Severe Thunderstorm Warning 7, NWS Des Moines, IA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
412 AM CDT WED APR 30 2003

BUSY NIGHT.  THUNDERSTORMS HAVE FIRED ALONG THE 850MB WARM FRONT
ACROSS CENTRAL IOWA.  THE ELEVATED CONVECTION MAINLY PRODUCED
MARGINALLY SEVERE HAIL (DIME SIZED) AND WERE EFFECTIVE RAIN
PRODUCERS.  I EXPECT THE STORMS TO LIFT NORTH THROUGH THE MORNING
HOURS ALONG WITH THE 850MB FRONT.  THERE WILL BE A BREAK IN THE
STORMS THIS MORNING BUT GIVEN THE STRENGTH OF THE WAA AND THE UPPER
LEVEL WINDS ALONG WITH THE SFC FRONT LIFTING NORTH AND SEVERAL
SHORTWAVES EJECTING OUT OF THE WESTERN TROUGH...ANY BREAK IN
ACTIVITY WILL BE SHORT LIVED.  I HAVE MENTIONED OCCASIONAL TSRA IN
THE ZONES AS TIMING ISSUES WILL MAKE IT IMPOSSIBLE TO DEFINE ANY 2
OR 3 HOUR PERIOD AS PRECIPITATION FREE.

SEVERE WEATHER PRETTY MUCH ON THE SLATE FOR THE AFTERNOON BUT THE
MAIN THREAT SHOULD BE IN MO...CLOSER TO THE FRONT.  DEPENDING ON HOW
CLOSE THE FRONT MOVES...FAR SOUTHERN IOWA COULD ALSO BE AT RISK.  I
WILL MENTION THE POSSIBILITY OF A TORNADO OR TWO ACROSS SERN IA.
LARGE HAIL AND WIND WILL BE THE MAIN THREAT THOUGH.  LEFT THE
EXTENDED ALONE.

.DSM...NONE

FAB

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-011100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
534 AM CDT WED APR 30 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL IOWA.

...SEVERE WEATHER POTENTIAL EXISTS IN CENTRAL IOWA TODAY THROUGH THE
EVENING...

.DAY ONE...TODAY AND TONIGHT

A MODERATE RISK OF SEVERE THUNDERSTORMS EXISTS ACROSS THE SOUTHERN
THIRD OF CENTRAL IOWA...MAINLY ALONG AND SOUTH OF THE I-80 CORRIDOR.
THE MAIN THREAT WILL BE VERY LARGE HAIL AND DAMAGING WIND BUT
TORNADOES ARE ALSO POSSIBLE...ESPECIALLY OVER THE SOUTHERN TWO TIERS
OF COUNTIES ACROSS CENTRAL IOWA.  THE EXPECTED TIME FOR THE MAIN
THREAT OF SEVERE WEATHER WILL BE BETWEEN 2 PM THIS AFTERNOON THROUGH
10 PM THIS EVENING.  HOWEVER...OCCASIONAL THUNDERSTORMS WILL EXIST
OVER CENTRAL IOWA THROUGHOUT THE DAY WITH THE POTENTIAL FOR ANY
STORM TO PRODUCE HEAVY RAIN AND THREE QUARTER INCH HAIL.  ADDITIONAL
RAINFALL AMOUNTS TODAY AND TONIGHT ARE EXPECTED TO TOTAL BETWEEN ONE
AND TWO INCHES WITH LOCALLY HIGHER AMOUNTS.

NORTH OF THE I-80 CORRIDOR UP TO THE HIGHWAY 30 CORRIDOR...A SLIGHT
RISK OF SEVERE THUNDERSTORMS EXISTS.  THE MAIN SEVERE THREAT FROM
THESE STORMS WILL BE LARGE HAIL BUT HEAVY RAINFALL IS LIKELY TODAY
ACROSS THE NORTHERN HALF OF CENTRAL IOWA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE NEXT CHANCE FOR THUNDERSTORM ACTIVITY OVER CENTRAL IOWA WILL
COME LATE SUNDAY. THE CHANCE FOR THUNDERSTORMS WILL CONTINUE THROUGH
TUESDAY.

.SPOTTER INFORMATION STATEMENT...

MID IOWA SKYWARN AND SPOTTER GROUPS SHOULD BE READY TO ACTIVATE THIS
AFTERNOON AND EVENING.
&&

MORE INFORMATION CAN BE OBTAINED AT WWW.CRH.NOAA.GOV/DMX (ALL LOWER
CASE).

FAB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
0259 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0248 AM    5 W BRIDGEWATER           IA   0.75 IN HAIL
04/30/03   CASS                           FROM NATIONAL WEATHER
                                          SERVICE SPOTTER

SMALL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
0643 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0605 AM    PRAIRIE CITY              IA   0.88 IN HAIL
04/30/03   JASPER                         TRAINED SPOTTER

BF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
0720 AM CDT WED APR 30 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0715 AM    WEST DES MOINES           IA   0.88 IN HAIL
04/30/03   POLK                           NWS EMPLOYEE

BF