Alert archive / Nebraska / Tornado Warnings in 1999

Tornado Warning 36, NWS North Platte, NE

June 27, 1999Deuel County, Nebraska

NWS North Platte, NE issued this tornado warning at Jun 27, 1999, 10:44 PM MDT for Deuel County, Nebraska. It was in force for 66 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 27, 1999, 10:44 PM MDT (04:44 UTC)
Expired: Jun 27, 1999, 11:50 PM MDT
In force: 66 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Deuel County, NE

What was reported inside it

Time	Report	Where	Remark
Jun 27, 10:52 PM MDT	Tornado F0	Chappell, NE	The tornado touched down briefly.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 27, 7:15 PM MDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.7 hours before the alert went out and 145 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: 750 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.2

Open this sounding in Storm Lab

The text

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

549 
WFUS1 KLBF 280444 RRA
TORLBF
NEC049-280550-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1144 PM CDT (1044 PM MDT) SUN JUN 27 1999

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  DEUEL COUNTY IN THE NEBRASKA PANHANDLE

* UNTIL 1150 PM MDT (1250 AM CDT)

* AT 1043 PM MDT... NORTH PLATTE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO 22 MILES EAST OF SIDNEY OR 4 MILES WEST OF
  CHAPPELL... MOVING SOUTHEAST AT 20 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CHAPPELL                     BY 1050 PM MDT

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

M. MUTCHLER

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS North Platte, NE wrote its last area forecast discussion before this tornado warning went out at Jun 27, 12:15 PM MDT, 10 hours 29 minutes earlier.

Area forecast discussion, Jun 27, 12:15 PM MDT, 10 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
115 PM CDT SUN JUN 27 1999

...FCST CHALLENGE CONCERNS AMNT AND EXTENT OF PCPN ASSOCIATED WITH
DVLPMNT OF MCS TNGT...

ANOTHER ROUND OF WDSPRD CONVECT ACTIVITY EXPECTED TNGT AS ATMOS QUICKLY
RECOVERS FM LAST NGTS CONVECTION.  1800 UTC SFC ANALYSIS INDICATED WK
SFC LOW PRES OVR ERN WY WITH 2ND LOW OVR CNTRL KS.  WNDS AT SFC-H7
CONTG TO SLOLY VEER BACK INTO THE SE PER LTST SFC OBS AND MCK
PROFILER...WHICH WL ADVECT VRY HIGH THETA-E VALUES BACK INTO WRN HI
PLNS FOR REST OF AFTN INTO ERY TNGT.

APPROACH OF H5 SHRT WV MOVG EWD THRU NRN RCKYS WL INCRS DYNAMIC FORCING
AND MID LVL COOLING OVR LBF CWA...WITH LOW LVL JET AT H8 PROVIDING
ADTNL DESTAB OF LWR ATMOS AS WRM AND MOIST LOW LVL AIR FM GULF ADVECTED
OVR SFC BOUNDARY IN CNTRL KS.  CAPES OF 2000-3500 J/KG...H7-H5 DELTA T
OF 24C...AND H7-H5 LAPSE RATES OF ARND 8.5C/KM UNDERSCORE THE CONVECT
POTNL TNGT.  GOOD DIRECTIONAL AND SPEED SHEAR SHD SUPPORT SUPERCELL
DVLPMNT THIS EVNG...WITH WDSPRD HVY RAIN BCMG THE PRIMARY THREAT BY
MIDNIGHT AS CONVECTION BCMS ORGANIZED INTO AN MCS N OF THE FRONTAL
BOUNDARY.

WDLY SCT-SCTD CONVECT ACTVTY SHD MOV EWD OFF HIGH PLNS OF WY AND CO LTE
THIS AFTN...ORGANIZING INTO AN MCS OVR SWRN NE...NERN CO...AND NWRN KS
ERY TNGT ON NOSE OF H8 LLJ...WITH SYSTM TURNING MORE SEWD INTO
INSTABILITY AXIS WITH TIME.  MCS H2 DIVERGENCE SIGNATURE VRY NOTICABLE
BY H+18HRS (0600 UTC) PROGS ON BOTH ETA AND NGM...HOWEVER SRN PLACEMENT
OF ETA PREFERRED OVR NGM WHICH HAS CONSISTENTLY PLACED HVST RAFL N OF
ACTUAL AREA PST SVRL DAYS.

WITH PRECIPITABLE WATER VALUES OF 100-150% OF NRML OVR AREA...AND MCS
LKLY TO MOV OVR AREAS WHICH RCVD 1-4 LAST NGT...FLASH FLOOD WATCH WL
CONT TO BE NEEDED FOR MUCH OF SWRN NEB...AND NO CHG TO AREAL COVERAGE
FM PREV FCST SEEMS NEEDED ATTM.

MID LVL FORCING TGT WL BE GREATEST OVR NRN PTNS OF LBF CWA WHICH WL BE
CLOSER TO H5 SHRT WV MOVG EWD THRU NRN PLAINS...BUT LOW LVL SUPPORT FOR
MCS AND HVY RAFL POTNL BEST IN SW.  RESULT WL BE THAT ENTR LBF CWA WL
LKLY EXPERIENCE RN TNGT...BUT WITH EXCESSIVE RN NOT LKLY TO FALL IN
N CNTRL ZNS DESPITE RELATIVELY LOW FLASH FLOOD VALUES IN THIS AREA.

MCS SHD BE S AND E OF MOST OF LBF CWA BY DAYBREAK MON WITH WRN AND N
CNTRL NEB TO INITIALLY FALL UNDER WK CAA AND INCRG SUBSIDENCE ON
BACKSIDE OF SYS.  MOST OF AREA SHD RMN DRY THRU MUCH OF DAY...BUT WITH
THE THREAT OF SCT CONVECTION AGN INCRG IN FAR W AS TSTMS DVLP OVR FRONT
RANGE AND PROGRESS EWD.  MID LVL LAPSE RTES RMN STEEP OVR AREA THRU AT
LEAST TUE...AND WITH SFC WNDS VEERING BACK INTO THE SE OVR ALL OF WRN
AND N CNTRL NEB MON NGT...THE THREAT OF ANOTHER ROUND OF CONVECT WL
INCRS THRUT THE 3RD INTO THE 4TH PD OF THIS FCST...AND LKLY PERSIST
INTO THE EXTENDED FCST.

93-95P EXTENDED GRAPHICS LOOK REASONABLE AND WL NOT SIG MODIFY.

.LBF...FLASH FLOOD WATCH TONIGHT ZONES 036>038-056>059-069>071

WERT

In the hours before

Local storm report, Jun 27, 8:35 PM MDT, 2 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
935 PM CDT SUN JUN 27 1999

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0930 PM    4 SSE OGALLALA            NE   TORNADO
06/27/99   KEITH                          SPOTTER REPORTED

FWM

Local storm report, Jun 27, 9:13 PM MDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1013 PM CDT SUN JUN 27 1999

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1005 PM    10 NNW ELSIE              NE   1.75 INCH HAIL
06/27/99   PERKINS

FWM

Local storm report, Jun 27, 9:13 PM MDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1013 PM CDT SUN JUN 27 1999

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1005 PM    10 NNW ELSIE              NE   1.75 INCH HAIL
06/27/99   PERKINS

FWM

Special weather statement, Jun 27, 10:07 PM MDT, 37 minutes before

NEZ005>010-023>029-280440-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1106 PM CDT (1006 PM MDT) SUN JUN 27 1999

...SEVERE THUNDERSTORM WATCH CANCELLED FOR NORTH CENTRAL NEBRASKA...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR ALL OF NORTH
CENTRAL NEBRASKA UNTIL MIDNIGHT CDT (11 PM MDT) HAS BEEN CANCELLED.
SCATTERED THUNDERSTORMS CONTINUE ACROSS PARTS OF THE AREA...
HOWEVER...THESE STORMS ARE NOT EXPECTED TO REACH SEVERE LIMITS.

BOWMAN

Local storm report, Jun 27, 10:40 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1140 PM CDT SUN JUN 27 1999

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1135 PM    6 N GORDON                NE   0.75 INCH HAIL
06/27/99   SHERIDAN

1137 PM    8 NW CHAPPELL             NE   2.50 INCH HAIL
06/27/99   DEUEL

FWM

Local storm report, Jun 27, 10:40 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1140 PM CDT SUN JUN 27 1999

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1135 PM    6 N GORDON                NE   0.75 INCH HAIL
06/27/99   SHERIDAN

1137 PM    8 NW CHAPPELL             NE   2.50 INCH HAIL
06/27/99   DEUEL

FWM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 6:23 PM MDT	Tornado Warning	LBF	Blaine, Custer, Logan	62 min
Jun 27, 6:36 PM MDT	Tornado Warning	LBF	Garden	64 min
Jun 27, 6:54 PM MDT	Tornado Warning	LBF	Blaine	46 min
Jun 27, 7:37 PM MDT	Tornado Warning	LBF	Garden, Keith	63 min
Jun 27, 7:55 PM MDT	Tornado Warning	LBF	Deuel	35 min
Jun 27, 8:24 PM MDT	Tornado Warning	LBF	Keith, Perkins	61 min
Jun 27, 9:01 PM MDT	Tornado Warning	LBF	Lincoln	64 min
Jun 27, 10:24 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	66 min
Jun 27, 10:30 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	65 min
Jun 28, 12:13 AM MDT	Tornado Warning	LBF	Chase	62 min
Jun 28, 1:05 AM MDT	Tornado Warning	LBF	Chase	60 min

Nearby

Tornado Warnings in Nebraska, 1999 Every tornado warning in 1999 Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.