Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 66, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 8, 1986, 6:39 PM CDT for Black Hawk County, Iowa. It was in force for 51 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 8, 1986, 6:39 PM CDT (23:39 UTC)
- Expired
- Jul 8, 1986, 7:30 PM CDT
- In force
- 51 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Black Hawk 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 8, 6:45 PM CDT | Thunderstorm Wind 52 | Black Hawk, 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
Minneapolis, MN (KSTC), launched 12:00Z, 11.7 hours before the alert went out and 284 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
- 790 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.9
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What 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 8, 1:50 PM CDT, 4 hours 49 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1 45PM CDT TUE JUL 8 1986 AT 130 PM CDT...NO SEVERE WEATHER HAD BEEN REPORTED IN IOWA. SCOTT
Special weather statement, Jul 8, 2:42 PM CDT, 3 hours 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 2 35PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHWEST AND NORTH CENTRAL IOWA UNTIL 7PM THIS EVENING. AT 230 PM CDT...NO SEVERE WEATHER HAD BEEN REPORTED IN IOWA..HOWEVER A FEW SHOWERS AND THUNDERSHOWERS HAD ENTERED EXTREME NORTHWEST IOWA AND WERE LOCATED NEAR SIOUX CENTER..ABOUT 35 MILES SOUTHEAST OF SIOUX FALLS. HEAVIER THUNDERSTORMS WERE LOCATED IN SOUTHWEST AND SOUTH CENTRAL MINNESOTA..AND IN NORTHEAST NEBRASKA. THESE THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT 30 MILES AN HOUR.. AND WILL BE ENTERING IOWA NEAR SPIRIT LAKE..AND ALSO NEAR SIOUX CITY. | SCOTT
Special weather statement, Jul 8, 3:41 PM CDT, 2 hours 58 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 339 PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHWEST AND NORTH CENTRAL IOWA UNTIL 7PM THIS EVENING. NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 235 AND 335 PM CDT. AT 331 PM CDT... SCATTERED SHOWERS AND THUNDERSTORMS WERE LOCATED OVER EXTREME NORTHWEST IOWA. THEY WERE GENERALLY BETWEEN SIOUX CITY AND THE SPENCER AREA. A VERY STRONG STORM WAS LOCATED OVER NORTHEAST NEBRASKA. THIS STORM WILL MOVE INTO THE ONAWA AREA OF WEST CENTRAL IOWA BY 400 PM. THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR. SCHUMACHER
Special weather statement, Jul 8, 4:42 PM CDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 438 PM CDT TUE JUL 8 1986 A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF NORTHWEST AND NORTH CENTRAL IOWA UNTIL 7PM THIS EVENING. NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 335 AND 435 PM CDT. AT 434 PM CDT... VERY STRONG THUNDERSTORMS WERE OCCURRING OVER NORTH CENTRAL..NORTHWEST AND PARTS OF WEST CENTRAL IOWA. THE STRONGEST STORMS WERE IN A 20 MILE WIDE AREA EXTENDING FROM 30 MILES SOUTHEAST OF SIOUX CITY..TO NEAR SPENCER..THEN EAST TO JUST NORTH OF MASON CITY. THESE STORMS WILL PRODUCE VERY HEAVY RAIN..GUSTY WINDS AND POSSIBLY SOME SMALL HAIL. ELSEWHERE..A FEW THUNDERSHOWERS HAD DEVELOPED OVER EAST CENTRAL IOWA. THEY WERE IN AND JUST NORTH OF CEDAR RAPIDS. THE STORMS WERE ALL MOVING EAST AT 30 MILES AN HOUR. BOTH AREAL COVERAGE AND INTENSITY WERE INCREASING. SCHUMACHER
Nearby
Severe Thunderstorm Warnings in Iowa, 1986Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.