Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 97, NWS North Platte, NE

June 30, 1997Custer County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 30, 1997, 9:31 PM CDT for Custer County, Nebraska. It was in force for 64 min. 3 reports 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 30, 1997, 9:31 PM CDT (02:31 UTC)
Expired: Jun 30, 1997, 10:35 PM CDT
In force: 64 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Custer County, NE

The radar

The North Platte radar (KLNX), 94 km from the middle of the area, began a volume at 02:32 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
Jun 30, 9:58 PM CDT	Hail 0.75	Comstock, NE
Jun 30, 10:15 PM CDT	Hail 1.75	Comstock, NE
Jun 30, 10:45 PM CDT	Hail 1	Comstock, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 30, 5:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.5 hours before the alert went out and 79 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: 2999 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1596 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 15.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 010231 RRA
SVRLBF
NEC041-010335-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
931 PM CDT MON JUN 30 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1035 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL NEBRASKA

   ...CUSTER COUNTY
 
AT 929 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 21 MILES NORTH OF BROKEN BOW OR 12 MILES WEST
NORTHWEST OF SARGENT MOVING SOUTH SOUTHEAST AT 35 MPH.

DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  SARGENT                      BY 940 PM CDT
  COMSTOCK                     BY 955 PM CDT
  BROKEN BOW                   BY 955 PM CDT
  WEISSERT                     BY 955 PM CDT
  WESTERVILLE                  BY 1005 PM CDT
 
IF YOU ARE IN THE PATH OF THIS STORM YOU SHOULD MOVE INTO A STRONG
BUILDING.  DO NOT STAND NEAR WINDOWS. DO NOLT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS
PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

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, 3:11 PM CDT, 6 hours 20 minutes earlier.

Area forecast discussion, Jun 30, 3:11 PM CDT, 6 hours 20 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, 5:32 PM CDT, 3 hours 59 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

Local storm report, Jun 30, 6:30 PM CDT, 3 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
630 PM CDT MON JUN 30 1997

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

0620 PM    4 WNW JOHNSTOWN           NE   1.75 INCH HAIL
06/30/97   BROWN

DAUGHERTY

Local storm report, Jun 30, 6:34 PM CDT, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
634 PM CDT MON JUN 30 1997

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

0551 PM    2 SE WOODLAKE             NE   1.75 INCH HAIL
06/30/97   CHERRY

DAUGHERTY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 7:17 PM CDT	Tornado Warning	LBF	Brown	33 min
Jun 30, 7:23 PM CDT	Tornado Warning	LBF	Cherry	32 min
Jun 30, 7:52 PM CDT	Tornado Warning	LBF	Brown	33 min
Jun 30, 7:56 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	64 min
Jun 30, 8:00 PM CDT	Severe Thunderstorm Warning	LBF	Rock	65 min
Jun 30, 8:18 PM CDT	Flash Flood Warning	LBF	Brown	3 hr
Jun 30, 8:26 PM CDT	Tornado Warning	LBF	Brown	34 min
Jun 30, 8:37 PM CDT	Severe Thunderstorm Warning	LBF	Brown	48 min
Jun 30, 8:46 PM CDT	Tornado Warning	LBF	Rock	64 min
Jun 30, 9:03 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Brown	62 min
Jun 30, 9:15 PM CDT	Severe Thunderstorm Warning	LBF	Loup	65 min
Jun 30, 9:54 PM CDT	Tornado Warning	LBF	Loup	31 min
Jun 30, 10:25 PM CDT	Tornado Warning	LBF	Loup	30 min
Jun 30, 10:34 PM CDT	Severe Thunderstorm Warning	LBF	Custer	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1997 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.