Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 69, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 8, 1986, 8:25 PM CDT for Poweshiek County, Iowa. It was in force for 22 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1986, 8:25 PM CDT (01:25 UTC)
- Expired
- Jul 8, 1986, 8:47 PM CDT
- In force
- 22 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Poweshiek 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
Peoria Regional, IL (KPIA), launched 00:00Z, 1.4 hours before the alert went out and 270 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
- 1445 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 1379 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 7.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 090127 SVRDSM IAC157-090200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 825 PM CDT TUE JUL 8 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL IOWA...SOUTHEAST HALF OF POWESHIEK. AT 820 PM CDT RADAR AT THE NATIONAL WEATHER SERVICE IN DES MOINES INDICATED A SEVERE STORM MOVING SOUTHEAST AT 30 MILES AN HOUR MOVING ACROSS POWESHIEK COUNTY. AT 820 PM CDT AN OBSERVER AT HARTWICK REPORTED WINDS OF UP TO 60 MPH. HARTWICK IS 40 MILES EAST OF IOWA CITY. TOWNS AND CITIES THAT ARE MOST VULNERABLE TO THIS STORM INCLUDE BROOKLYN AND MONTEZUMA. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. PEOPLE IN THE PATH OF THIS STORM SHOULD TAKE APPROPRIATE ACTION IMMEDIATELY. DOWD/MS
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, 2:42 PM CDT, 5 hours 43 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, 4 hours 44 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, 3 hours 43 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
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:08 PM CDT | Severe Thunderstorm Warning | DMX | Audubon | 37 min |
| Jul 8, 7:28 PM CDT | Severe Thunderstorm Warning | DMX | Guthrie | 36 min |
| Jul 8, 9:05 PM CDT | Tornado Warning | DMX | Poweshiek | 25 min |
| Jul 8, 9:39 PM CDT | Tornado Warning | DMX | Ringgold, Taylor | 26 min |
| Jul 8, 10:31 PM CDT | Tornado Warning | DMX | Decatur | 29 min |
| Jul 8, 10:45 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Monroe | 30 min |
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; the sounding from the Mesonet's radiosonde archive.