Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 8, NWS Des Moines, IA

April 25, 1986Keokuk County, Mahaska County, Wapello County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 25, 1986, 1:17 AM CST for Keokuk County, Mahaska County, Wapello County, Iowa. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Apr 25, 1986, 1:17 AM CST (07:17 UTC)
Expired
Apr 25, 1986, 2:15 AM CST
In force
58 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Keokuk County, IA, Mahaska County, IA, Wapello 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, 7.3 hours before the alert went out and 244 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.

Skew-T log-pSkew-T log-p diagram, Peoria Regional, IL at 00:00Z on 1986-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peoria Regional, IL at 00:00Z on 1986-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2255 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
219 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDSM 250719
SVRDSM
IAC107-179-123-250815-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
117 AM CST FRI APR 25 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 215 AM CST FOR PEOPLE IN THE FOLLOWING
COUNTIES OF

SOUTHEAST IOWA...SOUTHERN KEOKUK...NORTHEAST WAPELLO AND SOUTHEAST
                 MAHASKA

AT 112 AM..3/4 INCH TO GOLF BALL SIZED HAIL WAS REPORTED AT
OSKALOOSA..ABOUT 20 MILES NORTHWEST OF OTTUMWA.

THE STORM WAS MOVING EAST-SOUTHEAST AT 35 MILES AN HOUR..AND WILL
MOVE JUST TO THE NORTH OF THE OTTUMWA AREA.

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.

TRUETT/FERRY

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, Apr 24, 9:43 PM CST, 3 hours 34 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
940 PM CST THU APR 24 1986

AT 915 PM..MARBLE SIZE HAIL WAS REPORTED AT WINTERSET.
AT 920 PM..SMALL HAIL WAS REPORTED JUST SOUTHEAST OF INDIANOLA.

AT 935 PM..
A THUNDERSTORM WITH VERY HEAVY RAIN AND SMALL HAIL WAS LOCATED 20
MILES SOUTHWEST OF DES MOINES NEAR WINTERSET.  ANOTHER THUNDERSTORM
WITH VERY HEAVY RAIN AND SMALL HAIL WAS LOCATED 20 MILES SOUTHEAST
O"F DES MOINES BETWEEN INDIANOLA AND MELCHER.

THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR.AND SHOULD BE MOVING
INTO THE KNOXVILLE AREA BY 1015 PM.

THERE HAS BEEN NO SEVERE WEATHER REPORTED WITH THESE STORMS.

BARLOW/MCQUIRTER
Special weather statement, Apr 24, 11:10 PM CST, 2 hours 7 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
1110 PM CST THU MAR 24 1986

..THUNDERSTORMS DEVELOP RAPIDLY ACROSS NORTHCENTRAL AND NORTHEAST IOWA..

AT 1100 PM..WATERLOO RADAR SHOWED A BAND OF SHOWERS AND THUNDERSTORMS
DEVELOPING RAPIDLY ACROSS NORTHEAST AND NORTHCENTRAL IOWA.  THE BAND
EXTENDED FROM NEW HAMPTON..35 NORTH OF WATERLOO..TO FORT DODGE.

THE STRONGEST THUNDERSTORMS WERE IN WRIGHT AND FRANKLIN COUNTIES..
BETWEEN SHEFFIELD..20 MILES SOUTH OF MASON CITY..TO EAGLE GROVE WHICH
IS 10 MILES NORTHEAST OF FORT DODGE.  THESE THUNDERSTORMS COULD PRODUCE
BRIEF PERIODS OF HEAVY RAIN AND SOME SMALL HAIL AS THEY MOVE THROUGH
SOUTH CERRO GORDO..NORTH FRANKLIN AND FLOYD COUNTIEbS BETWEEN 1100 PM
AND MIDNIGHT.

THE STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
HAMILTON
Local storm report, Apr 24, 11:18 PM CST, 1 hour 59 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1120 PM CST THU APR 24 1986

TIME             REPORT

1018 PM CST      1 INCH DIAMETER HAIL REPORTED BY NWS EMPLOYEE
                 IN INdDIANOLA.  HAIL LASTED 2 MINUTES.

1110 PM CST      DIME SIZE HAIL REPORTED AT NEW VIRGINIA.

SCHUMACHER
Local storm report, Apr 25, 12:07 AM CST, 1 hour 10 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1205 AM CST FRI APR 25 1986

TIME             REPORT

1156 PM CST      3/4 INCH DIAMETER HAIL REPORTED BY SHERIFF IN
                 MARION COUNTY..1 MILE NORTH OF COLUMBIA.

SCHUMACHER
Special weather statement, Apr 25, 12:08 AM CST, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
1200 AM CST FRI MAR 25 1986

...STRONG THUNDERSTORMS CONTINUE IN NORTHCENTRAL AND NORTHEAST IOWA..

AT MIDNIGHT..A BAND OF STRONG THUNDERSTORMS CONTINUE IN NORTHCENTRAL
AND NORTHEAST IOWA.  THE BAND EXTENDED FROM NEAR NEW HAMPTON..30 MILES
NORTH OF WATERLOO TO CLARION..30 MILES SOUTHWEST OF MASON CITY.

THE STRONGEST THUNDERSTORMS WERE IN FRANKLIN AND FLOYD COUNTIES..
BETWEEN SHEFFIELD..20 MILES SOUTH OF MASON CITY..TO CHARLES CITY WHICH
IS 30 MILES SOUTHEAST OF MASON CITY.  THESE THUNDERSTORMS HAVE AND WILL
CONTINUE TO PRODUCE BRIEF PERIODS OF HEAVY RAIN AND SOME SMALL HAIL.

PERSONS IN FLOYD AND NORTH CHICKASAW COUNTIES WILL EXPERIENCE THESE
STORMS BETWEEN MIDNIGHT AND 100 AM.

THE STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
HAMILTON
Special weather statement, Apr 25, 12:52 AM CST, 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1250 AM CST FRI APR 25 1986

AT 1235 AM..
A THUNDERSTORM WAS PRODUCING VERY HEAVY RAIN AND POSSIBLELY SOME
SMALL HAIL OVER SOUTH CENTRAL IOWA.  THE STORM WAS LOCATED 35 MILES
SOUTHEAST OF DES MOINES.  THE STORM WAS MOVING NORTHEAST AT 40 MILES
AN HOUR.  THE STORM WILL BE PASSING JUST NEAR OSKALOOSA BY 1 AM.
PEOPLE IN AND NEAR OSKALOOSA CAN EXPECT VERY HEAVY RAIN AND SMALL HAIL
FROM THIS STORM.

ANOTHER THUNDERSTORM WAS INDICATED OVER CENTRAL IOWA JUST NORTHEAST
OF INDIANOLA.  A THUNDERSTORM WAS OCCURRING OVER NORTH CENTRAL IOWA
15 MILES SOUTHEAST OF MASON CITY. THESE STORMS WERE ALSO MOVING EAST
AT 40 MILES AN HOUR.

FERRY

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 10:37 PM CSTSevere Thunderstorm WarningDMXMadison, Warren33 min
Apr 24, 11:07 PM CSTSevere Thunderstorm WarningDMXWarren38 min
Apr 24, 11:39 PM CSTSevere Thunderstorm WarningDMXMarion36 min
Apr 25, 4:24 PM CSTSevere Thunderstorm WarningDMXFloyd41 min
Apr 25, 4:42 PM CSTSevere Thunderstorm WarningDMXAllamakee53 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.