Severe Thunderstorm Warning 110, NWS Des Moines, IA

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-221100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
716 PM CDT THU MAY 21 1998

HAZARD--SCATTERED THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAIN...STRONG
WIND GUSTS AND LARGE HAIL.

TIMING DETAILS AND AREA OF CONCERN--THE WESTERN QUARTER OF IOWA THROUGH
10 PM AND THE SOUTHERN TWO TIERS OF IOWA COUNTIES FROM 10 PM TO
MIDNIGHT.  AN ADDITIONAL THREAT FOR REDEVELOPMENT OF STORMS TOWARDS
DAYBREAK.

METEOROLOGICAL COMMENTS-- THUNDERSTORMS HAVE DEVELOPED ALONG A BOUNDARY
OVER NORTHEASTERN NEBRASKA DURING THE LATE AFTERNOON HOURS.  THESE
STORMS WILL BE MOVING INTO FAR WESTERN IOWA BY 8 PM AND THEN ACROSS THE
WESTERN QUARTER OF THE WARNING AREA BEFORE HEADING TO THE SOUTHEAST.
THE STORMS WILL COVER A CORRIDOR FROM ABOUT STORM LAKE TO
DENISON...MOVING EAST TO ROUGHLY WEBSTER CITY THEN HEAD SOUTHEAST
TOWARDS CHARITON AND OTTUMWA LATER THIS EVENING.  THESE STORMS HAD A
HISTORY OF PRODUCING STRONG WIND AND LARGE HAIL IN NEBRASKA BUT THEY ARE
MOVING INTO A LESS FAVORABLE ENVIRONMENT AS THEY CROSS THE MISSOURI
RIVER.  THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN WITH LOCAL
AREAS EXPERIENCING STRONG WIND GUSTS AND HAIL.

A SECONDARY COMPLEX OF STORMS OVER CENTRAL NEBRASKA WILL MAKE ITS WAY
INTO IOWA OVERNIGHT AND ESSENTIALLY MOVE OVER THE SAME AREA WITH THE
MAIN THREAT ONCE AGAIN BEING HEAVY RAIN.

PRECAUTIONS--EMERGENCY MANAGERS...ESPECIALLY OVER SOUTHWEST IOWA...
NEED TO BE ON THE ALERT FOR THE THREAT OF ADDITIONAL HEAVY RAINFALL
TONIGHT AND AGAIN TOWARDS DAYBREAK ON FRIDAY.

FAB

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-221100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
716 PM CDT THU MAY 21 1998

HAZARD--SCATTERED THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAIN...STRONG
WIND GUSTS AND LARGE HAIL.

TIMING DETAILS AND AREA OF CONCERN--THE WESTERN QUARTER OF IOWA THROUGH
10 PM AND THE SOUTHERN TWO TIERS OF IOWA COUNTIES FROM 10 PM TO
MIDNIGHT.  AN ADDITIONAL THREAT FOR REDEVELOPMENT OF STORMS TOWARDS
DAYBREAK.

METEOROLOGICAL COMMENTS-- THUNDERSTORMS HAVE DEVELOPED ALONG A BOUNDARY
OVER NORTHEASTERN NEBRASKA DURING THE LATE AFTERNOON HOURS.  THESE
STORMS WILL BE MOVING INTO FAR WESTERN IOWA BY 8 PM AND THEN ACROSS THE
WESTERN QUARTER OF THE WARNING AREA BEFORE HEADING TO THE SOUTHEAST.
THE STORMS WILL COVER A CORRIDOR FROM ABOUT STORM LAKE TO
DENISON...MOVING EAST TO ROUGHLY WEBSTER CITY THEN HEAD SOUTHEAST
TOWARDS CHARITON AND OTTUMWA LATER THIS EVENING.  THESE STORMS HAD A
HISTORY OF PRODUCING STRONG WIND AND LARGE HAIL IN NEBRASKA BUT THEY ARE
MOVING INTO A LESS FAVORABLE ENVIRONMENT AS THEY CROSS THE MISSOURI
RIVER.  THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN WITH LOCAL
AREAS EXPERIENCING STRONG WIND GUSTS AND HAIL.

A SECONDARY COMPLEX OF STORMS OVER CENTRAL NEBRASKA WILL MAKE ITS WAY
INTO IOWA OVERNIGHT AND ESSENTIALLY MOVE OVER THE SAME AREA WITH THE
MAIN THREAT ONCE AGAIN BEING HEAVY RAIN.

PRECAUTIONS--EMERGENCY MANAGERS...ESPECIALLY OVER SOUTHWEST IOWA...
NEED TO BE ON THE ALERT FOR THE THREAT OF ADDITIONAL HEAVY RAINFALL
TONIGHT AND AGAIN TOWARDS DAYBREAK ON FRIDAY.

FAB

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-221100-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
717 PM CDT THU MAY 21 1998

HAZARD--SCATTERED THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAIN...STRONG
WIND GUSTS AND LARGE HAIL.

TIMING DETAILS AND AREA OF CONCERN--THE WESTERN QUARTER OF IOWA THROUGH
10 PM AND THE SOUTHERN TWO TIERS OF IOWA COUNTIES FROM 10 PM TO
MIDNIGHT.  THERE IS ALSO AN ADDITIONAL THREAT FOR REDEVELOPMENT OF
STORMS TOWARDS DAYBREAK.

METEOROLOGICAL COMMENTS-- THUNDERSTORMS HAVE DEVELOPED ALONG A BOUNDARY
OVER NORTHEASTERN NEBRASKA DURING THE LATE AFTERNOON HOURS.  THESE
STORMS WILL BE MOVING INTO FAR WESTERN IOWA BY 8 PM AND THEN ACROSS THE
WESTERN QUARTER OF THE WARNING AREA BEFORE HEADING TO THE SOUTHEAST.
THE STORMS WILL COVER A CORRIDOR FROM ABOUT STORM LAKE TO
DENISON...MOVING EAST TO ROUGHLY WEBSTER CITY THEN HEAD SOUTHEAST
TOWARDS CHARITON AND OTTUMWA LATER THIS EVENING.  THESE STORMS HAD A
HISTORY OF PRODUCING STRONG WIND AND LARGE HAIL IN NEBRASKA BUT THEY ARE
MOVING INTO A LESS FAVORABLE ENVIRONMENT AS THEY CROSS THE MISSOURI
RIVER.  THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN WITH LOCAL
AREAS EXPERIENCING STRONG WIND GUSTS AND HAIL.

A SECONDARY COMPLEX OF STORMS OVER CENTRAL NEBRASKA WILL MAKE ITS WAY
INTO IOWA OVERNIGHT AND ESSENTIALLY MOVE OVER THE SAME AREA WITH THE
MAIN THREAT ONCE AGAIN BEING HEAVY RAIN.

PRECAUTIONS--EMERGENCY MANAGERS...ESPECIALLY OVER SOUTHWEST IOWA...
NEED TO BE ON THE ALERT FOR THE THREAT OF ADDITIONAL HEAVY RAINFALL
TONIGHT AND AGAIN TOWARDS DAYBREAK ON FRIDAY.

FAB

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-221045-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1141 PM CDT THU MAY 21 1998

HAZARD--AN OUTBREAK OF SEVERE THUNDERSTORMS PRODUCING WIND GUSTS TO 80
MPH. HAIL UP TO GOLFBALL SIZE AND AN ISOLATED TORNADO CANNOT BE RULED
OUT.

AREA OF CONCERN--SOUTH OF INTERSTATE 80.

TIMING DETAILS--THROUGH 700 AM FRIDAY MORNING.

METEOROLOGICAL COMMENTS--AN INTENSE BOW ECHO HAS ALREADY PRODUCED
WIDESPREAD WIND DAMAGE OVER SOUTHWEST AND SOUTH CENTRAL IOWA WITH GUSTS
AS HIGH AS 80 MPH. WHILE THIS BOW ECHO MARCHES INTO SOUTHEAST IOWA...
ANOTHER BOW ECHO WAS DEVELOPING OVER EASTERN NEBRASKA. THIS ONE APPEARS
TO BE JUST AS STRONG AND HAS HAD A HISTORY OF PRODUCING SOFTBALL SIZED-
HAIL AND ISOLATED TORNADOES. AS THE NIGHT WEARS ON...THE HAIL THREAT
WITH THIS NEW SQUALL LINE SHOULD DIMINISH BUT INCREASING WINDS ALOFT
WILL ENHANCE THE POTENTIAL FOR DAMAGING WINDS. MANY AREAS THAT HAVE
STRUCK ALREADY THIS EVENING ARE LIKELY TO BE HIT YET AGAIN OVERNIGHT.
SINCE WINDS ARE GETTING STRONGER ALOFT...THIS SECOND BOW ECHO MAY STILL
BE STRONG ENOUGH TO SPIN UP A TORNADO OR TWO...ESPECIALLY ON THE NORTH
END OF THE BOW ECHOES.

PRECAUTIONS--A TORNADO WATCH IS IN EFFECT FOR SOUTHWEST IOWA...AND A
SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SOUTHEAST IOWA UNTIL 500 AM.
THIS IS A PARTICULARLY DANGEROUS SITUATION SINCE MANY PEOPLE MAY SLEEP
THROUGH THIS SEVERE WEATHER AND NOT REACT IN TIME TO THE DANGER. TAKE
COVER IF STRONG WINDS DEVELOP IN YOUR AREA AND MONITOR WEATHER
RADIO...TELEVISION AND COMMERCIAL RADIO OVERNIGHT.

PYTLAK