Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 310, NWS North Platte, NE

August 18, 2011Boyd County, Holt County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 18, 2011, 4:54 PM CDT for Boyd County, Holt County, Nebraska. It was in force for 66 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: Aug 18, 2011, 4:54 PM CDT (21:54 UTC)
Expired: Aug 18, 2011, 6:00 PM CDT
In force: 66 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Boyd County, NE, Holt County, NE

The radar

The Sioux Falls radar (KFSD), 172 km from the middle of the area, began a volume at 21:55 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 18, 5:13 PM CDT	HAIL 1.5	5 Sse Bristow, 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 12:00Z, 9.9 hours before the alert went out and 235 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: 1181 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 683 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 385 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 11.7

Open this sounding in Storm Lab

The text

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

851 
WUUS53 KLBF 182154
SVRLBF
NEC015-089-182300-
/O.NEW.KLBF.SV.W.0310.110818T2154Z-110818T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
454 PM CDT THU AUG 18 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BOYD COUNTY IN NORTH CENTRAL NEBRASKA...
  NORTHEASTERN HOLT COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 600 PM CDT

* AT 450 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR SPENCER DAM...OR NEAR SPENCER...AND MOVING EAST AT 30
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  BRISTOW...LYNCH...REDBIRD STATE WILDLIFE MANAGEMENT AREA AND
  MONOWI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4252 9830 4281 9880 4289 9875 4288 9830
TIME...MOT...LOC 2154Z 282DEG 27KT 4282 9867
WIND...HAIL 60MPH 1.50IN

$$

SPRINGER

3 follow-up statements

422 
WWUS53 KLBF 182213
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
513 PM CDT THU AUG 18 2011

NEC015-089-182300-
/O.CON.KLBF.SV.W.0310.000000T0000Z-110818T2300Z/
BOYD NE-HOLT NE-
513 PM CDT THU AUG 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
HOLT AND SOUTHEASTERN BOYD COUNTIES UNTIL 600 PM CDT...

AT 509 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
MIDWAY...OR 11 MILES SOUTHEAST OF SPENCER...MOVING SOUTHEAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE...
  REDBIRD STATE WILDLIFE MANAGEMENT AREA AND MONOWI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4252 9830 4281 9880 4289 9875 4288 9830
TIME...MOT...LOC 2213Z 312DEG 26KT 4272 9856
WIND...HAIL 70MPH 1.75IN

$$

SPRINGER

004 
WWUS53 KLBF 182232 RRA
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
532 PM CDT THU AUG 18 2011

NEC015-182242-
/O.CAN.KLBF.SV.W.0310.000000T0000Z-110818T2300Z/
BOYD NE-
532 PM CDT THU AUG 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BOYD COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF BOYD COUNTY.

LAT...LON 4252 9830 4281 9880 4283 9879 4283 9876
      4281 9872 4281 9866 4278 9859 4277 9845
      4278 9843 4278 9839 4276 9830
TIME...MOT...LOC 2232Z 312DEG 26KT 4263 9842

$$

NEC089-182300-
/O.CON.KLBF.SV.W.0310.000000T0000Z-110818T2300Z/
HOLT NE-
532 PM CDT THU AUG 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
HOLT COUNTY UNTIL 600 PM CDT...

AT 527 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 7
MILES SOUTH OF REDBIRD STATE WILDLIFE MANAGEMENT AREA...OR 16 MILES
NORTHEAST OF ONEILL...MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN HOLT COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4252 9830 4281 9880 4283 9879 4283 9876
      4281 9872 4281 9866 4278 9859 4277 9845
      4278 9843 4278 9839 4276 9830
TIME...MOT...LOC 2232Z 312DEG 26KT 4263 9842
WIND...HAIL 70MPH 1.75IN

$$

SPRINGER

485 
WWUS53 KLBF 182301
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
601 PM CDT THU AUG 18 2011

NEC089-182311-
/O.EXP.KLBF.SV.W.0310.000000T0000Z-110818T2300Z/
HOLT NE-
601 PM CDT THU AUG 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HOLT COUNTY HAS
EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

REMEMBER...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL HOLT 
COUNTY UNTIL 630 PM CDT.

LAT...LON 4252 9830 4281 9880 4283 9879 4283 9876
      4281 9872 4281 9866 4278 9859 4277 9845
      4278 9843 4278 9839 4276 9830
TIME...MOT...LOC 2232Z 312DEG 26KT 4263 9842

$$

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 7:07 PM CDT	Tornado Warning	LBF	Cherry, Hooker	38 min
Aug 17, 7:36 PM CDT	Severe Thunderstorm Warning	LBF	Chase	39 min
Aug 17, 7:44 PM CDT	Tornado Warning	LBF	Hooker	46 min
Aug 17, 8:13 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, McPherson	62 min
Aug 17, 9:10 PM CDT	Tornado Warning	LBF	Brown, Cherry, Keya Paha	35 min
Aug 17, 9:44 PM CDT	Tornado Warning	LBF	Brown, Keya Paha, Rock	31 min
Aug 17, 10:09 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Brown, Holt, Keya Paha, Rock	51 min
Aug 18, 4:22 PM CDT	Severe Thunderstorm Warning	LBF	Boyd	53 min
Aug 18, 4:43 PM CDT	Severe Thunderstorm Warning	LBF	Holt	47 min
Aug 18, 5:19 PM CDT	Tornado Warning	LBF	Holt	26 min
Aug 18, 5:25 PM CDT	Severe Thunderstorm Warning	LBF	Holt	50 min
Aug 18, 5:53 PM CDT	Tornado Warning	LBF	Holt	37 min
Aug 18, 6:39 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	66 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2011 Every severe thunderstorm warning in 2011

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.