Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 11, NWS North Platte, NE

August 7, 2017Chase County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 7, 2017, 4:42 PM MDT for Chase County, Nebraska. It was in force for 48 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 7, 2017, 4:42 PM MDT (22:42 UTC)
Expired: Aug 7, 2017, 5:30 PM MDT
In force: 48 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Tornado: Observed
Hail: 0.0 in

County Chase County, NE

The radar

The Goodland radar (KGLD), 118 km from the middle of the area, began a volume at 22:44 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.7 hours before the alert went out and 127 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: 39 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 707 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

802 
WFUS53 KLBF 072242
TORLBF
NEC029-072330-
/O.NEW.KLBF.TO.W.0011.170807T2242Z-170807T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service North Platte NE
442 PM MDT MON AUG 7 2017

The National Weather Service in North Platte has issued a

* Tornado Warning for...
  Southwestern Chase County in southwestern Nebraska...

* Until 530 PM MDT

* At 440 PM MDT, a confirmed landspout tornado was located near 
  Champion, or 8 miles southwest of Imperial, moving southeast at 15 
  mph.

  HAZARD...Tornado. 

  SOURCE...Weather spotters confirmed landspout tornado. 

  IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

* This tornadic thunderstorm will remain over mainly rural areas of
  southwestern Chase County, including the following locations:
  Crete.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
North Platte.

Landspout tornadoes are typically very weak and do not stay on the 
ground for long periods of time. None the less, they can produce 
damage, and persons in the path of this storm should seek shelter 
immediatley in a basement or interior room on the lowest level and 
stay away from windows. 

&&

LAT...LON 4045 10191 4053 10169 4035 10155 4035 10186
TIME...MOT...LOC 2240Z 334DEG 12KT 4043 10176 

TORNADO...OBSERVED
HAIL...0.00IN

$$

Buttler

2 follow-up statements

217 
WWUS53 KLBF 072310
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
510 PM MDT MON AUG 7 2017

NEC029-072330-
/O.CON.KLBF.TO.W.0011.000000T0000Z-170807T2330Z/
Chase NE-
510 PM MDT MON AUG 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR SOUTH
CENTRAL CHASE COUNTY...

At 508 PM MDT, doppler radar indicated a thunderstorm capable or 
producing a landspout tornado located near Champion, or 10 miles 
southwest of Imperial, moving southeast at 10 mph.

HAZARD...TORNADO. 

SOURCE...Radar indicated rotation. 

IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

Locations impacted include...
Champion and Crete. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

Landspout tornadoes are typically weak and do not stay on the ground 
for long periods of time. None the less, they can produce damage, 
and persons in the path of this storm should seek shelter 
immediatley in a basement or interior room on the lowest level and 
stay away from windows. 

&&

LAT...LON 4044 10189 4052 10168 4035 10155 4035 10184
TIME...MOT...LOC 2308Z 315DEG 10KT 4043 10181 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Buttler

156 
WWUS53 KLBF 072328
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
528 PM MDT MON AUG 7 2017

NEC029-072337-
/O.EXP.KLBF.TO.W.0011.000000T0000Z-170807T2330Z/
Chase NE-
528 PM MDT MON AUG 7 2017

...THE TORNADO WARNING FOR SOUTH CENTRAL CHASE COUNTY WILL EXPIRE AT
530 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
North Platte.

LAT...LON 4044 10189 4052 10168 4035 10155 4035 10184
TIME...MOT...LOC 2327Z 334DEG 12KT 4038 10177 

$$

Buttler

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 11:35 PM MDT	Special Weather Statement	LBF	Lincoln	55 min
Aug 7, 12:03 AM MDT	Special Weather Statement	LBF	Hayes	42 min
Aug 7, 12:44 AM MDT	Special Weather Statement	LBF	Hayes	46 min
Aug 7, 2:36 AM MDT	Dense Fog Advisory	LBF	Blaine, Boyd, Brown, Cherry, Grant, Holt and 4 more	6 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.