Alert archive / Nebraska / Tornado Warnings in 2015

Tornado Warning 3, NWS Cheyenne, WY

May 15, 2015Cheyenne County, Morrill County, Nebraska

NWS Cheyenne, WY issued this tornado warning at May 15, 2015, 2:33 PM MDT for Cheyenne County, Morrill County, Nebraska. It was in force for 42 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: May 15, 2015, 2:33 PM MDT (20:33 UTC)
Expired: May 15, 2015, 3:15 PM MDT
In force: 42 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Cheyenne County, NE, Morrill County, NE

The radar

The Cheyenne radar (KCYS), 140 km from the middle of the area, began a volume at 20:33 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
May 15, 2:38 PM MDT	HAIL 1	9 W Gurley, NE
May 15, 2:40 PM MDT	HAIL 1.25	10 N Brownson, 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
May 15, 12:58 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 8.6 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: 15 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

290 
WFUS55 KCYS 152033
TORCYS
NEC033-123-152115-
/O.NEW.KCYS.TO.W.0003.150515T2033Z-150515T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
233 PM MDT FRI MAY 15 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHWESTERN MORRILL COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 315 PM MDT
    
* AT 233 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 7 MILES NORTHWEST OF BROWNSON...OR 13 MILES
  NORTHWEST OF SIDNEY...MOVING NORTH AT 25 MPH.

  HAZARD...TORNADO AND QUARTER 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 AND SOUTHWESTERN MORRILL 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 IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE.

&&

LAT...LON 4124 10307 4121 10319 4148 10336 4152 10305
TIME...MOT...LOC 2033Z 166DEG 21KT 4126 10316 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

RUBIN

2 follow-up statements

997 
WWUS55 KCYS 152053
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
253 PM MDT FRI MAY 15 2015

NEC033-123-152115-
/O.CON.KCYS.TO.W.0003.000000T0000Z-150515T2115Z/
CHEYENNE NE-MORRILL NE-
253 PM MDT FRI MAY 15 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM MDT FOR
NORTHWESTERN CHEYENNE AND SOUTHWESTERN MORRILL COUNTIES...
    
AT 252 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 8 MILES WEST OF DALTON...OR 19 MILES NORTHWEST OF
SIDNEY...MOVING NORTH AT 25 MPH.

HAZARD...TORNADO AND QUARTER 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 AND SOUTHWESTERN MORRILL COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4135 10306 4131 10325 4148 10336 4152 10305
TIME...MOT...LOC 2052Z 180DEG 22KT 4139 10314 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

RUBIN

725 
WWUS55 KCYS 152107
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
307 PM MDT FRI MAY 15 2015

NEC033-123-152117-
/O.EXP.KCYS.TO.W.0003.000000T0000Z-150515T2115Z/
CHEYENNE NE-MORRILL NE-
307 PM MDT FRI MAY 15 2015

...THE TORNADO WARNING FOR NORTHWESTERN CHEYENNE AND SOUTHWESTERN
MORRILL COUNTIES WILL EXPIRE AT 315 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR CENTRAL
NEBRASKA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
CHEYENNE.

LAT...LON 4135 10306 4131 10325 4148 10336 4152 10305
TIME...MOT...LOC 2103Z 166DEG 21KT 4139 10314 

$$

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 1:11 AM MDT	Special Weather Statement	CYS	Cheyenne	49 min
May 15, 2:40 AM MDT	Special Weather Statement	CYS	Morrill	50 min
May 15, 1:45 PM MDT	Special Weather Statement	CYS	Cheyenne	45 min
May 15, 1:50 PM MDT	Special Weather Statement	CYS	Cheyenne	40 min
May 15, 2:14 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	61 min
May 15, 2:36 PM MDT	Special Weather Statement	CYS	Box Butte	39 min
May 15, 2:44 PM MDT	Special Weather Statement	CYS	Scotts Bluff	46 min
May 15, 2:47 PM MDT	Special Weather Statement	CYS	Dawes	43 min
May 15, 2:54 PM MDT	Special Weather Statement	CYS	Box Butte	51 min
May 15, 3:02 PM MDT	Special Weather Statement	CYS	Dawes	43 min
May 15, 3:11 PM MDT	Special Weather Statement	CYS	Morrill	49 min
May 15, 3:25 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	65 min
May 15, 3:29 PM MDT	Special Weather Statement	CYS	Sioux	46 min
May 15, 4:00 PM MDT	Tornado Warning Tornado observed	CYS	Sioux	45 min
May 15, 4:14 PM MDT	Special Weather Statement	CYS	Kimball	31 min
May 15, 4:38 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Morrill	67 min
May 15, 4:52 PM MDT	Special Weather Statement	CYS	Morrill	38 min
May 15, 4:56 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	40 min
May 15, 5:11 PM MDT	Special Weather Statement	CYS	Dawes	49 min
May 15, 5:17 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	32 min
May 15, 5:33 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	57 min
May 15, 5:45 PM MDT	Special Weather Statement	CYS	Sioux	45 min

Nearby

Tornado Warnings in Nebraska, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.