Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 7, NWS Hastings, NE

May 11, 2011Hamilton County, Polk County, York County, Nebraska

NWS Hastings, NE issued this tornado warning at May 11, 2011, 2:50 PM CDT for Hamilton County, Polk County, York County, Nebraska. It was in force for 25 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 11, 2011, 2:50 PM CDT (19:50 UTC)
Expired: May 11, 2011, 3:15 PM CDT
In force: 25 min
Issued by: NWS Hastings, NE
Area: Storm-based polygon

Counties Hamilton County, NE, Polk County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 96 km from the middle of the area, began a volume at 19:52 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 11, 2:50 PM CDT	TORNADO	5 Nne Aurora, NE	TORNADO REPORTED BY SPOTTERS AND LAW ENFORCEMENT
May 11, 2:50 PM CDT	TORNADO	6 N Hampton, NE	EVIDENCE OF TOUCHDOWN APPROXIMATELY 6 N OF HAMPTON TRACKING NORTHWARD TO 5 S AND 2 E OF HORDVILLE. ESTIMATED TOP WIND SPEED OF 95 MPH...EQUIVALENT OF A WEAK EF1...WITH A MAXIMUM WIDTH OF 200 YARDS. IN TOTAL...3 OVERTURNED IRRIGATION PIVOTS...2 DESTROYED GRAIN

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 11, 12:16 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.8 hours before the alert went out and 125 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: 909 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1123 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

100 
WFUS53 KGID 111950
TORGID
NEC081-143-185-112015-
/O.NEW.KGID.TO.W.0007.110511T1950Z-110511T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
250 PM CDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN HAMILTON COUNTY IN SOUTH CENTRAL NEBRASKA...
  SOUTHWESTERN POLK COUNTY IN EAST CENTRAL NEBRASKA...
  NORTHWESTERN YORK COUNTY IN EAST CENTRAL NEBRASKA...

* UNTIL 315 PM CDT

* AT 247 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTH OF BRADSHAW...OR 11 MILES NORTHWEST
  OF YORK...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  POLK.

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 4114 9784 4111 9761 4090 9778 4091 9800
TIME...MOT...LOC 1950Z 214DEG 29KT 4100 9775
HAIL 1.00IN

$$

BRYANT

2 follow-up statements

108 
WWUS53 KGID 111956
SVSGID

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HASTINGS NE
256 PM CDT WED MAY 11 2011

NEC081-143-185-112015-
/O.CON.KGID.TO.W.0007.000000T0000Z-110511T2015Z/
HAMILTON NE-POLK NE-YORK NE-
256 PM CDT WED MAY 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN YORK...
SOUTHWESTERN POLK AND NORTHEASTERN HAMILTON COUNTIES UNTIL 315 PM
CDT...

AT 252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
CONFIRMED TORNADO.  THIS TORNADO WAS LOCATED 6 MILES NORTH OF
HAMPTON...OR 17 MILES WEST OF YORK...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  POLK.

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 4094 9798 4114 9784 4111 9761 4090 9778
TIME...MOT...LOC 1956Z 215DEG 26KT 4099 9787
HAIL 1.00IN

$$

FAY

692 
WWUS53 KGID 112008 RRA
SVSGID

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HASTINGS NE
308 PM CDT WED MAY 11 2011

NEC081-143-185-112018-
/O.EXP.KGID.TO.W.0007.000000T0000Z-110511T2015Z/
HAMILTON NE-POLK NE-YORK NE-
308 PM CDT WED MAY 11 2011

...THE TORNADO WARNING FOR NORTHWESTERN YORK...SOUTHWESTERN POLK AND
NORTHEASTERN HAMILTON COUNTIES WILL EXPIRE AT 315 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
YORK...HAMILTON AND POLK COUNTIES UNTIL 330 PM CDT.

LAT...LON 4094 9798 4114 9784 4111 9761 4090 9778
TIME...MOT...LOC 2008Z 215DEG 26KT 4106 9780

$$

BRYANT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 8:52 AM CDT	Special Weather Statement	GID	York	38 min
May 11, 12:48 PM CDT	Special Weather Statement	GID	Franklin	27 min
May 11, 1:11 PM CDT	Special Weather Statement	GID	Webster	49 min
May 11, 1:24 PM CDT	Severe Thunderstorm Warning	GID	Nuckolls, Thayer	51 min
May 11, 1:32 PM CDT	Severe Thunderstorm Warning	GID	Adams, Webster	43 min
May 11, 1:47 PM CDT	Tornado Warning	GID	Adams	28 min
May 11, 1:59 PM CDT	Tornado Warning	GID	Adams	20 min
May 11, 2:08 PM CDT	Severe Thunderstorm Warning	GID	Clay, Fillmore	37 min
May 11, 2:22 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, York	38 min
May 11, 2:41 PM CDT	Tornado Warning	GID	York	24 min
May 11, 2:48 PM CDT	Severe Thunderstorm Warning	GID	Hall, Hamilton, Howard, Merrick, Nance, Polk and 1 more	42 min
May 11, 2:58 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, York	32 min
May 11, 3:03 PM CDT	Tornado Warning	GID	Hamilton, Merrick, Nance, Polk	27 min
May 11, 3:14 PM CDT	Tornado Warning	GID	Polk	12 min
May 11, 3:23 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, Merrick, Nance, Polk	40 min
May 11, 3:28 PM CDT	Tornado Warning	GID	Merrick, Nance	15 min

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.