Severe Thunderstorm Warning 35, NWS Des Moines, IA

IAZALL-180330-

CENTRAL IOWA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
824 PM CDT FRI MAY 17 1996

HAZARD...SEVERE THUNDERSTORMS WITH DAMAGING WINDS OF 60 MPH OT
GREATER AND LARGE HAIL - UP TO THREE DIAMETER.  ISOLATED TORNADOES
ARE POSSIBLE.

AREA OF CONCERN...GREATEST AREA OF CONCERN UNTIL 11 PM CDT IS WEST
OF A LINE FROM SHENANDOAH TO FORT DODGE TO MASON CITY.  CENTRAL
PORTION OF THE STATE COULD RECEIVE ISOLATED DAMAGING WINDS AFTER 9
PM CDT.

TIMING DETAILS...STORMS IN WEST CENTRAL IOWA WILL MOVE NORTHEAST
THROUGH THE AREA OF GREAT CONCERN AND INTO NORTH CENTRAL IOWA BEFORE
MIDNIGHT.  STORMS IN CENTRAL IOWA ARE NOT EXPECTED UNTIL AFTER 9 PM
CDT OR LATER.

METEOROLOGICAL COMMENTS...VERY UNSTABLE AIR REMAINS OVER THE STATE
HOWEVER VERY WARM AIR ALOFT IS KEEPING MUCH OF THE AREAS CAPPED AND
INHIBITING DEVELOPMENT.  HOWEVER AS A COLD FRONT PUSHES INTO FARTHER
INTO THE STATE THIS CAP WILL BE OVERCOME AND DEVELOPMENT IS LIKELY.
AT THE SAME TIME A FAIRLY STRONG JET WILL TRACK OVER THE AREA AND
FURTHER ENHANCE THE LIKELIHOOD OF DEVELOPMENT DESPITE THE TIME OF
DAY.  UPPER LEVEL WINDS CONTINUE TO SHOW WEAK DYNAMICS FAVORABLE
FOR TORNADIC DEVELOPMENT.  INSTEAD THE WIND PROFILE FAVORS DAMGING
STRAIGHT LINE WINDS.

PRECAUTIONS...EMERGENCY MANAGERS MAY CONTINUE TO MONITOR THE LATEST
FORECASTS AND STATEMENTS OUTSIDE THE WATCH AREA.  INSIDE THE WATCH
AREA COUNTIES IN WEST CENTRAL IOWA CAN EXPECT STORMS OVER THE NEXT
FEW HOURS.

IAZ004>007-015>017-023>028-035-180345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1012 PM CDT FRI MAY 17 1996

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WEBSTER COUNTY
WILL EXPIRE AT 1020 PM...

THE SEVERE THUNDERSTORM THAT PRODUCED GOLF BALL SIZE HAIL IN
SOUTHWEST WEBSTER COUNTY HAD DECREASED IN INTENSITY AS OF 1015 PM.
THE SEVERE THUNDERSTORM WARNING FOR WEBSER COUNTY WILL EXPIRE AT
1020 PM.

FELDT

IAZ004>007-015>017-023>028-035-036-180515-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1139 PM CDT FRI MAY 17 1996

...THE SEVERE THUNDERSTORM WARNINGS FOR CALHOUN AND WEBSTER
COUNTIES HAVE BEEN CANCELLED...

AT 1135 PM A VERY STRONG THUNDERSTORM EXTENDED FROM SOUTHEAST
WEBSTER COUNTY NEAR LEHIGH TOWARDS EAGLE GROVE IN SOUTHWEST WRIGHT
COUNTY TO NEAR DAKOTA CITY IN HUMBOLT COUNTY.

MANY REPORTS OF HAIL AROUND 1/2 INCH HAVE BEEN RECEIVED IN THIS
AREA.

BETWEEN 1140 AND MIDNIGHT...THIS STRONG THUNDERSTORM WILL MOVE
ACROSS HUMBOLT AND WRIGHT COUNTIES.

THESE STROMS ARE PRODUCING A PERIOD OF VERY HEAVY RAIN...HAIL AND
GUSTY WINDS AS THEY MOVE NORTHEAST AT 40 MPH. IF YlOU ARE IN THIS
AREA...KEEP ALERT AND BE PREPARED TO MOVE TO A SAFE SPOT IF SEVERE
WEATHER IS OBSERVED.