Severe Thunderstorm Warning 4, NWS Des Moines, IA

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-302100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1116 AM CST MON MAR 30 1998

HAZARD--THUNDERSTORMS THIS AFTERNOON COULD PRODUCE HEAVY RAINS AND
GUSTY WINDS IN EXCESS OF 58 MPH.

TIMING AND AREA OF CONCERN -SOUTHEAST OF A LINE FROM MASON CITY TO
CARROLL...WITH THE THREAT OF STRONG WINDS SOUTHEAST OF A LINE FROM
WATERLOO TO DES MOINES TO CRESTON. TIMING IS AFTER 200 PM.

METEOROLOGICAL COMMENTS -A STATIONARY FRONT EXTENDS FROM NORTHWEST OF
WATERLOO THROUGH DES MOINES AND TO THE SOUTHEAST OF
CRESTON...PROVIDING A STRONG CONTRAST IN WEATHER ACROSS IOWA. THE
FRONT WILL MOVE LITTLE TODAY AS A LOW PRESSURE CENTER IS FORECAST TO
MOVE NORTH ALONG THE FRONT TONIGHT. AS A RESULT...THE ATMOSPHERE WILL
BECOME QUITE WARM AND UNSTABLE THIS AFTERNOON OVER SOUTHEAST IOWA
WHILE REMAINING COOL AND DAMP IN THE NORTHWEST. DIVERGENT AIR FLOW
ALOFT WILL ALLOW THUNDERSTORMS TO REDEVELOP IN VICINITY OF THE FRONT
THIS AFTERNOON WITH STORMS TRACKING RAPIDLY TO THE NORTHEAST.

SOUTHEAST OF THE WATERLOO TO CRESTON LINE...INSTABILITY AND WIND
SHEAR WILL BE FAVORABLE FOR A FEW STORMS TO BECOME SEVERE...PRODUCING
HAIL UP TO 1 INCH AND WINDS OVER 58 MPH. NORTHWEST OF THIS AREA TO
MASON CITY AND CARROLL...THE THREAT IS ORIENTED MORE TOWARD EMBEDDED
THUNDERSTORMS WITH BRIEF HEAVY RAINS.  THIS WILL OCCUR AS VERY MOIST
AIR OVERRUNS THE FRONTAL BOUNDARY. AVERAGE RAINFALL IS EXPECTED TO BE
IN THE ONE HALF TO THREE QUARTER INCH RANGE THROUGH THIS
EVENING...WITH ISOLATED HEAVIER AMOUNTS. SINCE ONE HALF TO 1.5 INCHES
OF RAIN HAS ALREADY FALLEN OVER PORTIONS OF CENTRAL IOWA...RIVERS AND
STREAMS ARE RISING AND CHANCES FOR MINOR FLOODING WILL CONTINUE.

PRECAUTIONS SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON SOUTHEAST
OF THE WATERLOO TO CRESTON LINE. AS STREAMS CONTINUE TO RISE...USE
CAUTION IN FLOOD PRONE AREAS AND KEEP ABREAST OF THE LATEST
FORECASTS.

JUNGBLUTH

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-302100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1116 AM CST MON MAR 30 1998

HAZARD--THUNDERSTORMS THIS AFTERNOON COULD PRODUCE HEAVY RAINS AND
GUSTY WINDS IN EXCESS OF 58 MPH.

TIMING AND AREA OF CONCERN -SOUTHEAST OF A LINE FROM MASON CITY TO
CARROLL...WITH THE THREAT OF STRONG WINDS SOUTHEAST OF A LINE FROM
WATERLOO TO DES MOINES TO CRESTON. TIMING IS AFTER 200 PM.

METEOROLOGICAL COMMENTS -A STATIONARY FRONT EXTENDS FROM NORTHWEST OF
WATERLOO THROUGH DES MOINES AND TO THE SOUTHEAST OF
CRESTON...PROVIDING A STRONG CONTRAST IN WEATHER ACROSS IOWA. THE
FRONT WILL MOVE LITTLE TODAY AS A LOW PRESSURE CENTER IS FORECAST TO
MOVE NORTH ALONG THE FRONT TONIGHT. AS A RESULT...THE ATMOSPHERE WILL
BECOME QUITE WARM AND UNSTABLE THIS AFTERNOON OVER SOUTHEAST IOWA
WHILE REMAINING COOL AND DAMP IN THE NORTHWEST. DIVERGENT AIR FLOW
ALOFT WILL ALLOW THUNDERSTORMS TO REDEVELOP IN VICINITY OF THE FRONT
THIS AFTERNOON WITH STORMS TRACKING RAPIDLY TO THE NORTHEAST.

SOUTHEAST OF THE WATERLOO TO CRESTON LINE...INSTABILITY AND WIND
SHEAR WILL BE FAVORABLE FOR A FEW STORMS TO BECOME SEVERE...PRODUCING
HAIL UP TO 1 INCH AND WINDS OVER 58 MPH. NORTHWEST OF THIS AREA TO
MASON CITY AND CARROLL...THE THREAT IS ORIENTED MORE TOWARD EMBEDDED
THUNDERSTORMS WITH BRIEF HEAVY RAINS.  THIS WILL OCCUR AS VERY MOIST
AIR OVERRUNS THE FRONTAL BOUNDARY. AVERAGE RAINFALL IS EXPECTED TO BE
IN THE ONE HALF TO THREE QUARTER INCH RANGE THROUGH THIS
EVENING...WITH ISOLATED HEAVIER AMOUNTS. SINCE ONE HALF TO 1.5 INCHES
OF RAIN HAS ALREADY FALLEN OVER PORTIONS OF CENTRAL IOWA...RIVERS AND
STREAMS ARE RISING AND CHANCES FOR MINOR FLOODING WILL CONTINUE.

PRECAUTIONS SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON SOUTHEAST
OF THE WATERLOO TO CRESTON LINE. AS STREAMS CONTINUE TO RISE...USE
CAUTION IN FLOOD PRONE AREAS AND KEEP ABREAST OF THE LATEST
FORECASTS.

JUNGBLUTH