Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 65, NWS Des Moines, IA

June 30, 1986Iowa County, Poweshiek County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 30, 1986, 1:12 AM CDT for Iowa County, Poweshiek County, Iowa. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1986, 1:12 AM CDT (06:12 UTC)
Expired
Jun 30, 1986, 2:00 AM CDT
In force
48 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Iowa County, IA, 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, 6.2 hours before the alert went out and 252 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 1986-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 joules per kilogram.LCLLFCEL10008507005003002001001 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 1986-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
47 J/kg
Mixed-layer CIN
-242 J/kg
Mixed-layer LCL
1224 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
176 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 300613
SVRDSM
IAC157-095-300700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
112 AM CDT MON JUN 30 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 200 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF

EAST CENTRAL IOWA...EXTREME EASTERN POWESHIEK AND WESTERN IOWA

AT 0109 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM OVER
EASTERN POWESHIEK COUNTY...ROUGHLY 40 MILES WEST OF IOWA CITY.

THIS STORM WAS MOVING TO THE EAST AT 35 MPH...AND WILL MOVE
INTO THE WESTERN PART OF IOWA COUNTY BY 2AM.  THIS INCLUDES
THE WILLIAMSBURG 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.  PEOPLE IN THE PATH OF THIS STORM
SHOULD TAKE APPROPRIATE ACTION IMMEDIATELY.

ELLINGSON

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, Jun 29, 9:21 PM CDT, 3 hours 51 minutes before
<PQ<
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
915 PM CDT SUN JUN 29 1986

THE SEVERE THUNDERSTORM WARNING FOR GREENE COUNTY HAS EXPIRED.
THE STORM HAS DECRESED IN INTENSITY AND^ WAS MOVING SOUTHEAST
AROUND 30 MILES AN HOUR.

FORSTER
Special weather statement, Jun 29, 10:48 PM CDT, 2 hours 24 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1045 PM CDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WATCH FOR A LARGE PART OF SOUTHERN AND CENTRAL
IOWA UNTIL 5 AM MONDAY MORNING...

NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA BETWEEN 1010-1045 PM.

AT 1035 PM...VERY STRONG THUNDERSTORMS WERE OVER WEST CENTRAL AND EAST
CENTRAL IOWA.  ONE STORM WAS JUST WEST OF GUTHRIE CENTER..50 MILES WEST
OF DES MOINES.  ANOTHER STORM WAS JUST EAST OF CEDAR RAPIDS.

VERY HEAVY RAINS..BRIEF GUSTY WINDS AND POSSIBLY SOME SMALL HAIL CAN BE
EXPECTED WITH THESE STORMS.

ELSEWHERE..NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS EXTENDED FROM
NORTHEAST INTO SOUTHWEST I/OWA.  THE LEADING EDGE OF THE RAINFALL
EXTENDED FROM THE QUAD CITIES THROUGH PELLA AND INDIANOLA TO THE SOUTH-
WEST CORNER OF THE STATE.

THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.

SIECZYNSKI
Special weather statement, Jun 29, 11:18 PM CDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1115 PM CDT SUN JUN 29 1986

       ...STRONG THUNDERSTORMS APPROACHING DES MOINES...

AT 1105 PM...A NARROW BAND OF VERY STRONG THUNDERSTORMS WAS OVER
CENTRAL IOWA.  THE BAND WAS 15 MILES WIDE AND STRETCHED FROM NEVADA
THROUGH SAYLORVILLE RESERVOIR AND ADEL TO CRESTON.

VERY HEAVY RAINS..FREQUENT DANGEROUS LIGHTNING AND BRIEF GUSTY WINDS
WILL BE EXPERIENCED WITH THE PASSAGE OF THESE STORMS.

BY 1215 AM THIS BAND OF STORMS SHOULD EXTEND FROM NEWTON THROUGH
INDIANOLA TO OSCEOLA.

THE STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR A LARGE PART OF
SOUTHERN AND CENTRALH IOWA UNTIL 5 AM MONDAY MORNING.

SIECZYNSKI
Special weather statement, Jun 29, 11:46 PM CDT, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1145 PM CDT SUN JUN 29 1986

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PART OF
SOUTHERN AND CENTRAL IOWA UNTIL 5 AM MONDAY MORNING...

NO SEVERE WEATHER HAS BEEN REPORTED IN IOWA BETWEEN 1040-1145 PM.

WINDS GUSTS TO 52 MILES AN HOUR WERE RECORDED AT THE DES MOINES
AIRPORT AT 1125 PM.

AT 1135 PM...AN INTENSE THUNDERSTORM WAS IN EAST CENTRAL IOWA JUST
WEST OF IOWA CITY..55 MILES WEST OF THE QUAD CITIES.

OTHER STRONG STORMS WERE OVER CENTRAL AND SOUTHWEST IOWA IN AND AROUND
NEVADA..DES MOINES..ADEL..WINTERSET AND CRESTON.

VERY HEAVY RAINS..FREQUENT LIGHTNING AND WIND GUST BETWEEN 45U AND
50 MILES AN HOUR CAN BE EXPECTED WITH THESE STORMS.

ELSEWHERE NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS EXTENDED
FROM NORTHEAST INTO SOUTHWEST IOWA.

THE SHOWERS AND STORMS WERE MOVNING SOUTHEAST AT 30 MILES AN HOUR.

SIECZYNSKI
Special weather statement, Jun 30, 12:17 AM CDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1215 AM CDT MON JUN 30 1986

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PART OF
SOUTHERN AND CENTRAL IOWA UNTIL 5 AM MONDAY MORNING...

AT 1210 AM...STRONG THUNDERSTORMS WERE OVER EAST CENTRAL..CENTRAL
AND SOUTH CENTRAL IOWA.  ONE GROUP OF STORMS WERE NEAR IOWA CITY.
OTHER STORMS WERE NEAR NEWTON..OSCEOLA AND ALSO WEST OF LAMONI
NEAR MT AYR.

VERY HEAVY RAINS..FREQUENT LIGHTNING AND WIND GUSTS BETWEEN 45 AND
50 MILES AN HOUR CAN BE EXPECTED WITH THESE STORMS.

AROUND OTHER PARTS OF IOWA..NUMEROUS SHOWERS AND SCATTERED THUNDER-
STORMS EXTENDED FROM EAST CENTRAL INTO SOUTHWEST IOWA.

THE SHOWERS AND STORmMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.
{{}SIECZYNSKI
Special weather statement, Jun 30, 12:52 AM CDT, 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1250 AM CDT MON JUN 30 1986

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PART OF
SOUTHERN AND CENTRAL IOWA UNTIL 5 AM MONDAY MORNING...

AT 1235 AM...A NARROW BAND OF STRONG THUNDERSTORMS EXTENDED FROM
CENTRAL INTO SOUTH CENTRAL IOWA.  THE BAND WAS 10 MILES MILES WIDE
AND STRETCHED FROM NEAR MARSHALLTOWN THROUGH PELLA AND KNOXVILLE
TO JUST EAST OF LAMONI.  OTHER STORNG STORMS WERE NEAR BELLE PLAINE
AND MARENGO..ABOUT 25 MILES WEST OF CEDAR RAPIDS.

VERY HEAVY RAINS..FREQUENT DANGEROUS LIGHTNING AND BRIEF WIND GUSTS
OF 45 TO 50 MILES AN HOUR WILL BE EXPERIENCED WITH THE PASSAGE
OF THESE STORMS.

AROUND OTtHER PARTS OF IOWA..NUMEROUS SHOWERS AND SCATTERED THUNDER-
STORMS WERE OVER ALL BUT THE NORTHWESTERN COUNTIES.

THE SHOWERS AND STORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.

SIECZYNSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:30 PM CDTSevere Thunderstorm WarningDMXCalhoun45 min
Jun 29, 8:26 PM CDTSevere Thunderstorm WarningDMXGreene49 min
Jun 29, 9:00 PM CDTSevere Thunderstorm WarningDMXEmmet45 min
Jun 29, 10:00 PM CDTSevere Thunderstorm WarningDMXGuthrie40 min
Jun 29, 10:18 PM CDTSevere Thunderstorm WarningDMXCass42 min
Jun 29, 10:25 PM CDTFlash Flood WarningDMXDallas, Polk6 hr
Jun 29, 11:50 PM CDTTornado WarningDMXPolk25 min
Jun 30, 3:45 AM CDTFlash Flood WarningDMXPolk6 hr

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.