Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 149, NWS Omaha, NE

August 25, 2021Cass County, Lancaster County, Otoe County, Nebraska; Fremont County, Mills County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Aug 25, 2021, 1:16 AM CDT for Cass County, Lancaster County, Otoe County, Nebraska; Fremont County, Mills County, Iowa. It was in force for 44 min. 4 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 25, 2021, 1:16 AM CDT (06:16 UTC)
Expired: Aug 25, 2021, 2:00 AM CDT
In force: 44 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Fremont County, IA, Mills County, IA, Cass County, NE, Lancaster County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 55 km from the middle of the area, began a volume at 06:17 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 25, 1:44 AM CDT	TSTM WND DMG	3 E Murray, NE	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Aug 25, 1:55 AM CDT	TSTM WND GST 53	2 Nne Murray, NE	AWOS STATION KPMV PLATTSMOUTH AIRPORT.
Aug 25, 1:55 AM CDT	TSTM WND GST 60	3 Wnw Thurman, IA
Aug 25, 1:55 AM CDT	NON-TSTM WND GST 53	2 Nne Murray, NE	AWOS STATION KPMV PLATTSMOUTH AIRPORT.

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, 6.3 hours before the alert went out and 55 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: 3303 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1689 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 8.5

Open this sounding in Storm Lab

The text

As transmitted.

561 
WUUS53 KOAX 250616
SVROAX
IAC071-129-NEC025-109-131-250700-
/O.NEW.KOAX.SV.W.0149.210825T0616Z-210825T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
116 AM CDT Wed Aug 25 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northwestern Fremont County in southwestern Iowa...
  Southwestern Mills County in southwestern Iowa...
  East central Lancaster County in southeastern Nebraska...
  Northern Otoe County in southeastern Nebraska...
  Cass County in southeastern Nebraska...

* Until 200 AM CDT.

* At 115 AM CDT, severe thunderstorms were located along a line
  extending from Louisville to near Murdock to 4 miles west of
  Elmwood, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Louisville and Weeping Water around 120 AM CDT.
  Plattsmouth, Murray and Avoca around 135 AM CDT.

Other locations in the path of these severe thunderstorms include
Pacific Junction, Glenwood, Nehawka and Union.

This includes Interstate 29 between mile markers 17 and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4069 9589 4075 9661 4101 9626 4100 9620
      4102 9615 4104 9573 4090 9567
TIME...MOT...LOC 0615Z 271DEG 37KT 4100 9616 4092 9622 4083 9637 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Petersen

2 follow-up statements

148 
WWUS53 KOAX 250633
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
133 AM CDT Wed Aug 25 2021

NEC109-250642-
/O.CAN.KOAX.SV.W.0149.000000T0000Z-210825T0700Z/
Lancaster NE-
133 AM CDT Wed Aug 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LANCASTER COUNTY
IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

LAT...LON 4069 9589 4076 9626 4085 9633 4102 9615
      4104 9573 4090 9567
TIME...MOT...LOC 0632Z 271DEG 37KT 4100 9594 4092 9600 4083 9615 

$$

IAC071-129-NEC025-131-250700-
/O.CON.KOAX.SV.W.0149.000000T0000Z-210825T0700Z/
Fremont IA-Mills IA-Otoe NE-Cass NE-
133 AM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR NORTHWESTERN FREMONT...SOUTHWESTERN MILLS...NORTHEASTERN OTOE AND
CASS COUNTIES...

At 132 AM CDT, severe thunderstorms were located along a line
extending from near Plattsmouth to near Murray to near Avoca, moving
east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Plattsmouth and Murray around 135 AM CDT.

Other locations in the path of these severe thunderstorms include
Pacific Junction, Glenwood, Nehawka and Union.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4069 9589 4076 9626 4085 9633 4102 9615
      4104 9573 4090 9567
TIME...MOT...LOC 0632Z 271DEG 37KT 4100 9594 4092 9600 4083 9615 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Petersen

908 
WWUS53 KOAX 250644
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
144 AM CDT Wed Aug 25 2021

IAC071-129-NEC025-131-250700-
/O.CON.KOAX.SV.W.0149.000000T0000Z-210825T0700Z/
Fremont IA-Mills IA-Otoe NE-Cass NE-
144 AM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR NORTHWESTERN FREMONT...SOUTHWESTERN MILLS...NORTHEASTERN OTOE AND
EASTERN CASS COUNTIES...

At 144 AM CDT, severe thunderstorms were located along a line
extending from Pacific Junction to near Murray to Nehawka, moving
east at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Glenwood and Pacific Junction around 150 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4074 9617 4102 9615 4104 9573 4090 9567
      4069 9589
TIME...MOT...LOC 0644Z 271DEG 37KT 4100 9580 4092 9586 4083 9601 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Petersen

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 10:40 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax, Platte	50 min
Aug 24, 11:08 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Colfax	52 min
Aug 24, 11:11 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Saunders	49 min
Aug 24, 11:34 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	26 min
Aug 24, 11:45 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Saunders	14 min
Aug 25, 12:05 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Saunders	25 min
Aug 25, 12:25 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy, Saunders	50 min
Aug 25, 12:29 AM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders, Washington	31 min
Aug 25, 12:43 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	47 min
Aug 25, 1:00 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	24 min
Aug 25, 1:25 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	50 min
Aug 25, 1:53 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	37 min
Aug 25, 4:07 AM CDT	Heat Advisory	OAX	Burt, Butler, Cass, Dodge, Douglas, Gage and 12 more	40 hr
Aug 25, 4:26 AM CDT	Special Weather Statement	OAX	Richardson	34 min
Aug 25, 2:45 PM CDT	Special Weather Statement	OAX	Knox	30 min
Aug 25, 3:19 PM CDT	Special Weather Statement	OAX	Knox	41 min
Aug 25, 3:58 PM CDT	Special Weather Statement	OAX	Cedar, Knox	47 min
Aug 25, 4:12 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Knox	48 min
Aug 25, 1:58 AM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	32 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.