Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 18, NWS North Platte, NE

August 19, 2017Custer County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 19, 2017, 9:01 PM CDT for Custer County, Nebraska. It was in force for 29 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 19, 2017, 9:01 PM CDT (02:01 UTC)
Expired: Aug 19, 2017, 9:30 PM CDT
In force: 29 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Tornado: Observed
Hail: 2.0 in

County Custer County, NE

The radar

The North Platte radar (KLNX), 98 km from the middle of the area, began a volume at 02:00 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 19, 9:07 PM CDT	TSTM WND GST 85	Nw Sargent, NE

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
Aug 19, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.0 hours before the alert went out and 112 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: 2449 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 2367 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

As transmitted.

280 
WFUS53 KLBF 200201
TORLBF
NEC041-200230-
/O.NEW.KLBF.TO.W.0018.170820T0201Z-170820T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service North Platte NE
901 PM CDT SAT AUG 19 2017

The National Weather Service in North Platte has issued a

* Tornado Warning for...
  Northeastern Custer County in central Nebraska...

* Until 930 PM CDT

* At 901 PM CDT, a confirmed tornado was located 7 miles northwest 
  of Sargent, or 7 miles southwest of Taylor, moving south at 10 mph.

  HAZARD...Damaging tornado and hail up to two inches in diameter. 

  SOURCE...Law enforcement confirmed tornado. 

  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. 

* The tornado will be near...
  Sargent around 920 PM CDT. 

This includes Highway 183 between mile markers 114 and 115.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4169 9952 4172 9942 4163 9935 4160 9951
TIME...MOT...LOC 0201Z 356DEG 9KT 4169 9946 

TORNADO...OBSERVED
HAIL...2.00IN

$$

Roberg

2 follow-up statements

114 
WWUS53 KLBF 200221
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
921 PM CDT SAT AUG 19 2017

NEC041-200230-
/O.CON.KLBF.TO.W.0018.000000T0000Z-170820T0230Z/
Custer NE-
921 PM CDT SAT AUG 19 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
NORTHEASTERN CUSTER COUNTY...
    
At 920 PM CDT, a severe thunderstorm capable of producing a tornado 
was located 5 miles west of Sargent, or 9 miles southwest of Taylor, 
moving south at 10 mph.

HAZARD...Tornado and two inch 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
northeastern Custer County.

This includes Highway 183 between mile markers 114 and 115.
 
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 4169 9952 4172 9942 4163 9935 4160 9951
TIME...MOT...LOC 0220Z 356DEG 9KT 4165 9946 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

Roberg

153 
WWUS53 KLBF 200230
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
930 PM CDT SAT AUG 19 2017

NEC041-200238-
/O.EXP.KLBF.TO.W.0018.000000T0000Z-170820T0230Z/
Custer NE-
930 PM CDT SAT AUG 19 2017

...THE TORNADO WARNING FOR NORTHEASTERN CUSTER COUNTY WILL EXPIRE AT
930 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.  However hail, 
gusty winds and heavy rain are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 100 AM CDT for
central Nebraska.

Remember, a Severe Thunderstorm Warning still remains in effect for
northeastern Custer County until 945 pm cdt.

LAT...LON 4169 9952 4172 9942 4163 9935 4160 9951
TIME...MOT...LOC 0228Z 356DEG 9KT 4163 9946 

$$

Roberg

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 7:14 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Loup, Rock	46 min
Aug 19, 7:39 PM CDT	Tornado Warning	LBF	Loup	51 min
Aug 19, 7:54 PM CDT	Flash Flood Warning	LBF	Blaine, Loup, Rock	6 hr
Aug 19, 8:02 PM CDT	Tornado Warning	LBF	Loup	43 min
Aug 19, 8:44 PM CDT	Severe Thunderstorm Warning	LBF	Custer	61 min
Aug 19, 8:48 PM CDT	Severe Thunderstorm Warning	LBF	Loup	27 min
Aug 19, 9:20 PM CDT	Flash Flood Warning	LBF	Custer, Loup	6 hr
Aug 19, 9:45 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
Aug 19, 10:20 PM CDT	Special Weather Statement	LBF	Loup	40 min
Aug 19, 10:40 PM CDT	Special Weather Statement	LBF	Custer	50 min

Nearby

Tornado Warnings in Nebraska, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.