Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 147, NWS Omaha, NE

August 25, 2021Cass County, Douglas County, Sarpy County, Nebraska; Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Aug 25, 2021, 12:43 AM CDT for Cass County, Douglas County, Sarpy County, Nebraska; Mills County, Pottawattamie County, Iowa. It was in force for 47 min. 12 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, 12:43 AM CDT (05:43 UTC)
Expired: Aug 25, 2021, 1:30 AM CDT
In force: 47 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Mills County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 38 km from the middle of the area, began a volume at 05:46 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, 12:55 AM CDT	TSTM WND GST 48	1 Ne Chalco, NE	AWOS STATION KMLE MILLARD AIRPORT.
Aug 25, 12:58 AM CDT	HAIL 0.5	1 Nw Chalco, NE	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Aug 25, 12:58 AM CDT	HAIL 0.75	1 Sw Papillion, NE	REPORT FROM MPING: DIME (0.75 IN.).
Aug 25, 1:00 AM CDT	TSTM WND DMG	2 Se Boys Town, NE	10 INCH TREE LIMB SNAPPED AND LANDED ON PICKUP TRUCK.
Aug 25, 1:00 AM CDT	TSTM WND DMG	3 Se Boys Town, NE	SEVERAL 5 INCH TREE LIMBS SNAPPED.
Aug 25, 1:10 AM CDT	HAIL 1	La Vista, NE
Aug 25, 1:13 AM CDT	HAIL 1	Plattsmouth, NE	REPORT FROM MPING: QUARTER (1.00 IN.).
Aug 25, 1:15 AM CDT	HAIL 1	3 Ese Ralston, NE
Aug 25, 1:20 AM CDT	TSTM WND GST 53	1 Sw Council Bluffs, IA	MESONET STATION RCBI4 COUNCIL BLUFFS (I-80).
Aug 25, 1:30 AM CDT	TSTM WND DMG	2 E Ralston, NE	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2 E RALSTON. PUBLIC REPORT OF A LARGE TREE LIMB DOWN ON A POWER LINE.
Aug 25, 1:30 AM CDT	TSTM WND GST 60	2 E Ralston, NE	PUBLIC REPORT OF A LARGE TREE LIMB DOWN ON A POWER LINE.
Aug 25, 1:40 AM CDT	TSTM WND DMG	2 E Omaha, NE	LARGE TREE LIMB, 8 TO 10 INCHES IN DIAMETER, DOWN ON A HOME.

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, 5.7 hours before the alert went out and 38 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.

977 
WUUS53 KOAX 250543
SVROAX
IAC129-155-NEC025-055-153-250630-
/O.NEW.KOAX.SV.W.0147.210825T0543Z-210825T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
1243 AM CDT Wed Aug 25 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...
  Southeastern Douglas County in east central Nebraska...
  Northeastern Cass County in southeastern Nebraska...

* Until 130 AM CDT.

* At 1242 AM CDT, a severe thunderstorm was located near Papillion,
  or 9 miles southwest of Omaha, moving east at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Omaha, Papillion, La Vista and Ralston around 1255 AM CDT.
  Offutt AFB around 100 AM CDT.

Other locations in the path of this severe thunderstorm include
Bellevue, Gretna and Glenwood.

This includes the following highways...
 Interstate 29 between mile markers 29 and 58.
 Interstate 80 in Iowa between mile markers 1 and 8.
 Interstate 80 in Nebraska between mile markers 439 and 454.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4096 9617 4127 9619 4130 9608 4135 9580
      4116 9573 4096 9577
TIME...MOT...LOC 0542Z 265DEG 22KT 4114 9611 

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

$$

Petersen

1 follow-up statement

762 
WWUS53 KOAX 250618
SVSOAX

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

IAC129-155-NEC025-055-153-250630-
/O.CON.KOAX.SV.W.0147.000000T0000Z-210825T0630Z/
Mills IA-Pottawattamie IA-Sarpy NE-Douglas NE-Cass NE-
118 AM CDT Wed Aug 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR NORTHWESTERN MILLS...SOUTHWESTERN POTTAWATTAMIE...EASTERN
SARPY...SOUTHEASTERN DOUGLAS AND NORTHEASTERN CASS COUNTIES...

At 118 AM CDT, a severe thunderstorm was located 5 miles east of
Bellevue, or 12 miles southeast of Omaha, 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...
Omaha, Council Bluffs, Bellevue, Papillion, La Vista, Plattsmouth,
Ralston, Glenwood, Springfield, Pacific Junction, Cedar Creek, Offutt
AFB, Millard, Carter Lake, Boys Town, Lake Manawa State Park, Camp
Maha, Chalco and Narrows River Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4102 9615 4127 9619 4130 9608 4135 9580
      4116 9573 4096 9577
TIME...MOT...LOC 0618Z 265DEG 22KT 4116 9582 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 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, 1:00 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Washington	24 min
Aug 25, 1:16 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe	44 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.