Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 55, NWS Sioux Falls, SD

June 16, 1990Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 16, 1990, 8:03 PM CDT for Osceola County, Iowa. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Jun 16, 1990, 8:03 PM CDT (01:03 UTC)
Expired
Jun 16, 1990, 8:30 PM CDT
In force
27 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Osceola County, IA

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

Minneapolis, MN (KSTC), launched 00:00Z, 1.1 hours before the alert went out and 230 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, Minneapolis, MN at 00:00Z on 1990-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1990-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
185 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 170103
SVRFSD
IAC143-170130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SIOUX FALLS SD
803 PM CDT SAT JUN 16 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE NORTHWEST PART OF IOWA
      OSCEOLA

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE  ASHTON...MELVIN
AND SIBLEY.

AT 755 PM CDT  RADAR INDICATED A SEVERE THUNDERSTORM JUST WEST OF
SIBLEY...OR 40 MILES SOUTHEAST OF SIOUX FALLS. MOVEMENT WAS
NORTHEAST AT 35 MILES AN HOUR.

IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED
SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF
60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAIN
THAT CAN QUICKLY FLOOD A LOW LYING AREA.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

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, Jun 16, 6:53 PM CDT, 1 hour 10 minutes before
SDZ012-018-170015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
652 PM CDT SAT JUN 16 1990

...LINE OF THUNDERSTORMS MOVING ACROSS BROOKINGS AND LAKE COUNTIES
OF EASTERN SOUTH DAKOTA...

AT 650 PM CDT RADAR INDICATED A LINE OF THUNDERSTORMS WITH HEAVY RAINS
FROM 50 MILES NORTH NORTHWEST OF SIOUX FALLS NEAR BROOKINGS TO 35 MILES
NORTHWEST OF SIOUX FALLS JUST SOUTHWEST OF MADISON SOUTH DAKOTA.
THIS LINE WAS MOVING EAST AT 45 MPH.

GUSTY WINDS...SMALL HAIL AND HEAVY RAINS CAN BE EXPECTED WITH THIS LINE
AS IT MOVES EAST ACROSS LAKE AND BROOKINGS COUNTY.
Special weather statement, Jun 16, 7:17 PM CDT, 46 minutes before
SDZ012-017-018-019-020-170100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
717 PM CDT SAT JUN 16 1990

...TORNADO WATCH IN EFFECT FOR SOUTHCENTRAL AND SOUTHEAST SOUTH
DAKOTA UNTIL 7PM CDT...

AT 705 PM CDT SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED
IN SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA.

THE THUNDERSTORMS EXTENDED FROM NEAR YANKTON TO NEAR BROOKINGS.

STRONGER THUNDERSTORMS WERE LOCATED NEAR BROOKINGS AND 25 MILES SOUTH/
EAST OF SIOUX FALLS NEAR SIOUX CENTER IOWA.

THESE STORMS ARE CAPABLE OF DANGEROUS CLOUD TO GROUND LIGHTNING...
HAIL AND GUSTY WINDS.
THESE STORMS CAN PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING SO BE ON THE LOOKOUT AND  LISTEN TO LATER STATEMENTS AND
WARNINGS.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.
 BERG
Special weather statement, Jun 16, 7:22 PM CDT, 41 minutes before
SDZ012-017-018-019-020-170100-

SPECIAL WEATHER STATEMENT   ...CORRECTED FOR TORNADO WATCH...
NATIONAL WEATHER SERVICE SIOUX FALLS SD
722 PM CDT SAT JUN 16 1990

...TORNADO WATCH IN EFFECT FOR EAST CENTRAL AND SOUTHEAST SOUTH
DAKOTA...SOUTHWEST MINNESOTA AND NORTHWEST IOWA UNTIL 11 PM CDT...

AT 705 PM CDT SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED
IN SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA.

THE THUNDERSTORMS EXTENDED FROM NEAR YANKTON TO NEAR BROOKINGS.

STRONGER THUNDERSTORMS WERE LOCATED NEAR BROOKINGS AND 25 MILES SOUTH/
EAST OF SIOUX FALLS NEAR SIOUX CENTER IOWA.

THESE STORMS ARE CAPABLE OF PRODUCING DANGEROUS CLOUD TO GROUND
LIGHTENING...HAIL AND GUSTY WINDS.
TH1ESE STORMS CAN PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING SO BE ON THE LOOKOUT AND LISTEN TO LATER STATEMENTS AND
WARNINGS.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.
 BERG
Special weather statement, Jun 16, 7:25 PM CDT, 38 minutes before
IAZ004-170130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
725 PM CDT SAT JUN 16 1990

...A FLASH FLOOD WATCH IS IN EFFECT FOR NORTHEAST NEBRASKA AND
   NORTHWEST IOWA TONIGHT...
...A TORNADO WATCH IS IN EFFECT FOR NORTHEAST NEBRASKA UNTIL 9 PM CDT.
...A TORNADO WATCH IS IN EFFECT FOR SOUTHEAST SOUTH DAKOTA AND PART
   OF NORTHWEST IOWA UNTIL 11 PM CDT...

STRONG THUNDERSTORMS WERE MOVING ACROSS SIOUX COUNTY IOWA EARLY THIS
EVENING. AT 7:20 PM CDT RADAR SHOWED THUNDERSTORMS NORTH OF A LINE
FROM CHATSWORTH IOWA TO HOSPERS IOWA. THE STORMS WERE MOVING
NORTHEAST AT 35 MPH.

THE STORM WILL PRODUCE LOCALLY HEAVY RANFALL AND MAY PRODUCE PEA TO
MARBLE SIZE HAIL. PEOPLE IN SIOUX COUNTY SHOULD BE ALERT TO CHANGING
WEATHER CONDITIONS AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF
THREATENING WEATHER APPROACHES.

HOPPES
Special weather statement, Jun 16, 7:56 PM CDT, 7 minutes before
SDZ010-161930-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
750 PM CDT SAT JUN 16 1990

...TORNADO WATCH IN EFFECT FOR PARTS OF EAST CENTRAL AND SOUTHEAST
SOUTH DAKOTA UNTIL 11 PM CDT.

AT 730 PM CDT...A ISOLATED THUNDERSTORM WITH VERY HEAVY RAIN AND HAIL WAS
LOCATED 10 MILES SOUTHEAST OF BROOKINGS NEAR ELKTON. MOVEMENT WAS EAST
AT 50 MILES AN HOUR.

ALSO...A LARGE AREA OF SHOWERS AN NUMEROUS THUNDERSTORMS CONTINUED
OVER EASTERN AND SOUTHEAST SOUTH DAKOTA. THE AREA WAS FROM NORTHEAST
SOUTH DAKOTA TO NORTHEAST NEBRASKA AND EAST OF A LINE FROM SISSETON
TO 30 MILES SOUTHEAST OF PIERRE TO SOUTH OF LAKE ANDES NEAR THE
MISSOURI RIVER. THE STRONGEST THUNDERSTORMSz WERE 30 MILES EAST OF
YANKTON AND 20 MILES NORTH OF SIOUX FALLS. MOVEMENT WAS EAST AT 50
MILES AN HOUR.
MOHR
Special weather statement, Jun 16, 8:01 PM CDT, 2 minutes before
SDZ012-170130-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY..CORRECTION...
NATIONAL WEATHER SERVICE HURON SD
750 PM CDT SAT JUN 16 1990

...TORNADO WATCH IN EFFECT FOR PARTS OF EAST CENTRAL AND SOUTHEAST
SOUTH DAKOTA UNTIL 11 PM CDT.

AT 730 PM CDT...A ISOLATED THUNDERSTORM WITH VERY HEAVY RAIN AND HAIL WAS
LOCATED 10 MILES SOUTHEAST OF BROOKINGS NEAR ELKTON. MOVEMENT WAS EAST
AT 50 MILES AN HOUR.

ALSO...A LARGE AREA OF SHOWERS AN NUMEROUS THUNDERSTORMS CONTINUED
OVER EASTERN AND SOUTHEAST SOUTH DAKOTA. THE AREA WAS FROM NORTHEAST
SOUTH DAKOTA TO NORTHEAST NEBRASKA AND EAST OF A LINE FROM SISSETON
TO 30 MILES SOUTHEAST OF PIERRE TO SOUTH OF LAKE ANDES NEAR THE
MISSOURI RIVER. THE STRONGEST THUNDERSTORMS WERE 30 MILES EAST OF
YANKTON AND 20 MILES NORTH OF SIOUX FALLS. MOVEMENT WAS EAST AT 50
MILES AN HOUR.
MOHR

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 16, 7:32 PM CDTSevere Thunderstorm WarningFSDSioux28 min
Jun 16, 7:39 PM CDTFlash Flood WarningFSDLyon, Sioux4 hr
Jun 16, 8:26 PM CDTSevere Thunderstorm WarningFSDMonona, Woodbury64 min
Jun 16, 9:08 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida37 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Every 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.