Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 187, NWS North Platte, NE

August 14, 1997Holt County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 14, 1997, 7:33 PM CDT for Holt County, Nebraska. It was in force for 62 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: Aug 14, 1997, 7:33 PM CDT (00:33 UTC)
Expired: Aug 14, 1997, 8:35 PM CDT
In force: 62 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Holt County, NE

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 00:35 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
Aug 14, 7:45 PM CDT	Hail 0.75	Inman, 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.6 hours before the alert went out and 211 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: 219 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 2279 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 150033 RRA
SVRLBF
NEC089-150135-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
733 PM CDT THU AUG 14 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 835 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL NEBRASKA

   ...EASTERN HOLT COUNTY
 
AT 733 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH PLATTE
DOPPLER RADAR 6 MILES SOUTH SOUTHEAST OF O NEILL OR 6 MILES WEST
SOUTHWEST OF PAGE MOVING EAST NORTHEAST AT 25 MPH.

DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  PAGE                         BY 745 PM CDT
  EWING                        BY 745 PM CDT
 
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.

COGIL

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 Aug 14, 2:46 PM CDT, 4 hours 47 minutes earlier.

Area forecast discussion, Aug 14, 2:46 PM CDT, 4 hours 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
243 PM CDT THU AUG 14 1997

TIMING AND EXTENT OF SHRA/TSRA THE MAIN QUESTION FOR TONIGHT...WITH
TEMPS LATER IN THE PERIOD...

18Z SFC ANALYSIS HAS MAIN TROF FROM EAST OF ONL TO EAST OF GRI. A
SECOND TROF IS LOCATED FROM LOW IN ND SWD THRU WRN SD TO WRN NEBR. KLNX
88D HAS SHRA AND WEAK TSRA MOVING QUICKLY EWD AHEAD OF NEXT MAIN WAVE
TO ENTER THE STATE AS PER 5MV.

THE ETA RUN LOOKS TO HAVE THE SHORT WAVE MOVING INTO THE NWRN PART OF
THE STATE BEST DEFINED. THIS WAVE IS MOVING QUICKLY EWD IN MAIN LONG
WAVE TROF ALOFT. 17Z SOUNDING FROM KLBF HAS SOME DRY AIR ABOVE THE SFC
BUT IT HAS MOISTENED SOME SINCE 12Z. MODIFIED 17Z SOUNDING HAS CAPE
AROUND 2000 J/KG AND A LIFTED INDEX OF -7 FOR LBF. WITH BROAD AREA OF
WRLY FLOW AT THE SFC...DONT EXPECTED MUCH CONVERGENCE AT THE
SFC....HOWEVER EARLIER RUC DID PICK UP ON SOME. LIKE THE NEW 94O IN
THAT BEST CHANCE FOR SVR WOULD BE E OF CWA TONIGHT...ALTHO WITH DEW
POINTS STILL IN THE 60S IN THE E...ISOLD HAIL PROBABLY POSSIBLE.
CURRENT SHRA/TSRA HAVE TOPS TO NEAR 30K FT OR SO WITH NORTHERN STORMS
STRONGEST FOR NOW. WILL HAVE TO INCLUDE SCT TSRA/SHRA IN WRN ZONES
FOR THIS EVENING...AND FOR TONIGHT FURTHER E. WITH COLD AIR ALOFT
CONINTUING INTO TONIGHT...SKIES SHOULD BE PC THRU MIDNIGHT BUT CLEARING
THEREAFTER.

FOR FRIDAY...NGM TIME CROSS SECTIONS HAVE INCREASING MID LEVEL MOISTURE
INDICATED...BUT FWC PRODUCT CARRIES NO CLOUDS WHICH SEEMS PECULIAR.
ANYWAY...FRONT LOOKS TO MOVE THRU THE NRN HALF OF CWA FRI EVENING AND
THRU THE REMAINDER OF THE AREA LATE FRI NIGHT. LOW LLEVEL MOISTURE WILL
BE LIMITED WITH THIS SYSTEM SO WILL ONLY GO WITH WDLY SCT POPS FOR
FRONTAL PASSAGE. GUIDANCE TEMPS FOR FRI LOOK TOO HIGH ON FAN AND WILL
FOLLOW FWC FOR THIS. WILL ALSO GO A BIT UNDER GUIDANCE FOR SAT MAXES
BASED ON TIMING OF FRONT AND AMOUNT OF COLD AIR ADVECTION INDICATED AT
850 PER NGM GRIDS.

CCF
LBF BB 056/088 056/083 055 69202    (WDLY SCT THIS EVE)
OGA BB 055/089 057/084 056 69202            "
IML BB 056/089 057/085 057 69202            "
VTN BE 056/086 054/079 052 69322    (SCT THIS EVE)
ONL BE 059/085 057/080 056 69322     30 PERCENT THRU MIDNIGHT

STOPPKOTTE

In the hours before

Local storm report, Aug 14, 6:36 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
636 PM CDT THU AUG 14 1997

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

0605 PM    22 NNW ONEILL             NE   2.00 INCH HAIL
08/14/97   HOLT

0615 PM    4 SSE SPENCER             NE   1.50 INCH HAIL
08/14/97   BOYD

DAUGHERTY

Local storm report, Aug 14, 6:37 PM CDT, 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
636 PM CDT THU AUG 14 1997

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

06045 PM    22 NNW ONEILL             NE   2.00 INCH HAIL
08/14/97   HOLT

0615 PM    4 SSE SPENCER             NE   1.50 INCH HAIL
08/14/97   BOYD

DAUGHERTY

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.