Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 91, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 27, 1986, 7:57 PM CDT for Howard County, Winneshiek County, Iowa. It was in force for 48 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 27, 1986, 7:57 PM CDT (00:57 UTC)
- Expired
- Jul 27, 1986, 8:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Howard County, IA, Winneshiek 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 27, 8:20 PM CDT | Thunderstorm Wind 52 | Winneshiek, 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 00:00Z, 1.0 hours before the alert went out and 209 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
- 521 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1215 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -34 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KALO 280100 COR SVRALO IAC005-089-189-280145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING..CORRECTION (WINNEBAGO SHOULD BE WINNESHIEK) NATIONAL WEATHER SERVICE WATERLOO IA 757 PM CDT SUN JUL 27 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHEAST IOWA...ALLAMAKEE...HOWARD AND WINNESHIEK AT 745 PM CDT RADAR SHOWED A LINE OF THUNDERSTORMS FROM 20 MILES TO 40 MILES NORTHEAST OF MASON CITY. THIS THUNDERSTORM WILL LIKELY PRODUCE WINDS IN EXCESS OF 60 MPH AND HAIL 3/4 INCH OR LARGER IN DIAMETER. REMEMBER..BESIDES LARGE HAIL AND DAMAGING WINDS..SEVERE THUNDERSTORMS CAN ALSO PRODUCE TORNADOES.
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 27, 4:05 PM CDT, 3 hours 52 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 405 PM CDT SUN JUL 27 1986 ...STRONG THUNDERSTORM RAPIDLY DEVELOPING OVER CENTRAL IOWA... BETWEEN 345 PM AND 4 PM A THUNDERSTORM DEVELOPED RAPIDLY OVER CENTRAL IOWA..OVER WESTERN SECTIONS OF THE DES MOINES METRO AREA. DUE TO THE RAPID DEVELOPMENT OF THE STORM..VERY HEAVY RAINS..WIND GUSTS OF 30 TO 40 MILES AN HOUR..AND SOME SMALL HAIL CAN BE EXPECTED. THE STORM WILL MOVE EAST..AND WILL MOVE ACROSS DES MOINES BETWEEN 405 PM AND 5 PM. IN ADDITION..MORE THUNDERSTORMS MAY RAPIDLY DEVELOP IN CENTRAL IOWA DURING THE NEXT FEW HOURS. RECREATIONAL INTERESTS..ESPECIALLY THOSE ON AREA LAKES..SHOULD KEEP A CLOSE WATC[H ON THE SKY AND BE READY TO MOVE TO A SAFE PLACE. TRUETT
Special weather statement, Jul 27, 5:39 PM CDT, 2 hours 18 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 540 PM CDT SUN JUL 27 1986 ..SEVERE THUNDERSTORM WATCH FOR MUCH OF CENTRAL AND NORTHERN IOWA UNTIL 11 PM.. ..NO SEVERE WEATHER WAS REPORTED BETWEEN 445 PM AND 530 PM.. AT 530 PM ISOLATED THUNDERSHOWERS CONTINUED IN CENTRAL IOWA. THEY WERE LOCATED IN A 40 MILE DIAMETER CIRCLE CENTERED ON MARSHALLTOWN. MARSHALLTOWN IS 30 MILES SOUTHWEST OF WATERLOO. THE SSHOWERS WERE MOVING EAST AT 35 MILES AN HOUR. OBRIEN
Special weather statement, Jul 27, 6:30 PM CDT, 1 hour 27 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 630 PM CDT SUN JUL 27 1986 ..SEVERE THUNDERSTORM WATCH FOR MUCH OF CENTRAL AND NORTHERN IOWA UNTIL 11 PM.. ..NO SEVERE WEATHER WAS REPORTED BETWEEN 530 PM AND 625 PM.. AT 625 PM ISOLATED THUNDERSHOWERS DEVELOPED IN NORTH CENTRAL IOWA ALONG THE MINNESOTA BORDER. OTHER STORMS WERE LOCATED FURTHER NORTH IN MINNESOTA. THE STORMS IN IOWA WERE 40 MILES NORTHEAST OF MASON CITY. THE STORMS WERE MOVING EAST AT 20 MILES AN HOUR. OBRIEN
Special weather statement, Jul 27, 7:33 PM CDT, 24 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 735 PM CDT SUN JUL 27 1986 ..SEVERE THUNDERSTORM WATCH FOR MUCH OF CENTRAL AND NORTHERN IOWA UNTIL 11 PM.. ..NO SEVERE WEATHER WAS REPORTED BETWEEN 625 PM AND 730 PM.. AT 730 PM ISOLATED THUNDERSTORMS WERE ENTERING NORTH CENTRAL IOWA FROM MINNESOTA. THE STORMS WERE LOCATED ALONG THE IOWA BORDER 40 TO 60 MILES NORTHEAST OF MASON CITY. THE STORMS WERE MOVING SOUTH AT 10 MILES AN HOUR. OBRIEN
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 7:57 PM CDT | Severe Thunderstorm Warning | DMX | Allamakee | 48 min |
| Jul 27, 8:53 PM CDT | Severe Thunderstorm Warning | DMX | Floyd | 62 min |
| Jul 27, 9:32 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Chickasaw | 58 min |
| Jul 28, 6:58 PM CDT | Severe Thunderstorm Warning | DMX | Dickinson | 62 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.