Alert archive / Nebraska / Tornado Warnings in 1999

Tornado Warning 48, NWS Hastings, NE

August 15, 1999Buffalo County, Nebraska

NWS Hastings, NE issued this tornado warning at Aug 15, 1999, 7:25 PM CDT for Buffalo County, Nebraska. It was in force for 35 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 15, 1999, 7:25 PM CDT (00:25 UTC)
Expired
Aug 15, 1999, 8:00 PM CDT
In force
35 min
Issued by
NWS Hastings, NE
Area
Whole counties

County Buffalo County, NE

The radar

The Grand Island radar (KUEX), 80 km from the middle of the area, began a volume at 00:27 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, 0.4 hours before the alert went out and 132 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 1999-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 1999-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.19395878Sfc1 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
117 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
2924 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

160 
WFUS1 KGRI 160025 RRA
TORGRI
NEC019-160100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
725 PM CDT SUN AUG 15 1999

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* TORNADO WARNING FOR PEOPLE IN...
  EASTERN BUFFALO COUNTY IN SOUTH CENTRAL NEBRASKA

* UNTIL 800 PM CDT

* AT 723 PM CDT...THE PUBLIC REPORTED A TORNADO 15 MILES EAST OF
  KEARNEY...OR 2 MILES EAST OF GIBBON...MOVING NORTHEAST AT 40 MPH.

SOME LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...

  SHELTON

THIS IS AN EXTREMELY DANGEROUS SITUATION. A TORNADO HAS BEEN SIGHTED.
PEOPLE IN SOUTHEASTERN BUFFALO COUNTY SHOULD TAKE SHELTER IMMEDIATELY
IN A BASEMENT OR SMALL INTERIOR ROOM ON THE LOWEST FLOOR.

NEVER TRY TO OUTRUN A TORNADO. IF IN A VEHICLE...LEAVE IT IMMEDIATELY
AND GET INSIDE A STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE
FLAT IN THE NEAREST DITCH AND COVER YOUR HEAD WITH YOUR HANDS.

$$

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Hastings, NE wrote its last area forecast discussion before this tornado warning went out at Aug 15, 2:58 PM CDT, 4 hours 27 minutes earlier.

Area forecast discussion, Aug 15, 2:58 PM CDT, 4 hours 27 minutes before
SOUTH CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION...
NATIONAL WEATHER SERVICE HASTINGS NE
258 PM CDT SUN AUG 15 1999

...POPS STILL MAIN CHALLENGE THROUGH WED...

ELEVATED CONVECTION DEVELOPED LAST NIGHT AROUND 09Z OVER ERN PART OF
CWFA...AIDED BY 50 KNOT LOW LEVEL JET.  THE 00Z ETA RUN FROM LAST
EVENING DID NOT CATCH THIS...BUT THE 00Z NGM AND THE 12Z NGM FROM
YESTERDAY DID PREDICT IT.  SCENARIO FOR TONIGHT IS SOMEWHAT SIMILAR
WITH SOME FACTORS POINTING TO NOCTURNAL CONVECTION...AND THE
NGM/RUC/MM5 CALLING FOR PRECIP BUT THE ETA/AVN ARE DRY.

18Z SURFACE ANALYSIS HAS TROF TRYING TO ENTER WRN ZONES WITH MID 60S
DEWPOINTS AHEAD OF TROF...WITH THE LOW OVER NRN SD AND COLD FRONT
TRAILING.  MAIN ENERGY WITH DAKOTAS SYSTEM...BUT THERE ARE HINTS OF
WEAK SHORTWAVES RIDING THROUGH THE RIDGE AND THROUGH THE SUBTROPICAL
PLUME WHICH WOULD PROVIDE SOME LIFT.  IN ADDITION...THE H25 JET
DROPS SLIGHTLY SOUTH WITH CWFA UNDER WEAK-MDT DIVERGENCE TONIGHT.
THE SURFACE BOUNDARY SHOULD PROVIDE A FOCUS FOR CONVERGENCE.  THUS
IT IS DIFFICULT TO PIN DOWN THE MAGNITUDE OF VERTICAL MOTION TONIGHT
BUT GIVEN THE ADEQUATE AMOUNT OF MOISTURE TO WORK WITH AND A FEW
WEAK MECHANISMS...WILL GO WITH CHANCE POPS ALL OF CWFA TONIGHT...
AS ADVERTISED BY NGM/MM5/RUC.  MOST ACTIVITY SHOULD BE LATE...
HOWEVER LATEST VISIBLE IMAGERY SHOWING AC/CU RAPIDLY DEVELOPING OVER
NW KS/NE CO/SW NEBRASKA SO PERHAPS SOME EVENING ACTIVITY IS POSSIBLE
IN SW COUNTIES.  THIS IDEA SOMEWHAT SUPPORTED BY SPC SWODY1
DISCUSSION.

AFTER TONIGHT THE MODEL OF CHOICE IS LESS CLEAR AND ALL MODELS ARE
SIMILAR WITH FRONTAL PLACEMENT FROM ERN NEBRASKA INTO CENTRAL OR WRN
KS AREA BY 18Z MON.  THIS SEEMS TO BE ABOUT AS FAR SOUTH AS THE
UPPER WINDS WOULD ALLOW IT TO GO...THEN MON NT AND TUE IT SHOULD
WEAKEN AND MOST LIKELY DRIFT BACK NORTH AS UPPER RIDGE TRIES TO
REBUILD.  THE VAGUE LOCATION OF THIS FRONT AND LACK OF ANY DEFINED
LIFTING MECHANISMS MAKE THE QPF PLACEMENT DIFFICULT AT BEST.  WILL
CARRY LOW POPS MON NT WITH THE FRONT AND POSSIBLY EVEN TUE IN NRN
COUNTIES.  THIS IDEA SOMEWHAT SUPPORTED BY DAY2 QPFPFD.  THE AVN
SHOWS A FAST MOVING WAVE SLIDING DOWN INTO NE NEBRASKA TUE NT ON TOP
OF THE RIDGE...SO WILL NEED TO MONITOR THIS FEATURE WITH TIME.

GID ALREADY UP TO 90 AT THIS TIME...SO GUIDANCE HIGH TEMPERATURES OF
AROUND 90 AND 90-95 KS LOOK REASONABLE FOR MON AND TUE.  OVERALL THE
EXTENDED LOOKS QUIET WITH SEASONAL TEMPERATURES.

.GID...NONE.

NIETFELD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 7:05 PM CDTTornado WarningGIDHall40 min
Aug 15, 7:29 PM CDTSevere Thunderstorm WarningGIDMerrick, Nance46 min
Aug 15, 7:47 PM CDTSevere Thunderstorm WarningGIDHall, Howard43 min
Aug 15, 8:33 PM CDTSevere Thunderstorm WarningGIDHall42 min
Aug 15, 9:09 PM CDTSevere Thunderstorm WarningGIDMerrick36 min

Nearby

Tornado Warnings in Nebraska, 1999Every tornado warning in 1999Tornadoes in 1999

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.