Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 37, NWS North Platte, NE

July 11, 2011Cherry County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 11, 2011, 7:17 PM MDT for Cherry County, Nebraska. It was in force for 28 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 11, 2011, 7:17 PM MDT (01:17 UTC)
Expired: Jul 11, 2011, 7:45 PM MDT
In force: 28 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Cherry County, NE

The radar

The North Platte radar (KLNX), 87 km from the middle of the area, began a volume at 01:17 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 11, 7:35 PM MDT	HAIL 1	17 N Whitman, 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
Jul 11, 4:06 PM MDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.3 hours before the alert went out and 149 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: 2166 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1348 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

225 
WFUS53 KLBF 120117
TORLBF
NEC031-120145-
/O.NEW.KLBF.TO.W.0037.110712T0117Z-110712T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
717 PM MDT MON JUL 11 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL CHERRY COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 745 PM MDT

* AT 712 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WHITMAN ROAD CROSSING THE NORTH BRANCH OF
  THE MIDDLE LOUP RIVER...OR 28 MILES NORTHWEST OF MULLEN...AND
  MOVING NORTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHERN CHERRY COUNTY.

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 4237 10160 4229 10135 4213 10150 4217 10167
TIME...MOT...LOC 0118Z 199DEG 18KT 4224 10153

$$

BROOKS

1 follow-up statement

347 
WWUS53 KLBF 120145
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
845 PM CDT MON JUL 11 2011

NEC031-120155-
/O.EXP.KLBF.TO.W.0037.000000T0000Z-110712T0145Z/
CHERRY NE-
745 PM MDT MON JUL 11 2011

...THE TORNADO WARNING FOR SOUTH CENTRAL CHERRY COUNTY HAS EXPIRED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 9 PM MDT.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH 
CENTRAL CHERRY COUNTY UNTIL 815 PM MDT.

LAT...LON 4237 10160 4229 10135 4213 10150 4217 10167
TIME...MOT...LOC 0145Z 199DEG 18KT 4237 10147

$$

BROOKS

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 6:14 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	61 min
Jul 11, 6:19 PM MDT	Tornado Warning	LBF	Cherry	41 min
Jul 11, 7:02 PM MDT	Tornado Warning	LBF	Cherry	41 min
Jul 11, 7:12 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	63 min
Jul 11, 7:23 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	67 min
Jul 11, 7:55 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	50 min
Jul 11, 8:40 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	65 min
Jul 11, 10:37 PM MDT	Severe Thunderstorm Warning	LBF	Hooker, Logan, McPherson, Thomas	53 min
Jul 11, 11:18 PM MDT	Tornado Warning	LBF	Thomas	27 min
Jul 12, 3:00 PM MDT	Flash Flood Watch	LBF	Chase, Deuel, Hayes, Keith, Lincoln, Perkins	15 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.