Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 159, NWS North Platte, NE

August 1, 2012Arthur County, Grant County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 1, 2012, 4:03 PM MDT for Arthur County, Grant County, Nebraska. It was in force for 42 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: Aug 1, 2012, 4:03 PM MDT (22:03 UTC)
Expired: Aug 1, 2012, 4:45 PM MDT
In force: 42 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Arthur County, NE, Grant County, NE

The radar

The North Platte radar (KLNX), 93 km from the middle of the area, began a volume at 22:06 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.

What was reported inside it

Time	Report	Where	Remark
Aug 1, 4:17 PM MDT	HAIL 0.88	6 Nnw Arthur, NE
Aug 1, 4:25 PM MDT	HAIL 0.75	4 N Arthur, NE	HAIL COVERED THE GROUND AND A TOTAL OF 0.90 INCHES FELL.

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
Aug 1, 2:19 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.1 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: 756 J/kg
Mixed-layer CIN: -301 J/kg
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

301 
WUUS53 KLBF 012203
SVRLBF
NEC005-075-012245-
/O.NEW.KLBF.SV.W.0159.120801T2203Z-120801T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
403 PM MDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ARTHUR COUNTY IN WEST CENTRAL NEBRASKA...
  SOUTH CENTRAL GRANT COUNTY IN WEST CENTRAL NEBRASKA...

* UNTIL 445 PM MDT

* AT 357 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND   
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
  JENSEN LAKE...OR 8 MILES NORTHWEST OF ARTHUR...AND MOVING          
  NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SAND PUDDIN LAKE AROUND 435 PM MDT.
  GREEN LAKE AROUND 445 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE HIGHWAY
61 MILE MARKER 130.

LAT...LON 4187 10156 4161 10140 4151 10141 4151 10192
      4169 10195
TIME...MOT...LOC 2202Z 247DEG 14KT 4164 10180
WIND...HAIL 60MPH 1.00IN

$$

TAYLOR

2 follow-up statements

253 
WWUS53 KLBF 012220
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
520 PM CDT WED AUG 1 2012

NEC005-075-012245-
/O.CON.KLBF.SV.W.0159.000000T0000Z-120801T2245Z/
GRANT NE-ARTHUR NE-
420 PM MDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
ARTHUR AND SOUTH CENTRAL GRANT COUNTIES UNTIL 445 PM MDT...

AT 420 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM SAND PUDDIN LAKE TO HAYTHORN 
LAKE...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  GREEN LAKE AND ARTHUR AROUND 430 PM MDT.
  THREE MILE LAKE AROUND 445 PM MDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE HIGHWAY 61
MILE MARKER 120 AND HIGHWAY 92 MILE MARKER 170.

LAT...LON 4187 10156 4161 10140 4151 10141 4151 10192
      4169 10195
TIME...MOT...LOC 2221Z 266DEG 15KT 4169 10162 4155 10177
WIND...HAIL 60MPH 1.00IN

$$

TAYLOR

010 
WWUS53 KLBF 012248
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
548 PM CDT WED AUG 1 2012

NEC005-075-012258-
/O.EXP.KLBF.SV.W.0159.000000T0000Z-120801T2245Z/
GRANT NE-ARTHUR NE-
448 PM MDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ARTHUR AND SOUTH
CENTRAL GRANT COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL 
POSSIBLE WITH THESE THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT.

LAT...LON 4187 10156 4161 10140 4151 10141 4151 10192
      4169 10195
TIME...MOT...LOC 2220Z 266DEG 15KT 4169 10162 4155 10177

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 2:19 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	56 min
Aug 1, 2:23 PM MDT	Severe Thunderstorm Warning	LBF	Garden	52 min
Aug 1, 3:15 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	44 min
Aug 1, 5:00 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha	60 min
Aug 1, 5:10 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, Lincoln, McPherson	50 min
Aug 1, 5:44 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha, Rock	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012 Every severe thunderstorm warning in 2012

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.