Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS Omaha, NE

April 14, 20124 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 14, 2012, 11:52 PM CDT for 4 counties in Nebraska. It was in force for 38 min. 4 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: Apr 14, 2012, 11:52 PM CDT (04:52 UTC)
Expired: Apr 15, 2012, 12:30 AM CDT
In force: 38 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Cass County, NE, Lancaster County, NE, Sarpy County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 37 km from the middle of the area, began a volume at 04:53 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
Apr 15, 12:08 AM CDT	HAIL 0.75	4 Sw Waverly, NE
Apr 15, 12:18 AM CDT	TORNADO	1 Ne South Bend, NE	NWS STORM SURVEY CONFIRMED AN EF1 TORNADO STARTING 1 MILE NORTHEAST OF SOUTH BEND...AND LIFTING AT 1121 PM 2 MILES NORTH-NORTHWEST OF SOUTH BEND IN CASS COUNTY ACROSS THE PLATTE RIVER.
Apr 15, 12:18 AM CDT	TORNADO	1 Nw South Bend, NE	NWS STORM SURVEY CONFIRMED AN EF1 TORNADO STARTING 1 MILE NORTHEAST OF SOUTH BEND...AND LIFTING AT 1212 AM 2 MILES NORTH-NORTHEAST OF SOUTH BEND IN CASS COUNTY ACROSS THE PLATTE RIVER.
Apr 15, 12:25 AM CDT	TSTM WND GST 70	S South Bend, 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.

Issued	Product	Office	Lasted
Apr 14, 6:27 PM CDT	Tornado Watch PDS	SPC	9 hr
Apr 14, 10:09 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.9 hours before the alert went out and 37 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 483 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

073 
WUUS53 KOAX 150452
SVROAX
NEC025-109-153-155-150530-
/O.NEW.KOAX.SV.W.0049.120415T0452Z-120415T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1152 PM CDT SAT APR 14 2012

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASS COUNTY IN EASTERN NEBRASKA...
  NORTHEASTERN LANCASTER COUNTY IN SOUTHEASTERN NEBRASKA...
  SARPY COUNTY IN EASTERN NEBRASKA...
  EXTREME SOUTHEASTERN SAUNDERS COUNTY IN EASTERN NEBRASKA...

* UNTIL 1230 AM CDT

* AT 1148 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL UP 
  TO PING PONG BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH. 
  THIS STORM WAS LOCATED NEAR WAVERLY...OR 8 MILES NORTHEAST OF 
  LINCOLN...AND MOVING EAST AT 55 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  WAVERLY...GRETNA...ASHLAND...SPRINGFIELD...LOUISVILLE...
  GREENWOOD...CEDAR CREEK...MURDOCK...CERESCO...MANLEY...DAVEY...
  ALVO...
  MEMPHIS AND SOUTH BEND. 

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 HIGHWAY 77 BETWEEN MILE MARKERS 77 AND 82.
 INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 405 AND 440.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. ALTHOUGH 
NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND 
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT SUNDAY MORNING 
FOR SOUTHWESTERN IOWA AND SOUTHEASTERN NEBRASKA.

LAT...LON 4091 9598 4083 9665 4105 9670 4119 9621
      4113 9594
TIME...MOT...LOC 0448Z 250DEG 49KT 4093 9662 
WIND...HAIL 60MPH 1.50IN

$$

MAYES

3 follow-up statements

779 
WWUS53 KOAX 150509
SVSOAX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1209 AM CDT SUN APR 15 2012

NEC025-109-153-155-150530-
/O.CON.KOAX.SV.W.0049.000000T0000Z-120415T0530Z/
CASS NE-SAUNDERS NE-SARPY NE-LANCASTER NE-
1209 AM CDT SUN APR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM 
CDT FOR CASS...SOUTHEASTERN SAUNDERS...SARPY AND NORTHEASTERN 
LANCASTER COUNTIES...

AT 1207 AM CDT...NATIONAL WEATHER SERVICE METEROLOGISTS INDICATED 
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND 
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR 
ASHLAND...OR 22 MILES SOUTHWEST OF OMAHA...MOVING EAST AT 55 MPH. 

LOCATIONS IMPACTED INCLUDE...
WAVERLY...GRETNA...ASHLAND...SPRINGFIELD...LOUISVILLE...GREENWOOD...
CEDAR CREEK...MURDOCK...MANLEY...ALVO...MEMPHIS AND SOUTH BEND. 

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 409 
AND 440.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. ALTHOUGH 
NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND 
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MILES 
PER HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY 
RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST 
FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO 
DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4091 9598 4083 9663 4089 9662 4111 9651
      4119 9621 4113 9594
TIME...MOT...LOC 0507Z 250DEG 49KT 4102 9630 
WIND...HAIL 60MPH 1.00IN

$$

MAYES

417 
WWUS53 KOAX 150520
SVSOAX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1220 AM CDT SUN APR 15 2012

NEC109-155-150540-
/O.CAN.KOAX.SV.W.0049.000000T0000Z-120415T0530Z/
SAUNDERS NE-LANCASTER NE-
1220 AM CDT SUN APR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SAUNDERS AND 
NORTHEASTERN LANCASTER COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED. 

LAT...LON 4091 9598 4088 9628 4095 9632 4117 9630
      4119 9621 4113 9594
TIME...MOT...LOC 0520Z 253DEG 42KT 4117 9625 4089 9624 

$$

NEC025-153-150530-
/O.CON.KOAX.SV.W.0049.000000T0000Z-120415T0530Z/
CASS NE-SARPY NE-
1220 AM CDT SUN APR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM 
CDT FOR CASS AND SARPY COUNTIES...

AT 1217 AM CDT...NATIONAL WEATHER SERVICE METEROLOGISTS INDICATED 
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL AND DAMAGING WINDS IN EXCESS OF 65 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM 17 MILES SOUTH OF GRETNA TO 
MURDOCK...OR ALONG A LINE EXTENDING FROM 28 MILES SOUTHWEST OF 
OMAHA TO 66 MILES NORTHWEST OF FALLS CITY...MOVING EAST AT 50 MPH. 

LOCATIONS IMPACTED INCLUDE...
GRETNA...SPRINGFIELD...LOUISVILLE...CEDAR CREEK...MURDOCK...MANLEY 
AND SOUTH BEND. 

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 426 
AND 440.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. ALTHOUGH 
NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND 
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 4091 9598 4088 9628 4095 9632 4117 9630
      4119 9621 4113 9594
TIME...MOT...LOC 0517Z 253DEG 42KT 4117 9625 4089 9624 
WIND...HAIL 65MPH 1.00IN

$$

BOUSTEAD

116 
WWUS53 KOAX 150529
SVSOAX
SEVERE WEATHER STATEMENTNATIONAL WEATHER SERVICE OMAHA/VALLEY 
NEBRASKA1229 AM CDT SUN APR 15 2012

NEC153-025-150540-
/O.EXP.KOAX.SV.W.0049.000000T0000Z-120415T0530Z/
CASS NE-SARPY NE-
1229 AM CDT SUN APR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR CASS AND SARPY COUNTIES 
WILL EXPIRE AT 1230 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF 
THE AREA. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE. A SEVERE 
THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR SARPY AND CASS 
COUNTIES UNTIL 100 AM.

ADDITIONAL SEVERE THUNDERSTORM DEVELOPMENT REMAINS POSSIBLE...AND 
A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM.


LAT...LON 4091 9598 4088 9628 4095 9632 4117 9630
      4119 9621 4113 9594
TIME...MOT...LOC 0528Z 250DEG 49KT 4117 9625 4089 9624 

$$

MAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 7:02 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy	58 min
Apr 14, 9:17 PM CDT	Wind Advisory	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more	31 hr
Apr 14, 9:25 PM CDT	Special Weather Statement	OAX	Platte	35 min
Apr 14, 9:49 PM CDT	Severe Thunderstorm Warning	OAX	Cedar, Pierce, Wayne	26 min
Apr 14, 10:51 PM CDT	Special Weather Statement	OAX	Cedar, Pierce	24 min
Apr 14, 11:01 PM CDT	Severe Thunderstorm Warning	OAX	Saline, Seward	29 min
Apr 14, 11:26 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Seward	34 min
Apr 14, 11:31 PM CDT	Tornado Warning	OAX	Lancaster, Seward	29 min
Apr 15, 12:09 AM CDT	Special Weather Statement	OAX	Nemaha, Richardson	36 min
Apr 15, 12:12 AM CDT	Special Weather Statement	OAX	Douglas	33 min
Apr 15, 12:28 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy	21 min
Apr 15, 12:41 AM CDT	Severe Thunderstorm Warning	OAX	Douglas, Sarpy	34 min
Apr 15, 2:05 AM CDT	Special Weather Statement	OAX	Johnson, Nemaha, Otoe, Pawnee, Richardson	85 min
Apr 15, 10:23 AM CDT	River Flood Warning	OAX	Nemaha	11 hr
Apr 15, 10:23 AM CDT	River Flood Warning	OAX	Richardson	21 hr
Apr 15, 1:53 PM CDT	Special Weather Statement	OAX	Knox	67 min
Apr 15, 2:06 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Knox	54 min
Apr 15, 2:11 PM CDT	Tornado Warning	OAX	Knox	49 min
Apr 15, 2:30 PM CDT	Tornado Warning	OAX	Knox	39 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012 Every severe thunderstorm warning in 2012

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.