Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 45, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1987, 2:08 AM CDT for Monona County, Iowa. It was in force for 37 min.
The area
The counties it named.
The facts
- Issued
- Jul 7, 1987, 2:08 AM CDT (07:08 UTC)
- Expired
- Jul 7, 1987, 2:45 AM CDT
- In force
- 37 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 7.1 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
- 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 070708
SVRSUX
IAC133-070745-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
208 AM CDT TUE JUL 7 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 245 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN WEST CENTRAL IOWA
...EASTERN MONONA
AT 208 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM OVER EASTERN
MONONA COUNTY NEAR SOLDIER IOWA...ABOUT 48 MILES SOUTHEAST OF SIOUX
CITY. THE STORM WAS MOVING NORTHEAST AT 30 MILES AN HOUR.
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
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
Special weather statement, Jul 7, 1:06 AM CDT, 1 hour 2 minutes 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
Local storm report, Jul 7, 1:43 AM CDT, 25 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
145 PM CDT TUE JUL 7 1987
1230 AM CDT RADIO STATION KVDB IN SIOUX CENTER IOWA(SIOUX COUNTY)
REPORTED POWER LINES DOWN IN HAYWARDEN IOWA.
1259 AM CDT RADIO STATION KVDB IN SIOUX CENTER IOWA(SIOUX COUNTY)
REPORTED A WIND GUST TO 67 MPH.
115 AM CDT HAIL COVERING THE GROUND AT SIOUX CENTER IOWA.
SIZE UNKNOWN. REPORT RECIEVED FROM STATION KVDB.
JANSENSpecial weather statement, Jul 7, 1:43 AM CDT, 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 145 AM CDT TUE JUL 7 1987 ...SEVERE THUNDERSTORM WATCH NUMBER 333 WAS CANCELED FOR SOUTHEAST SOUTH DAKOTA... THE NATIONAL WEATHER SERVICE HAS CANCELED THE SOUTH DAKOTA PORTION OF SEVERE THUNDERSTORM WATCH NUMBER 333. SCATTERED THUNDERSTORMS CONTINUED IN SOUTHEAST SOUTH DAKOTA...BUT SEVERE THUNDERSTORMS ARE NOW UNLIKELY. THE SEVERE THUNDERSTORMS WATCH REMAINS IN EFFECT AS EARLIER ISSUED IN THE ADJOINING AREAS OF SOUTHWEST MINNESOTA...NORTHWEST IOWA... AND NORTHEAST NEBRASKA. UMLAND
Local storm report, Jul 7, 1:59 AM CDT, 9 minutes before
STORM REPORT ... CORRECTION ...
NATIONAL WEATHER SERVICE SIOUX FALLS SD
155 AM CDT TUE JUL 7 1987
1230 AM CDT RADIO STATION KVDB IN SIOUX CENTER IOWA IN SIOUX COUNTY.
REPORTED POWER LINES DOWN IN HAYWARDEN IOWA.
1259 AM CDT RADIO STATION KVDB IN SIOUX CENTER IOWA IN SIOUX COUNTY.
REPORTED A WIND GUST TO 67 MPH. SEVERAL TREES DOWN AND
ROADS BLOCKED.
115 AM CDT HAIL COVERING THE GROUND AT ROCK VALLEY IOWA IN SIOUX
COUNTY...SIZE UNKNOWN. 2 INCHES OF RAIN. REPORTED BY KVDB
IN SIOUX CENTER IOWA.
BEHRENDSpecial weather statement, Jul 7, 2:01 AM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 150 PM CDT TUE JUL 7 1987 ...A THUNDERSTORM WATCH IS IN EFFECT FOR EXTREME SOUTHEAST SOUTH DAKOTA UNTIL 4AM CDT... AT 135 AM CDT...AN INTENSE THUNDERSTORM HAD MOVED INTO EXTREME NORTHWESTERN IOWA. IN SOUTH DAKOTA A THUNDERSTORM WITH VERY HEAVY RAIN WAS LOCATED 15 MILEA NORTHEAST OF WATERTOWN...OTHERWISE THUNDERSTORMS WITH HEAVY RAIN AT TIMES WERE LOCATED IN EASTERN SOUTH DAKOTA AND SOUTHWESTERN MINNESOTA. MOST OF THE THUNDERSTORMS WERE LOCATED EAST OF THE JAMES RIVER. MOVEMENT OF ALL STORMS WAS NORTHEAST AT 25 MILES AN HOUR. THE STORMS AREAL COVERAGE AND INTENSITIES WERE SHOWING A SLIGHT DECREASE OVER THE PAST HOUR. HUTCHEON
Special weather statement, Jul 7, 2:03 AM CDT, 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 202 AM CDT TUE JUL 7 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 4 AM CDT FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA BUT NO LONGER IN EFFECT FOR SOUTHEAST SOUTH DAKOTA... AT 155 AM CDT RADAR INDICATED INTENSE THUNDERSTORMS JUST EAST OF WORTHINGTON MINNESOTA IN EASTERN NOBLES COUNTY AND IN WESTERN OSCEOLA COUNTY OF NORTHWEST IOWA NEAR ASHTON IOWA. THESE STORMS ARE STILL CAPABLE OF PRODUCING SMALL HAIL...GUSTY WINDS AND HEAVY RAINS AS THEY MOVE EAST AT 25 MPH. OTHERWISE SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER EXTREME EASTERN SOUTH DAKOTA...NORTHWEST IOWA AND SOUTHWEST MINNESOTA. THE PRECIPITATION WAS GENERALLY EAST OF A LINE FROM NEAR WATERTOWN SOUTH DAKOTA...SOUTHWEST TO NEAR SALEM TO JUST EAST OF YANKTON SOUTH DAKOTA. JANSEN
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 | Monona, Woodbury | 53 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 |
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; the sounding from the Mesonet's radiosonde archive.