Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 87, NWS North Platte, NE

May 19, 2012McPherson County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 19, 2012, 8:52 AM CDT for McPherson County, Nebraska. It was in force for 38 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: May 19, 2012, 8:52 AM CDT (13:52 UTC)
Expired: May 19, 2012, 9:30 AM CDT
In force: 38 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County McPherson County, NE

The radar

The North Platte radar (KLNX), 69 km from the middle of the area, began a volume at 13:52 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
May 19, 9:26 AM CDT	HAIL 1	7 N Tryon, NE	GROUND COVERED WITH HAIL. THE LARGEST SIZE IF HAIL WAS A QUARTER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 1.9 hours before the alert went out and 70 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: 177 J/kg
Mixed-layer CIN: -495 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 423 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

016 
WUUS53 KLBF 191352
SVRLBF
NEC117-191430-
/O.NEW.KLBF.SV.W.0087.120519T1352Z-120519T1430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
852 AM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MCPHERSON COUNTY IN WEST CENTRAL NEBRASKA...

* UNTIL 930 AM CDT

* AT 848 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.      
  THIS STORM WAS LOCATED NEAR DIAMOND BAR LAKE...OR 17 MILES WEST    
  OF TRYON...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF MCPHERSON
  COUNTY...INCLUDING THE FOLLOWING LOCATIONS HIGHWAY 97 MILE MARKER
  40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4174 10123 4174 10074 4139 10117 4139 10133
      4144 10141 4147 10141
TIME...MOT...LOC 1352Z 219DEG 34KT 4149 10122
WIND...HAIL <50MPH 1.00IN

$$

TAYLOR

1 follow-up statement

887 
WWUS53 KLBF 191413
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
913 AM CDT SAT MAY 19 2012

NEC117-191430-
/O.CON.KLBF.SV.W.0087.000000T0000Z-120519T1430Z/
MCPHERSON NE-
913 AM CDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MCPHERSON
COUNTY UNTIL 930 AM CDT...

AT 911 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS 
STORM WAS LOCATED 4 MILES WEST OF TRYON...AND MOVING NORTHEAST AT 35 
MPH.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF MCPHERSON
COUNTY...INCLUDING THE FOLLOWING LOCATIONS HIGHWAY 97 MILE MARKER 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4147 10107 4149 10119 4153 10125 4156 10129
      4174 10123 4174 10074
TIME...MOT...LOC 1412Z 236DEG 32KT 4157 10102
WIND...HAIL <50MPH 1.00IN

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 8:25 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Grant	50 min
May 19, 9:32 AM CDT	Severe Thunderstorm Warning	LBF	Hooker, Logan, McPherson, Thomas	43 min
May 19, 1:16 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Frontier, Hayes	44 min
May 19, 1:42 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln	31 min
May 19, 1:58 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes, Lincoln	47 min
May 19, 2:39 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	51 min
May 19, 3:54 PM CDT	Severe Thunderstorm Warning	LBF	Custer	51 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.