Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 30, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 1987, 6:11 PM CDT for Monona County, Woodbury County, Iowa. It was in force for 64 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 5, 1987, 6:11 PM CDT (23:11 UTC)
- Expired
- Jul 5, 1987, 7:15 PM CDT
- In force
- 64 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 5, 6:20 PM CDT | Tornado F0 | 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 12:00Z, 11.2 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
- 3609 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 49 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 052311
SVRSUX
IAC133-193-060015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
611 PM CDT SUN JUL 5 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 715 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN WEST CENTRAL IOWA
...WESTERN MONONA...WEST CENTRAL WOODBURY
AT 700 PM CDT RADAR CONTINUED TO SHOW SEVERE THUNDERSTORMS IN WESTERN
MONONA AND WESTERN AND CENTRAL WOODBURY COUNTIES.
THESE STORMS WERE MOVING NORTHEAST AT 20 TO 25 MILES AN HOUR.
THE SEVERE THUNDERSTORM WARNING FOR THESE AREAS HAS BEEN EXTENDED.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...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.D
KROPPWhat 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 5, 1:31 PM CDT, 4 hours 40 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 130 PM CDT SUN JUL 5 1987 ...STRONG THUNDERSTORMS AND HEAVY RAIN IN CHEROKEE AND OBRIEN COUNTIES IN IOWA... AT 125 PM CDT RADAR SHOWED TWO STRONG THUNDERSTORMS IN NORTHWEST IOWA. THE FIRST WAS 50 MILES NORTHEAST OF SIOUX CITY IN WESTERN OBRIEN COUNTY 15 MILES WEST OF PRIMGHAR IOWA. THE SECOND WAS 40 MILES NORTHEAST OF SIOUX CITY OR 5 MILES WEST OF CHEROKEE IOWA. THESE STORMS WERE MOVING TO THE NORTH NORTHEAST AT 20 MILES AN HOUR. THESE STORMS ARE CAPABLE OF PRODUCING HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS. PEOPLE IN NORTHERN CHEROKEE AND OBRIEN COUNTIES SHOULD BE ALERT AS THESE THUNDERSTORMS MOVE THROUG`H THE AREA. ROSNER
Special weather statement, Jul 5, 2:11 PM CDT, 4 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 210 PM CDT SUN JUL 5 1987 AT 2 PM CDT...THUNDERSTORMS CONTINUED TO DEVELOP OVER NORTHWEST IOWA AND WERE NOW DEVELOPING IN EXTREME SOUTHWEST MINNESOTA. THEY WERE IN AN AREA 30 MILES WIDE FROM 20 MILES SOUTHEAST OF SIOUX CITY IOWA TO 15 MILES NORTHEAST OF WORTHINGTON MINNESOTA. THE HEAVIEST STORMS WERE 25 MILES EAST OF SIOUX CITY IOWA NEAR CORRECTIONVILLE IOWA...NORTH OF CHERuOKEE IOWA...NEAR SANBORN IOWA AND 10 MILES EAST OF WORTHINGTON MINNESOTA. THESE STORMS MAY PRODUCE HEAVY RAIN...STRONG WINDS...SMALL HAIL AND DANGEROUS LIGHTNING. MOVEMENT WAS NORTHEAST AT 25 MPH. BLAIR
Special weather statement, Jul 5, 2:13 PM CDT, 3 hours 58 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 210 PM CDT SUN JUL 5 1987 ...STRONG THUNDERSTORMS IN NORTHWEST IOWA... AT 205 PM CDT RADAR SHOWED A 30 MILE WIDE BAND OF THUNDERSTORMS OVER NORTHWEST IOWA. THIS BAND EXTENDED FROM 90 MILES NORTHEAST OF SIOUX CITY TO 40 MILES EAST OF SIOUX CITY. THE STRONGEST THUNDERSTORM WAS LOCATED 45 MILES NORTHEAST OF SIOUX CITY OR NEAR CHEROKEE IOWA. THIS THUNDERSTORM HAD PRODUCED PEA TO MARBLE SIZE HAIL AS IT MOVED THROUGH CHEROKEE. THESE STORMS WERE MOVING TO THE NORTHEAST AT 25 MILES AN HOUR. THESE STORMS ARE CAPABLE OF PRODUCING HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS. PEOPLE IN NORTHERN CHEROKEE AND OBRIEN COUNTIES SHOULD BE ALERT AS THESE THUNDERSTORMS MOVE THROUGH THE AREA AND BE PREPARED TO TAKE COVER IF NEEDED. ROSNER
Special weather statement, Jul 5, 3:11 PM CDT, 3 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 310 PM CDT SUN JUL 5 1987 AT 3 PM CDT...STRONG THUNDERSTORMS CONTINUED OVER NORTHWEST IOWA AND EXTREME SOUTHWEST MINNESOTA. THEY WERE IN AN AREA 40 MILES WIDE FROM 30 MILES EAST OF SIOUX CITY IOWA TO MOUNTAIN LAKE MINNESOTA...WHICH IS ABOUT 50 MILES SOUTHWEST OF MANKATO. THESE STORMS HAVE BEEN DROPPING HEAVY RAIN AND PEA TO MARBLE SIZE HAIL AND MAY ALSO PRODUCE GUSTY WINDS AND DANGEROUS LIGHTNING. THE STRONGEST STORMS IN IOWA WERE NORTHEAST OF LE MARS...NEAR SIBLEY... NEAR SANBORN AND OVER LAKE PARK. IN MINNESOTA THE STONGEST STORMS WERE NEAR LAKEFIELD AND OVER WINDOM. MOVEMENT WAS NORTHEAST AT 20 MPH. BLAIR
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 5:05 PM CDT | Severe Thunderstorm Warning | FSD | Monona, Woodbury | 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.