Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 84, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 11, 1987, 3:58 PM CDT for Sioux County, Iowa. It was in force for 62 min.
The area
The counties it named.
The facts
- Issued
- Jul 11, 1987, 3:58 PM CDT (20:58 UTC)
- Expired
- Jul 11, 1987, 5:00 PM CDT
- In force
- 62 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Sioux 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 12:00Z, 9.0 hours before the alert went out and 197 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
- 3653 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 87 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 KFSD 112058
SVRFSD
IAC167-112200-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
358 PM CDT SAT JUL 11 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 500 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN NORTHWEST IOWA
...SIOUX
SOME CITIES EFFECTED ARE SIOUX CENTER AND HULL.
AT 400 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES WEST OF
SIOUX CENTER IOWA MOVING EAST NORTHEAST AT 25 MPH. LARGE HAIL AND
STRONG GUSTY WINDS CAN BE EXPECTED WITH THIS STORM.{ Basis }
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
KOSCIELSKIWhat 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 11, 3:14 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 315 PM CDT SAT JUL 11 1987 AT 305 PM CDT RADAR INDICATED 2 INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN OVER SIOUX COUNTY IOWA. THE STRONGEST WAS LOCATED 7 MILES EAST OF SIOUX CENTER IOWA AND THE OTHER WAS LOCATED 12 MILES SOUTHWEST OF SIOUX CENTER. THE STORMS WERE MOVING TO THE EAST AT 25 MPH. PEOPLE IN THE PATH OF THESE STORMS SHOULD BE ON THE LOOKOUT FOR POSSIBLE SEVERE WEATHER IN THE FORM OF LARGE HAIL AND STRONG GUSTY WINDS. KOSCIELSKI
Special weather statement, Jul 11, 3:38 PM CDT, 20 minutes before
^DSMSPSSUX SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 335 PM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WATCH UNTIL 9PM CDT THIS SATUDAY NIGHT... AT 330 PM CDT SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED IN A 30 MILE WIDE LINE FROM 90 MILES NORTHEAST OF SIOUX CITY IOWA TO COLUMBUS NEBRASKA. THE STRONGEST STORMS WERE 5 MILES SOUTHEAST OF HAWARDEN IOWA OR 45 MILES NORTH OF SIOUX CITY AND 5 MILES EAST OF SHELDON IOWA 60 MILES NORTHEAST OF SIOUX CITY. THESE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR. PEOPLE IN NORTHERN OBRIEN COUNTY AND SIOUX COUNTY IN IOWA SHOULD REMAIN ALERT AND BE PREPARED TO TAKE COVER IF SEVERE WEATHER IS OBSERVED. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL...STRONG GUSTY WIND... DANGEROUS LIGHTNING AND VERY HEAVY RAIN. ROSNER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 4:06 AM CDT | Severe Thunderstorm Warning | FSD | Lyon | 54 min |
| Jul 11, 5:00 PM CDT | Severe Thunderstorm Warning | FSD | Osceola, Sioux | 30 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.