Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 30, NWS Cheyenne, WY

July 16, 2011Kimball County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jul 16, 2011, 9:58 PM MDT for Kimball 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 16, 2011, 9:58 PM MDT (03:58 UTC)
Expired
Jul 16, 2011, 10:35 PM MDT
In force
37 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon

County Kimball County, NE

The radar

The Cheyenne radar (KCYS), 70 km from the middle of the area, began a volume at 04:01 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

TimeReportWhereRemark
Jul 16, 10:27 PM MDTHAIL 1.75Oliver Reservoir, NEGOLF BALL SIZED HAIL WAS ACCOMPANIED BY TORRENTIAL RAIN.

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 00:00Z, 4.0 hours before the alert went out and 153 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2011-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1193 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2011-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1193 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
2264 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
288 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.8

Open this sounding in Storm Lab

The text

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

867 
WFUS55 KCYS 170358
TORCYS
NEC105-170445-
/O.NEW.KCYS.TO.W.0030.110717T0358Z-110717T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
958 PM MDT SAT JUL 16 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN KIMBALL COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 1045 PM MDT

* AT 957 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR PANORAMA POINT...OR 22 MILES SOUTHWEST OF
  KIMBALL...AND MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PANORAMA POINT...OLIVER RESERVOIR...I-80 EXIT 8 AND BUSHNELL.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 1 AND
13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4100 10405 4118 10406 4129 10405 4131 10379
      4099 10380
TIME...MOT...LOC 0358Z 178DEG 27KT 4100 10394

$$

COX
2 follow-up statements
822 
WWUS55 KCYS 170418
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1018 PM MDT SAT JUL 16 2011

NEC105-170445-
/O.CON.KCYS.TO.W.0030.000000T0000Z-110717T0445Z/
KIMBALL NE-
1018 PM MDT SAT JUL 16 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN KIMBALL COUNTY
UNTIL 1045 PM MDT...

AT 1013 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 8 MILES NORTHEAST OF PANORAMA POINT...OR 17 MILES
SOUTHWEST OF KIMBALL...MOVING NORTH AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  OLIVER RESERVOIR...I-80 EXIT 8 AND BUSHNELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4100 10405 4118 10406 4129 10405 4131 10379
      4099 10380
TIME...MOT...LOC 0418Z 178DEG 27KT 4113 10393

$$

COX
146 
WWUS55 KCYS 170435
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1035 PM MDT SAT JUL 16 2011

NEC105-170443-
/O.CAN.KCYS.TO.W.0030.000000T0000Z-110717T0445Z/
KIMBALL NE-
1035 PM MDT SAT JUL 16 2011

...THE TORNADO WARNING FOR WESTERN KIMBALL COUNTY IS CANCELLED...

THE STORM WHICH HAD A STRONG CIRCULATION HAS NOW WEAKENED OVER THE 
AREA.  HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
KIMBALL...LARAMIE AND BANNER COUNTIES UNTIL 11 PM.

LAT...LON 4100 10405 4118 10406 4129 10405 4131 10379
      4099 10380
TIME...MOT...LOC 0433Z 178DEG 27KT 4124 10394

$$

COX

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 9:53 PM MDTSevere Thunderstorm WarningCYSBanner, Kimball58 min
Jul 16, 10:15 PM MDTSevere Thunderstorm WarningCYSKimball35 min
Jul 16, 10:54 PM MDTSevere Thunderstorm WarningCYSBanner, Morrill, Scotts Bluff66 min
Jul 16, 11:27 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill48 min
Jul 16, 11:30 PM MDTFlash Flood WarningCYSBanner, Morrill, Scotts Bluff2 hr
Jul 16, 11:48 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes42 min

Nearby

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