Alert archive / South Dakota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 132, NWS Sioux Falls, SD

August 18, 1990Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 18, 1990, 5:39 PM CDT for Union County, South Dakota. It was in force for 22 min.

The area

The counties it named.

The facts

Issued: Aug 18, 1990, 5:39 PM CDT (22:39 UTC)
Expired: Aug 18, 1990, 6:01 PM CDT
In force: 22 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Union County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.7 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3631 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 68 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 KSUX 182239
SVRSUX
SDC127-182315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SIOUX CITY IA
539 PM CDT SAT AUG 18 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 615 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE SOUTHEAST PART OF SOUTH DAKOTA
      NORTHERN UNION

AT 535PM RADAR SHOWED A SEVERE THUNDERSTORM NEAR BERESFORD SOUTH
DAKOTA OR 40 MILES NORTHWEST OF SIOUX CITY. THE STORM WAS MOVING
NORTHEAST AT 15 MILES AN HOUR.

REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYING AREAS. IF YOU ARE IN THE PATH OF THIS STORM
TAKE SHELTER IN A REINFORCED BUILDING IMMEDIATELY.

ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORTS
OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

  THIS STORM SHOULD MOVE TO THE NORTHEAST OF BERESFORD rBY 6PM.

QUINN

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.

In the hours before

Special weather statement, Aug 18, 4:45 PM CDT, 54 minutes before

SDZ017-018-019-020-182245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
445 PM CDT SAT AUG 18 1990

AT 440 PM CDT SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED IN SOUTH
CENTRAL SOUTH DAKOTA AND HAD DEVELOPED IN SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA AND NORTHWEST IOWA.

THIS PRECIPITATION WAS MOSTLY SOUTH OF A LINE FROM NEAR MITCHELL TO 45
MILES EAST OF SIOUX FALLS NEAR WORTHINGTON.  THESE THUNDERSTORMS ARE
CAPABLE OF (PRODUCING HEAVY RAINS AND LARGE HAIL.

MOVEMENT WAS NORTHEAST AT 10 MILES AN HOUR.
 BERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 4:39 PM CDT	Severe Thunderstorm Warning	FSD	Turner	36 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1990 Every severe thunderstorm warning in 1990

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.