Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 252, NWS Omaha, NE

October 2, 2017Platte County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Oct 2, 2017, 7:33 PM CDT for Platte County, Nebraska. It was in force for 27 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: Oct 2, 2017, 7:33 PM CDT (00:33 UTC)
Expired: Oct 2, 2017, 8:00 PM CDT
In force: 27 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Platte County, NE

The radar

The Omaha radar (KOAX), 106 km from the middle of the area, began a volume at 00:34 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
Oct 2, 7:41 PM CDT	HAIL 1.5	Monroe, 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, 0.6 hours before the alert went out and 105 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: 778 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1536 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 307 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

488 
WUUS53 KOAX 030033
SVROAX
NEC141-030100-
/O.NEW.KOAX.SV.W.0252.171003T0033Z-171003T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Omaha/Valley Nebraska
733 PM CDT MON OCT 2 2017

The National Weather Service in Omaha has issued a

* Severe Thunderstorm Warning for...
  Central Platte County in northeastern Nebraska...

* Until 800 PM CDT

* At 733 PM CDT, a severe thunderstorm was located near Genoa, or 17
  miles west of Columbus, moving northeast at 40 mph.

  HAZARD...Ping pong ball size hail. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles. 

* Locations impacted include...
  Platte Center, Monroe, Tarnov, Lake Ocaonee and Circle H Trailer
  Park.

This includes Highway 81 in Nebraska between mile markers 118 and
126.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4163 9764 4162 9741 4146 9744 4139 9759
      4139 9770 4152 9770 4153 9773
TIME...MOT...LOC 0033Z 226DEG 33KT 4143 9768 

HAIL...1.50IN
WIND...<50MPH
 
$$

MAYES

2 follow-up statements

286 
WWUS53 KOAX 030039
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
739 PM CDT MON OCT 2 2017

NEC141-030100-
/O.CON.KOAX.SV.W.0252.000000T0000Z-171003T0100Z/
Platte NE-
739 PM CDT MON OCT 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR CENTRAL PLATTE COUNTY...

At 739 PM CDT, a severe thunderstorm was located over Monroe, or 14
miles west of Columbus, moving northeast at 40 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Platte Center, Monroe, Tarnov, Lake Ocaonee and Circle H Trailer
Park.

This includes Highway 81 in Nebraska between mile markers 118 and
126.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4163 9764 4162 9741 4146 9744 4139 9759
      4139 9770 4152 9770 4153 9773
TIME...MOT...LOC 0039Z 226DEG 33KT 4147 9763 

HAIL...1.75IN
WIND...60MPH
 
$$

MAYES

191 
WWUS53 KOAX 030046 CCA
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
746 PM CDT MON OCT 2 2017

NEC141-030100-
/O.COR.KOAX.SV.W.0252.000000T0000Z-171003T0100Z/
Platte NE-
746 PM CDT MON OCT 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR CENTRAL PLATTE COUNTY...

At 745 PM CDT, a severe thunderstorm was located near Platte Center,
or 11 miles northwest of Columbus, moving northeast at 40 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

SOURCE...Law enforcement. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Platte Center, Monroe, Tarnov, Lake Ocaonee and Circle H Trailer
Park.

This includes Highway 81 in Nebraska between mile markers 118 and
126.

Fire department officials reported ping pong ball size hail near 
Monroe at 741 pm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4163 9764 4162 9741 4146 9744 4139 9759
      4139 9770 4152 9770 4153 9773
TIME...MOT...LOC 0039Z 226DEG 34KT 4147 9763 

HAIL...1.50IN
WIND...60MPH
 
$$

MAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 2, 7:30 PM CDT	Special Weather Statement	OAX	Platte	45 min
Oct 2, 7:54 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Madison, Platte, Stanton	36 min
Oct 2, 8:21 PM CDT	Special Weather Statement	OAX	Platte, Stanton	39 min
Oct 2, 8:27 PM CDT	Special Weather Statement	OAX	Cuming	48 min
Oct 2, 9:38 PM CDT	Special Weather Statement	OAX	Knox	52 min
Oct 2, 11:22 PM CDT	Special Weather Statement	OAX	Antelope, Boone, Madison, Pierce, Platte	38 min

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.