Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 30, NWS Sioux Falls, SD

June 5, 1990Monona County, Plymouth County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 5, 1990, 12:39 AM CDT for Monona County, Plymouth County, Woodbury County, Iowa. It was in force for 66 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 5, 1990, 12:39 AM CDT (05:39 UTC)
Expired
Jun 5, 1990, 1:45 AM CDT
In force
66 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Monona County, IA, Plymouth County, IA, Woodbury County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jun 5, 1:10 AM CDTThunderstorm Wind 50Woodbury, IA
Jun 5, 1:26 AM CDTThunderstorm Wind 50Plymouth, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.7 hours before the alert went out and 122 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 1990-06-05Temperature 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 1990-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 161 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
3602 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
492 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 KSUX 050539
SVRSUX
IAC133-149-193-050645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SIOUX CITY IA
1239 AM CDT TUE JUN 5 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE WEST CENTRAL PART OF IOWA
      MONONA...WOODBURY...

   IN THE NORTHWEST PART OF IOWA
      PLYMOUTH...

AT 1235 AM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
MOVING INTO THE WESTERN PARTS OF MONONA...WOODBURY AND PLYMOUTH
COUNTIES. THE STORMS EXTENDED FROM 35 MILES NORTH OF SIOUX CITY TO
40 MILES SOUTH OF SIOUX CITY AND WERE MOVING EAST AT 40 MILES AN H
OUR.

REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYING AREAS. IF YOU ARE IN THE PATH OF THIS STORM
TAKE SHELTER IN A REINFORCED BUILDING IMMEDIATELY.
)
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORTS
OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

KROPP

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 5, 12:26 AM CDT, 13 minutes before
IAZ001-004-005-050615-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1220 AM CDT TUE JUN 5 1990

...THUNDERSTORMS WITH STRONG GUSTY WINDS IN SIOUXLAND AREA...

AT 1215 AM CDT RADAR SHOWED AN AREA OF SHOWERS AND THUNDERSTORMS MOVING
EAST ACROSS THE SIOUXLAND AREA AT 35 TO 40 MILES AN HOUR. THESE STORMS
WERE ACCOMPANIED BY STRONG GUSTY WINDS CAPABLE OF DOWNING DEAD TREES
AND BRANCHES. A GUST OF 42 MILES AN HOUR WAS RECORDED BY THE NATIONAL
WEATHER SERVICE AT THE SIOUX GATEWAY AIRPORT AT SIOUX CITY AT 1159 AM
CDT.

THESE THUNDERSTORMS EXTENDED ALONG BOTH SIDES OF THE MISSOURI AND BIG
SIOUX RIVERS FROM NEAR SIOUX FALLS SOUTH DAKOTA...THROUGH SIOUX CITY
TO JUST NORTH OF OMAHA NEBRASKA. THEY WILL AFFECT THE SIOUXLAND AREA
WITH WIND GUSTS TAROUND 45 MILES AN HOUR AND BRIEF HEAVY RAIN THROUGH
200 AM CDT.
KROPP

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 5, 1:19 AM CDTSevere Thunderstorm WarningFSDSioux56 min
Jun 5, 1:45 AM CDTSevere Thunderstorm WarningFSDLyon30 min
Jun 5, 2:20 AM CDTSevere Thunderstorm WarningFSDSioux25 min
Jun 5, 3:56 AM CDTSevere Thunderstorm WarningFSDOsceola49 min
Jun 5, 3:56 AM CDTSevere Thunderstorm WarningFSDLyon, Sioux34 min
Jun 5, 4:13 AM CDTSevere Thunderstorm WarningFSDO'Brien62 min
Jun 5, 4:42 AM CDTSevere Thunderstorm WarningFSDCherokee, O'Brien63 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1990Every severe thunderstorm warning in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.