Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 67, NWS North Platte, NE

June 20, 1997Custer County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 20, 1997, 9:29 PM CDT for Custer County, Nebraska. It was in force for 61 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 20, 1997, 9:29 PM CDT (02:29 UTC)
Expired: Jun 20, 1997, 10:30 PM CDT
In force: 61 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Custer County, NE

What was reported inside it

Time	Report	Where	Remark
Jun 20, 9:39 PM CDT	Thunderstorm Wind 60	Callaway, 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 20, 8:00 PM CDT	Tornado 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: 3148 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1727 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 210229 RRA
SVRLBF
NEC041-210330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
929 PM CDT FRI JUN 20 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL NEBRASKA

   ...CUSTER COUNTY
 
AT 928 PM CDT DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS FROM 25 MILES NORTHWEST OF BROKEN BOW TO 40 MILES
SOUTHWEST OF BROKEN BOW MOVING EAST SOUTHEAST AT 30 MPH.

THE LINE OF STORMS SHOULD REACH BROKEN BOW BY 950 PM CDT.

A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN
PRODUCE TORNADOES.
 
IF YOU ARE IN THE PATH OF THIS STORM YOU SHOULD MOVE INTO A STRONG
BUILDING.  DO NOT STAND NEAR WINDOWS. DO NOT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS
PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

BOWMAN

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 20, 2:19 PM CDT, 7 hours 10 minutes earlier.

Area forecast discussion, Jun 20, 2:19 PM CDT, 7 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
215 PM CDT FRI JUN 20 1997

...THE IF, WHEN, AND WHERE FOR THE THUNDERSTORMS TONIGHT IS AGAIN THIS
AFTERNOON'S CHALLENGE...

HAVE FOCUSED ON THE IMMEDIATE PROBLEM OF THUNDERSTORMS WHILE CHOOSING TO
FLOCK-SHOOT THE OUT PERIODS USING THIS MORNING'S ETA.

THE KEY TO TONIGHT'S FORECAST SEEMS TO BE THE POSITION OF THE SURFACE
FRONT AND OTHER LOW-LEVEL BOUNDARIES ON THE 19Z SFC CHART THE FRONT
APPEARS TO BE NORTH OF BBW, OGA, AND LBF. THE 700 AND 850 MB THETA-E
ANALYSIS FROM 12Z BIG AREA OF 330 PLUS NEBRASKA AND KANSAS WITH 340
PLUS IN EASTERN KANSAS. ISENTROPIC ANALYSIS ON 305K SURFACE BETRAYS A
STEEP SLOPE JUST BEHIND SURFACE FRONT WITH WARM SECTOR MIXING RATIOS OF
12 TO 15 G/KG IN SOUTH CENTRAL AND SOUTHEAST NEBRASKA AND 16-17 G/KG IN
EASTERN KANSAS. THIS LOOKS TO BE AN EXTREMELY VOLATILE COMBINATION. A
COORDINATION CALL TO SPC SUGGESTED A DRIFT OF ALL THOSE PARAMETERS TO
THE NORTH AND WEST INTO CENTRAL AND EASTERN NEBRASKA. THUS...THE
MODERATE SEVERE RISK IN THAT AREA. TAKING IT ALL IN...SPC OUTLOOK AREA
LOOKS LIKE THE BEST SOLUTION FOR THIS EVENING.

SUGGEST BREAKING CENTRAL AND WESTERN NEBRASKA ZONES APPROXIMATELY ALONG
AN ANW-LBF LINE. AS YESTERDAY...WOULD HIT THE THUNDERSTORM FORECAST
HARD EAST OF THAT LINE. IN VIEW OF THE SLIGHT RISK AREA...65 DEGREE
DEWPOINTS AND FRONTAL FORCING...SIGNIFICANT POPS (SAY 40 OR 50 PERCENT)
ARE PROBABLY IN ORDER FOR THE SOUTHWEST AND PANHANDLE ZONES.

CURRENT TEMPERATURE FORECAST LOOKS GOOD FOR THE FIRST TWO PERIODS.

AS STATED ABOVE...HAVEN'T HAD TIME TO COME UP WITH ANY REASONS NOT TO
GO WITH ETA SOLUTION FOR SATURDAY AND SATURDAY NIGHT AND AVN/MRF
SOLUTION FOR SUNDAY. NONE OF THE BIG THREE MODELS HAVE SIGNIFICANT
CHANGE IN OVERALL 500 MB WIND AND VORTICITY FIELD...EXCEPT FOR
INCREASING SOUTHWESTERLY COMPONENT TO FLOW OVER THE HIGH PLAINS. THIS
DOES NOT PROMISE MORE THAN BRIEF BREAKS IN THE CURRENT REGIME OF LOW
LEVEL HEAT AND HUMIDITY AND SHORT WAVES PASSING OVER THE DAKOTAS.ETA
AND AVN/MRF ARE SIMILAR WITH LOW LEVEL PROGS...SO TEMPERATURE GUIDANCE
FROM THEM IS PROBABLY PRETTY GOOD.

RECOMMENDED FORECAST

NEZ004-005-023>025-210915-
SHERIDAN-CHERRY-GRANT-HOOKER-THOMAS-
INCLUDING THE COMMUNITIES OF VALENTINE...MULLEN
400 PM CDT FRI JUN 20 1997

.TONIGHT...A 50 PERCENT CHANCE OF THUNDERSTORMS. A SEVERE THUNDERSTORM
IS POSSIBLE.  LOW AROUND 60.  LIGHT NORTHEAST WIND.
.SATURDAY...PARTLY CLOUDY AND A LITTLE COOLER.  HIGH AROUND 80.
NORTHEAST WIND 5 TO 10 MPH.
.SATURDAY NIGHT...PARTLY CLOUDY.  LOW AROUND 60.
.SUNDAY...PARTLY CLOUDY.  HIGH 85 TO 90.

NEZ006>010-026>029-038-210915-
KEYA PAHA-BOYD-BROWN-ROCK-HOLT-BLAINE-LOUP-GARFIELD-WHEELER-CUSTER-
INCLUDING THE COMMUNITIES OF AINSWORTH...O NEILL...BURWELL...BROKEN
BOW
400 PM CDT FRI JUN 20 1997

.TONIGHT...SCATTERED THUNDERSTORMS WITH SEVERE THUNDEERSTORMS POSSIBLE.
LOW AROUND 60.  LIGHT NORTHEAST WIND.
.SATURDAY...PARTLY CLOUDY AND A LITTLE COOLER.  HIGH AROUND 80.
NORTHEAST WIND 5 TO 10 MPH.
.SATURDAY NIGHT...PARTLY CLOUDY.  LOW AROUND 60.
.SUNDAY...PARTLY CLOUDY.  HIGH IN THE MID 80S.

NEZ022-035>037-056>059-069>071-210915-
GARDEN-ARTHUR-MCPHERSON-LOGAN-DEUEL-KEITH-PERKINS-LINCOLN-CHASE-HAYES-
FRONTIER-
INCLUDING THE CITIES OF OGALLALA...NORTH PLATTE...IMPERIAL...
400 PM CDT FRI JUN 20 1997

.TONIGHT...A 40 PERCENT CHANCE OF THUNDERSTORMS. A SEVERE STORM IS
POSSIBLE.  LOW AROUND 60. NORTHEAST WIND 5 TO 10 MPH.
.SATURDAY...PARTLY CLOUDY AND A LITTLE COOLER.  LOW 80 TO 85. NORTHEAST
WIND 5 TO 10 MPH.
.SATURDAY NIGHT...PARTLY CLOUDY.  LOW 55 TO 60.
.SUNDAY...PARTLY CLOUDY.  HIGH NEAR 90.

VTN BB 059/082 058/087 49500
ANW BB 060h/081 059/086 49600
ONL BB 061/080 060/084 49600
BBW BB 060/081 060/086 49600
LBF BB 059/082 058/088 49400
OGA BB 060/083 059/088 49400
IML BB 061/084 060/089 49400

SPRINGER

In the hours before

Local storm report, Jun 20, 8:08 PM CDT, 1 hour 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
808 PM CDT FRI JUN 20 1997

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

0640 PM    14 N ANTIOCH              NE   0.88 INCH HAIL
06/20/97   SHERIDAN

0740 PM    13 ENE ARTHUR             NE   1.75 INCH HAIL
06/20/97   ARTHUR

0800 PM    12 W TRYON                NE   3.50 INCH HAIL
06/20/97   MCPHERSON

DAUGHERTY

Local storm report, Jun 20, 8:09 PM CDT, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
808 PM CDT FRI JUN 20 1997

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

0640 PM    14 N ANTIOCH              NE   0.88 INCH HAIL
06/20/97   SHERIDAN

0740 PM    13 ENE ARTHUR             NE   1.75 INCH HAIL
06/20/97   ARTHUR

0800 PM    12 W TRYON                NE   3.50 INCH HAIL
06/20/97   MCPHERSON

DAUGHERTY

Special weather statement, Jun 20, 8:56 PM CDT, 33 minutes before

NEZ024-025-036-210205-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
856 PM CDT (756 PM MDT) FRI JUN 20 1997

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN THOMAS COUNTY
REMAINS IN EFFECT UNTIL 905 PM CDT...

THE SEVERE THUNDERSTORM WARNING FOR EASTERN HOOKER AND EASTERN
MCPHERSON COUNTIES IS CANCELLED...

AT 8 55 PM CDT A SEVERE THUNDERSTORM WAS LOCATED NEAR THEDFORD AND
WAS MOVING EAST AT 30 MPH.

IF THREATENING WEATHER IS SIGHTED MOVE TO A PLACE OF SAFETY
IMMEDIATELY.

BOWMAN

Local storm report, Jun 20, 9:27 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
927 PM CDT FRI JUN 20 1997

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

0840 PM    10 W NORTH PLATTE         NE   1.00 INCH HAIL
06/20/97   LINCOLN

0855 PM    2 SW STAPLETON            NE   0.88 INCH HAIL
06/20/97   LOGAN

DAUGHERTY

Local storm report, Jun 20, 9:28 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
927 PM CDT FRI JUN 20 1997

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

0840 PM    10 W NORTH PLATTE         NE   1.00 INCH HAIL
06/20/97   LINCOLN

0855 PM    2 SW STAPLETON            NE   0.88 INCH HAIL
06/20/97   LOGAN

DAUGHERTY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:16 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, McPherson	64 min
Jun 20, 7:25 PM CDT	Tornado Warning	LBF	Cherry	35 min
Jun 20, 8:20 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, McPherson, Thomas	45 min
Jun 20, 8:38 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	62 min
Jun 20, 8:50 PM CDT	Severe Thunderstorm Warning	LBF	Logan	65 min
Jun 20, 9:00 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	65 min
Jun 20, 9:08 PM CDT	Tornado Warning	LBF	Logan	32 min
Jun 20, 9:41 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	64 min
Jun 20, 10:42 PM CDT	Severe Thunderstorm Warning	LBF	Perkins	63 min
Jun 20, 10:53 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	62 min
Jun 20, 11:15 PM CDT	Severe Thunderstorm Warning	LBF	Hayes	65 min
Jun 20, 11:38 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	62 min
Jun 21, 10:45 AM CDT	Severe Thunderstorm Warning	LBF	Holt, Rock	65 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.