Alert archive / Nebraska / Tornado Warnings in 2018

Tornado Warning 21, NWS Omaha, NE

June 11, 2018Cass County, Nebraska

NWS Omaha, NE issued this tornado warning at Jun 11, 2018, 6:26 PM CDT for Cass County, Nebraska. It was in force for 49 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, 2018, 6:26 PM CDT (23:26 UTC)
Expired: Jun 11, 2018, 7:15 PM CDT
In force: 49 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Cass County, NE

The radar

The Omaha radar (KOAX), 54 km from the middle of the area, began a volume at 23:25 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
Jun 11, 6:30 PM CDT	TORNADO	6 Nw Murray, NE	INTERMITTENTLY TOUCHING TOWN. HARD TO DISCERN IN RAIN.

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
Jun 11, 3:42 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.4 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: 1072 J/kg
Mixed-layer CIN: -356 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 312 m²/s²
0-3 km storm-relative helicity: 463 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

As transmitted.

359 
WFUS53 KOAX 112326
TOROAX
NEC025-120015-
/O.NEW.KOAX.TO.W.0021.180611T2326Z-180612T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Omaha/Valley Nebraska
626 PM CDT MON JUN 11 2018

The National Weather Service in Omaha has issued a

* Tornado Warning for...
  Northeastern Cass County in southeastern Nebraska...

* Until 715 PM CDT.
    
* At 625 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 5 miles northwest of Murray, or 20 miles south of
  Omaha, moving east at 20 mph.

  HAZARD...Tornado and hail up to two inches in diameter.

  SOURCE...Trained spotters.  Several reports of rotating wall 
           clouds east of Louisville.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Murray around 640 PM CDT.
  Plattsmouth around 645 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4088 9586 4092 9611 4102 9609 4102 9587
      4100 9587 4099 9585
TIME...MOT...LOC 2325Z 277DEG 17KT 4097 9602 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

ZAPOTOCNY

2 follow-up statements

050 
WWUS53 KOAX 112338
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
638 PM CDT MON JUN 11 2018

NEC025-120015-
/O.CON.KOAX.TO.W.0021.000000T0000Z-180612T0015Z/
Cass NE-
638 PM CDT MON JUN 11 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHEASTERN CASS COUNTY...
        
At 637 PM CDT, a confirmed tornado was located near Murray, or 22
miles south of Omaha, moving east at 20 mph.

HAZARD...Damaging tornado and two inch hail.

SOURCE...Radar confirmed tornado 4 mi. east southeast of Louisville 
         at 625pm.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornado will be near...
  Murray around 645 PM CDT.
  Plattsmouth around 650 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4088 9586 4092 9611 4102 9609 4102 9587
      4100 9587 4099 9585
TIME...MOT...LOC 2337Z 277DEG 19KT 4094 9598 

TORNADO...OBSERVED
HAIL...2.00IN

$$

ZAPOTOCNY

188 
WWUS53 KOAX 112355
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
655 PM CDT MON JUN 11 2018

NEC025-120015-
/O.CON.KOAX.TO.W.0021.000000T0000Z-180612T0015Z/
Cass NE-
655 PM CDT MON JUN 11 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR EAST
CENTRAL CASS COUNTY...
    
At 654 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Murray, or 23 miles south of Omaha, moving east at
15 mph.

HAZARD...Tornado and two inch hail.

SOURCE...Storm had produced a tornado and rotation is still 
         indicated by radar.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
east central Cass County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4091 9606 4099 9601 4102 9587 4100 9587
      4099 9585 4088 9586
TIME...MOT...LOC 2354Z 286DEG 15KT 4093 9591 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

ZAPOTOCNY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 4:31 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Cuming, Dodge	44 min
Jun 11, 4:36 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston	39 min
Jun 11, 4:50 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	40 min
Jun 11, 5:08 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Dodge, Washington	52 min
Jun 11, 5:15 PM CDT	Tornado Warning	OAX	Dodge, Saunders	30 min
Jun 11, 5:24 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	51 min
Jun 11, 5:28 PM CDT	Tornado Warning	OAX	Cass, Sarpy	32 min
Jun 11, 5:32 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Saunders, Washington	43 min
Jun 11, 5:44 PM CDT	Areal Flood Advisory	OAX	Sarpy	3 hr
Jun 11, 6:00 PM CDT	Tornado Warning	OAX	Cass	30 min
Jun 11, 6:13 PM CDT	Areal Flood Advisory	OAX	Cass, Sarpy	3 hr
Jun 11, 6:13 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy, Saunders	62 min
Jun 11, 6:31 PM CDT	Flash Flood Warning	OAX	Cass, Sarpy	113 min
Jun 11, 6:35 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Gage, Johnson, Lancaster, Nemaha, Otoe	55 min
Jun 11, 6:40 PM CDT	Tornado Warning	OAX	Cass, Otoe	23 min
Jun 11, 6:58 PM CDT	Tornado Warning	OAX	Otoe	32 min

Nearby

Tornado Warnings in Nebraska, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.