Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 94, NWS Des Moines, IA

July 27, 1986Bremer County, Chickasaw County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 27, 1986, 9:32 PM CDT for Bremer County, Chickasaw County, Iowa. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Jul 27, 1986, 9:32 PM CDT (02:32 UTC)
Expired
Jul 27, 1986, 10:30 PM CDT
In force
58 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Bremer County, IA, Chickasaw 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

Minneapolis, MN (KSTC), launched 00:00Z, 2.5 hours before the alert went out and 238 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, Minneapolis, MN at 00:00Z on 1986-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 521 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, Minneapolis, MN at 00:00Z on 1986-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 square meters per square second.1939Sfc1 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
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

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 5 hours 27 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, 3 hours 53 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, 3 hours 2 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, 1 hour 59 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
Special weather statement, Jul 27, 8:35 PM CDT, 57 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
835 PM CDT SUN JUL 27 1986

..SEVERE THUNDERSTORM WATCH FOR MUCH OF CENTRAL AND NORTHERN IOWA
  UNTIL 11 PM..

AT 830 PM
SEVERE THUNDERSTORMS WERE LOCATED IN HOWARD AND ALLAMAKEE COUNTIES
OF NORTHEAST IOWA. THESE STORMS COULD PRODUCE VERY HEAVY RAIN..
DAMAGEING WINDS..AND DANGEROUS LIGHTNING. THESE STORMS WERE PART
OF A 45 MILE WIDE BAND OF STORMS AND SHOWERS THAT OCCUPIED THE
NORTH MOST TWO TIERS OF COUNTIES EAST OF MASON CITY.

THE STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.
OBRIEN
Special weather statement, Jul 27, 9:13 PM CDT, 19 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 7:57 PM CDTSevere Thunderstorm WarningDMXHoward, Winneshiek48 min
Jul 27, 7:57 PM CDTSevere Thunderstorm WarningDMXAllamakee48 min
Jul 27, 8:53 PM CDTSevere Thunderstorm WarningDMXFloyd62 min
Jul 28, 6:58 PM CDTSevere Thunderstorm WarningDMXDickinson62 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.