Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Omaha, NE

April 5, 20215 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 5, 2021, 12:24 AM CDT for 5 counties in Nebraska. It was in force for 36 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, 12:24 AM CDT (05:24 UTC)
Expired: Apr 5, 2021, 1:00 AM CDT
In force: 36 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dodge County, NE, Douglas County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 2 km from the middle of the area, began a volume at 05:28 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, 5.4 hours before the alert went out and 3 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: 452 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 3078 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

026 
WUUS53 KOAX 050524
SVROAX
NEC053-055-153-155-177-050600-
/O.NEW.KOAX.SV.W.0002.210405T0524Z-210405T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
1224 AM CDT Mon Apr 5 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sarpy County in east central Nebraska...
  Southwestern Washington County in east central Nebraska...
  Southeastern Dodge County in east central Nebraska...
  Western Douglas County in east central Nebraska...
  Eastern Saunders County in east central Nebraska...

* Until 100 AM CDT.

* At 1223 AM CDT, outflow associated with weakening showers was 
  located along a line extending from Cedar Bluffs to near Mead to 5 
  miles northwest of Ashland, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Southwestern Omaha, Fremont, Gretna, Valley, Arlington, Yutan,
  Waterloo, Cedar Bluffs, Mead, Inglewood, Elkhorn, Millard,
  Bennington, Boys Town, Washington, Memphis, Leshara, Two Rivers
  State Recreation Area, Chalco and Memphis State Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4150 9629 4139 9614 4120 9608 4108 9644
      4123 9652 4139 9663
TIME...MOT...LOC 0523Z 241DEG 24KT 4138 9662 4126 9647 4110 9644 

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

Mead

1 follow-up statement

978 
WWUS53 KOAX 050558
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1258 AM CDT Mon Apr 5 2021

NEC053-055-153-155-177-050603-
/O.EXP.KOAX.SV.W.0002.000000T0000Z-210405T0600Z/
Sarpy NE-Washington NE-Dodge NE-Douglas NE-Saunders NE-
1258 AM CDT Mon Apr 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SARPY...
SOUTHWESTERN WASHINGTON...SOUTHEASTERN DODGE...WESTERN DOUGLAS AND
EASTERN SAUNDERS COUNTIES WILL EXPIRE AT 100 AM CDT...
            
The strong winds which prompted the warning have weakened below 
severe limits, and no longer pose an immediate threat to life or 
property. Therefore, the warning will be allowed to expire. However, 
wind gusts of 50 to 55 mph winds are still possible with the showers 
moving through the area.

LAT...LON 4150 9629 4139 9614 4120 9608 4108 9644
      4123 9652 4139 9663
TIME...MOT...LOC 0553Z 241DEG 24KT 4147 9639 4135 9624 4119 9621 

$$

Mead

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 8:21 PM CDT	Special Weather Statement	OAX	Butler	39 min
Apr 4, 10:44 PM CDT	Special Weather Statement	OAX	Platte	31 min
Apr 4, 11:03 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Platte	14 min
Apr 4, 11:47 PM CDT	Special Weather Statement	OAX	Colfax	28 min
Apr 5, 1:07 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Dodge, Washington	23 min
Apr 5, 1:28 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	32 min
Apr 5, 2:05 AM CDT	Special Weather Statement	OAX	Colfax, Dodge, Saunders	55 min
Apr 5, 2:08 AM CDT	Special Weather Statement	OAX	Burt	52 min
Apr 5, 2:52 AM CDT	Special Weather Statement	OAX	Dodge, Douglas, Washington	53 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.