Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 5, NWS Omaha, NE

April 15, 2017Richardson County, Nebraska

NWS Omaha, NE issued this tornado warning at Apr 15, 2017, 8:21 PM CDT for Richardson County, Nebraska. It was in force for 24 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: Apr 15, 2017, 8:21 PM CDT (01:21 UTC)
Expired: Apr 15, 2017, 8:45 PM CDT
In force: 24 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Richardson County, NE

The radar

The Topeka radar (KTWX), 131 km from the middle of the area, began a volume at 01:21 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, 8:33 PM CDT	HAIL 1.25	Dawson, 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 15, 5:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KFOE), launched 00:00Z, 1.4 hours before the alert went out and 127 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: 1238 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1567 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 8.5

Open this sounding in Storm Lab

The text

As transmitted.

612 
WFUS53 KOAX 160121
TOROAX
NEC147-160145-
/O.NEW.KOAX.TO.W.0005.170416T0121Z-170416T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service OMAHA/VALLEY NEBRASKA
821 PM CDT SAT APR 15 2017

The National Weather Service in OMAHA has issued a

* Tornado Warning for...
  Central Richardson County in southeastern Nebraska...

* Until 845 PM CDT
    
* At 821 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 5 miles southwest of Stella, or 13 miles northwest of
  Falls City, moving south at 10 mph.

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

  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 tornadic thunderstorm will remain over mainly rural areas of
  central Richardson County, including the following locations:
  Dawson.

This includes Highway 75 IN Nebraska between mile markers 7 and 10.
 
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 4017 9585 4019 9580 4007 9575 4007 9584
TIME...MOT...LOC 0121Z 343DEG 9KT 4016 9582 

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

$$

BOUSTEAD

2 follow-up statements

880 
WWUS53 KOAX 160131
SVSOAX

Severe Weather Statement
National Weather Service OMAHA/VALLEY NEBRASKA
831 PM CDT SAT APR 15 2017

NEC147-160145-
/O.CON.KOAX.TO.W.0005.000000T0000Z-170416T0145Z/
Richardson NE-
831 PM CDT SAT APR 15 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR CENTRAL
RICHARDSON COUNTY...
    
At 830 PM CDT, a severe thunderstorm capable of producing a tornado
was located 5 miles west of Verdon, or 11 miles west of Falls City,
moving south at 10 mph.

HAZARD...Tornado and two inch hail. 

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. 

Locations impacted include...
Dawson.

This includes Highway 75 IN Nebraska between mile markers 7 and 10.
 
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 4014 9585 4015 9578 4007 9575 4007 9584
TIME...MOT...LOC 0130Z 342DEG 10KT 4012 9580 

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

$$

BOUSTEAD

853 
WWUS53 KOAX 160142
SVSOAX

Severe Weather Statement
National Weather Service OMAHA/VALLEY NEBRASKA
842 PM CDT SAT APR 15 2017

NEC147-160151-
/O.EXP.KOAX.TO.W.0005.000000T0000Z-170416T0145Z/
Richardson NE-
842 PM CDT SAT APR 15 2017

...The TORNADO Warning for WEST CENTRAL RICHARDSON COUNTY WILL EXPIRE
AT 845 PM CDT...
    
The tornadic thunderstorm which prompted the warning has weakened 
and no longer appears capable of producing a tornado. Therefore, the 
warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 1100 PM CDT for
southeastern Nebraska.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Richardson County until 9 pm CDT for hail up to 2 inches in 
diameter. 

LAT...LON 4014 9585 4015 9578 4007 9575 4007 9584
TIME...MOT...LOC 0141Z 343DEG 9KT 4010 9579 

$$

BOUSTEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 7:07 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	23 min
Apr 15, 7:26 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Dodge	34 min
Apr 15, 7:40 PM CDT	Special Weather Statement	OAX	Nemaha	35 min
Apr 15, 7:44 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Dodge, Washington	46 min
Apr 15, 7:59 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	31 min
Apr 15, 8:12 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Dodge, Washington	33 min
Apr 15, 8:29 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	31 min
Apr 15, 8:56 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	34 min

Nearby

Tornado Warnings in Nebraska, 2017 Every tornado warning in 2017 Tornadoes 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.