Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Omaha, NE

June 11, 2021Boone County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jun 11, 2021, 6:45 AM CDT for Boone County, Nebraska. It was in force for 30 min. 1 report 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
Jun 11, 2021, 6:45 AM CDT (11:45 UTC)
Expired
Jun 11, 2021, 7:15 AM CDT
In force
30 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Boone County, NE

The radar

The Omaha radar (KOAX), 156 km from the middle of the area, began a volume at 11:45 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
Jun 11, 6:46 AM CDTHAIL 17 W Loretto, 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
Jun 11, 5:36 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 11.8 hours before the alert went out and 155 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 2021-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1135 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 2021-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 square meters per square second.193958Sfc1 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
1135 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
2153 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

115 
WUUS53 KOAX 111145
SVROAX
NEC011-111215-
/O.NEW.KOAX.SV.W.0029.210611T1145Z-210611T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
645 AM CDT Fri Jun 11 2021

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Central Boone County in northeastern Nebraska...

* Until 715 AM CDT.

* At 645 AM CDT, a severe thunderstorm was located 9 miles southwest
  of Petersburg, or 40 miles east of Ord, moving east at 20 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.

* This severe thunderstorm will remain over mainly rural areas of
  central Boone County, including the following locations... Loretto.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4168 9823 4181 9824 4186 9803 4167 9802
TIME...MOT...LOC 1145Z 264DEG 15KT 4174 9817 

HAIL...1.00IN
WIND...60MPH
 
$$

Mead
2 follow-up statements
395 
WWUS53 KOAX 111156
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
656 AM CDT Fri Jun 11 2021

NEC011-111215-
/O.CON.KOAX.SV.W.0029.000000T0000Z-210611T1215Z/
Boone NE-
656 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR CENTRAL BOONE COUNTY...

At 656 AM CDT, a severe thunderstorm was located 6 miles northwest of
Albion, or 40 miles southwest of Norfolk, moving east at 15 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of
central Boone County, including the following locations... Loretto.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4168 9823 4181 9824 4186 9803 4167 9802
TIME...MOT...LOC 1156Z 264DEG 15KT 4175 9811 

HAIL...1.00IN
WIND...<50MPH
 
$$

Mead
961 
WWUS53 KOAX 111211
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
711 AM CDT Fri Jun 11 2021

NEC011-111221-
/O.EXP.KOAX.SV.W.0029.000000T0000Z-210611T1215Z/
Boone NE-
711 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BOONE COUNTY WILL
EXPIRE AT 715 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 AM CDT for
northeastern Nebraska.

LAT...LON 4168 9823 4181 9824 4186 9803 4167 9802
TIME...MOT...LOC 1211Z 264DEG 15KT 4176 9803 

$$

Mead

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 5:27 AM CDTSevere Thunderstorm WarningOAXKnox33 min
Jun 11, 5:55 AM CDTSevere Thunderstorm WarningOAXAntelope, Cedar, Knox, Pierce, Wayne35 min
Jun 11, 7:10 AM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Madison, Platte, Stanton, Thurston35 min
Jun 11, 7:24 AM CDTSevere Thunderstorm WarningOAXPlatte36 min
Jun 11, 7:34 AM CDTSevere Thunderstorm WarningOAXBurt, Cuming, Dodge, Thurston26 min
Jun 11, 7:41 AM CDTSevere Thunderstorm WarningOAXButler, Colfax, Madison, Platte, Stanton34 min
Jun 11, 7:50 AM CDTSevere Thunderstorm WarningOAXBurt, Washington40 min
Jun 11, 8:13 AM CDTSevere Thunderstorm WarningOAXButler, Colfax, Platte47 min
Jun 11, 8:55 AM CDTSpecial Weather StatementOAXCass, Douglas, Sarpy35 min
Jun 11, 9:00 AM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saunders, Seward30 min
Jun 11, 10:43 AM CDTAreal Flood AdvisoryOAXLancaster3 hr
Jun 11, 10:51 AM CDTSevere Thunderstorm WarningOAXJohnson, Nemaha, Otoe39 min
Jun 11, 11:26 AM CDTSevere Thunderstorm WarningOAXJohnson, Nemaha, Richardson49 min
Jun 11, 11:45 AM CDTSevere Thunderstorm WarningOAXPawnee, Richardson45 min
Jun 11, 12:11 PM CDTSevere Thunderstorm WarningOAXNemaha, Richardson34 min
Jun 11, 12:19 PM CDTSevere Thunderstorm WarningOAXPawnee, Richardson41 min
Jun 11, 12:25 PM CDTTornado WarningOAXRichardson16 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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.