Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 1, NWS Sioux Falls, SD

March 16, 2011Dakota County, Dixon County, Nebraska

NWS Sioux Falls, SD issued this tornado warning at Mar 16, 2011, 10:10 AM CDT for Dakota County, Dixon County, Nebraska. It was in force for 35 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
Mar 16, 2011, 10:10 AM CDT (15:10 UTC)
Expired
Mar 16, 2011, 10:45 AM CDT
In force
35 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon

Counties Dakota County, NE, Dixon County, NE

The radar

The Sioux Falls radar (KFSD), 114 km from the middle of the area, began a volume at 15:15 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 3.2 hours before the alert went out and 141 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 12:00Z on 2011-03-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2011-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
106 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.

200 
WFUS53 KFSD 161510
TORFSD
NEC043-051-161545-
/O.NEW.KFSD.TO.W.0001.110316T1510Z-110316T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1010 AM CDT WED MAR 16 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TEST TORNADO WARNING FOR...
  DAKOTA COUNTY IN NORTHEAST NEBRASKA...
  DIXON COUNTY IN NORTHEAST NEBRASKA...

* UNTIL 1045 AM CDT

* AT 1009 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE  
  TRACKING A TEST SEVERE THUNDERSTORM CAPABLE OF PRODUCING A 
  TEST TORNADO. THIS TEST STORM WAS LOCATED NEAR CITY A...OR 
  10 MILES SOUTHEAST OF CITY B...MOVING NORTHEAST AT 25 MPH.

* THIS TEST STORM WILL AFFECT MAINLY RURAL AREAS OF DAKOTA AND 
  DIXON COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TEST IS IN CONJUNCTION WITH NEBRASKA SEVERE WEATHER AWARENESS 
WEEK. NO SEVERE WEATHER IS OCCURRING IN THE AREA.

&&

LAT...LON 4276 9701 4271 9697 4273 9690 4271 9684
      4266 9680 4266 9672 4260 9672 4251 9663
      4252 9655 4247 9649 4247 9641 4236 9644
      4228 9634 4227 9701
TIME...MOT...LOC 1509Z 225DEG 20KT 4246 9658

$$

MJF

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.