Severe Thunderstorm Warning 229, NWS Des Moines, IA

Issued

Jun 29, 1998, 1:09 PM CDT (18:09 UTC)

Expired

Jun 29, 1998, 1:45 PM CDT

In force

36 min

Issued by

NWS Des Moines, IA

Area

Whole counties

County Story County, IA

The Des Moines radar (KDMX), 40 km from the middle of the area, began a volume at 18:11 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 291809 RRA
SVRDSM
IAC169-291845-

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

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

* UNTIL 145 PM CDT

* AT 108 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 37
  MILES SOUTHEAST OF FORT DODGE OR 5 MILES WEST SOUTHWEST OF ROLAND
  MOVING EAST SOUTHEAST AT 30 MPH.

* THIS STORM CAN BE EXPECTED NEAR...
   ROLAND             NOW
   AMES               BY 123 PM CDT
   NEVADA             BY 124 PM CDT
   MCCALLSBURG        BY 126 PM CDT
   FERNALD            BY 128 PM CDT
   ZEARING    J        BY 135 PM CDT

GO INSIDE A 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.