Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 30, NWS Cheyenne, WY

August 15, 2017Banner County, Cheyenne County, Kimball County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Aug 15, 2017, 5:44 PM MDT for Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 46 min. 2 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, 5:44 PM MDT (23:44 UTC)
Expired: Aug 15, 2017, 6:30 PM MDT
In force: 46 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Banner County, NE, Cheyenne County, NE, Kimball County, NE

The radar

The Cheyenne radar (KCYS), 117 km from the middle of the area, began a volume at 23:48 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, 5:55 PM MDT	HAIL 1.5	7 N Dix, NE
Aug 15, 6:10 PM MDT	TORNADO	8 N Potter, NE	POSSIBLE RAIN-WRAPPED TORNADO ON THE GROUND.

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, 11.7 hours before the alert went out and 163 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.

450 
WFUS55 KCYS 152344
TORCYS
NEC007-033-105-160030-
/O.NEW.KCYS.TO.W.0030.170815T2344Z-170816T0030Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Northwestern Cheyenne County in the Panhandle of Nebraska...
  Northeastern Kimball County in the Panhandle of Nebraska...
  Southeastern Banner County in the Panhandle of Nebraska...

* Until 630 PM MDT
    
* At 544 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles northeast of Kimball, moving east at 20 mph.

  HAZARD...Tornado and half dollar 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
  northwestern Cheyenne...northeastern Kimball and southeastern
  Banner Counties.

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 4129 10358 4142 10358 4141 10320 4124 10321
TIME...MOT...LOC 2344Z 273DEG 19KT 4134 10360 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Cox

4 follow-up statements

393 
WWUS55 KCYS 152350
SVSCYS

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

NEC007-033-105-160030-
/O.CON.KCYS.TO.W.0030.000000T0000Z-170816T0030Z/
Cheyenne NE-Kimball NE-Banner NE-
550 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
NORTHWESTERN CHEYENNE...NORTHEASTERN KIMBALL AND SOUTHEASTERN BANNER
COUNTIES...
    
At 550 PM MDT, a severe thunderstorm capable of producing a tornado
was located 7 miles northeast of Dix, or 13 miles northeast of
Kimball, moving east at 30 mph.

HAZARD...Tornado and baseball 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
northwestern Cheyenne...northeastern Kimball and southeastern Banner
Counties.

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 4129 10358 4142 10358 4141 10320 4124 10321
TIME...MOT...LOC 2350Z 272DEG 26KT 4133 10343 

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

$$

Cox

375 
WWUS55 KCYS 160003
SVSCYS

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

NEC007-160012-
/O.CAN.KCYS.TO.W.0030.000000T0000Z-170816T0030Z/
Banner NE-
603 PM MDT TUE AUG 15 2017

...THE TORNADO WARNING FOR SOUTHEASTERN BANNER COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4128 10354 4138 10351 4140 10320 4124 10321
TIME...MOT...LOC 0002Z 273DEG 19KT 4133 10334 

$$

NEC033-105-160030-
/O.CON.KCYS.TO.W.0030.000000T0000Z-170816T0030Z/
Cheyenne NE-Kimball NE-
603 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
NORTHWESTERN CHEYENNE AND NORTHEASTERN KIMBALL COUNTIES...
    
At 602 PM MDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of Potter, or 17 miles east of Kimball,
moving east at 20 mph.

HAZARD...Tornado and three 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
northwestern Cheyenne and northeastern Kimball Counties.

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 4128 10354 4138 10351 4140 10320 4124 10321
TIME...MOT...LOC 0002Z 273DEG 19KT 4133 10334 

TORNADO...RADAR INDICATED
HAIL...3.00IN

$$

Cox

027 
WWUS55 KCYS 160015
SVSCYS

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

NEC033-105-160030-
/O.CON.KCYS.TO.W.0030.000000T0000Z-170816T0030Z/
Cheyenne NE-Kimball NE-
615 PM MDT TUE AUG 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
NORTHWESTERN CHEYENNE AND NORTHEASTERN KIMBALL COUNTIES...
    
At 615 PM MDT, a confirmed tornado was located 8 miles northeast of
Potter, or 19 miles northwest of Sidney, moving east at 20 mph.

HAZARD...Damaging tornado and baseball 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
northwestern Cheyenne and northeastern Kimball Counties.

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4128 10348 4138 10348 4140 10320 4124 10321
TIME...MOT...LOC 0015Z 273DEG 19KT 4133 10325 

TORNADO...OBSERVED
HAIL...2.75IN

$$

Cox

939 
WWUS55 KCYS 160024
SVSCYS

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

NEC033-105-160031-
/O.EXP.KCYS.TO.W.0030.000000T0000Z-170816T0030Z/
Cheyenne NE-Kimball NE-
624 PM MDT TUE AUG 15 2017

...THE TORNADO WARNING FOR NORTHWESTERN CHEYENNE AND NORTHEASTERN
KIMBALL COUNTIES WILL EXPIRE AT 630 PM MDT...
    
The Tornado Warning that was previously in effect has been reissued 
for northwest Cheyenne county, and is in effect until 700 pm. Please 
refer to that bulletin for the latest severe weather information. 
However small hail, gusty winds and heavy rain are still possible 
with this thunderstorm.

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


LAT...LON 4128 10348 4138 10348 4140 10320 4124 10321
TIME...MOT...LOC 0021Z 273DEG 19KT 4133 10324 

$$

Cox

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, 4:55 PM MDT	Tornado Warning Tornado observed	CYS	Banner	45 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

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.