Alert archive / Nebraska / Tornado Warnings in 2014

Tornado Warning 5, NWS Cheyenne, WY

May 20, 2014Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at May 20, 2014, 5:23 PM MDT for Scotts Bluff County, Sioux County, Nebraska. It was in force for 37 min. 3 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 20, 2014, 5:23 PM MDT (23:23 UTC)
Expired: May 20, 2014, 6:00 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Scotts Bluff County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 131 km from the middle of the area, began a volume at 23:27 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
May 20, 5:23 PM MDT	HAIL 1	6 N Morrill, NE
May 20, 5:25 PM MDT	FUNNEL CLOUD	7 N Stegall, NE
May 20, 6:04 PM MDT	FUNNEL CLOUD	6 Ne Scottsbluff, 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 20, 2:31 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.4 hours before the alert went out and 239 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: 1818 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: -5 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.

505 
WFUS55 KCYS 202323
TORCYS
NEC157-165-210000-
/O.NEW.KCYS.TO.W.0005.140520T2323Z-140521T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
523 PM MDT TUE MAY 20 2014

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 600 PM MDT

* AT 522 PM MDT...A CONFIRMED TORNADO WAS LOCATED NEAR MITCHELL...AND
  MOVING EAST AT 20 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.

* THE TORNADO WILL BE NEAR...
  MITCHELL AROUND 530 PM MDT.
  LAKE ALICE AND WESTERN NEBRASKA REGIONAL AIRPORT AROUND 600 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4209 10350 4177 10363 4198 10402 4213 10397
TIME...MOT...LOC 2323Z 282DEG 16KT 4197 10384

TORNADO...OBSERVED
HAIL...1.00IN

$$

HAMMER/TRUDEL

1 follow-up statement

169 
WWUS55 KCYS 202342
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
542 PM MDT TUE MAY 20 2014

NEC157-165-210000-
/O.CON.KCYS.TO.W.0005.000000T0000Z-140521T0000Z/
SCOTTS BLUFF NE-SIOUX NE-
542 PM MDT TUE MAY 20 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL SIOUX AND
NORTH CENTRAL SCOTTS BLUFF COUNTIES UNTIL 600 PM MDT...

AT 537 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED NEAR MITCHELL...AND MOVING EAST AT 20 MPH. THE TORNADIC 
PART OF THIS STORM WILL REMAIN OVER NORTHERN SCOTTS BLUFF COUNTY. 

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 DANGEROUS STORM WILL BE NEAR...
  LAKE ALICE AND SCOTTSBLUFF AROUND 555 PM MDT.
  WESTERN NEBRASKA REGIONAL AIRPORT AROUND 600 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF 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 IN
CHEYENNE.

&&

LAT...LON 4209 10350 4179 10362 4195 10388 4209 10381
TIME...MOT...LOC 2342Z 282DEG 16KT 4195 10373

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

$$

HAMMER/TRUDEL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 6:08 PM MDT	Special Weather Statement	CYS	Morrill	52 min
May 19, 6:10 PM MDT	Special Weather Statement	CYS	Banner	65 min
May 19, 6:12 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	63 min
May 19, 6:15 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Morrill, Scotts Bluff	60 min
May 19, 6:44 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	61 min
May 19, 7:04 PM MDT	Special Weather Statement	CYS	Morrill	26 min
May 19, 7:45 PM MDT	Special Weather Statement	CYS	Cheyenne	45 min
May 19, 8:01 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	44 min
May 20, 5:00 PM MDT	Flash Flood Warning	CYS	Scotts Bluff, Sioux	6 hr
May 20, 5:13 PM MDT	Special Weather Statement	CYS	Scotts Bluff	62 min

Nearby

Tornado Warnings in Nebraska, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.