Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 101, NWS Omaha, NE

July 9, 20218 counties in Nebraska; Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 9, 2021, 11:55 PM CDT for 8 counties in Nebraska; Mills County, Pottawattamie County, Iowa. It was in force for 65 min. 23 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: Jul 9, 2021, 11:55 PM CDT (04:55 UTC)
Expired: Jul 10, 2021, 1:00 AM CDT
In force: 65 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 75.0 mph

Counties Mills County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Otoe County, NE, Sarpy County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 61 km from the middle of the area, began a volume at 04:54 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
Jul 10, 12:13 AM CDT	TSTM WND GST 64	4 Wnw Lincoln, NE	ASOS.
Jul 10, 12:15 AM CDT	TSTM WND GST 62	3 W Millard, NE
Jul 10, 12:24 AM CDT	TSTM WND DMG	2 S Elkhorn, NE	LARGE TREES DOWN.
Jul 10, 12:25 AM CDT	TSTM WND DMG	2 W Offutt Afb, NE	TRAINED SPOTTER REPORTED 3 INCH TREE BRANCH BLOWN OFF OF A HEALTHY TREE.
Jul 10, 12:26 AM CDT	TSTM WND GST 64	2 Sse Papillion, NE
Jul 10, 12:27 AM CDT	TSTM WND DMG	3 W Offutt Afb, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:30 AM CDT	TSTM WND DMG	3 Nw Ralston, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:31 AM CDT	TSTM WND GST 59	1 N Firth, NE
Jul 10, 12:33 AM CDT	TSTM WND DMG	3 Ene Ralston, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:33 AM CDT	TSTM WND GST 58	2 Ene Council Bluffs, IA
Jul 10, 12:33 AM CDT	TSTM WND GST 65	Cedar Creek, NE	CORRECTS PREVIOUS TSTM WND GST REPORT FROM CEDAR CREEK.
Jul 10, 12:36 AM CDT	TSTM WND DMG	3 Wsw Bellevue, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:39 AM CDT	TSTM WND DMG	2 Ssw Papillion, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:41 AM CDT	TSTM WND GST 76	3 Sse Plattsmouth, NE
Jul 10, 12:45 AM CDT	TSTM WND DMG	3 Nw Millard, NE	PORTION OF A ROOF IS TORE OFF.
Jul 10, 12:45 AM CDT	TSTM WND DMG	Plattsmouth, NE	NUMEROUS TREES DOWN IN PLATTSMOUTH. NO POWER.
Jul 10, 12:46 AM CDT	TSTM WND DMG	Union, NE	PUBLIC REPORTED SEVERAL POWER POLES DOWN, ROOF BLOWN OFF A BARN, AND CAMPER BLOWN OVER AND HEAVILY DAMAGED.
Jul 10, 12:48 AM CDT	TSTM WND DMG	2 W Offutt Afb, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 12:48 AM CDT	TSTM WND DMG	4 Sse Murray, NE	GRAIN BINS SIGNIFICANTLY DAMAGED BETWEEN UNION AND MURRAY.
Jul 10, 12:50 AM CDT	TSTM WND GST 65	Cedar Creek, NE
Jul 10, 12:51 AM CDT	TSTM WND DMG	2 W Offutt Afb, NE	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Jul 10, 1:00 AM CDT	TSTM WND GST 60	4 Sw Cook, NE
Jul 10, 1:09 AM CDT	TSTM WND DMG	2 Wsw Council Bluffs, IA	SEMI TRAILER ON ITS SIDE.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 9, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.9 hours before the alert went out and 61 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: 2603 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted.

716 
WUUS53 KOAX 100455
SVROAX
IAC129-155-NEC025-055-067-097-109-131-153-155-100600-
/O.NEW.KOAX.SV.W.0101.210710T0455Z-210710T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
1155 PM CDT Fri Jul 9 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northwestern Mills County in southwestern Iowa...
  Southwestern Pottawattamie County in southwestern Iowa...
  Sarpy County in east central Nebraska...
  Lancaster County in southeastern Nebraska...
  Johnson County in southeastern Nebraska...
  Otoe County in southeastern Nebraska...
  Southern Douglas County in east central Nebraska...
  Southeastern Saunders County in east central Nebraska...
  Northern Gage County in southeastern Nebraska...
  Cass County in southeastern Nebraska...

* Until 100 AM CDT.

* At 1154 PM CDT, severe thunderstorms were located along a line
  extending from Weston to De Witt, moving east at 60 mph.

  HAZARD...75 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Weston around 1200 AM CDT.
  Yutan around 1210 AM CDT.

Other locations in the path of these severe thunderstorms include
Gretna, Elkhorn, Sterling, Millard, Papillion, La Vista, Ralston,
Tecumseh, Bellevue, Cook and Council Bluffs.

This includes the following highways...
 Interstate 29 between mile markers 37 and 53.
 Interstate 80 in Iowa between mile markers 1 and 5.
 Interstate 80 in Nebraska between mile markers 395 and 454.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows! 

&&

LAT...LON 4035 9691 4119 9676 4119 9647 4126 9647
      4125 9581 4109 9581 4079 9589 4052 9604
      4052 9607 4048 9606 4034 9609
TIME...MOT...LOC 0454Z 265DEG 53KT 4119 9672 4037 9690 

HAIL...0.75IN
WIND...75MPH
 
$$

DeWald

2 follow-up statements

651 
WWUS53 KOAX 100525
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1225 AM CDT Sat Jul 10 2021

IAC129-155-NEC025-055-067-097-109-131-153-155-100600-
/O.CON.KOAX.SV.W.0101.000000T0000Z-210710T0600Z/
Mills IA-Pottawattamie IA-Sarpy NE-Lancaster NE-Johnson NE-Otoe NE-
Douglas NE-Saunders NE-Gage NE-Cass NE-
1225 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR NORTHWESTERN MILLS...SOUTHWESTERN POTTAWATTAMIE...SARPY...
LANCASTER...JOHNSON...OTOE...SOUTHERN DOUGLAS...SOUTHEASTERN
SAUNDERS...NORTHERN GAGE AND CASS COUNTIES...

At 1224 AM CDT, severe thunderstorms were located along a line
extending from 4 miles west of Millard to 5 miles southwest of
Sterling, moving east at 55 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Public.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Southern Omaha, Lincoln, Council Bluffs, Bellevue, Papillion, La
Vista, Plattsmouth, Ralston, Gretna, Waverly, Ashland, Syracuse,
Tecumseh, Hickman, Springfield, Yutan, Louisville, Weeping Water,
Bennet and Elmwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows.
 
&&

LAT...LON 4035 9691 4119 9676 4119 9647 4126 9647
      4125 9581 4109 9581 4079 9589 4052 9604
      4052 9607 4048 9606 4034 9609
TIME...MOT...LOC 0524Z 265DEG 49KT 4121 9624 4039 9642 

HAIL...0.75IN
WIND...70MPH
 
$$

DeWald

821 
WWUS53 KOAX 100531
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1231 AM CDT Sat Jul 10 2021

IAC129-155-NEC025-055-067-097-109-131-153-155-100600-
/O.CON.KOAX.SV.W.0101.000000T0000Z-210710T0600Z/
Mills IA-Pottawattamie IA-Sarpy NE-Lancaster NE-Johnson NE-Otoe NE-
Douglas NE-Saunders NE-Gage NE-Cass NE-
1231 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR NORTHWESTERN MILLS...SOUTHWESTERN POTTAWATTAMIE...SARPY...
LANCASTER...JOHNSON...OTOE...SOUTHERN DOUGLAS...SOUTHEASTERN
SAUNDERS...NORTHERN GAGE AND CASS COUNTIES...

At 1230 AM CDT, severe thunderstorms were located along a line
extending from Omaha to 5 miles southeast of Sterling, moving east at
60 mph.

HAZARD...75 mph wind gusts and penny size hail.

SOURCE...Trained weather spotters.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Southern Omaha, Lincoln, Council Bluffs, Bellevue, Papillion, La
Vista, Plattsmouth, Ralston, Gretna, Waverly, Ashland, Syracuse,
Tecumseh, Hickman, Springfield, Yutan, Louisville, Weeping Water,
Bennet and Elmwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows.
 
&&

LAT...LON 4035 9691 4119 9676 4119 9647 4126 9647
      4125 9581 4109 9581 4079 9589 4052 9604
      4052 9607 4048 9606 4034 9609
TIME...MOT...LOC 0530Z 265DEG 53KT 4122 9616 4040 9634 

HAIL...0.75IN
WIND...75MPH
 
$$

DeWald

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 9:30 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Knox, Pierce	45 min
Jul 9, 9:50 PM CDT	Special Weather Statement	OAX	Antelope, Boone	10 min
Jul 9, 10:12 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more	48 min
Jul 9, 10:15 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Platte	45 min
Jul 9, 10:52 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston	38 min
Jul 9, 10:56 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Dodge, Platte, Saunders	64 min
Jul 9, 11:00 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Madison, Pierce, Stanton, Wayne	45 min
Jul 9, 11:19 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Dodge	41 min
Jul 9, 11:26 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Gage, Lancaster, Saline, Saunders, Seward	64 min
Jul 9, 11:38 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Dodge, Douglas, Saunders, Washington	52 min
Jul 9, 11:41 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Cuming, Dodge, Platte, Saunders and 1 more	49 min
Jul 9, 11:46 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	44 min
Jul 10, 12:11 AM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Pawnee	49 min
Jul 10, 12:26 AM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders, Washington	19 min
Jul 10, 12:40 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	50 min
Jul 10, 12:42 AM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders, Washington	18 min
Jul 10, 12:44 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Gage, Johnson, Nemaha, Otoe, Pawnee and 1 more	61 min
Jul 10, 1:31 PM CDT	Special Weather Statement	OAX	Dodge, Douglas, Sarpy, Saunders, Washington	74 min
Jul 10, 1:56 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Sarpy, Saunders, Washington	64 min
Jul 10, 4:18 PM CDT	Special Weather Statement	OAX	Pawnee, Richardson	27 min
Jul 9, 11:02 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Shelby	29 min
Jul 9, 11:30 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Mills, Montgomery, Pottawattamie, Shelby	45 min
Jul 10, 12:13 AM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	47 min
Jul 10, 2:18 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	42 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Severe Thunderstorm Warnings in Iowa, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.