Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 29, NWS Cheyenne, WY

August 15, 2017Banner County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Aug 15, 2017, 4:55 PM MDT for Banner County, Nebraska. It was in force for 45 min. 4 reports 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 15, 2017, 4:55 PM MDT (22:55 UTC)
Expired: Aug 15, 2017, 5:40 PM MDT
In force: 45 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

County Banner County, NE

The radar

The Cheyenne radar (KCYS), 94 km from the middle of the area, began a volume at 22:58 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 15, 5:18 PM MDT	TSTM WND GST 58	14 N Kimball, NE	ESTIMATED GUSTS 55-60 MPH.
Aug 15, 5:18 PM MDT	HAIL 1	14 N Kimball, NE
Aug 15, 5:23 PM MDT	HAIL 2.75	7 Se Harrisburg, NE
Aug 15, 5:42 PM MDT	HAIL 1	5 Se Harrisburg, NE	NICKEL TO QUARTER SIZE HAIL ACCUMULATED 3-4 INCHES DEEP ON HIGHWAY 71.

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 15, 4:03 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.9 hours before the alert went out and 189 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1859 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

368 
WFUS55 KCYS 152255
TORCYS
NEC007-160000-
/O.NEW.KCYS.TO.W.0029.170815T2255Z-170816T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
455 PM MDT TUE AUG 15 2017

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Central Banner County in the Panhandle of Nebraska...

* Until 600 PM MDT

* At 455 PM MDT, a confirmed tornado was located just east of 
  Harrisburg, or 22 miles south of Scottsbluff, moving southeast at 
  15 mph.

  HAZARD...Damaging tornado and quarter size hail. 

  SOURCE...Weather spotters 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. 

* This tornadic thunderstorm will remain over mainly rural areas of
  central Banner County.

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 4144 10403 4166 10386 4166 10348 4140 10353
TIME...MOT...LOC 2255Z 292DEG 12KT 4155 10374 

TORNADO...OBSERVED
HAIL...1.00IN

$$

Rubin

4 follow-up statements

140 
WWUS55 KCYS 152305
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
505 PM MDT TUE AUG 15 2017

NEC007-160000-
/O.CON.KCYS.TO.W.0029.000000T0000Z-170816T0000Z/
Banner NE-
505 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
SOUTHEASTERN BANNER COUNTY...
    
At 504 PM MDT, a confirmed tornado was located just east of 
Harrisburg, or 20 miles north of Kimball, moving southeast at 15 mph.

HAZARD...Damaging tornado and half dollar size hail. 

SOURCE...Weather spotters 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. 

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

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.

&&

LAT...LON 4143 10384 4159 10370 4161 10349 4140 10353
TIME...MOT...LOC 2304Z 301DEG 12KT 4152 10371 

TORNADO...OBSERVED
HAIL...1.25IN

$$

Rubin

330 
WWUS55 KCYS 152316
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
516 PM MDT TUE AUG 15 2017

NEC007-160000-
/O.CON.KCYS.TO.W.0029.000000T0000Z-170816T0000Z/
Banner NE-
516 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
SOUTHEASTERN BANNER COUNTY...
    
At 516 PM MDT, a severe thunderstorm capable of producing a tornado 
was located 5 miles southeast of Harrisburg, or 19 miles north of 
Kimball, moving east at 10 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 Banner County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

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.

&&

LAT...LON 4143 10380 4157 10367 4157 10350 4140 10353
TIME...MOT...LOC 2316Z 290DEG 10KT 4151 10367 

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

$$

Rubin

506 
WWUS55 KCYS 152327
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
527 PM MDT TUE AUG 15 2017

NEC007-160000-
/O.CON.KCYS.TO.W.0029.000000T0000Z-170816T0000Z/
Banner NE-
527 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
SOUTHEASTERN BANNER COUNTY...
    
At 526 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles southeast of Harrisburg, or 18 miles north of
Kimball, moving east at 15 mph.

HAZARD...Tornado and baseball size hail. At 523 pm MDT, baseball 
         size hail was reported 7 miles southeast of Harrisburg.

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 Banner County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

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.

&&

LAT...LON 4142 10375 4155 10362 4154 10351 4140 10353
TIME...MOT...LOC 2326Z 289DEG 14KT 4149 10360 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Rubin

829 
WWUS55 KCYS 152340
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
540 PM MDT TUE AUG 15 2017

NEC007-152349-
/O.CAN.KCYS.TO.W.0029.000000T0000Z-170816T0000Z/
Banner NE-
540 PM MDT TUE AUG 15 2017

...THE TORNADO WARNING FOR SOUTHEASTERN BANNER COUNTY IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and 
a Severe Thunderstorm Warning remains in effect for southeastern 
Banner county until 645 pm MDT, 

A severe thunderstorm watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.

Remember, a Severe Thunderstorm Warning still remains in effect for
much of the Nebraska panhandle until 1100 pm MDT.

LAT...LON 4142 10375 4155 10362 4154 10351 4140 10353
TIME...MOT...LOC 2334Z 292DEG 12KT 4147 10355 

$$

Rubin

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 14, 6:23 PM MDT	Special Weather Statement	CYS	Morrill	52 min
Aug 14, 6:42 PM MDT	Special Weather Statement	CYS	Kimball	33 min
Aug 15, 3:49 PM MDT	Special Weather Statement	CYS	Banner	41 min
Aug 15, 3:58 PM MDT	Severe Thunderstorm Warning	CYS	Banner	62 min
Aug 15, 5:04 PM MDT	Areal Flood Advisory	CYS	Banner	3 hr
Aug 15, 5:22 PM MDT	Special Weather Statement	CYS	Kimball	38 min
Aug 15, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	33 min
Aug 15, 5:30 PM MDT	Special Weather Statement	CYS	Box Butte	45 min
Aug 15, 5:38 PM MDT	Severe Thunderstorm Warning	CYS	Banner	36 min
Aug 15, 5:40 PM MDT	Special Weather Statement	CYS	Dawes	50 min
Aug 15, 5:40 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	50 min
Aug 15, 5:44 PM MDT	Tornado Warning	CYS	Banner, Cheyenne, Kimball	46 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.