Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 99, NWS North Platte, NE

June 7, 1998Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 7, 1998, 7:03 PM MDT for Perkins County, Nebraska. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 7, 1998, 7:03 PM MDT (01:03 UTC)
Expired: Jun 7, 1998, 8:05 PM MDT
In force: 62 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Perkins County, NE

The radar

The North Platte radar (KLNX), 152 km from the middle of the area, began a volume at 00:58 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.

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 7, 6:00 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.1 hours before the alert went out and 93 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: 68 J/kg
Mixed-layer CIN: -234 J/kg
Mixed-layer LCL: 1442 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 080102 RRA
SVRLBF
NEC135-080205-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
803 PM CDT (703 PM MDT) SUN JUN 7 1998

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN AND SOUTHERN PERKINS COUNTY IN SOUTHWESTERN NEBRASKA

* UNTIL 805 PM MDT (905 PM CDT)

* AT 700 PM MDT... NORTH PLATTE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 15 MILES WEST NORTHWEST OF IMPERIAL MOVING NORTHEAST
  AT 25 MPH.  THIS STORM HAS A HISTORY OF PRODUCING QUARTER-SIZE
  HAIL.

* DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  GRANT                        BY 735 PM MDT
  MADRID                       BY 740 PM MDT

A TORNADO WATCH IS IN EFFFECT! GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS! SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

SP

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 7, 1:53 PM MDT, 5 hours 10 minutes earlier.

Area forecast discussion, Jun 7, 1:53 PM MDT, 5 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
253 PM CDT SUN JUN 7 1998

...FORECAST PROBLEM WILL BE POPS...

MODELS SIMILAR COMBINING SPLIT FLOW IN 500 TROUGH OVER WESTERN U.S.
INTO ONE BROAD 500 TROUGH WITH WEAK SHORTWAVE INTO NORTHERN KS AND
SOUTHERN NEB BY 00Z TONIGHT WITH STRONGER SHORTWAVE EJECTING OUT OF
TROUGH INTO WESTERN NEBRASKA BY 12Z MON. STRONG NVA BEHIND SYSTEM IN
CWA BY 00Z TUE WITH 500 TROUGH REMAINING IN PLACE OVER WESTERN U.S.
THROUGH FORECAST PERIOD. THESE WAVES WILL ENCOUNTER INCREASING MOISTURE
WITH TIME AS LLJ REMAINS ACROSS CWA TONIGHT. UPSLOPE FLOW AND DECENT
ISENTROPIC LIFT ON THE I290...I295...I300 AND I305 SURFACES WILL ALSO
AID IN PRECIP. 850 DEW POINTS INCREASE TONIGHT WITH LLJ WITH 6-8 DEW
POINTS AT 00Z AND 8-12 BY 12Z. NGM DRIES OUT 850 TOO FAST AND LIKE ETA
WITH SLOWER PROGRESSION OF DRY AIR INTO CWA ON MONDAY. AIRMASS IS
PRETTY UNSTABLE WITH LIFTED INDEXES PROGGED IN 0 TO -4 RANGE TONIGHT
AND TOMORROW NIGHT AND 700-500 DELTA T GREATER THAN 19 OVER SOUTHERN
CWA TONIGHT. 850 AND 700 THTE RIDGES ALSO MOVE ACROSS CWA TONIGHT...SO
WITH ABOVE FACTORS PLUS STATIONARY FRONT THAT AT 18Z WAS NEAR SNY TO
SOUTH OF LBF TO STJ MEANS HIGH POPS ESPECIALLY ACROSS THE SOUTHERN CWA.

FOR MONDAY...WITH NVA ENTERING INTO PICTURE PLUS ISENTROPIC DOWNGLIDE
ON ALL FOUR SURFACES FROM I290 TO I305 MOVING ACROSS CWA DURING DAY AND
DRY SLOT WHICH CLIPS SOUTHERN HALF OF CWA...PRECIP SHOULD END IN
SOUTHERN NEBRASKA BEFORE NOON AND HANG ON ACROSS REST OF CWA. THIS DRY
SLOT WILL AFFECT TEMPS AND POPS WITH LOWEST TEMPS AND HIGHEST POPS IN
NORTH FOR MONDAY AND VICE VERSA FOR SOUTHERN CWA. WILL REMAIN WINDY
ACROSS CWA THROUGH MONDAY AS 850 GRADIENT TIGHTENS. FOR MONDAY
NIGHT...NORTH CENTRAL STILL REMAINS IN WRAPAROUND MOISTURE AND WILL
KEEP HIGHEST POPS THERE.

GOING FORECAST TONIGHT LOOKS GOOD...BUT RECOMMEND 50 TO 55 FOR ALL
ZONES.

PRELIMINARY GUIDANCE FOR COORDINATION ONLY.  OFFICIAL FORECASTS ARE
CONTAINED WITHIN PRODUCT OMAZFPNE.

CCF
LBF BB 052/076 049/076 052 707110  ANW TB 052/062 050/072 052 707532
OGA BB 053/076 050/076 053 707110  ONL TB 053/064 052/072 054 707533
IML BB 053/077 050/077 053 707110  BBW EB 052/071 050/074 053 707311
VTN TB 052/060 047/072 051 707531

MICHELS

In the hours before

Local storm report, Jun 7, 6:54 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
754 PM CDT SUN JUN 7 1998

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

0751 PM    LAMAR                     NE   1.00 INCH HAIL
06/07/98   CHASE

M. MUTCHLER

Local storm report, Jun 7, 6:54 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
754 PM CDT SUN JUN 7 1998

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

0751 PM    LAMAR                     NE   1.00 INCH HAIL
06/07/98   CHASE

M. MUTCHLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 6:20 PM MDT	Severe Thunderstorm Warning	LBF	Chase	60 min
Jun 7, 7:05 PM MDT	Tornado Warning	LBF	Chase	35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1998 Every severe thunderstorm warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.