Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 18, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 24, 1987, 6:37 PM CDT for Plymouth County, Woodbury County, Iowa. It was in force for 68 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 24, 1987, 6:37 PM CDT (23:37 UTC)
- Expired
- Jun 24, 1987, 7:45 PM CDT
- In force
- 68 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Plymouth County, IA, Woodbury County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 24, 6:37 PM CDT | Thunderstorm Wind 58 | Woodbury, IA | |
| Jun 24, 7:10 PM CDT | Thunderstorm Wind 50 | Woodbury, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.6 hours before the alert went out and 140 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
- 3614 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSUX 242337
SVRSUX
IAC149-193-250045-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
637 PM CDT WED JUN 24 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHWEST IOWA
...PLYMOUTH
IN WEST CENTRAL IOWA
...WOODBURY
AT 637 PM CDT WINDS GUSTS OF 60 MILES AN HOUR WERE RECORDED AT THE
SIOUX CITY AIRPORT.
THESE STORMS WERE MOVING TO THE EAST AT 30 MILES AN HOUR.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.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 24, 3:36 PM CDT, 3 hours 1 minute before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 335 PM CDT WED JUN 24 1987 ...THUNDERSTORMS FORMING AROUND SIOUXLAND... AT 330 PM CDT TWO LARGE THUNDERSTORMS WERE BUILDING OVER SOUTHERN WOODBURY AND NORTHERN MONONA COUNTIES. MOVEMENT WAS TO THE EAST AT ABOUT 25 MILES AN HOUR. THUNDERSTORMS ARE NOW BEGINNING TO BUILD ACROSS THE SIOUXLAND AREA AND SOME OF THESE STORMS MAY DEVELOP LATER INTO SEVERE THUNDERSTORMS. PERSONS ACROSS THE SIOUXLAND AREA SHOULD BE ON THE ALERT FOR THE FORMATION OF SEVERE WEATHER AND TAKE SHELTER IF OBSERVED. IF ANY SEVERE WEATHER IS OBSERVED PLEASE RELAY REPORTS TO LOCAL LAW OR CIVIL DEFENSE AGENCIES FOR RELAY TO THE NATIONAL WEATHER SnERVICE. SHERLIN
Special weather statement, Jun 24, 3:39 PM CDT, 2 hours 58 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 335 PM CDT WED JUN 24 1987.........CORRECTION FOR LOCATION... ...THUNDERSTORMS FORMING AROUND SIOUXLAND... AT 330 PM CDT TWO LARGE THUNDERSTORMS WERE BUILDING OVER SOUTHERN WOODBURY AND NORTHERN MONONA COUNTIES...ABOUT 20 MILES SOUTH OF SIOUX CITY. MOVEMENT WAS TO THE EAST AT ABOUT 25 MILES AN HOUR. THUNDERSTORMS ARE NOW BEGINNING TO BUILD ACROSS THE SIOUXLAND AREA AND SOME OF THESE STORMS MAY DEVELOP LATER INTO SEVERE THUNDERSTORMS. PERSONS ACROSS THE SIOUXLAND AREA SHOULD BE ON THE ALERT FOR THE FORMATION OF SEVERE WEATHER AND TAKE SHELTER IF OBSERVED. IF ANY SEVERE WEATHER IS OBSERVED PLEASE RELAY REPORTSp TO LOCAL LAW OR CIVIL DEFENSE AGENCIES FOR RELAY TO THE NATIONAL WEATHER SERVICE. SHERLIN
Special weather statement, Jun 24, 5:12 PM CDT, 1 hour 25 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 510 PM CDT WED JUN 24 1987 ...STRONG THUNDERSTORMS CONTINUE IN MONONA COUNTY IOWA... AT 500 PM CDT STRONG THUNDERSTORMS CONTINUED IN CENTRAL AND WESTERN MONONA COUNTY IN IOWA OR 25 MILES SOUTHEAST OF SIOUX CITY. THESE STORMS CONTINUED TO MOVE TO THE EAST AT 20 MILES AN HOUR. ALSO INTENSE THUNDERSTORMS CONTINUED IN EASTERN NEBRASKA FROM YANKTON SOUTH DAKOTA TO JUST WEST OF NORFOLK NEBRASKA TO 15 MILES NORTHWEST OF GRAND ISLAND NEBRASKA. THESE STORM WERE MOVING TO THE EAST AT 30 MILES AN HOUR. PERSONS ACROSS THE SIOUXLAND AREA SHOULD BE ON THE ALERT FOR THE FORMATION OF SEVERE WEATHER AND TAKE SHELTER IF OBSERVED. IF ANY SEVERE WEATHER IS OBSERVED PLEASE RELAY REPORTS TO LOCAL LAW ENFORCEMENT OFFICE OR CIVIL DEFENSE AGENCIES FOR RELAY TO THE NATIONAL WEATHER SERVICE. ROSNER
Special weather statement, Jun 24, 5:48 PM CDT, 49 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 535 PM CDT WED JUN 24 1987 AT 530 PM CDT...SCATTERED VERY HEAVY THUNDERSTORMS CONTINUED OVER PARTS OF SOUTHEAST SOUTH DAKOTA...NORTHEAST NEBRASKA...SOUTHWEST MINNESOTA AND INTO NORTHWEST IOWA. THESE STORMS WERE MOSTLY SOUTHEAST OF A LINE FROM CLEAR LAKE TO PICKSTOWN WITH THE HEAVIEST STORMS LOCATED 15 MILES NORTHEAST AND JUST WEST OF SIOUX FALLS...10 MILES WEST OF CENTERVILLE AND JUST NORTH OF YANKTON. THE STORMS OVER THE SOUTHEAST CORNER OF SOUTH DAKOTA COULD PRODUCE VERY HEAVY RAIN...HAIL AND GUSTY WINDS. PERSONS IN THE SIOUX FALLS AREA AND SOUTHWARD INTO THE SOUTHEAST CORNER OF THE STATE SHOULD BE ALERT FOR THREATENING WEATHER CONDITIONS AS THESE STORMS MOVE THROUGH. MOVEMENT WAS EAST AT 30 MILES AN HOUR. PFEIFFER
Special weather statement, Jun 24, 6:01 PM CDT, 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 555 PM CDT WED JUN 24 1987 AT 550 PM CDT...SHOWERS AND THUNDERSTORMS...SOME OF THEM INTENSE WITH VERY HEAVY RAIN...STRONG WINDS AND POSSIBLE HAILL...CONTINUED OVER PARTS OF SOUTHEAST SOUTH DAKOTA...SOUTHWEST MINNESOTA...NORTHWEST IOWA AND NORTHEAST NEBRASKA. THE SHOWERS AND THUNDERSTORMS WERE SCATTERED IN A 100 MILE WIDE AREA FROM ABOUT 110 MILES SOUTHWEST OF SIOUX FALLS...NEAR MADISON NEBRASKA TO ABOUT 90 MILES NORTHEAST OF SIOUX FALLS...NEAR GRANITE FALLS MINNESOTA. THE MOST INTENSE THUNDERSTORMS WERE IN A 25 MILE WIDE AREA FROM 15 MILES NORTHEAST OF SIOUX FALLS NEAR GARRISON SOUTH DAKOTA TO 75 MILES SOUTHWEST OF SIOUX FALLS NEAR RANDOLPH NEBRASKA. PEOPLE THROUGHOUT SOUTHEAST SOUTH DAKOTA...SOUTHWEST MINNESOTA AND NORTHWEST IOWA SHOULD BE ALERT UNTIL 8 PM CDT FOR INTENSE THUNDERSTORMS PRODUCING VERY HEAVY RAIN...HAIL AND STRONG GUSTY WINDS OF 40 TO 50 MPH AT 539 PM CDT THUNDERSTORMS PRODUCED WIND GUSTS OF 47 MPH AT SIOUX FALLS. BEHREND
Special weather statement, Jun 24, 6:06 PM CDT, 31 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 605 PM CDT WED JUN 24 1987 ...TORNADO WATCH FOR THE SIOUXLAND AREA UNTIL 1100 PM CDT TONIGHT... AT 600 PM CDT STRONG THUNDERSTORMS CONTINUED IN MONONA COUNTY IN IOWA. THESE STORM EXTENDED FROM 40 MILES SOUTHEAST OF SIOUX CITY TO 50 MILES SOUTH OF SIOUX CITY. THEY WERE MOVING TO THE EAST AT 25 MILES AN HOUR. INTENSE THUNDERSTORMS CONTINUED IN EASTERN NEBRASKA FROM YANKTON SOUTH DAKOTA TO 30 MILES WEST OF SIOUX CITY TO JUST WEST OF COLUMBUS NEBRASKA. THESE STORM WERE MOVING TO THE EAST AT 30 MILES AN HOUR. NO SEVERE WEATHER HAD BEEN REPORTED IN THE SIOUXLAND AREA AS OF 600 PM CDT. PERSONS ACROSS THE SIOUXLAND AREA SHOULD BE ON THE ALERT FOR THE FORMATION OF SEVERE WEATHER AND TAKE SHELTER IF OBSERVED. IF ANY SEVERE WEATHER IS OBSERVED PLEASE RELAY REPORTS TO LOCAL LAW ENFORCEMENT OFFICE OR CIVIL DEFENSE AGENCIES FOR RELAY TO THE NATIONAL WEATHER SERVICE.] ROSNER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 3:11 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 91 min |
| Jun 24, 6:46 PM CDT | Tornado Warning | FSD | Woodbury | 29 min |
| Jun 24, 6:55 PM CDT | Severe Thunderstorm Warning | FSD | Monona | 55 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1987Every severe thunderstorm warning in 1987
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.