Alert archive / Iowa / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 2, NWS Sioux Falls, SD

March 22, 1987Monona County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Mar 22, 1987, 6:46 PM CST for Monona County, Iowa. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Mar 22, 1987, 6:46 PM CST (00:46 UTC)
Expired
Mar 22, 1987, 7:45 PM CST
In force
59 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Monona 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, 0.8 hours before the alert went out and 88 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, Omaha, NE at 00:00Z on 1987-03-23Temperature 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, Omaha, NE at 00:00Z on 1987-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.19395878Sfc1 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
3507 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
178 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 230046
SVRSUX
IAC093-133-230145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
ISSUED BY DES MOINES IA
646 PM CST SUN MAR 22 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 745 PM CST FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

WEST CENTRAL IOWA...IDA AND NORTHEAST MONONA

AT 630 PM...MONONA COUNTY SHERIFF REPORTED GOLF BALL SIZED HAIL
1 MILE WEST OF TURIN...OR 40 MILES SOUTHEAST OF SIOUX CITY.

THIS SEVERE THUNDERSTORM WAS MOVING NORTHEAST AT 30 MILES AN HOUR
AND WILL MOVE THROUGH MAPLETON AND INTO IDA COUNTY BETWEEN 645
AND 7 PM.

REMEMBER...A SEVERE THUNDERSTORM PRODUCES DAMAGING WI3NDS IN EXCESS
OF 60 MPH...LARGE HAIL..DEADLY LIGHTNING...AND HEAVY RAINS THAT
QUICKLY FLOOD LOW LYING AREAS.  PEOPLE IN THE PATH OF THE STORM
SHOULD TAKE COVER IMMEDIATELY.

TRUETT/QUINN

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, Mar 22, 3:59 PM CST, 2 hours 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
400 PM CST SUN MAR 22 1987

...WINTER STORM WATCH EXTREME SOUTHWEST CORNER AND SOUTH CENTRAL SOUTH
DAKOTA FOR MONDAY AND MONDAY NIGHT...

A STRONG LOW PRESSURE SYSTEM OVER NORTHEAST NEW MEXICO WILL MOVE SLOWLY
NORTHEAST AND REACH KANSAS MONDAY. VERY MOIST AIR FEEDING INTO THIS
STORM FROM THE SOUTH WILL COMBINE WITH COOL AIR OVER SOUTH DAKOTA...
POSSIBLY CAUSING HEAVY SNOW IN SOUTH CENTRAL AND EXTREME SOUTHWEST SOUTH
DAKOTA. THEREFORE...THE NATIONAL WEATHER SERVICE HAS ISSUED A WINTER
STORM WATCH FOR THESE AREAS FOR MONDAY AND MONDAY NIGHT. IF THE HEAVY
SNOW DEVELOPS...BRISK NORTH WINDS WILL CAUSE BLOWING AND DRIFTING SNOW
...RESULTING IN VERY DIFFICULT TRAVEL CONDITIONS.

SIGNIFIGANT SNOW IS LESS LIKELY FURTHER WEST AND NORTH IN SOUTH DAKOTA
WHILE IN THE EAST MAINLY RAIN IS EXPECTED. HOWEVER...A SLIGHT SHIFT IN
THE STORM TRACK COULD CAUSE A WINTER STORM THREAT TO OTHER PARTS OF THE
STATE. THIS WILL BE A SLOW MOVING STORM AND WILL AFFECT SOUTH DAKOTA
THROUGH TUESDAY OR WEDNESDAY. THE NATIONAL WEATHER SERVICE WILL ISSUE
REGULAR STATEMENTS ON THIS DEVELOPING STORM.

WILLIAMS

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 22, 6:46 PM CSTSevere Thunderstorm WarningFSDIda44 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1987Every severe thunderstorm warning in 1987

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.