Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 120, NWS Sioux Falls, SD

August 19, 1997Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 19, 1997, 5:27 PM CDT for Dixon County, Nebraska. It was in force for 33 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, 1997, 5:27 PM CDT (22:27 UTC)
Expired: Aug 19, 1997, 6:00 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Dixon County, NE

The radar

The Sioux Falls radar (KFSD), 122 km from the middle of the area, began a volume at 22:26 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

Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 137 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: 6 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 492 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 148 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 KFSD 192227 RRA
SVRFSD
NEC051-192300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
527 PM CDT TUE AUG 19 1997

* SEVERE THUNDERSTORM WARNING FOR
  DIXON COUNTY IN NORTHEASTERN NEBRASKA

* UNTIL 600 PM CDT
 
* SOME AREAS AFFECTED
  ALLEN                    AROUND 535 PM CDT
  WAKEFIELD                AROUND 540 PM CDT

* AT 523 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM WITH DAMAGING WINDS 31 MILES NORTHEAST OF
  NORFOLK OR 3 MILES WEST OF CONCORD MOVING SOUTHEAST AT 35 MPH.
 
STRONG GUSTY WINDS...FREQUENT LIGHTNING...VERY HEAVY RAINFALL AND
SMALL HAIL MAY ACCOMPANY THE STRONGER STORMS.

WILLIAMS

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 10:02 AM CDT, 7 hours 25 minutes earlier.

Area forecast discussion, Aug 19, 10:02 AM CDT, 7 hours 25 minutes before

SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1000 AM CDT TUE AUG 19 1997

LN OF SHWRS/ISOLD TSTMS PUSHING SLOWLY EWD THRU SW MN AND INTO NW IA
ATTM. SLY FLW OF MOIST AIR WL CONTINUE IN CWA THIS AFTN WITH LOW CLDS
SLOW TO BRK FM W TO E. ANY HEATING AT ALL HOWEVER WL PROVIDE
ENVIRONMENT FOR SCT TSTM DVLPMT WITH COLD AIR ADV ALOFT DESTABILIZING
AIR MASS. BOUNDARY WL ALSO MOVE E INTO AREA. WhL FINE TUNE FSD TO SUX
AREA FOR CLDY SKIES BCMG PTSNY BY MID AFTN WITH SCT TSTMS DVLPG.

.FSD...NONE
RYRHOLM

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.