Alert archive / Iowa / Tornado Warnings in 1986
Tornado Warning 1, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Apr 4, 1986, 4:00 PM CST for Sac County, Iowa. It was in force for 40 min.
The area
The counties it named.
The facts
- Issued
- Apr 4, 1986, 4:00 PM CST (22:00 UTC)
- Expired
- Apr 4, 1986, 4:40 PM CST
- In force
- 40 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Sac 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, 10.0 hours before the alert went out and 158 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
- 3586 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 102 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 KDSM 042207 COR TORDSM IAC161-042240- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING...CORRECTION TO TIMES IN WARNING NATIONAL WEATHER SERVICE DES MOINES IA 400 PM CST FRI APR 4 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 440 PM CST FOR PEOPLE IN THE FOLLOWING COUNTY OF WEST CENTRAL IOWA...EASTERN SAC AT 355 PM..A FUNNEL CLOUD WAS REPORTED 5 TO 10 MILES NORTHWEST OF CARROLL..ALONG THE SAC-CARROLL COUNTY LINE. THE STORM WAS MOVING NORTH AT 35 MILES AN HOUR. THIS STORM WILL MOVE INTO THE LAKE VIEW AND SAC CITY AREAS BETWEEN 400 AND 430 PM THIS EVENING. IF A TORNADO APPROACHES..TAKE COVER IMMEDIATELY. A BASEMENT.. INTERIOR HALLWAY..OR A ROOM ON THE LOWEST FLOOR IS THE SAFEST PLACE IN MOST BUILDINGS. IF YOU ARE IN A MOBILE HOME OR AN AUTOMOBILE.. LEAVE AT ONCE. TAKE COVER IN A STORM SHELTER..OR LIE IN A NEARBY DITCH OR DEPRESSION. TRUETT/BARLOW
What forecasters said that day
The local office's own words before this tornado 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, Apr 4, 2:34 PM CST, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 235 PM CST FRI APR 4 1986 ...TORNADO WATCH FOR PARTS OF CENTRAL AND WESTERN IOWA UNTIL 8PM... AT 230 PM...NO SEVERE THUNDERSTORMS WERE INDICATED IN IOWA. THERE WERE A FEW SHOWERS AND THUNDERSHOWERS IN THE WEST-CENTRAL PART OF THE STATE..FROM 30 MILES EAST OF SIOUX CITY..TO 35 MILES NORTHEAST OF COUNCIL BLUFFS. THE HEAVIEST THUNDERSHOWER WAS LOCATED IN SHELBY COUNTY NEAR HARLAN. THE SHOWERS AND THUNDERSHOWERS WERE MOVING NORTH AT 35 MILES AN HOUR. BINGHAM
Special weather statement, Apr 4, 3:43 PM CST, 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 340 PM CST FRI APR 4 1986 ...TORNADO WATCH FOR PARTS OF CENTRAL AND WESTERN IOWA UNTIL 8PM... AT 330 PM...NO SEVERE THUNDERSTORMS WERE INDICATED IN IOWA. SHOWERS AND ISOLATED THUNDERSHOWERS..SOME WITH HEAVY RAINS..WERE DEVELOPING OVER THE WEST 1/3RD OF IOWA. THE HEAVIEST THUNDERSHOWERS WERE IN WEST CENTRAL IOWA..IN THE CARROLL AND DENNISON AREAS. THEe SHOWERS AND THUNDERSHOWERS WERE MOVING NORTH AT 35 MILES AN HOUR. COVERAGE AND INTENSITY HAD SHOWN SOME INCREASE. BINGHAM/BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 4:40 PM CST | Tornado Warning | DMX | Sac | 15 min |
Nearby
Tornado Warnings in Iowa, 1986Every tornado warning in 1986Tornadoes in 1986
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.