Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 24, NWS Cheyenne, WY

July 4, 2011Scotts Bluff County, Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jul 4, 2011, 5:08 PM MDT for Scotts Bluff County, Sioux County, Nebraska. It was in force for 37 min. 1 report 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: Jul 4, 2011, 5:08 PM MDT (23:08 UTC)
Expired: Jul 4, 2011, 5:45 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Scotts Bluff County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 128 km from the middle of the area, began a volume at 23:09 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
Jul 4, 5:09 PM MDT	FUNNEL CLOUD	23 Ssw Agate, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 240 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: 3650 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 55 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.

709 
WFUS55 KCYS 042308
TORCYS
NEC157-165-042345-
/O.NEW.KCYS.TO.W.0024.110704T2308Z-110704T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
508 PM MDT MON JUL 4 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHWESTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 545 PM MDT

* AT 504 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD 7
  MILES NORTH OF MORRILL...OR 12 MILES EAST OF TORRINGTON. A TORNADO
  MAY DEVELOP AT ANY TIME. DOPPLER RADAR SHOWED THIS DANGEROUS STORM
  MOVING SOUTHEAST AT 25 MPH.

* ALSO HAIL THE SIZE OF QUARTERS IS POSSIBLE WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  MORRILL...MITCHELL AND LAKE ALICE.

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.

&&

LAT...LON 4198 10352 4179 10379 4203 10404 4217 10389
TIME...MOT...LOC 2307Z 320DEG 21KT 4206 10392

$$

MAZUR

1 follow-up statement

160 
WWUS55 KCYS 042343
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
543 PM MDT MON JUL 4 2011

NEC157-165-042352-
/O.EXP.KCYS.TO.W.0024.000000T0000Z-110704T2345Z/
SCOTTS BLUFF NE-SIOUX NE-
543 PM MDT MON JUL 4 2011

...THE TORNADO WARNING FOR SOUTHWESTERN SIOUX AND NORTH CENTRAL
SCOTTS BLUFF COUNTIES WILL EXPIRE AT 545 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4198 10352 4179 10379 4203 10404 4217 10389
TIME...MOT...LOC 2342Z 320DEG 21KT 4190 10374

$$

MAZUR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 4:27 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	29 min
Jul 4, 4:35 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	12 min
Jul 4, 4:45 PM MDT	Tornado Warning	CYS	Sioux	27 min
Jul 4, 5:37 PM MDT	Tornado Warning	CYS	Banner, Scotts Bluff	26 min
Jul 4, 5:41 PM MDT	Flash Flood Warning	CYS	Scotts Bluff, Sioux	2 hr

Nearby

Tornado Warnings in Nebraska, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.