Severe Thunderstorm Warning 231, NWS Des Moines, IA

Issued

Jun 29, 1998, 1:20 PM CDT (18:20 UTC)

Expired

Jun 29, 1998, 2:10 PM CDT

In force

50 min

Issued by

NWS Des Moines, IA

Area

Whole counties

County Marshall County, IA

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 18:21 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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.

000 
TTAA00 KDSM 291820 RRA
SVRDSM
IAC127-291910-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
120 PM CDT MON JUN 29 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARSHALL COUNTY IN CENTRAL IOWA

* UNTIL 210 PM CDT

* AT 119 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  43 MILES NORTHEAST OF DES MOINES OR 7 MILES WEST OF ALBION MOVING
  EAST SOUTHEAST AT 40 MPH.

* THIS STORM CAN BE EXPECTED NEAR...
   LISCOMB            BY 121 PM CDT
   ALBION             BY 124 PM CDT
   HAVERHILL          BY 131 PM CDT
   MARSHALLTOWN       BY 132 PM CDT
   FERGUSON           BY 138 PM CDT

GO INSIDE hA STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO
WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

COGIL

In the hours before

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-292100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1038 AM CDT MON JUN 29 1998

HAZARD--SCATTERED TO NUMEROUS THUNDERSTORMS...SOME PRODUCING SEVERE
WEATHER INCLUDING DAMAGING WINDS...LARGE HAIL AND TORNADOES.

AREA OF CONCERN AND TIMING DETAILS--WEST OF A WAVERLY--FORT DODGE--
CRESTON LINE THROUGH 200 PM...THEN SPREADING EAST THROUGHOUT THE REST
OF IOWA DURING THE MID TO LATE AFTERNOON.

METEOROLOGICAL COMMENTS--A FRONTAL BOUNDARY IS BECOMING MORE
ESTABLISHED FROM NEAR DECORAH TO NEAR SIOUX CITY TO A LOW PRESSURE
CENTER IN SOUTHWEST NEBRASKA.  ISOLATED SEVERE THUNDERSTORMS WERE
ALREADY DEVELOPING IN NORTHEAST NEBRASKA...WEST OF SIOUX CITY.
OTHER STORMS WERE EXPANDING OVER NORTH CENTRAL AND NORTHWEST IOWA
WHICH ARE EXPECTED TO INTENSIFY.  PLENTIFUL MOISTURE AND
INSTABILITY IS AVAILABLE FOR STRONG STORM UPDRAFTS.  STORM-
RELATIVE WIND SHEAR IS QUITE FAVORABLE FOR THE DEVELOPMENT AND
MAINTENANCE OF SUPERCELL THUNDERSTORMS WITH ROTATION...THUS THE
ISOLATED TORNADO THREAT.  AS TEMPERATURES HEAT UP OVER CENTRAL
IOWA...INSTABILITY WILL CONTINUE TO INCREASE WITH CAPE VALUES UP TO
5000 JOULES PER KILOGRAM.

PRECAUTIONS--SPOTTER GROUPS WILL LIKELY BE NEEDED THIS AFTERNOON.  A
SEVERE WEATHER WATCH IS BEING CONSIDERED FOR MUCH OF THE AREA OF
CONCERN ALSO IN THE NEXT 1 OR 2 HOURS.  KEEP ABREAST OF FURTHER
UPDATES AND PAY ATTENTION TO NWS SHORT TERM FORECASTS FOR ADDITIONAL
INFORMATION.

KULA

Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.