Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 71, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 12, 1986, 1:29 AM CDT for Clarke County, Iowa. It was in force for 46 min.
The area
The counties it named.
The facts
- Issued
- Jul 12, 1986, 1:29 AM CDT (06:29 UTC)
- Expired
- Jul 12, 1986, 2:15 AM CDT
- In force
- 46 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Clarke 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 00:00Z, 6.5 hours before the alert went out and 219 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
- 3578 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 81 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 120629 SVRDSM IAC039-120715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 129 AM CDT SAT JUL 12 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTH CENTRAL IOWA...NORTHERN CLARKE AT 120 AM..DES MOINES WEATHER RADAR INDICATED A SEVERE THUNDER- STORM IN NORTHWEST CLARKE COUNTY OF SOUTH CENTRAL IOWA..OR ABOUT 25 TO 30 MILES SOUTH SOUTHWEST OF DES MOINES. THE STORM WAS MOVING EAST AROUND 30 MILES AN HOUR AND WILL MOVE ACROSS THE NORTHERN HALF OF CLARKE COUNTY AND INTO OSCEOLA BY 140 AM. 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. IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY. IF SEVERE WEATHER CONDITIONS ARE OBSERVED..PLEASE #ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE. MYERS
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 11, 11:39 PM CDT, 1 hour 50 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1135 PM CDT FRI JUL 10 1986 ...SEVERE THUNDERSTORM WATCH FOR SOUTHWEST IOWA TILL 5 AM CDT... NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA SINCE 1100 PM. AT 1130 PM CDT... A STRONG THUNDERSTORM WAS INDICATED IN WEST CENTRAL IOWA ALONG THE MISSOURI RIVER NEAR MONDAMIN..WHICH IS 35 MILES NORTH OF COUNCIL BLUFFS. THIS STORM WAS MOVING EAST AT 35 MILES AN HOUR. ISOLATED THUNDERSHOWERS WERE LOCATED IN NORTHEAST IOWA 45 MILES NORTH- WEST OF DUBUQUE NEAR ELKADER AND OVER EAST CENTRAL IOWA 30 MILES NORTH- WEST OF DAVENPORT NEAR TIPTON. THESE THUNDERSTORMS WERE MOVING EAST AT 20 MILES AN HOUR. FE)RRY
Special weather statement, Jul 12, 1:11 AM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1235 AM CDT SAT JUL 12 1986 ...SEVERE THUNDERSTORM WATCH FOR SOUTHWEST IOWA TILL 5 AM CDT... NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA SINCE 1130 PM. AT 1235 PM CDT... AN INTENSE THUNDERSTORM WAS INDICATED OVER SOUTHWEST IOWA 20 MILES NORTHEAST OF COUNCIL BLUFFS. THIS STORM WILL PRODUCE VERY HEAVY RAIN AND POSSIBLE SOME LARGE HAIL AND HIGH WINDS AS IT MOVES EAST AT 30 MILES AN HOUR. THIS STORM SHOULD BE NEAR ATLANTIC BY 130 AM. OTHER THUNDERSTORMS WERE LOCATED OVER SOUTH CENTRAL..SOUTHWEST AND WEST CENTRAL IOWA SOUTHWEST OF A LINE FROM LAMONI TO SIOUX CITY. THESE THUNDERSTORMS WER ALSO MOVING EAST AT 30 MILES AN HOUR. FERRY
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.