Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 30, 1987, 9:04 PM CDT for Monona County, Iowa. It was in force for 56 min. 1 report 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
- May 30, 1987, 9:04 PM CDT (02:04 UTC)
- Expired
- May 30, 1987, 10:00 PM CDT
- In force
- 56 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Monona 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 |
|---|---|---|---|
| May 30, 9:15 PM CDT | Thunderstorm Wind 52 | Monona, 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 00:00Z, 2.1 hours before the alert went out and 88 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
- 3536 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 86 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 310204 SVRSUX IAC133-310300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA 904 PM CDT SAT MAY 30 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF WEST CENTRAL IOWA... CENTRAL MONONA AT 858 PM RADAR SHOWED A SEVER THUNDERSTORM 35 MILES SOUTHEAST OF SIOUX CITY IN WEST CENTRAL MONONA COUNTY IOWA. THIS THUNDERSTORM WAS MOVING EAST AT 25 MILES AN HOUR. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. PEOPLE IN THE PATH OF THIS STORM SHOULD TAKE APPROPRIATE ACTION IMMEDIATELY. IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY. IF SEVERE WEATHER CONDITIONS ARE OBSERVED..PLEASE ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE. 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, May 30, 5:47 PM CDT, 3 hours 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 540 PM CDT SAT MAY 30 1987 AT 530 PM CDT....SCATTERED INTENSE THUNDERSTORMS...SOME WITH VERY HEAVY RAIN CONTINUED OVER NORTH CENTRAL AND NORTHEASTERN SOUTH DAKOTA... AND HAD DEVELOPED OVER NORTHERN NEBRASKA. THE STORMS WERE LOCATED 20 MILES EITHER SIDE OF A LINE FROM MOBRIDGE TO WATERTOWN. ANOTHER AREA OF STORMS WERE 30 MILES SOUTH OF A LINE FROM YANKTON TO VALENTINE NEBRASKA...40 MILES SOUTHWEST OF WINNER. THE STRONGEST STORMS WERE NORTHERN FAULK AND SPINK COUNTIES...NEAR CRESBARD AND NORTHVILLE. ANOTHER STRONG STORM WAS NEAR BUTTE NEBRASKA ...50 MILES SOUTHEAST OF WINNER. THESE STORMS MAY HAVE STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. MOVEMENT WAS EAST AT 5 MILES AN HOUR. EDDY
Special weather statement, May 30, 6:41 PM CDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 640 PM CDT SAT MAY 30 1987 AT 630 PM CDT....SCATTERED INTENSE THUNDERSTORMS...SOME WITH VERY HEAVY RAIN CONTINUED OVER NORTH CENTRAL AND NORTHEASTERN SOUTH DAKOTA... NORTHERN NEBRASKA...AND HAD MOVED INTO WESTERN MINNESOTA. THE STORMS WERE LOCATED 20 MILES NORTHEAST OF A LINE FROM MOBRIDGE TO HURON. ANOTHER AREA OF STORMS WERE SOUTH OF LINE FROM YANKTON TO VALENTINE NEBRASKA...40 MILES SOUTHWEST OF WINNER. THE STRONGEST STORMS IN SOUTH DAKOTA WERE IN SOUTHERN SPINK COUNTY... NEAR TULARE AND IN CENTRAL EDMUNDS COUNTY...NEAR ROSCOE. THESE STORMS MAY HAVE STRONG GUSTY WINDS...FREQUENT LIGHTNING AND SMALL HAIL. MOVEMENT WAS SOUTH AT 5 MILES AN HOUR. EDDY
Special weather statement, May 30, 7:36 PM CDT, 1 hour 28 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 730 PM CDT SAT MAY 30 1987 AT 730 PM CDT....SCATTERED INTENSE THUNDERSTORMS...SOME WITH VERY HEAVY RAIN CONTINUED OVER NORTH CENTRAL AND EAST CENTRAL SOUTH DAKOTA... NORTHERN NEBRASKA...AND WESTERN MINNESOTA. THE STORMS WERE LOCATED 30 MILES NORTHEAST OF A LINE FROM MOBRIDGE TO HURON. ANOTHER AREA OF STORMS WERE SOUTH OF LINE FROM YANKTON TO WINNER. THE STRONGEST STORMS IN SOUTH DAKOTA WERE IN SOUTHERN SPINK COUNTY... NEAR HITCHCOCK AND IN WESTERN MC PHERSON COUNTY...NEAR HILLSVIEW. THESE STORMS MAY HAVE STRONG GUSTY WINDS...FREQUENT LIGHTNING AND SMALL HAIL. MOVEMENT WAS SOUTH AT 5 MILES AN HO#UR. EDDY
Special weather statement, May 30, 7:42 PM CDT, 1 hour 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 740 PM CDT SAT MAY 30 1987 ...INTENSE THUNDERSTORMS ARE MOVING INTO DIXON COUNTY NEBRASKA... AT 735 PM RADAR SHOWED AN INTENSE THUNDERSTORM SOUTHWEST OF NEWCASTLE IN DIXON COUNTY NEBRASKA. ANOTHER STRONG THUNDERSTORM WAS NEAR WAYNE NEBRASKA. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN...PEA TO MARBLE SIZE HAIL AND WIND GUSTS TO 40 MILES AN HOUR. THE THUNDEERSTORMS ARE MOVING NORTHEAST AT 20 MILES AN HOUR. IF YOU ARE IN DIXON COUNTY NEBRASKA OR THE SOUTHWEST PART OF UNION COUNTY SOUTH DAKOTA...BE PREPARED TO MOVE TO A PLACE OF SAFETY. QUINN
Special weather statement, May 30, 8:46 PM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
842 PM CDT SAT MAY 30 1987
...INTENSE THUNDERSTORMS ARE MOVING INTO MONONA COUNTY IOWA...
AT 740 PM RADAR SHOWED AN INTENSE THUNDERSTORM WEST OF ONAWA IN
MONONA COUNTY IOWA...OR 35 MILES SOUTHEAST OF SIOUX CITY. THE MONONA
COUNTY SHERIFF REPORTED WIND GUSTS OF 50 TO 60 MILES AN HOUR AND PEA
SIZE HAIL. THIS THUNDERSTORM WAS MOVING EAST AT 25 MILES AN HOUR.
IF YOU ARE IN T{HE PATH OF THIS STORM MOVE TO A PLACE OF SAFETY IF
SEVERE WEATHER APPROACHES.
OTHER SHOWERS AND THUNDERSTORMS MOVING THROUGH THE SIOUXLAND AREA
WERE PRODUCING VERY HEAVY RAIN AND DANGEROUS LIGHTNING. TAKE COVER
TO AVOID THESE STORMS.
QUINNSpecial weather statement, May 30, 8:49 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT...CORRECTED TIME... NATIONAL WEATHER SERVICE SIOUX CITY IA 842 PM CDT SAT MAY 30 1987 ...INTENSE THUNDERSTORMS ARE MOVING INTO MONONA COUNTY IOWA... AT 840 PM RADAR SHOWED AN INTENSE THUNDERSTORM WEST OF ONAWA IN MONONA COUNTY IOWA...OR 35 MILES SOUTHEAST OF SIOUX CITY. THE MONONA COUNTY SHERIFF REPORTED WIND GUSTS OF 50 TO 60 MILES AN HOUR AND PEA SIZE HAIL. THIS THUNDERSTORM WAS MOVING EAST AT 25 MILES AN HOUR. IF YOU ARE IN THE PATH OF THIS STORM MOVE TO A PLACE OF SAFETY IF SEVERE WEATHER APPROACHES. OTHER SHOWERS AND THUNDERSTORMS MOVING THROUGH THE SIOUXLAND AREA WERE PRODUCING VERY HEAVY RAIN AND DANGEROUS LIGHTNING. TAKE COVER TO AVOID TH|ESE STORMS. QUINN
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.