Alert archive / Nebraska / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 13, NWS North Platte, NE

April 29, 2009Arthur County, Keith County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Apr 29, 2009, 9:07 PM MDT for Arthur County, Keith County, Nebraska. It was in force for 23 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: Apr 29, 2009, 9:07 PM MDT (03:07 UTC)
Expired: Apr 29, 2009, 9:30 PM MDT
In force: 23 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

Counties Arthur County, NE, Keith County, NE

The radar

The North Platte radar (KLNX), 98 km from the middle of the area, began a volume at 03:06 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 3.1 hours before the alert went out and 77 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: 2422 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1313 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLBF 300307
SVRLBF
NEC005-101-300330-
/O.NEW.KLBF.SV.W.0013.090430T0307Z-090430T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
907 PM MDT WED APR 29 2009

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN KEITH COUNTY IN SOUTHWEST NEBRASKA...
  SOUTHEASTERN ARTHUR COUNTY IN WEST CENTRAL NEBRASKA...

* UNTIL 930 PM MDT

* AT 902 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 6 MILES NORTHWEST OF
  KEYSTONE...OR 10 MILES NORTH OF OGALLALA...AND MOVING NORTHEAST AT
  20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHERN KEITH COUNTY AT 920 PM MDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4150 10140 4140 10140 4139 10137 4139 10135
      4119 10127 4116 10173 4143 10175
TIME...MOT...LOC 0306Z 238DEG 16KT 4128 10166

$$

TAYLOR

1 follow-up statement

000 
WWUS53 KLBF 300320
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
920 PM MDT WED APR 29 2009

NEC005-101-300330-
/O.CON.KLBF.SV.W.0013.000000T0000Z-090430T0330Z/
ARTHUR NE-KEITH NE-
920 PM MDT WED APR 29 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM MDT
FOR NORTH CENTRAL KEITH AND SOUTHEASTERN ARTHUR COUNTIES...

AT 917 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED OVER NORTH CENTRAL KEITH COUNTY...OR 15
MILES NORTH OF OGALLALA...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHERN KEITH COUNTY AT 930 PM MDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4143 10175 4150 10140 4140 10140 4139 10135
      4130 10133 4126 10165
TIME...MOT...LOC 0320Z 243DEG 21KT 4134 10159

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:20 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Cherry	55 min
Apr 29, 9:04 PM MDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Thomas	56 min
Apr 29, 9:17 PM MDT	Severe Thunderstorm Warning	LBF	Keith	43 min
Apr 29, 9:30 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, McPherson	45 min
Apr 29, 10:45 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	45 min
Apr 29, 11:42 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Hayes	63 min
Apr 29, 11:59 PM MDT	Areal Flood Advisory	LBF	Chase	6 hr
Apr 30, 6:20 AM MDT	Areal Flood Warning	LBF	Hayes	5 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2009 Every severe thunderstorm warning in 2009

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.