Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 91, NWS North Platte, NE

June 30, 1997Cherry County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 30, 1997, 5:16 PM MDT for Cherry County, Nebraska. It was in force for 64 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 30, 1997, 5:16 PM MDT (23:16 UTC)
Expired
Jun 30, 1997, 6:20 PM MDT
In force
64 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Cherry County, NE

The radar

The North Platte radar (KLNX), 79 km from the middle of the area, began a volume at 23:16 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.

IssuedProductOfficeLasted
Jun 30, 4:00 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 163 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 1997-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1288 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 1997-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1288 J/kg
Mixed-layer CIN
-218 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 302316 RRA
SVRLBF
NEC031-010020-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
616 PM CDT (516 PM MDT) MON JUN 30 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 720 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL NEBRASKA

   ...WESTERN CHERRY COUNTY
 
AT 615 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 39 MILES NORTH NORTHWEST OF MULLEN OR 27 MILES WEST
SOUTHWEST OF MERRITT RESERVOIR MOVING EAST AT 15 MPH.

THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS.
 
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITT6LE OR NO ADVANCE WARNING.  IF YOU ARE IN THE PATH OF THIS STORM
YOU SHOULD MOVE INSIDE A STRONG BUILDING AND GO TO THE LOWEST FLOOR
POSSIBLE.

DAUGHERTY

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 30, 2:11 PM MDT, 3 hours 5 minutes earlier.

Area forecast discussion, Jun 30, 2:11 PM MDT, 3 hours 5 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
310 PM CDT MON JUN 30 1997

...FORECAST PROBLEM TO BE POPS AND TEMPS...

A SURFACE LOW DEVELOPING OVER THE NEBRASKA PANHANDLE WILL INCREASE LOW
LEVEL MOISTURE CONVERGENCE OVER NORTHERN NEBRASKA WITH EXISTING OUTFLOW
BOUNDARIES THE FOCUS FOR WIDELY SCATTERED THUNDERSTORM DEVELOPMENT THIS
EVENING ACROSS PORTIONS OF THE NORTHWEST AND NORTH CENTRAL FORECAST
AREAS. VISIBLE SATELLITE IMAGERY ALREADY SHOWING CLOUD DEVELOPMENT
NORTHEAST OF A LINE FROM MERRIMAN TO MULLEN TO BROKEN BOW. WEAK
REFLECTIVITY RETURNS SHOWING UP WITHIN CLOUD DEVELOPMENT AREA ON KLNX
88D.

CAP REMAINS IN PLACE WITH 16Z MODIFIED UPPER AIR SOUNDING AT LBF SHOWING
CAP STRENGTH OF 2.8 DEG C...LI OF -9 AND CAPE 3484 J/KG. MODELS ARE
SIMILIAR WITH UPPER LEVEL FEATURES DURING THE NEXT 48 HOURS WITH STRONG
SURFACE LOW MOVING EAST WITH TEMPERATURES RETURNING TO NEAR NORMAL
RANGES ON TUESDAY AFTER FRONTAL PASSAGE. HOWEVER 500 MB CUT OFF LOW
APPEARS TO BE STILL SPINNING OVER THE PACIFIC COAST AND MAY RESULT IN
SLOWER MOVEMENT AND TIMING OF SURFACE LOW PRESSURE SYSTEM MOVING
THROUGH THE CENTRAL PLAINS ON TUESDAY.

BELIEVE CAP WILL LIMIT THUNDERSTORM DEVELOP MAINLY TO THE NORTH CENTRAL
NORTH OF A LINE FROM BBW TO MERRIMAN. AN ISOLATED THUNDERSTORM MAY
DEVELOP OVER THE REST OF THE COUNTY WARNING AREA. 200-300 MB JET STREAM
AXIS SHOWS JET REORIENTATING WITH JET STREAK TO EXTEND EAST ACROSS
NEBRASKA THIS EVENING WITH NORTH CENTRAL WITHIN LEFT FRONT EXIT REGION
FOR ADDITIONAL LIFT COMBINED WITH WEAK 500 MB SHORTWAVE TO MOVE
THROUGH.

ON TUESDAY DRYLINE WILL MOVE EAST DURING THE MORNING THEN COLD FRONTAL
PASSAGE IN THE EVENING. WARM MID LEVEL WILL RESIDE OVER FORECAST AREA
WITH GREATEST POPS FOR NORTH CENTRAL WITH LOW LEVEL JET TO SHIFT TO THE
SOUTHWEST WITH MOISTURE CONVERGENCE AND DYNAMICS PROVIDES BEST LIFT FOR
THUNDERSTORM DEVELOPMENT IN THE NORTHEAST.

TEMPERATURES GUIDANCES CLOSE BUT PREFER THE WARMER FWC MOS WITH WARMER
TEMPS PROGGED. PRESENT FORECAST LOOKS ON TRACK FOR TONIGHT.

LBF BB 065/090 056/085 122   ONL BB 062/091 060/082 324
IML BB 063/092 052/080 122   BBW BB 065/092 060/082 220
VTN BB 064/090 052/085 220

WOOD

In the hours before

Local storm report, Jun 30, 4:32 PM MDT, 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
532 PM CDT MON JUN 30 1997

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

0500 PM    NENZEL                    NE   1.50 INCH HAIL
06/30/97   CHERRY

DAUGHERTY

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 3:35 PM MDTSevere Thunderstorm WarningLBFCherry50 min
Jun 30, 4:16 PM MDTSevere Thunderstorm WarningLBFCherry49 min
Jun 30, 4:50 PM MDTSevere Thunderstorm WarningLBFBrown65 min
Jun 30, 5:05 PM MDTTornado WarningLBFBrown35 min
Jun 30, 5:42 PM MDTTornado WarningLBFBrown33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1997Every severe thunderstorm warning in 1997

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.