Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Sioux Falls, SD

July 8, 2021Dakota County, Dixon County, Nebraska; Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 8, 2021, 11:45 PM CDT for Dakota County, Dixon County, Nebraska; Woodbury County, Iowa. It was in force for 45 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
Jul 8, 2021, 11:45 PM CDT (04:45 UTC)
Expired
Jul 9, 2021, 12:30 AM CDT
In force
45 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Woodbury County, IA, Dakota County, NE, Dixon County, NE

The radar

The Omaha radar (KOAX), 115 km from the middle of the area, began a volume at 04:45 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
Jul 8, 9:33 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.8 hours before the alert went out and 115 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 2021-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 155 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 00:00Z on 2021-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 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
155 J/kg
Mixed-layer CIN
-474 J/kg
Mixed-layer LCL
1131 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
200 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

051 
WUUS53 KFSD 090445
SVRFSD
IAC193-NEC043-051-090530-
/O.NEW.KFSD.SV.W.0051.210709T0445Z-210709T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1145 PM CDT Thu Jul 8 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Woodbury County in west central Iowa...
  Dakota County in northeastern Nebraska...
  Southwestern Dixon County in northeastern Nebraska...

* Until 1230 AM CDT.

* At 1144 PM CDT, a severe thunderstorm was located over Allen, or 11
  miles southwest of Ponca, moving east at 45 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Hubbard and Jackson In Dakota County around 1205 AM CDT.
  Homer around 1210 AM CDT.
  Sioux City, South Sioux City and Dakota City around 1215 AM CDT.
  Sergeant Bluff around 1220 AM CDT.
  Salix around 1225 AM CDT.
  Sloan around 1230 AM CDT.

Other locations impacted by this severe thunderstorm include Bronson
and Waterbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4223 9633 4226 9633 4228 9635 4228 9659
      4239 9696 4253 9692 4250 9652 4248 9649
      4249 9645 4246 9611 4221 9619 4222 9634
TIME...MOT...LOC 0444Z 281DEG 41KT 4245 9686 

HAIL...1.50IN
WIND...60MPH
 
$$

APT
2 follow-up statements
508 
WWUS53 KFSD 090509
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1209 AM CDT Fri Jul 9 2021

NEC051-090519-
/O.CAN.KFSD.SV.W.0051.000000T0000Z-210709T0530Z/
Dixon NE-
1209 AM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN DIXON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
west central Iowa...and northeastern Nebraska.

LAT...LON 4223 9633 4226 9633 4228 9635 4228 9659
      4232 9672 4242 9671 4241 9648 4240 9613
      4221 9619 4222 9634
TIME...MOT...LOC 0509Z 293DEG 39KT 4233 9659 

$$

IAC193-NEC043-090530-
/O.CON.KFSD.SV.W.0051.000000T0000Z-210709T0530Z/
Woodbury IA-Dakota NE-
1209 AM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHWESTERN WOODBURY AND SOUTHERN DAKOTA COUNTIES...

At 1209 AM CDT, a severe thunderstorm was located near Hubbard, or 15
miles southwest of Sioux City, moving southeast at 45 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Homer around 1215 AM CDT.
  Salix around 1230 AM CDT.
  Sloan around 1235 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4223 9633 4226 9633 4228 9635 4228 9659
      4232 9672 4242 9671 4241 9648 4240 9613
      4221 9619 4222 9634
TIME...MOT...LOC 0509Z 293DEG 39KT 4233 9659 

HAIL...1.50IN
WIND...60MPH
 
$$

APT
113 
WWUS53 KFSD 090530
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1230 AM CDT Fri Jul 9 2021

IAC193-NEC043-090540-
/O.EXP.KFSD.SV.W.0051.000000T0000Z-210709T0530Z/
Woodbury IA-Dakota NE-
1230 AM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WOODBURY AND
SOUTHERN DAKOTA COUNTIES HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.  However small
hail is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
west central Iowa...and northeastern Nebraska.

LAT...LON 4223 9633 4226 9633 4228 9635 4228 9659
      4232 9672 4242 9671 4241 9648 4240 9613
      4221 9619 4222 9634
TIME...MOT...LOC 0530Z 281DEG 41KT 4229 9630 

$$

APT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 11:11 PM CDTSevere Thunderstorm WarningFSDDixon34 min
Jul 8, 11:50 PM CDTSevere Thunderstorm WarningFSDPlymouth, Sioux40 min
Jul 9, 12:29 AM CDTSevere Thunderstorm WarningFSDCherokee, Plymouth46 min
Jul 9, 12:44 AM CDTSevere Thunderstorm WarningFSDPlymouth, Sioux46 min
Jul 9, 12:46 AM CDTSevere Thunderstorm WarningFSDSioux44 min
Jul 9, 2:15 AM CDTSevere Thunderstorm WarningFSDPlymouth, Sioux45 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021

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.