Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 255, NWS North Platte, NE

August 19, 1998Loup County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 19, 1998, 7:32 PM CDT for Loup County, Nebraska. It was in force for 63 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: Aug 19, 1998, 7:32 PM CDT (00:32 UTC)
Expired: Aug 19, 1998, 8:35 PM CDT
In force: 63 min
Issued by: NWS North Platte, NE
Area: Whole counties

County Loup County, NE

The radar

The North Platte radar (KLNX), 93 km from the middle of the area, began a volume at 00:36 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, 0.5 hours before the alert went out and 129 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: 858 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1933 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 200032 RRA
SVRLBF
NEC115-200135-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
732 PM CDT WED AUG 19 1998

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN LOUP COUNTY IN NORTH CENTRAL NEBRASKA

* UNTIL 835 PM CDT

* AT 731 PM CDT... NORTH PLATTE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 39 MILES SOUTH SOUTHEAST OF AINSWORTH OR 13 MILES
  NORTHWEST OF ALMERIA MOVING NORTH NORTHEAST AT 15 MPH.

* THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS MAINLY NORTH OF
  HIGHWAY 91 AND WEST OF HIGHWAY 183.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AW:AY FROM WINDOWS!

GM

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 19, 2:56 PM CDT, 4 hours 36 minutes earlier.

Area forecast discussion, Aug 19, 2:56 PM CDT, 4 hours 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
256 PM CDT WED AUG 19 1998

...FORECAST PROBLEM WILL BE POSSIBLE POPS...

500 RIDGE REMAINS IN CONTROL OF CENTRAL PLAINS WEATHER WITH WEAK
SHORTWAVES MOVING THRU THE RIDGE. ONE WEAK WAVE MOVES ACROSS CWA TODAY
AND DIFFICULT TO PICK OUT OTHER ONES ON MODELS SINCE NGM AND ETA HAVE
DIFFERENT WAVES COMING THRU CWA AT DIFFERENT TIMES AND PLACES.
CONFIDENCE IN MODEL FORECAST IS VERY LOW WITH NGM BULLISH ON PCPN WHILE
ETA IS MUCH LESS.

18Z SFC CHART SHOWED WARM FRONT FROM ACROSS EASTERN NEB WITH COLD FRONT
ALONG NEB...SD BORDER WEST OF VTN. LEE SIDE TROUGH FROM WEST OF VTN TO
OGA THRU EASTERN CO. ETA AND NGM SHOW NO ORGANIZED Q VECTOR CONVERGENCE
IN 850-700...700-500 AND 500-300 LAYERS THRU THE FORECAST PERIOD. 850
AND 700 THTE RIDGES REMAIN ANCHORED NEAR OR ACROSS CWA THRU PERIOD.
CONTINUE TO BE UNSTABLE WITH CAPES THRU THE PERIOD IN 500-1500 J/KG AND
WITH CIN -20 TO -40 TONIGHT AND -20 TO -60 TOMORROW NIGHT. 700-500
DELTA-T GREATER THAN 19 OVER WESTERN CWA THRU PERIOD. LLJ ALSO OCCURS
TOMORROW NIGHT WITH 850 DEW POINTS IN 10-15 RANGE THRU PERIOD. NGM
BULLISH WITH PCPN THRU PERIOD WITH LMVV AND LMRH 60-70 PERCENT IN ALL
THREE LAYERS ACROSS CWA THRU PERIOD WITH ETA SHOWING THIS OVER SOUTHERN
CWA ONLY AT 36 HOURS. WITH COOLER 700 TEMPS...CAP NOT THAT STRONG...BUT
NOT EXACTLY CONFIDENT EITHER IN WIDESPREAD PCPN...SO WILL GO 30 POPS
ALONG CONVERGENCE LINE SHOWING UP ON SATELLITE AND KLNX RADAR AS
THUNDERSTORMS BEGIN TO FORM ALONG THE 850 OR 700 FRONT. WILL CONTINUE
WITH HIGHER POPS THRU PERIOD IN NORTHERN CWA DUE TO FRONT HANGING UP
THERE AND GO LATE AFTERNOON POPS IN SOUTHERN CWA DUE TO PROXIMITY OF
FRONT AND WEAKER CAP.

PRELIMINARY GUIDANCE FOR COORDINATION ONLY.  OFFICIAL FORECASTS ARE
CONTAINED WITHIN PRODUCT OMAZFPLBF.

CCF
LBF BB 064/088 064/090 063 702222  ANW BB 066/086 067/088 066 702332
OGA BB 065/089 065/090 064 702222  ONL BB 068/088 068/088 067 702332
IML BB 066/090 065/091 065 702222  BBW BB 066/088 066/089 065 702222
VTN BB 065/085 065/089 064 703332

MICHELS

In the hours before

Local storm report, Aug 19, 6:00 PM CDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
600 PM CDT WED AUG 19 1998

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

0515 PM    11 N WAUNETA              NE   0.75 INCH HAIL
08/19/98   CHASE

0510 PM    16 WNW HAYES CENTER       NE   1.25 INCH HAIL
08/19/98   HAYES

0505 PM    9 SW BASSETT              NE   0.75 INCH HAIL
08/19/98   ROCK

410  PM    11 S JOHNSON              NE   1.00 INCH HAIL
08/19/98   BROWN

TLW

Local storm report, Aug 19, 6:00 PM CDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
600 PM CDT WED AUG 19 1998

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

0515 PM    11 N WAUNETA              NE   0.75 INCH HAIL
08/19/98   CHASE

0510 PM    16 WNW HAYES CENTER       NE   1.25 INCH HAIL
08/19/98   HAYES

0505 PM    9 SW BASSETT              NE   0.75 INCH HAIL
08/19/98   ROCK

410  PM    11 S JOHNSON              NE   1.00 INCH HAIL
08/19/98   BROWN

TLW

Local storm report, Aug 19, 7:19 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
719 PM CDT WED AUG 19 1998

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

0658 PM    STAPLETON                 NE   60 MPH WIND GUST
08/19/98   LOGAN

0647 PM    3 NW LNCH                 NE   0.75 INCH HAIL
08/19/98   BOYD

0540 PM    5 NE NEWPORT              NE   0.75 INCH HAIL
08/19/98   ROCK

TLW

Local storm report, Aug 19, 7:19 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE  NORTH PLATTE NE
719 PM CDT WED AUG 19 1998

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

0658 PM    STAPLETON                 NE   60 MPH WIND GUST
08/19/98   LOGAN

0647 PM    3 NW LNCH                 NE   0.75 INCH HAIL
08/19/98   BOYD

0540 PM    5 NE NEWPORT              NE   0.75 INCH HAIL
08/19/98   ROCK

TLW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:33 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	32 min
Aug 19, 8:55 PM CDT	Severe Thunderstorm Warning	LBF	Thomas	35 min
Aug 20, 3:34 PM CDT	Severe Thunderstorm Warning	LBF	Custer	51 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1998 Every severe thunderstorm warning in 1998

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.