Alert archive / Nebraska / Tornado Warnings in 2013

Tornado Warning 9, NWS Cheyenne, WY

May 27, 2013Box Butte County, Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at May 27, 2013, 4:02 PM MDT for Box Butte County, Dawes County, Sioux County, Nebraska. It was in force for 28 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 27, 2013, 4:02 PM MDT (22:02 UTC)
Expired: May 27, 2013, 4:30 PM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Box Butte County, NE, Dawes County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 185 km from the middle of the area, began a volume at 22:02 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 27, 4:05 PM MDT	TORNADO	18 W Hemingford, NE
May 27, 4:20 PM MDT	HAIL 1	15 W Hemingford, NE	HALF INCH TO QUARTER SIZED HAIL. GRASS IS COVERED WITH HAIL. 0.5 INCHES OF NEW RAINFALL.

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 27, 1:19 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.0 hours before the alert went out and 187 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: 832 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

638 
WFUS55 KCYS 272202
TORCYS
NEC013-045-165-272230-
/O.NEW.KCYS.TO.W.0009.130527T2202Z-130527T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
402 PM MDT MON MAY 27 2013

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHWESTERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA...
  EAST CENTRAL SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 430 PM MDT

* AT 358 PM MDT...A CONFIRMED TORNADO WAS LOCATED NEAR FLAHERTYS
  CORNER...AND MOVING EAST AT 15 MPH.

  HAZARD...DAMAGING TORNADO AND QUARTER SIZE HAIL.

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
           SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
           OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
           EXTENSIVE TREE DAMAGE IS LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  MARSLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

&&

LAT...LON 4263 10321 4212 10317 4226 10359 4247 10361
TIME...MOT...LOC 2202Z 261DEG 15KT 4231 10344

TORNADO...OBSERVED
HAIL...1.00IN

$$

RUBIN

2 follow-up statements

815 
WWUS55 KCYS 272217
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
417 PM MDT MON MAY 27 2013

NEC013-045-165-272230-
/O.CON.KCYS.TO.W.0009.000000T0000Z-130527T2230Z/
BOX BUTTE NE-DAWES NE-SIOUX NE-
417 PM MDT MON MAY 27 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL SIOUX...
SOUTHWESTERN DAWES AND NORTHWESTERN BOX BUTTE COUNTIES UNTIL 430 PM
MDT...

AT 412 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR FLAHERTYS CORNER...AND MOVING EAST AT 15 MPH.

HAZARD...DEVELOPING TORNADO AND HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
         SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
         OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
         EXTENSIVE TREE DAMAGE IS LIKELY.

THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL
SIOUX...NORTHWESTERN BOX BUTTE AND SOUTHWESTERN DAWES COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4224 10342 4249 10355 4263 10321 4212 10317
TIME...MOT...LOC 2217Z 269DEG 14KT 4230 10337

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

$$

RUBIN

298 
WWUS55 KCYS 272229
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
429 PM MDT MON MAY 27 2013

NEC013-045-165-272240-
/O.EXP.KCYS.TO.W.0009.000000T0000Z-130527T2230Z/
BOX BUTTE NE-DAWES NE-SIOUX NE-
429 PM MDT MON MAY 27 2013

...THE TORNADO WARNING FOR EAST CENTRAL SIOUX...SOUTHWESTERN DAWES
AND NORTHWESTERN BOX BUTTE COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT.

LAT...LON 4224 10342 4249 10355 4263 10321 4212 10317
TIME...MOT...LOC 2230Z 269DEG 14KT 4230 10330

$$

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 8:01 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	44 min
May 26, 8:30 PM MDT	Special Weather Statement	CYS	Scotts Bluff	45 min
May 26, 9:05 PM MDT	Special Weather Statement	CYS	Scotts Bluff	25 min
May 26, 9:22 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Morrill, Scotts Bluff	38 min
May 26, 9:53 PM MDT	Special Weather Statement	CYS	Scotts Bluff	52 min
May 26, 10:16 PM MDT	Special Weather Statement	CYS	Box Butte	44 min
May 27, 2:00 PM MDT	Special Weather Statement	CYS	Banner	60 min
May 27, 2:05 PM MDT	Tornado Warning Tornado observed	CYS	Banner, Kimball	25 min
May 27, 2:28 PM MDT	Tornado Warning Tornado observed	CYS	Banner, Cheyenne, Kimball, Morrill	32 min
May 27, 2:57 PM MDT	Special Weather Statement	CYS	Cheyenne	48 min
May 27, 3:33 PM MDT	Special Weather Statement	CYS	Banner	42 min
May 27, 3:36 PM MDT	Special Weather Statement	CYS	Morrill	39 min
May 27, 3:38 PM MDT	Special Weather Statement	CYS	Box Butte	52 min
May 27, 3:45 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Morrill	60 min
May 27, 3:57 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	63 min
May 27, 4:11 PM MDT	Special Weather Statement	CYS	Dawes	64 min
May 27, 4:32 PM MDT	Special Weather Statement	CYS	Dawes	58 min
May 27, 4:43 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	62 min
May 27, 4:46 PM MDT	Special Weather Statement	CYS	Box Butte	59 min
May 27, 4:47 PM MDT	Special Weather Statement	CYS	Box Butte	58 min
May 27, 5:28 PM MDT	Special Weather Statement	CYS	Box Butte	62 min
May 27, 5:35 PM MDT	Special Weather Statement	CYS	Scotts Bluff	40 min
May 27, 5:48 PM MDT	Special Weather Statement	CYS	Box Butte	57 min

Nearby

Tornado Warnings in Nebraska, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.