Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Omaha, NE

April 5, 2021Antelope County, Knox County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 5, 2021, 7:06 PM CDT for Antelope County, Knox County, Nebraska. It was in force for 39 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: Apr 5, 2021, 7:06 PM CDT (00:06 UTC)
Expired: Apr 5, 2021, 7:45 PM CDT
In force: 39 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Antelope County, NE, Knox County, NE

The radar

The Sioux Falls radar (KFSD), 161 km from the middle of the area, began a volume at 00:07 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 00:00Z, 0.1 hours before the alert went out and 202 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: 820 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 2210 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

721 
WUUS53 KOAX 060006
SVROAX
NEC003-107-060045-
/O.NEW.KOAX.SV.W.0005.210406T0006Z-210406T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
706 PM CDT Mon Apr 5 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northern Antelope County in northeastern Nebraska...
  Southwestern Knox County in northeastern Nebraska...

* Until 745 PM CDT.

* At 706 PM CDT, a severe thunderstorm was located 9 miles north of
  Page, or 14 miles east of O'Neill, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Creighton, Verdigre, Winnetoon, Bazile Mills, The Highway 14 And 59
  Junction and Ashfall Fossil Beds State Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4268 9830 4275 9791 4237 9790 4238 9830
TIME...MOT...LOC 0006Z 263DEG 31KT 4254 9837 

HAIL...<.75IN
WIND...60MPH
 
$$

Mead

2 follow-up statements

599 
WWUS53 KOAX 060025
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
725 PM CDT Mon Apr 5 2021

NEC003-107-060045-
/O.CON.KOAX.SV.W.0005.000000T0000Z-210406T0045Z/
Antelope NE-Knox NE-
725 PM CDT Mon Apr 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR NORTHERN ANTELOPE AND SOUTHWESTERN KNOX COUNTIES...

At 725 PM CDT, a severe thunderstorm was located 10 miles northeast
of Page, or 19 miles east of O'Neill, moving east at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Creighton, Verdigre, Winnetoon, Bazile Mills, The Highway 14 And 59
Junction and Ashfall Fossil Beds State Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4268 9830 4275 9791 4237 9790 4238 9830
TIME...MOT...LOC 0025Z 269DEG 22KT 4252 9828 

HAIL...1.00IN
WIND...60MPH
 
$$

Mead

806 
WWUS53 KOAX 060040
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
740 PM CDT Mon Apr 5 2021

NEC003-107-060050-
/O.EXP.KOAX.SV.W.0005.000000T0000Z-210406T0045Z/
Antelope NE-Knox NE-
740 PM CDT Mon Apr 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ANTELOPE AND
SOUTHWESTERN KNOX COUNTIES WILL EXPIRE AT 745 PM CDT...
                
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 will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4268 9830 4275 9791 4237 9790 4238 9830
TIME...MOT...LOC 0040Z 263DEG 31KT 4253 9813 

$$

Mead

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 9:32 PM CDT	Special Weather Statement	OAX	Wayne	28 min
Apr 6, 3:52 AM CDT	Wind Advisory	OAX	Gage, Jefferson, Johnson, Nemaha, Pawnee, Richardson and 1 more	15 hr
Apr 6, 7:21 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	24 min
Apr 6, 7:43 AM CDT	Special Weather Statement	OAX	Lancaster	32 min
Apr 6, 7:50 AM CDT	Special Weather Statement	OAX	Lancaster	25 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Every 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.