Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 183, NWS Sioux Falls, SD

August 1, 2012Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 1, 2012, 10:56 PM CDT for Dixon County, Nebraska. It was in force for 34 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: Aug 1, 2012, 10:56 PM CDT (03:56 UTC)
Expired: Aug 1, 2012, 11:30 PM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Dixon County, NE

The radar

The Omaha radar (KOAX), 118 km from the middle of the area, began a volume at 04:00 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
Aug 1, 10:59 PM CDT	TSTM WND DMG	4 Ene Wayne, NE	A FEW TREE LIMBS DOWN.
Aug 1, 11:00 PM CDT	TSTM WND DMG	5 W Wakefield, NE	6 INCH DIAMETER LIMBS BROKEN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.9 hours before the alert went out and 118 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: 7 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 2779 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 17 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.

853 
WUUS53 KFSD 020356
SVRFSD
NEC051-020430-
/O.NEW.KFSD.SV.W.0183.120802T0356Z-120802T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1056 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN DIXON COUNTY IN NORTHEAST NEBRASKA...

* UNTIL 1130 PM CDT

* AT 1056 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS
  IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WAYNE...OR 26
  MILES SOUTHWEST OF PONCA...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WAKEFIELD AROUND 1115 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4227 9703 4243 9703 4238 9673 4237 9672
      4227 9672 4226 9673 4226 9701
TIME...MOT...LOC 0356Z 268DEG 19KT 4226 9700
WIND...HAIL 60MPH <1.00IN

$$
CHAPMAN

2 follow-up statements

035 
WWUS53 KFSD 020418
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1118 PM CDT WED AUG 1 2012

NEC051-020430-
/O.CON.KFSD.SV.W.0183.000000T0000Z-120802T0430Z/
DIXON NE-
1118 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN DIXON
COUNTY UNTIL 1130 PM CDT...

AT 1118 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WAKEFIELD...OR 22
MILES SOUTHWEST OF PONCA...MOVING EAST AT 25 MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHERN
DIXON COUNTY.

AT 1053 PM CDT...THIS STORM PRODUCED WINDS OF 58 MPH AT WAYNE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4227 9703 4243 9703 4238 9673 4237 9672
      4227 9672 4226 9673 4226 9701
TIME...MOT...LOC 0416Z 264DEG 21KT 4229 9689
WIND...HAIL 60MPH <1.00IN

$$

CHAPMAN

950 
WWUS53 KFSD 020431
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1131 PM CDT WED AUG 1 2012

NEC051-020441-
/O.EXP.KFSD.SV.W.0183.000000T0000Z-120802T0430Z/
DIXON NE-
1131 PM CDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN DIXON COUNTY HAS
EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA...HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS 
THUNDERSTORM...ESPECIALLY AREAS NEAR EMERSON AND ALONG THE THURSTON 
COUNTY LINE.

LAT...LON 4227 9703 4243 9703 4238 9673 4237 9672
      4227 9672 4226 9673 4226 9701
TIME...MOT...LOC 0418Z 264DEG 21KT 4229 9687

$$

CHAPMAN

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012 Every severe thunderstorm warning in 2012

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.