Alert archive / Nebraska / Tornado Warnings in 2015

Tornado Warning 21, NWS Omaha, NE

September 7, 2015Nemaha County, Nebraska

NWS Omaha, NE issued this tornado warning at Sep 7, 2015, 10:14 PM CDT for Nemaha County, Nebraska. It was in force for 15 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 7, 2015, 10:14 PM CDT (03:14 UTC)
Expired: Sep 7, 2015, 10:29 PM CDT
In force: 15 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Nemaha County, NE

The radar

The Omaha radar (KOAX), 105 km from the middle of the area, began a volume at 03:14 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.2 hours before the alert went out and 106 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: 1737 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 792 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

802 
WFUS53 KOAX 080314
TOROAX
NEC127-080345-
/O.NEW.KOAX.TO.W.0021.150908T0314Z-150908T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1014 PM CDT MON SEP 7 2015

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL NEMAHA COUNTY IN SOUTHEASTERN NEBRASKA...

* UNTIL 1045 PM CDT
    
* AT 1013 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR JOHNSON...OR 33 MILES NORTHWEST OF FALLS
  CITY...MOVING EAST AT 25 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  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...
  JOHNSON AROUND 1025 PM CDT.

THIS INCLUDES HIGHWAY 136 IN NEBRASKA BETWEEN MILE MARKERS 217 AND
221.
 
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 4042 9607 4042 9606 4044 9598 4037 9597
      4036 9607
TIME...MOT...LOC 0313Z 260DEG 22KT 4038 9607 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MILLER

2 follow-up statements

865 
WWUS53 KOAX 080319
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1019 PM CDT MON SEP 7 2015

NEC127-080345-
/O.CON.KOAX.TO.W.0021.000000T0000Z-150908T0345Z/
NEMAHA NE-
1019 PM CDT MON SEP 7 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR WEST
CENTRAL NEMAHA COUNTY...
    
AT 1019 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR JOHNSON...OR 31 MILES NORTHWEST OF FALLS
CITY... MOVING EAST AT 15 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

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...
  JOHNSON AROUND 1025 PM CDT.

THIS INCLUDES HIGHWAY 136 IN NEBRASKA BETWEEN MILE MARKERS 217 AND
221.
 
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 4042 9607 4042 9606 4044 9598 4037 9597
      4036 9607
TIME...MOT...LOC 0319Z 268DEG 14KT 4038 9603 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MILLER

703 
WWUS53 KOAX 080329
SVSOAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1029 PM CDT MON SEP 7 2015

NEC127-080338-
/O.CAN.KOAX.TO.W.0021.000000T0000Z-150908T0345Z/
NEMAHA NE-
1029 PM CDT MON SEP 7 2015

...THE TORNADO WARNING FOR WEST CENTRAL NEMAHA COUNTY IS CANCELLED...
        
THE CIRCULATION WHICH PROMPTED THE TORNADO WARNING HAS WEAKENED AND
EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THIS AREA
UNTIL 1100 PM CDT. 

LAT...LON 4042 9607 4042 9606 4044 9598 4037 9597
      4036 9607
TIME...MOT...LOC 0327Z 260DEG 22KT 4039 9595 

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 7:12 PM CDT	Special Weather Statement	OAX	Saline	48 min
Sep 7, 7:45 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline	45 min
Sep 7, 8:22 PM CDT	Severe Thunderstorm Warning	OAX	Gage	53 min
Sep 7, 8:45 PM CDT	Special Weather Statement	OAX	Seward	45 min
Sep 7, 9:00 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Pawnee	45 min
Sep 7, 9:34 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Pawnee, Richardson	41 min
Sep 7, 9:50 PM CDT	Areal Flood Advisory	OAX	Johnson	4 hr
Sep 7, 10:09 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	51 min
Sep 7, 10:42 PM CDT	Areal Flood Advisory	OAX	Nemaha	4 hr
Sep 7, 10:45 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	30 min
Sep 7, 11:02 PM CDT	Special Weather Statement	OAX	Lancaster	43 min
Sep 7, 11:37 PM CDT	Special Weather Statement	OAX	Lancaster	38 min
Sep 7, 11:51 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	24 min
Sep 8, 12:22 AM CDT	Special Weather Statement	OAX	Cass, Lancaster, Otoe	38 min
Sep 8, 3:06 AM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Otoe	24 min
Sep 8, 3:33 AM CDT	Special Weather Statement	OAX	Burt, Colfax, Cuming, Dodge, Thurston	42 min
Sep 8, 7:51 AM CDT	River Flood Warning	OAX	Cass	18 hr

Nearby

Tornado Warnings in Nebraska, 2015 Every tornado warning in 2015 Tornadoes in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.