Alert archive / Iowa / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 41, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1989, 11:38 PM CDT for Lyon County, Iowa; Rock County, Minnesota. It was in force for 52 min.
The area
The counties it named.
The facts
- Issued
- Jun 20, 1989, 11:38 PM CDT (04:38 UTC)
- Expired
- Jun 21, 1989, 12:30 AM CDT
- In force
- 52 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Rock County, MN
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
Aberdeen, SD (KHON), launched 00:00Z, 4.6 hours before the alert went out and 231 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- NaN m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 210439
SVRFSD
IAC119-MNC117-133-210530-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1138 PM CDT TUE JUN 20 1989
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1230 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHWEST IOWA
...LYON
IN SOUTHWEST MINNESOTA
...SOUTHERN PIPESTONE...ROCK
SOME CITIES INCLUDED IN THIS SEVERE THUNDERSTORM WARNING ARE
PIPESTONE AND LUVERNE IN SOUTHWEST MINNESOTA AND ROCK RAPIDS
IN NORTHWEST IOWA.
AT 1133 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
EXTENDING FROM 30 MILES NORTHEAST OF SIOUX FALLS...OR 10 MILES
SOUTHWEST OF PIPESTONE...TO 25 MILES SOUTHEAST OF SIOUX FALLS
NEAR INWOOD IOWA.
THIS LINE OF SEVERE THUDNERSTORMS WAS MOVING EAST AT 30 MPH.
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THU%NDERSTORM PRODUCES 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.
KAPELAWhat 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 20, 7:43 PM CDT, 3 hours 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
740 PM CDT TUE JUN 20 1989
...THUNDERSTORMS BOIL UP IN SOUTHCENTRAL SOUTH DAKOTA...
AT 740 PM CDT SCATTERED THUNDERSTORMS WERE QUICKLY DEVELOPING
OVER SOUTHCENTRAL SOUTH DAKOTA. THE THUNDERSTORMS WERE IN AN AREA
FROM AROUND BONESTEEL TO STICKNEY...OR ABOUT 60 TO 25 MILES SOUTHWEST
OF MITCHELL SOUTH DAKOTA. ANY OF THESE THUNDERSTORMS COULD PRODUCE
STRONG GUSTY WINDS...HAIL...AND BRIEF HEAVY RAINS AS THEY MOVE NORTHEAST
AT ABOUT 30 MPH ALONG A COLD FRONT. RESIDENTS IN THE AREA FROM AROUND
BONESTEEL TO MITCHELL SHOULD BE ON THE LOOKOUT FOR THESE STORMS THIS
EVENING THROUGH AT LEAST 10 PM CDT.
BOATERS ON LAKE FRA;NCIS CASE SHOULD SEEK SAFE HARBOR SINCE THUNDERSTORMS
ARE EXPECTED THROUGH THE REMAINDER OF TONIGHT.
KAPELASpecial weather statement, Jun 20, 7:46 PM CDT, 3 hours 52 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 745 PM CDT TUE JUN 20 1989 AT 730 PM CDT...A THUNDERSTORM WITH VERY HEAVY RAIN AND HAIL HAD BEGUN MOVING INTO SOUTHEAST SOUTH DAKOTA FROM NEBRASKA. THE STORM WAS NEAR BONESTEEL...WHICH IS 75 MILES SOUTHWEST OF MITCHELL. MOVEMENT WAS NORTH AT 15 MILES AN HOUR. VERY HEAVY RAIN...HAIL...AND STRONG WIND IS LIKELY IN THE AREA ALONG AND 15 MILES EITHER SIDE OF A ALINE FROM BONESTEEL TO PLATTE... WHICH IS 50 MILES SOUTHWEST OF MITCHELL. SPRINGER
Local storm report, Jun 20, 10:12 PM CDT, 1 hour 26 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1010 PM CDT TUE JUN 20 1989
STORM DATA FOR SOUTH DAKOTA
TIME COUNTY..LOCATION CHARACTER OF STORM..DAMAGE
.......................................................................
651 PM CDT GREGORY...BURKE HEAVY RAINS AND PEA SIZE HAIL
900 PM CDT AURORA...WHITE LAKE 3/4 INCH SIZE HAIL OR LARGER
ROOFS BLOWN OFF A FEW SMALL
SHEDS
940 PM CDT CHARLES MIX...GEDDES FARMER REPORTED 2.50 INCHES
OF RAIN IN ONE HOUR
943 PM CDT DAVISON...MITCHELL RADIO STATION HAD 66 MPH GUST
KAPELASpecial weather statement, Jun 20, 11:38 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 1140 PM CDT TUE JUN 20 1989 ...A SEVERE THUNDERSTORMS WATCH IS IN EFFECT UNTIL 2 AM CDT FOR MOST OF EASTERN SOUTH DAKOTA... AT 1130 PM CDT...NUMEROUS THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER EASTERN SOUTH DAKOTA...MAINLY IN THE AREA NORTH AND EAST OF A LINE FROM CHAMBERLAIN...THROUGH HURON...TO ABERDEEN. VERY HEAVY RAIN...HAIL...AND STRONG WIND ARE LIKELY IN THE AREA EAST OF THE JAMES RIVER AND NORTH OF A LINE FROM HURON TO SIOUX FALLS. THE STORMS WERE MOVING NORTH AT 25 MILES AN HOUR. SPRINGER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 12:20 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 25 min |
| Jun 20, 11:38 PM CDT | Severe Thunderstorm Warning | FSD | Pipestone | 52 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1989Severe Thunderstorm Warnings in Minnesota, 1989Every severe thunderstorm warning in 1989
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.