Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 41, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1987, 1:07 AM CDT for Monona County, Woodbury County, Iowa. It was in force for 53 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
- Jul 7, 1987, 1:07 AM CDT (06:07 UTC)
- Expired
- Jul 7, 1987, 2:00 AM CDT
- In force
- 53 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Monona 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 |
|---|---|---|---|
| Jul 7, 1:20 AM CDT | Thunderstorm Wind 60 | 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 00:00Z, 6.1 hours before the alert went out and 105 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
- 3581 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 112 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 070607
SVRSUX
IAC149-133-193-070700-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
107 AM CDT TUE JUL 7 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 200 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHWEST IOWA
...PLYMOUTH
IN WEST CENTRAL IOWA
...MONONA...WOODBURY
AT 105 AM CDT RADAR INDICATED SEVERE THUNDERSTORMS HAD RAPIDLY FORMED
OVER PLYMOUTH...WOODBURY AND MONONA COUNTIES IN WESTERN IOWA. THESE
THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNbING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
SHERLINWhat 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
Local storm report, Jul 7, 12:22 AM CDT, 45 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1220 PM CDT TUE JUL 7 1987
949 PM CDT PEA SIZE HAIL AND HEAVY RAIN NEAR MITCHELL SOUTH DAKOTA.
(DAVISON COUNTY)
1007 PM CDT GUST TO 41 MPH AT THE SIOUX FALLS AIRPORT.
(MINNEHAHA COUNTY)
1155 PM CDT 52 MPH WINDS AT VERMILLION SOUTH DAKOTA.
(CLAY COUNTY)
1217 AM CDT PEA TO MARBLE SIZE HAIL COVERING GROUND AT BERESFORD
SOUTH DAKOTA. (pLINCOLN COUNTY)
JANSENLocal storm report, Jul 7, 12:23 AM CDT, 44 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1220 AM CDT TUE JUL 7 1987
949 PM CDT PEA SIZE HAIL AND HEAVY RAIN NEAR MITCHELL SOUTH DAKOTA.
(DAVISON COUNTY)
1007 PM CDT GUST TO 41 MPH AT THE SIOUX FALLS AIRPORT.
(MINNEHAHA COUNTY)
1155 PM CDT 52 MPH WINDS AT VERMILLION SOUTH DAKOTA.
(CLAY COUNTY)
1217 AM CDT PEA TO MARBLE SIZE HAIL COVERING GROUND AT BERESFORD
SOUTH DAKOTA. (qLINCOLN COUNTY)
JANSENSpecial weather statement, Jul 7, 12:45 AM CDT, 22 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1243 AM CDT TUE JUL 7 1987 ...VERU STRONG THUNDERSTORMS MOVING ACROSS UNION COUNTY SOUTH DAKOTA... AT 1240 AM CDT RADAR INDICATED VERY STRONG THUNDERSTORMS MOVING ACROSS UNION COUNTY SOUTH DAKOTA...ABOUT 20 TO 45 MILES NORTHWEST OF SIOUX CITY. THESE THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR. THESE THUNDERSTORMS WILL PRODUCE PEA TO MARBLE SIZE HAIL...HEAVLY RAIN SHOWER AND STRONG GUSTY WINDS. RESIDENTS OF UNION COUNTY SOUTH DAKOTA SHOULD BE ON THE LOOKOUT FOR ANY SEVERE WEATHER AND TAKE SHELTER IMMEDIATELY IF IT IS OBSERVED. SHERLIN
Special weather statement, Jul 7, 12:56 AM CDT, 11 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1255 AM CDT TUE JUL 7 1987 ...VERY STRONG THUNDERSTORMS MOVING INTO WESTERN IOWA... AT 1250 AM CDT RADAR INDICATED A LINE OF VERY STRONG THUNDERSTORMS WAS MOVING INTO WESTERN IOWA. THESE STORMS EXTENDED ALL THE WAY FROM THE EXTREME NORTHWEST CORNER OF IOWA SOUTHWARD INTO MONONA COUNTY...ABOUT 45 MILES SOUTHEAST OF SIOUX CITY. THESE THUNDERSTORMS WILL PRODUCE PEA TO MARBLE SIZE HAIL. WIND GUSTS TO AROUND 50 MILES AN HOUR...DANGEROUS LIGHTNING AND HEAVY SHOWERS. RESIDENTS OF SIOUX...PLYMOUTH...WOODBURY AND MONONA COUNTIES IN WESTERN IOWA SHOULD BE ON THE LOOKOUT FOR THESE VERY STRONG STORMS AND TAKE SHTELTER IF SEVERE WEATHER IS OBSERVED. SHERLIN
Special weather statement, Jul 7, 1:04 AM CDT, 3 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 1250 PM CDT TUE JUL 7 1987 ...A THUNDERSTORM WATCH IS IN EFFECT FOR EXTREME SOUTHEAST SOUTH DAKOTA UNTIL 4AM CDT... AT 1240 AM CDT...AN INTENSE THUNDERSTORM WITH VERY HEAVY RAIN WAS IN EXTREME SOUTHEASTERN SOUTH DAKOTA. THE THUNDERSTORM WAS LOCATED 30 MILES SOUTH OF SIOUX FALLS. ELSEWHERE INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN COUNTINUED OVER EASTERN SOUTH DAKOTA AND SOUTHWESTERN MINNESOTA. THESE STORMS WERE LOCATED EAST OF THE JAMES RIVER FROM THE NORTH DAKOTA BORDER TO HURON AND SOUTHEAST OF A LINE FROM HURON TO MISSION...ABOUT 35 MILES WEST OF WINNER. MOVEMENT OF ALL STORMS WAS NORTHEAST AT 25 MILES AN HOUR. LARGE HAIL...DAMAGING WIND...VERY HEAVY RAINS...AND FREQUENT LIGHTNING ARE POSSIBLE WITH THESE STORMS. IF THREATENING WEATHER APPROACHES YOU SEEK SHELTER. HUTCHEON
Special weather statement, Jul 7, 1:06 AM CDT, 1 minute before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 1250 PM CDT TUE JUL 7 1987 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR EXTREME SOUTHEAST SOUTH DAKOTA UNTIL 4AM CDT... AT 1240 AM CDT...AN INTENSE THUNDERSTORM WITH VERY HEAVY RAIN WAS IN EXTREME SOUTHEASTERN SOUTH DAKOTA. THE THUNDERSTORM WAS LOCATED 30 MILES SOUTH OF SIOUX FALLS. ELSEWHERE INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN COUNTINUED OVER EASTERN SOUTH DAKOTA AND SOUTHWESTERN MINNESOTA. THESE STORMS WERE LOCATED EAST OF THE JAMES RIVER FROM THE NORTH DAKOTA BORDER TO HURON AND SOUTHEAST OF A LINE FROM HURON TO MISSION...ABOUT 35 MILES WEST OF WINNER. MOVEMENT OF ALL STORMS WAS NORTHEAST AT 25 MILES AN HOUR. LARGE HAIL...DAMAGING WIND...VERY HEAVY RAINS...AND FREQUENT LIGHTNING ARE POSSIBLE WITH THESE STORMS. IF THREATENING WEATHER APPROACHES YOU SEEK SHELTER. HUTCHEON
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 12:33 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 57 min |
| Jul 7, 1:00 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola, Sioux | 60 min |
| Jul 7, 1:07 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 53 min |
| Jul 7, 1:27 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien | 63 min |
| Jul 7, 1:46 AM CDT | Severe Thunderstorm Warning | FSD | Ida | 59 min |
| Jul 7, 2:08 AM CDT | Severe Thunderstorm Warning | FSD | Monona | 37 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.