Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 116, NWS North Platte, NE

July 9, 1997Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 9, 1997, 12:33 AM MDT for Perkins County, Nebraska. It was in force for 47 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
Jul 9, 1997, 12:33 AM MDT (06:33 UTC)
Expired
Jul 9, 1997, 1:20 AM MDT
In force
47 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 06:51 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 6.6 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 1997-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2697 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 00:00Z on 1997-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.1939Sfc1 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
2697 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
1643 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.5
Supercell composite
9.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 090633 RRA
SVRLBF
NEC135-090720-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
133 AM CDT (1233 AM MDT) WED JUL 9 1997

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE NE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 120 AM MDT (220 AM CDT)
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHWESTERN NEBRASKA

   ...PERKINS COUNTY
 
AT 1228 AM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY NORTH
PLATTE DOPPLER RADAR 15 MILES SOUTH SOUTHEAST OF OGALLALA OR 6
MILES NORTH NORTHWEST OF MADRID MOVING EAST SOUTHEAST AT 10 MPH.

ANOTHER SEVERE THUNDERSTORMS WAS LOCATED 5 MILES SOUTHWEST OF GRANT
OR 23 MILES SOUTH OF OGALLALA MOVING EAST AT 10 MPH.

DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  MADRID BY 1245 AM MDT AND IN OPEN RURAL AREAS SOUTH OF GRANT
THROUGH 100 AM MDT.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LTIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

RLB

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 Jul 8, 1:51 PM MDT, 10 hours 42 minutes earlier.

Area forecast discussion, Jul 8, 1:51 PM MDT, 10 hours 42 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
250 PM CDT TUE JUL 8 1997

FORECAST PROBLEM...CHANCE OF THUNDERSTORMS AND TEMPERATURES

WATER VAPOR IMAGERY INDICATING MOISTURE STREAMING NORTH INTO ROCKIES
AND PLAINS AROUND BACKSIDE OF UPPER RIDGE OVER TEXAS. CU VISIBLE ON
SATELLITE OVER CENTRAL NEBRASKA PANHANDLE AND NEAR KANSAS BORDER IN
SOUTHWEST NEBRASKA. MAIN BOUNDARY EXTENDS FROM NORTHWEST PANHANDLE
THROUGH SOUTHWEST CUSTER. KLNX RADAR RETURNS VERY LIGHT AND DECREASE
AS THEY MOVE EAST.
NGM/ETA FORECAST UPPER FLOW TO AMPLIFY THROUGH PERIOD WITH RIDGE OVER
THE ROCKIES SHIFTING EAST INTO THE MO VALLEY. BOTH MODELS KEEP
SHORTWAVES MOVING INTO FA THROUGH PERIOD. ETA MODEL FORECAST 700MB
TEMPERATURES SHOWS 10 DEGREE TEMPERATURES FOR WESTERN NEBRASKA BY 00Z
WEDNESDAY WITH A 10-13 DEGREE RANGE ACROSS FORECAST AREA BY END OF
PERIOD. CAP MAY SUPPRESS CONVECTION OVER FA BUT THUNDERSTORMS COULD
DRIFT INTO WESTERN FA BEFORE DISSIPATING. LATEST TREND IS FOR
CONVECTION TO DEVELOP OVERNIGHT ACROSS NORTHCENTRAL AND ETA Q-G FORCING
INDICATES THAT POSSIBILITY BOTH TONIGHT AND WEDNESDAY NIGHT...
ALTHOUGH FORCING DOES NOT APPEAR AS GOOD WEDNESDAY NIGHT...PROBABLY
DUE TO STRONGER CAP. NO Q-G FORCING IS INDICATED FOR FA ON
THURSDAY EVEN WITH PVA PROBABLY DUE ONCE AGAIN TO STRONG CAP IN PLACE.

WINDS SHOULD BE SOUTHEAST TONIGHT AT 5-10 AHEAD OF LOW PRESSURE IN
EASTERN WYOMING. SOUTH WINDS SHOULD CONTINUE THROUGH REST OF PERIOD
AHEAD OF LOW PRESSURE MOVING INTO EASTERN MONTANA.
WEDNESDAY.........SOUTH 10-20
WEDNESDAY NIGHT...SOUTHEAST 5-15
THURSDAY..........SOUTH 15-25

MIXING ETA 700 TEMPERATURES DOWN TO THE SURFACE YIELDS WARMER
TEMPERATURES THAN GUIDANCE. HOWEVER WILL GO WITH NEAR NGM GUIDANCE FOR
LOWS.

LBF UU 061/090 064/092 064 54322    ONL UU 061/089 064/093 065 54-22
IML UU 061/091 063/093 063 54322    VTN UU 060/091 064/094 065 54322
OGA UU 060/089 063/091 063 54322

FS

In the hours before

Local storm report, Jul 8, 10:44 PM MDT, 1 hour 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1144 PM CDT TUE JUL 8 1997

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

0850 PM    12 SW OSHKOSH             NE   1.50 INCH HAIL
07/08/97   GARDEN

0830 PM    12 SW OSHKOSH             NE   1.50 INCH HAIL
07/08/97   GARDEN

0930 PM    8 N CHAPPELL              NE   1.00 INCH HAIL
07/08/97   DEUEL

1020 PM    12 NNE OSHKOSH            NE   0.88 INCH HAIL
07/08/97   GARDEN

1020 PM    2 N ASHBY                 NE   0.75 INCH HAIL
07/08/97   GRANT

1050 PM    8 N HYANNIS               NE   0.75 INCH HAIL
07/08/97   CHERRY

1120 PM    5 N HYANNIS               NE   0.88 INCH HAIL
07/08/97   GRANT

1000 PM    10 NNW CHAPPELL           NE   1.75 INCH HAIL
07/08/97   DEUEL

RLB
Local storm report, Jul 8, 10:45 PM MDT, 1 hour 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1144 PM CDT TUE JUL 8 1997

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

0850 PM    12 SW OSHKOSH             NE   1.50 INCH HAIL
07/08/97   GARDEN

0830 PM    12 SW OSHKOSH             NE   1.50 INCH HAIL
07/08/97   GARDEN

0930 PM    8 N CHAPPELL              NE   1.00 INCH HAIL
07/08/97   DEUEL

1020 PM    12 NNE OSHKOSH            NE   0.88 INCH HAIL
07/08/97   GARDEN

1020 PM    2 N ASHBY                 NE   0.75 INCH HAIL
07/08/97   GRANT

1050 PM    8 N HYANNIS               NE   0.75 INCH HAIL
07/08/97   CHERRY

1120 PM    5 N HYANNIS             L  NE   0.88 INCH HAIL
07/08/97   GRANT

1000 PM    10 NNW CHAPPELL           NE   1.75 INCH HAIL
07/08/97   DEUEL

RLB
Local storm report, Jul 8, 11:17 PM MDT, 1 hour 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1217 AM CDT WED JUL 9 1997

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

1159 PM    9 N CHAPPELL              NE   1.75 INCH HAIL
07/08/97   DEUEL

M. MUTCHLER
Local storm report, Jul 8, 11:18 PM MDT, 1 hour 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
1217 AM CDT WED JUL 9 1997

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

1159 PM    9 N CHAPPELL              NE   1.75 INCH HAIL
07/08/97   DEUEL

M. MUTCHLER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 6:37 PM MDTSevere Thunderstorm WarningLBFGarden63 min
Jul 8, 7:41 PM MDTSevere Thunderstorm WarningLBFGarden49 min
Jul 8, 8:05 PM MDTSevere Thunderstorm WarningLBFDeuel50 min
Jul 8, 8:15 PM MDTSevere Thunderstorm WarningLBFGarden65 min
Jul 8, 8:32 PM MDTSevere Thunderstorm WarningLBFGarden63 min
Jul 8, 8:55 PM MDTSevere Thunderstorm WarningLBFDeuel35 min
Jul 8, 9:03 PM MDTSevere Thunderstorm WarningLBFGrant32 min
Jul 8, 9:35 PM MDTSevere Thunderstorm WarningLBFCherry, Grant65 min
Jul 8, 10:34 PM MDTSevere Thunderstorm WarningLBFKeith, Perkins51 min
Jul 8, 10:51 PM MDTSevere Thunderstorm WarningLBFGarden64 min
Jul 8, 11:03 PM MDTSevere Thunderstorm WarningLBFDeuel62 min
Jul 8, 11:26 PM MDTSevere Thunderstorm WarningLBFPerkins64 min
Jul 8, 11:33 PM MDTSevere Thunderstorm WarningLBFMcPherson62 min
Jul 9, 1:06 AM MDTSevere Thunderstorm WarningLBFChase64 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.