Alert archive / South Dakota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 60, NWS Sioux Falls, SD

May 30, 1998Lake County, Moody County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 30, 1998, 9:09 PM CDT for Lake County, Moody County, South Dakota. It was in force for 31 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: May 30, 1998, 9:09 PM CDT (02:09 UTC)
Expired: May 30, 1998, 9:40 PM CDT
In force: 31 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Lake County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 50 km from the middle of the area, began a volume at 02:09 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 30, 4:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.2 hours before the alert went out and 154 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: 1585 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1033 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 310209 RRA
SVRFSD
SDC079-101-310240-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
909 PM CDT SAT MAY 30 1998

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA
  MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 940 PM CDT

* AT 907 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 28 MILES WEST OF PIPESTONE  OR 7 MILES
  SOUTHWEST OF LONE TREE MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EGAN                     AROUND 915 PM CDT
  TRENT                    AROUND 920 PM CDT

A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN AND
OCCASIONALLY DO PRODUCE TORNADOES.


SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

CHAPMAN

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 May 30, 9:52 AM CDT, 11 hours 17 minutes earlier.

Area forecast discussion, May 30, 9:52 AM CDT, 11 hours 17 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
952 AM CDT SAT MAY 30 1998

WL UPDATE ZONES TO GET RID OF WATCH. WSR-88D AT FSD SHOWS TSTMS STILL
STG VCNTY NEBRASKA BRDR E OF YKN INTO NW IA. MAY NEED TO REEVALUATE HI
TEMPS THIS AFTN BASED ON RAIN COOLING.

.FSD...NONE

BLOOM

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 7:23 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	32 min
May 30, 7:40 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	30 min
May 30, 7:44 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson	31 min
May 30, 8:12 PM CDT	Tornado Warning	FSD	Hanson	33 min
May 30, 8:24 PM CDT	Severe Thunderstorm Warning	FSD	Miner	31 min
May 30, 8:32 PM CDT	Tornado Warning	FSD	McCook	33 min
May 30, 8:45 PM CDT	Tornado Warning	FSD	Hanson	35 min
May 30, 9:04 PM CDT	Tornado Warning	FSD	McCook	36 min
May 30, 9:20 PM CDT	Tornado Warning	FSD	Minnehaha	50 min
May 30, 9:28 PM CDT	Tornado Warning	FSD	Turner	32 min
May 30, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	32 min
May 30, 9:56 PM CDT	Tornado Warning	FSD	Lincoln	24 min
May 30, 10:08 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	32 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.