Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 76, NWS Hastings, NE

August 18, 2011Polk County, York County, Nebraska

NWS Hastings, NE issued this tornado warning at Aug 18, 2011, 8:45 PM CDT for Polk County, York County, Nebraska. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 18, 2011, 8:45 PM CDT (01:45 UTC)
Expired
Aug 18, 2011, 9:06 PM CDT
In force
21 min
Issued by
NWS Hastings, NE
Area
Storm-based polygon

Counties Polk County, NE, York County, NE

The radar

The Omaha radar (KOAX), 105 km from the middle of the area, began a volume at 01:45 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 18, 6:38 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.8 hours before the alert went out and 104 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, Omaha, NE at 00:00Z on 2011-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1385 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, Omaha, NE at 00:00Z on 2011-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 289 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
1385 J/kg
Mixed-layer CIN
-135 J/kg
Mixed-layer LCL
582 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
289 m²/s²
0-3 km storm-relative helicity
636 m²/s²
Significant tornado parameter
0.0
Supercell composite
47.4

Open this sounding in Storm Lab

The text

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

571 
WFUS53 KGID 190145
TORGID
NEC143-185-190215-
/O.NEW.KGID.TO.W.0076.110819T0145Z-110819T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
845 PM CDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL POLK COUNTY IN EAST CENTRAL NEBRASKA...
  NORTHEASTERN YORK COUNTY IN EAST CENTRAL NEBRASKA...

* UNTIL 915 PM CDT

* AT 843 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTHWEST OF OSCEOLA...OR 18 MILES
  SOUTHWEST OF COLUMBUS...AND MOVING SOUTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OSCEOLA...STROMSBURG...BENEDICT AND THAYER.

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 4089 9767 4126 9773 4131 9766 4131 9760
      4133 9759 4134 9750 4093 9737
TIME...MOT...LOC 0145Z 350DEG 26KT 4123 9759
HAIL <.75IN

$$

HEINLEIN
2 follow-up statements
376 
WWUS53 KGID 190201
SVSGID

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HASTINGS NE
901 PM CDT THU AUG 18 2011

NEC143-185-190215-
/O.CON.KGID.TO.W.0076.000000T0000Z-110819T0215Z/
POLK NE-YORK NE-
901 PM CDT THU AUG 18 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN YORK AND
SOUTHERN POLK COUNTIES UNTIL 915 PM CDT...

AT 857 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR STROMSBURG...OR 17 MILES NORTH OF YORK...
MOVING SOUTH AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  BENEDICT AND THAYER.

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 4089 9767 4114 9769 4116 9764 4119 9759
      4122 9754 4123 9748 4093 9737
TIME...MOT...LOC 0201Z 350DEG 26KT 4109 9754
HAIL 0.75IN

$$

HEINLEIN
085 
WWUS53 KGID 190206
SVSGID

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HASTINGS NE
906 PM CDT THU AUG 18 2011

NEC143-185-190215-
/O.CAN.KGID.TO.W.0076.000000T0000Z-110819T0215Z/
POLK NE-YORK NE-
906 PM CDT THU AUG 18 2011

...THE TORNADO WARNING FOR NORTHEASTERN YORK AND SOUTH CENTRAL POLK
COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND NO LONGER 
POSES A TORNADO THREAT. HOWEVER...A SEVERE THUNDERSTORM WARNING IS 
STILL IN EFFECT FOR SOUTHEASTERN POLK AND EASTERN YORK COUNTIES UNTIL 
945 PM CDT. 

A TORNADO WATCH REMAINS IN EFFECT. 

LAT...LON 4089 9767 4114 9769 4116 9764 4119 9759
      4122 9754 4123 9748 4093 9737
TIME...MOT...LOC 0205Z 350DEG 26KT 4106 9753

$$

HEINLEIN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 7:59 PM CDTTornado WarningGIDMerrick, Nance31 min
Aug 18, 8:22 PM CDTSevere Thunderstorm WarningGIDMerrick, Polk38 min
Aug 18, 8:27 PM CDTTornado WarningGIDMerrick, Nance, Polk33 min
Aug 18, 9:02 PM CDTSevere Thunderstorm WarningGIDPolk, York43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.