Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Omaha, NE

April 9, 20175 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 9, 2017, 9:11 PM CDT for 5 counties in Nebraska. It was in force for 49 min. 2 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 9, 2017, 9:11 PM CDT (02:11 UTC)
Expired: Apr 9, 2017, 10:00 PM CDT
In force: 49 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 86 km from the middle of the area, began a volume at 02:14 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.

What was reported inside it

Time	Report	Where	Remark
Apr 9, 9:17 PM CDT	HAIL 1	Panama, NE	FROM SOCIAL MEDIA.
Apr 9, 9:55 PM CDT	HAIL 0.75	Cook, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.2 hours before the alert went out and 86 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: 863 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 1606 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 265 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted.

333 
WUUS53 KOAX 100211
SVROAX
NEC067-097-109-127-131-100300-
/O.NEW.KOAX.SV.W.0021.170410T0211Z-170410T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
911 PM CDT SUN APR 9 2017

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Southeastern Lancaster County in southeastern Nebraska...
  Northern Johnson County in southeastern Nebraska...
  Northwestern Nemaha County in southeastern Nebraska...
  Otoe County in southeastern Nebraska...
  Northeastern Gage County in southeastern Nebraska...

* Until 1000 PM CDT

* At 910 PM CDT, a severe thunderstorm was located over Panama, or 17
  miles southeast of Lincoln, moving east at 45 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. 

* Locations impacted include...
  Nebraska City, Syracuse, Bennet, Palmyra, Cook, Unadilla, Panama,
  Talmage, Douglas, Lorton, Dunbar, Otoe, Julian, Burr, Camp Catron
  and Wagon Train State Recreation Area.

This includes the following highways...
 Highway 2 IN Nebraska between mile markers 472 and 507.
 Highway 75 IN Nebraska between mile markers 37 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4070 9661 4077 9593 4058 9576 4058 9578
      4056 9576 4053 9577 4052 9574 4051 9573
      4051 9654
TIME...MOT...LOC 0210Z 257DEG 42KT 4062 9648 

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

KERN

2 follow-up statements

934 
WWUS53 KOAX 100241
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
941 PM CDT SUN APR 9 2017

NEC067-109-100251-
/O.CAN.KOAX.SV.W.0021.000000T0000Z-170410T0300Z/
Lancaster NE-Gage NE-
941 PM CDT SUN APR 9 2017

...The SEVERE THUNDERSTORM Warning for SOUTHEASTERN LANCASTER AND
NORTHEASTERN GAGE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4071 9644 4077 9593 4058 9576 4058 9578
      4056 9576 4053 9577 4052 9574 4051 9573
      4051 9646
TIME...MOT...LOC 0241Z 257DEG 42KT 4070 9601 

$$

NEC097-127-131-100300-
/O.CON.KOAX.SV.W.0021.000000T0000Z-170410T0300Z/
Johnson NE-Nemaha NE-Otoe NE-
941 PM CDT SUN APR 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR NORTHERN JOHNSON...NORTHWESTERN NEMAHA AND OTOE COUNTIES...

At 941 PM CDT, a severe thunderstorm was located 7 miles north of
Lorton, or 36 miles east of Lincoln, moving east at 50 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. 

Locations impacted include...
Nebraska City, Syracuse, Palmyra, Cook, Unadilla, Talmage, Douglas,
Lorton, Dunbar, Otoe, Julian, Burr and Camp Catron.

This includes the following highways...
 Highway 2 IN Nebraska between mile markers 475 and 507.
 Highway 75 IN Nebraska between mile markers 37 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4071 9644 4077 9593 4058 9576 4058 9578
      4056 9576 4053 9577 4052 9574 4051 9573
      4051 9646
TIME...MOT...LOC 0241Z 257DEG 42KT 4070 9601 

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

KERN

094 
WWUS53 KOAX 100256
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
956 PM CDT SUN APR 9 2017

NEC097-127-131-100306-
/O.EXP.KOAX.SV.W.0021.000000T0000Z-170410T0300Z/
Johnson NE-Nemaha NE-Otoe NE-
956 PM CDT SUN APR 9 2017

...The SEVERE THUNDERSTORM Warning for NORTHERN JOHNSON...
NORTHWESTERN NEMAHA AND OTOE COUNTIES WILL EXPIRE AT 1000 PM 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
is still possible with this thunderstorm.

LAT...LON 4071 9644 4077 9593 4058 9576 4058 9578
      4056 9576 4053 9577 4052 9574 4051 9573
      4051 9646
TIME...MOT...LOC 0256Z 257DEG 42KT 4074 9579 

$$

KERN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 8:14 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	46 min
Apr 9, 8:26 PM CDT	Special Weather Statement	OAX	Butler, Saunders	34 min
Apr 9, 8:44 PM CDT	Special Weather Statement	OAX	Lancaster	46 min
Apr 9, 8:52 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Lancaster, Saline	38 min
Apr 9, 9:24 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Otoe, Pawnee	33 min
Apr 9, 9:47 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	43 min
Apr 9, 10:02 PM CDT	Special Weather Statement	OAX	Pawnee	43 min
Apr 9, 10:18 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Pawnee, Richardson	42 min
Apr 9, 10:26 PM CDT	Special Weather Statement	OAX	Pawnee	49 min
Apr 9, 10:30 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Nemaha, Pawnee, Richardson	45 min
Apr 9, 11:01 PM CDT	Special Weather Statement	OAX	Nemaha	29 min
Apr 9, 11:17 PM CDT	Special Weather Statement	OAX	Nemaha	43 min
Apr 9, 11:36 PM CDT	Special Weather Statement	OAX	Nemaha, Richardson	24 min
Apr 9, 11:39 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	36 min
Apr 10, 12:16 AM CDT	Severe Thunderstorm Warning	OAX	Richardson	29 min
Apr 10, 3:28 PM CDT	Freeze Warning	OAX	Butler, Gage, Jefferson, Lancaster, Saline, Seward	17 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2017 Every severe thunderstorm warning in 2017

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.