Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 22, NWS Sioux Falls, SD

June 29, 2017Dixon County, Nebraska; Union County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jun 29, 2017, 6:12 PM CDT for Dixon County, Nebraska; Union County, South Dakota. It was in force for 18 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
Jun 29, 2017, 6:12 PM CDT (23:12 UTC)
Expired
Jun 29, 2017, 6:30 PM CDT
In force
18 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Dixon County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 101 km from the middle of the area, began a volume at 23:16 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
Jun 29, 3:42 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.2 hours before the alert went out and 159 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 2017-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 712 joules per kilogram.LCLLFCEL10008507005003002001001 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 2017-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 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
712 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
1324 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

159 
WFUS53 KFSD 292312
TORFSD
NEC051-SDC127-292330-
/O.NEW.KFSD.TO.W.0022.170629T2312Z-170629T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
612 PM CDT THU JUN 29 2017

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Northwestern Dixon County in northeastern Nebraska...
  West central Union County in southeastern South Dakota...

* Until 630 PM CDT
    
* At 612 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Wynot, or 12 miles southwest of Vermillion, moving
  east at 65 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Maskell around 620 PM CDT. 
  Newcastle around 625 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4258 9702 4276 9701 4276 9698 4274 9696
      4272 9697 4272 9696 4273 9691 4271 9684
      4271 9681 4272 9681 4271 9675 4254 9675
TIME...MOT...LOC 2312Z 274DEG 56KT 4271 9716 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Maldonado

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 3:22 PM CDTSevere Thunderstorm WarningFSDDakota, Dixon53 min
Jun 29, 3:48 PM CDTSevere Thunderstorm WarningFSDDakota, Dixon42 min
Jun 29, 4:23 PM CDTTornado WarningFSDDakota37 min
Jun 29, 4:26 PM CDTSevere Thunderstorm WarningFSDDakota49 min
Jun 29, 4:47 PM CDTFlash Flood WarningFSDDakota3 hr
Jun 29, 5:39 PM CDTSevere Thunderstorm WarningFSDDixon36 min
Jun 29, 6:03 PM CDTSevere Thunderstorm WarningFSDDixon27 min
Jun 29, 6:27 PM CDTSevere Thunderstorm WarningFSDDixon33 min
Jun 29, 3:41 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Douglas34 min
Jun 29, 3:47 PM CDTSevere Thunderstorm WarningFSDAurora, Douglas28 min
Jun 29, 3:57 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Douglas33 min
Jun 29, 4:06 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Douglas24 min
Jun 29, 4:15 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson30 min
Jun 29, 4:16 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix29 min
Jun 29, 4:40 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson35 min
Jun 29, 5:01 PM CDTSevere Thunderstorm WarningFSDBon Homme, Hutchinson, Yankton29 min
Jun 29, 5:23 PM CDTSevere Thunderstorm WarningFSDBon Homme, Hutchinson, Turner, Yankton37 min

Nearby

Tornado Warnings in Nebraska, 2017Tornado Warnings in South Dakota, 2017Every tornado warning in 2017Tornadoes in 2017

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.