Alert archive / Nebraska / Tornado Warnings in 2020

Tornado Warning 15, NWS North Platte, NE

July 20, 2020Hayes County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 20, 2020, 7:48 PM CDT for Hayes County, Nebraska. It was in force for 27 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, 7:48 PM CDT (00:48 UTC)
Expired: Jul 20, 2020, 8:15 PM CDT
In force: 27 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), 142 km from the middle of the area, began a volume at 00:47 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, 8:00 PM CDT	HAIL 1.75	Hayes Center, NE	DELAYED REPORT VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.

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, 0.8 hours before the alert went out and 204 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.

605 
WFUS53 KLBF 210048
TORLBF
NEC085-210115-
/O.NEW.KLBF.TO.W.0015.200721T0048Z-200721T0115Z/

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

The National Weather Service in North Platte has issued a

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

* Until 815 PM CDT.
    
* At 748 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Hayes Center, moving south at 35 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 dangerous storm will be near...
  Hayes Center around 755 PM CDT.

Other locations impacted by this tornadic thunderstorm include Hayes
Center State Wildlife Management Area.

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 4061 10107 4065 10094 4038 10080 4038 10106
TIME...MOT...LOC 0048Z 341DEG 29KT 4058 10100 

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

$$

Taylor

1 follow-up statement

751 
WWUS53 KLBF 210059
SVSLBF

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

NEC085-210115-
/O.CON.KLBF.TO.W.0015.000000T0000Z-200721T0115Z/
Hayes NE-
759 PM CDT Mon Jul 20 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR EASTERN
HAYES COUNTY...
    
At 758 PM CDT, a severe thunderstorm capable of producing a tornado
was located over 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
eastern Hayes County, including the following locations... Hayes
Center State Wildlife Management Area.

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 4061 10107 4065 10094 4038 10080 4038 10106
TIME...MOT...LOC 0058Z 342DEG 28KT 4051 10099 

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

$$

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, 7:59 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	46 min
Jul 20, 8:08 PM CDT	Tornado Warning	LBF	Hayes	16 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.