAN.KLBF.TO.W.0016.000000T0000Z-200721T0200Z/
Hayes NE-
824 PM CDT Mon Jul 20 2020

...THE TORNADO WARNING FOR SOUTHEASTERN HAYES COUNTY IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

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

LAT...LON 4043 10107 4048 10085 4035 10078 4035 10105
      4036 10105
TIME...MOT...LOC 0124Z 342DEG 27KT 4029 10091 

$$

Taylor

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:12 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	48 min
Jul 20, 7:19 PM CDT	Special Weather Statement	LBF	Sheridan	41 min
Jul 20, 7:29 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Frontier, Hayes, Lincoln, Perkins	46 min
Jul 20, 7:32 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	28 min
Jul 20, 7:48 PM CDT	Tornado Warning	LBF	Hayes	27 min
Jul 20, 7:59 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	46 min
Jul 20, 8:23 PM CDT	Special Weather Statement	LBF	Frontier	37 min
Jul 20, 8:45 PM CDT	Special Weather Statement	LBF	Garden, Grant, Hooker	75 min
Jul 20, 8:58 PM CDT	Severe Thunderstorm Warning	LBF	Garden, Grant, Sheridan	47 min
Jul 20, 9:34 PM CDT	Special Weather Statement	LBF	Blaine, Hooker, Logan, Thomas	56 min
Jul 20, 10:24 PM CDT	Special Weather Statement	LBF	Blaine, Logan	51 min
Jul 20, 11:09 PM CDT	Special Weather Statement	LBF	Blaine, Garfield, Loup	51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.