Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 261, NWS North Platte, NE

October 1, 2017Frontier County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Oct 1, 2017, 8:56 PM CDT for Frontier 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: Oct 1, 2017, 8:56 PM CDT (01:56 UTC)
Expired: Oct 1, 2017, 9:11 PM CDT
In force: 15 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Frontier County, NE

The radar

The Grand Island radar (KUEX), 141 km from the middle of the area, began a volume at 02:00 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 1, 3:25 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.9 hours before the alert went out and 81 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: 825 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1777 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted.

171 
WUUS53 KLBF 020156
SVRLBF
NEC063-020230-
/O.NEW.KLBF.SV.W.0261.171002T0156Z-171002T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
856 PM CDT SUN OCT 1 2017

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  East central Frontier County in southwestern Nebraska...

* Until 930 PM CDT

* At 855 PM CDT, a severe thunderstorm was located 9 miles south of
  Eustis, or 23 miles southwest of Lexington, moving northeast at 50
  mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* This severe thunderstorm will remain over mainly rural areas of
  east central Frontier County.

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.

&&

A tornado watch remains in effect until 1100 PM CDT for southwestern
Nebraska.

LAT...LON 4057 10018 4066 9998 4044 9998 4044 10009
      4043 10010
TIME...MOT...LOC 0155Z 246DEG 45KT 4053 10004 

HAIL...1.00IN
WIND...<50MPH
 
$$

Power

1 follow-up statement

766 
WWUS53 KLBF 020211
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
911 PM CDT SUN OCT 1 2017

NEC063-020221-
/O.CAN.KLBF.SV.W.0261.000000T0000Z-171002T0230Z/
Frontier NE-
911 PM CDT SUN OCT 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL FRONTIER COUNTY
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

LAT...LON 4057 10018 4066 9998 4044 9998 4044 10009
      4043 10010
TIME...MOT...LOC 0209Z 246DEG 45KT 4061 9980 

$$

Power

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 1, 7:15 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Garfield, Holt, Loup	45 min
Oct 1, 7:27 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes	14 min
Oct 1, 7:40 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Frontier, Lincoln	50 min
Oct 1, 7:43 PM CDT	Flash Flood Warning	LBF	Custer, Loup	6 hr
Oct 1, 7:56 PM CDT	Areal Flood Advisory	LBF	Frontier, Hayes, Lincoln	3 hr
Oct 1, 8:04 PM CDT	Areal Flood Advisory	LBF	Garfield, Holt, Loup	3 hr
Oct 1, 8:14 PM CDT	Severe Thunderstorm Warning	LBF	Holt	46 min
Oct 1, 8:28 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	32 min
Oct 2, 10:04 AM CDT	Flash Flood Watch	LBF	Custer, Frontier, Hayes, Lincoln, Logan	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.