Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Omaha, NE

July 9, 2021Harrison County, Pottawattamie County, Iowa; 5 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 9, 2021, 11:38 PM CDT for Harrison County, Pottawattamie County, Iowa; 5 counties in Nebraska. It was in force for 52 min. 11 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, 11:38 PM CDT (04:38 UTC)
Expired
Jul 10, 2021, 12:30 AM CDT
In force
52 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Harrison County, IA, Pottawattamie County, IA, Burt County, NE, Dodge County, NE, Douglas County, NE, Saunders County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 27 km from the middle of the area, began a volume at 04:39 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

TimeReportWhereRemark
Jul 10, 12:11 AM CDTTSTM WND DMG3 Nnw Omaha, NEREPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jul 10, 12:11 AM CDTTSTM WND GST 592 Ne Bennington, NEPERSONAL WEATHER STATION.
Jul 10, 12:14 AM CDTTSTM WND GST 784 Nnw Omaha, NE
Jul 10, 12:15 AM CDTTSTM WND GST 702 W Omaha, NETRAINED SPOTTER ESTIMATED WIND GUSTS AT 70 MPH AND REPORTED A POWER OUTAGE.
Jul 10, 12:20 AM CDTTSTM WND GST 967 Ene Omaha, NECORRECTS PREVIOUS NON-TSTM WND GST REPORT FROM 7 ENE OMAHA. IT WAS A TSTM WND GST. ASOS STATION KOMA OMAHA EPPLEY AIRFIELD.
Jul 10, 12:20 AM CDTNON-TSTM WND GST 967 Ene Omaha, NEASOS STATION KOMA OMAHA EPPLEY AIRFIELD. THIS EQUALS A 96 MPH REPORT FROM AUGUST 23, 2016. WE ARE STILL CHECKING IF THIS IS THE RECORD HIGHEST FOR THE SITE.
Jul 10, 12:22 AM CDTTSTM WND DMGBlair, NEREPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jul 10, 12:23 AM CDTTSTM WND DMG1 W Omaha, NEMULTIPLE TREES DOWN AND POWER OUT.
Jul 10, 12:26 AM CDTTSTM WND DMG6 Ene Omaha, NEFROM SOCIAL MEDIA A SMALL FEDEX CARGO AIRCRAFT WAS BLOWN ACROSS TARMAC AND ONTO ITS SIDE ALONG THE AIRPORT PROPERTY FENCE LINE. TIME ESTIMATED OFF RADAR AND ASOS.
Jul 10, 12:28 AM CDTTSTM WND DMG4 Nnw Boys Town, NE4 INCH BRANCHES DOWN.
Jul 10, 12:32 AM CDTTSTM WND GST 757 Ene Omaha, NE

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.

IssuedProductOfficeLasted
Jul 9, 9:58 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.6 hours before the alert went out and 27 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2021-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2603 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2021-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

760 
WUUS53 KOAX 100438
SVROAX
IAC085-155-NEC021-053-055-155-177-100530-
/O.NEW.KOAX.SV.W.0098.210710T0438Z-210710T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
1138 PM CDT Fri Jul 9 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Northwestern Pottawattamie County in southwestern Iowa...
  Southwestern Harrison County in southwestern Iowa...
  Southeastern Burt County in east central Nebraska...
  Washington County in east central Nebraska...
  Eastern Dodge County in east central Nebraska...
  Douglas County in east central Nebraska...
  Northeastern Saunders County in east central Nebraska...

* Until 1230 AM CDT.

* At 1137 PM CDT, severe thunderstorms were located along a line
  extending from near Logan to near Uehling, moving southeast at 50
  mph.

  HAZARD...70 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...
  Arlington around 1155 PM CDT.

Other locations in the path of these severe thunderstorms include
Blair, Kennard, Fort Calhoun, Omaha and northern Council Bluffs.

People attending Omaha Country Club should seek safe shelter
immediately!

This includes Interstate 29 between mile markers 54 and 86.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4125 9582 4126 9647 4171 9646 4170 9582
TIME...MOT...LOC 0437Z 318DEG 42KT 4169 9583 4169 9645 

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

Petersen
2 follow-up statements
550 
WWUS53 KOAX 100449
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1149 PM CDT Fri Jul 9 2021

IAC085-155-NEC021-053-055-155-177-100530-
/O.CON.KOAX.SV.W.0098.000000T0000Z-210710T0530Z/
Pottawattamie IA-Harrison IA-Burt NE-Washington NE-Dodge NE-
Douglas NE-Saunders NE-
1149 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHWESTERN POTTAWATTAMIE...SOUTHWESTERN HARRISON...SOUTHEASTERN
BURT...WASHINGTON...EASTERN DODGE...DOUGLAS AND NORTHEASTERN SAUNDERS
COUNTIES...

At 1148 PM CDT, severe thunderstorms were located along a line
extending from 4 miles southeast of Logan to 8 miles northeast of
Nickerson, moving southeast at 50 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.

Locations impacted include...
  Fort Calhoun, Omaha and northern Council Bluffs.

People attending Omaha Country Club should seek safe shelter
immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4125 9582 4126 9647 4171 9646 4170 9582
TIME...MOT...LOC 0448Z 318DEG 42KT 4160 9573 4160 9634 

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

Petersen
814 
WWUS53 KOAX 100518
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
1218 AM CDT Sat Jul 10 2021

IAC085-NEC021-100527-
/O.CAN.KOAX.SV.W.0098.000000T0000Z-210710T0530Z/
Harrison IA-Burt NE-
1218 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HARRISON AND
SOUTHEASTERN BURT COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
southwestern Iowa...and east central Nebraska.

LAT...LON 4125 9582 4126 9647 4157 9646 4148 9582
TIME...MOT...LOC 0517Z 318DEG 42KT 4136 9544 4136 9605 

$$

IAC155-NEC053-055-155-177-100530-
/O.CON.KOAX.SV.W.0098.000000T0000Z-210710T0530Z/
Pottawattamie IA-Washington NE-Dodge NE-Douglas NE-Saunders NE-
1218 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHWESTERN POTTAWATTAMIE...SOUTHERN WASHINGTON...SOUTHEASTERN
DODGE...DOUGLAS AND NORTHEASTERN SAUNDERS COUNTIES...

At 1217 AM CDT, severe thunderstorms were located along a line
extending from 4 miles northwest of Oakland to Omaha, moving
southeast at 50 mph.

HAZARD...75 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Omaha, northern Council Bluffs, Fremont, Blair, Valley, Arlington,
Fort Calhoun, Waterloo, Kennard, Elkhorn, Carter Lake, Bennington,
Boys Town, Crescent, Washington, Leshara, Wilson Island State Park,
Hitchcock Nature Center and Narrows River Park.

People attending Omaha Country Club should seek safe shelter
immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4125 9582 4126 9647 4157 9646 4148 9582
TIME...MOT...LOC 0517Z 318DEG 42KT 4136 9544 4136 9605 

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

Petersen

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 10:52 PM CDTSevere Thunderstorm WarningOAXMonona38 min
Jul 9, 11:02 PM CDTSevere Thunderstorm WarningOAXHarrison, Shelby29 min
Jul 9, 11:19 PM CDTSevere Thunderstorm WarningOAXHarrison, Monona41 min
Jul 9, 11:30 PM CDTSevere Thunderstorm WarningOAXHarrison, Mills, Montgomery, Pottawattamie, Shelby45 min
Jul 9, 11:55 PM CDTSevere Thunderstorm WarningOAXMills, Pottawattamie65 min
Jul 10, 12:13 AM CDTSevere Thunderstorm WarningOAXMills, Montgomery, Pottawattamie47 min
Jul 10, 12:26 AM CDTSevere Thunderstorm WarningOAXPottawattamie19 min
Jul 10, 12:40 AM CDTSevere Thunderstorm WarningOAXFremont, Mills, Montgomery, Page50 min
Jul 10, 12:42 AM CDTSevere Thunderstorm WarningOAXPottawattamie18 min
Jul 10, 12:44 AM CDTSevere Thunderstorm WarningOAXFremont61 min
Jul 10, 1:31 PM CDTSpecial Weather StatementOAXHarrison, Monona74 min
Jul 10, 1:56 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie64 min
Jul 10, 2:18 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie, Shelby42 min
Jul 9, 9:30 PM CDTSevere Thunderstorm WarningOAXAntelope, Knox, Pierce45 min
Jul 9, 9:50 PM CDTSpecial Weather StatementOAXAntelope, Boone10 min
Jul 9, 10:12 PM CDTSevere Thunderstorm WarningOAXAntelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more48 min
Jul 9, 10:15 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Platte45 min
Jul 9, 10:56 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Dodge, Platte, Saunders64 min
Jul 9, 11:00 PM CDTSevere Thunderstorm WarningOAXCuming, Madison, Pierce, Stanton, Wayne45 min
Jul 9, 11:26 PM CDTSevere Thunderstorm WarningOAXButler, Gage, Lancaster, Saline, Saunders, Seward64 min
Jul 9, 11:41 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Cuming, Dodge, Platte, Saunders and 1 more49 min
Jul 9, 11:46 PM CDTSevere Thunderstorm WarningOAXJefferson44 min
Jul 10, 12:11 AM CDTSevere Thunderstorm WarningOAXGage, Johnson, Pawnee49 min
Jul 10, 4:18 PM CDTSpecial Weather StatementOAXPawnee, Richardson27 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021Severe Thunderstorm Warnings in Iowa, 2021Every 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.