Severe Thunderstorm Warning 201, NWS Des Moines, IA

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-251100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
843 PM CDT WED JUN 24 1998

HAZARD--SCATTERED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
EXCESSIVE RAINFALL...HAIL TO 2 INCHES IN DIAMETER...WIND GUSTS
TO 80 MPH ALONG WITH ISOLATED TORNADOES.

AREA OF CONCERN AND TIMING DETAILS--
AFTER 900 PM OVER THE NORTHERN THIRD OF IOWA...NORTH OF A LINE FROM
DENISON TO FORT DODGE TO WAVERLY.  THIS AREA HAS THE HIGHEST THREAT
OF ISOLATED TORNADOES...LARGE HAIL...AND DAMAGING WINDS ALONG WITH
EXCESSIVE RAINS.

AFTER 1100 PM...WEST OF A LINE FROM GUTHRIE CENTER TO CRESTON TO
MOUNT AYR.  THE MAIN THREATS IN THESE LOCATIONS WILL BE DAMAGING
WINDS AND EXCESSIVE RAINS.

METEOROLOGICAL COMMENTS -AN EXTREMELY UNSTABLE AIRMASS REMAINS
ENTRENCHED OVER ALL OF IOWA THIS EVENING.  A WARM FRONT EXTENDS FROM
A SURFACE LOW OVER NORTH-CENTRAL NEBRASKA THROUGH NORTHERN IOWA INTO
SOUTHEAST WISCONSIN.  MEANWHILE...A DRYLINE EXTENDS SOUTHWARD INTO
SOUTHERN KANSAS AS AN UPPER LEVEL DISTURBANCE WAS MOVING NORTHEAST
THROUGH THE CENTRAL PLAINS TOWARD NORTHWEST IOWA.  A STRONG LOW-LEVEL
JET OF 45 TO 50 MPH CONTINUES TO TRANSPORT LARGE QUANTITIES OF
MOISTURE INTO WESTERN IOWA AND EASTERN NEBRASKA.  A LARGE COMPLEX OF
SEVERE STORMS OVER NORTH-CENTRAL NEBRASKA CONTINUES TO MOVE EAST
ALONG THE WARM FRONT WHILE STRONG TO OCCASIONALLY SEVERE STORMS WERE
MOVING NORTHEAST IN KANSAS ALONG THE DRYLINE.  AT THE SAME TIME...NEW
STORMS WERE BEGINNING TO DEVELOP IN FAR NORTHEAST IOWA ALONG AND
NORTH OF THE WARM FRONT.  THE STORMS OVER NEBRASKA AND KANSAS SHOULD
MOVE INTO WESTERN PORTIONS OF IOWA BETWEEN 900 AND 1100 AM WITH THE
BEST THREAT FOR TORNADOES OVER THE NORTHERN THIRD OF  IOWA...WITH
DAMAGING WINDS...LARGE HAIL...AND EXCESSIVE RAINS POSSIBLE OVER THE
REST OF WESTERN IOWA.  IN PORTIONS OF CENTRAL...SOUTH-CENTRAL...AND
SOUTHEAST IOWA...TEMPERATURES ALOFT SHOULD REMAIN WARM ENOUGH TO KEEP
ANY THUNDERSTORMS THAT DO DEVELOP BELOW SEVERE LIMITS.

PRECAUTIONS THIS WEATHER SETUP IS RAPIDLY EVOLVING THIS EVENING AND
WILL CONTINUE TO DO SO INTO THE NIGHTTIME HOURS.  ONCE STORMS
DEVELOP...THEY HAVE THE POTENTIAL TO QUICKLY BECOME SEVERE.  SPOTTER
GROUPS SHOULD ACTIVE...ESPECIALLY OVER THE NORTHERN THIRD OF IOWA...
AND SHOULD STRONGLY CONSIDER ACTIVATION OVER THE WESTERN QUARTER OR
THIRD OF THE STATE.

THE FLASH FLOOD THREAT REMAINS HIGH OVER MOST OF NORTHERN IOWA.  A
FLASH FLOOD WATCH IS IN EFFECT FOR THE NORTHERN HALF OF IOWA.  STAY
TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION
STATIONS...OR YOUR CABLE TELEVISION PROVIDER FOR LATER
STATEMENTS CONCERNING THIS POTENTIALLY DANGEROUS SEVERE WEATHER AND
FLASH FLOOD THREAT.

SEARCY