Alert archive / Nebraska / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 63, NWS North Platte, NE

June 2, 1999Sheridan County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 2, 1999, 9:15 PM MDT for Sheridan County, Nebraska. It was in force for 65 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 2, 1999, 9:15 PM MDT (03:15 UTC)
Expired: Jun 2, 1999, 10:20 PM MDT
In force: 65 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Sheridan County, NE

The radar

The North Platte radar (KLNX), 163 km from the middle of the area, began a volume at 03:15 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
Jun 2, 9:45 PM MDT	Hail 1	Rushville, NE

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 nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.3 hours before the alert went out and 178 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: 701 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2597 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 030315 RRA
SVRLBF
NEC161-030420-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1015 PM CDT (915 PM MDT) WED JUN 2 1999

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL AND NORTHERN SHERIDAN COUNTY IN THE NEBRASKA PANHANDLE

* UNTIL 1020 PM MDT (1120 PM CDT)

* AT 913 PM MDT... NORTH PLATTE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 20 MILES NORTHEAST OF ALLIANCE OR 5 MILES SOUTHWEST
  OF SMITH LAKE... MOVING NORTHEAST AT 20 MPH.

* DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  SMITH LAKE                   BY 925 PM MDT

DAMAGING WINDS AND LARGE HAIL ARE LIKELvY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

KAR

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 2, 2:01 PM MDT, 7 hours 14 minutes earlier.

Area forecast discussion, Jun 2, 2:01 PM MDT, 7 hours 14 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
301 PM CDT WED JUN 2 1999

...FORECAST CHALLENGE TO BE POPS THROUGH THE FCST CYCLE...

VISIBLE SATELLITE PRESENTLY SHOWING FEW CLOUDS OVER FA WITH NARROW
BAND OF AC MOVING NE. SLY SFC WINDS RETURNED DWPTS INTO THE 50S.
18Z SFC HAND ANALYSIS HAD DRYLINE EXTENDING S FM ERN WY NR LAR
S TO DEN TO E OF PUB S ACROSS ERN NM.

MODELS SIMILAR OVER THE CENTRAL PLAINS WITH SW FLOW ALOFT TO REMAIN
ESTABLISHED THROUGH 48 HOURS AS UPPER RIDGE BUILDS E AND BECOMES
NEGATIVELY TILTED. MODELS DIFFER IN HANDLING MAIN 5H LOW CENTER OVER
SWRN CONUS WITH ETA TO DIG CENTER ALONG MORE SW TRACK. ETA/AVN MODEL
BLEND PREFERRED WITH SWRN 5H LOW CENTER TO DIG FURTHER S ALONG THE CA
COAST WITH JET CORE UPSTREAM TO LIMIT NEWD MOVEMENT OF CENTER THROUGH
48 HOURS. AVN IS SLOWEST MOVING SYSTEM E WITH LEESIDE TROUGH TO
REMAIN TO THE W THROUGH 72 HOURS UNDER ESTABLISHED SW FLOW.

THIS EVENING THE ATMOSPHERE WILL FURTHER DESTABILIZE AS SLY LLJ
INCREASES 45 TO 50 KTS BY 03/06Z OVER THE HIGH PLAINS WITH DWPTS TO
REACH INTO THE 60S OVER FA. CAPES WILL RANGE FM 800 TO 1600 J/KG
WITH HIGHER RANGE OVER THE NEB PANHANDLE AND EXTREME SWRN FA. LIS
WILL BE AROUND -4 WITH MEAN RH THE MAIN LIMITING FACTOR FOR SHOWERS
AND THUNDERSTORMS OVER THE WRN FA THROUGH MIDNIGHT WITH HIGHEST POPS
OVER EXTREME SWRN FA AND SERN NEB PANHANDLE WITH SCT CONVECTION
POSSIBLE AFTER SUNSET. AS 5H WAVE MOVES THROUGH OVERNIGHT CLOUD
DEBRIS FM EARLIER CONVECTION W TO MOISTEN ATMOSPHERE WITH FEW SHOWERS
POSSIBLY A TSTM INTO NCNTRL NEB AFTER MIDNIGHT. GUIDANCE LOWS LOOK
REASONABLE WITH READINGS INTO THE UPPER 50S TO LOWER 60S.

THURSDAY A BETTER CHANCE FOR SEVERE THUNDERSTORMS OVER CNTRL
PORTIONS OF FA AS DRYLINE REMAINS IN THE W. LLJ CONTINUES
TO TRANSPORT MOISTURE NWD WITH CAPE INCREASING FM AROUND 2000 J/KG IN
THE MORNING TO NEAR 4400 J/KB BY EVENING WITH MAIN AXIS N ACROSS
NCNTRL NEB WITH NO CIN INDICATED BY EVENING. GUIDANCE TEMPERATURES
LOOKING TOO COOL AND WILL GO A CATEGORY ABOVE WHICH WILL RESULT IN
HIGHER LIS AND CAPE VALUES DURING THE AFTN. SPLIT UPPER JET
INDICATED WITH AREA OF DIFLUENCE ALOFT TO ENHANCE LIFT DURING THE
EVENING. MEAN RH WILL REMAIN LOW WITH SCATTERED CONVECTION SOME
WHICH MAY BE SEVERE ACROSS NCNTRL.

THURSDAY NIGHT INTO FRIDAY A CHANCE OF THUNDERSTORMS DURING THE LATE
AFTERNOON AND EVENING HOURS BUT ISOLATED AT BEST AS BEST MOISTURE
CONVERGENCE WILL BE TO THE E. A SERIES OF WAVES WILL BE EMBEDDED IN
SW FLOW ALOFT WITH A WAVE TO MOVE NE WITH SUBSIDENCE TO INCREASE
OVERNIGHT.

FRIDAY THROUGH SATURDAY EVENING 5H CLOSED LOW TO OPEN UP AND MOVE
THROUGH ERN CO INTO WRN NEB SATURDAY NIGHT. GREATEST POTENTIAL FOR
THUNDERSTORMS TO BE SATURDAY NIGHT INTO SUNDAY MORNING. THEN
SUBSIDENCE TO INCREASE SUNDAY AFTERNOON INTO MONDAY WITH SW FLOW
ALOFT TO CONTINUE AS MAIN ENERGY MOVES THROUGH TO OUR NW. LONGTERM
GUIDANCE CLOSE WITH TEMPERATURES FOLLOWED.

.LBF...NONE

KECK

In the hours before

Local storm report, Jun 2, 7:52 PM MDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
852 PM CDT WED JUN 2 1999

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

0845 PM    10 NW BRULE               NE   1.00 INCH HAIL
06/02/99   KEITH

BUTTLER

Local storm report, Jun 2, 7:52 PM MDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
852 PM CDT WED JUN 2 1999

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

0845 PM    10 NW BRULE               NE   1.00 INCH HAIL
06/02/99   KEITH

BUTTLER

Local storm report, Jun 2, 8:43 PM MDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
943 PM CDT WED JUN 2 1999

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

0940 PM    4 N ANTIOCH               NE   0.75 INCH HAIL
06/02/99   SHERIDAN

DJB

Local storm report, Jun 2, 8:43 PM MDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
943 PM CDT WED JUN 2 1999

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

0940 PM    4 N ANTIOCH               NE   0.75 INCH HAIL
06/02/99   SHERIDAN

DJB

Local storm report, Jun 2, 9:01 PM MDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1001 PM CDT WED JUN 2 1999

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

0945 PM    7 N ANTIOCH               NE   0.75 INCH HAIL
06/02/99   SHERIDAN

DJB

Local storm report, Jun 2, 9:01 PM MDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1001 PM CDT WED JUN 2 1999

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

0945 PM    7 N ANTIOCH               NE   0.75 INCH HAIL
06/02/99   SHERIDAN

DJB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 7:36 PM MDT	Severe Thunderstorm Warning	LBF	Keith	49 min
Jun 2, 8:12 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	63 min
Jun 2, 8:32 PM MDT	Severe Thunderstorm Warning	LBF	Chase	63 min
Jun 2, 9:36 PM MDT	Severe Thunderstorm Warning	LBF	Chase	59 min
Jun 2, 11:04 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	66 min
Jun 3, 4:45 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	50 min
Jun 3, 5:36 PM MDT	Tornado Warning	LBF	Sheridan	49 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1999 Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.