Very severe thunderstorms are possible later today in Iowa including a prety
good threat for tornadoes read bellow in the NWS Quad Cities Significant
Weather Outlook
SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 AM CDT TUE AUG 21 2001
...POTENTIAL FOR SEVERE WEATHER LATE TODAY AND TONIGHT...
A THUNDERSTORM COMPLEX IN THE PLAINS WILL DISSIPATE THIS MORNING
OVER WESTERN IOWA. OUTFLOW BOUNDARIES FROM THIS COMPLEX ARE EXPECTED
TO INTERACT WITH A WARM FRONT...RESULTING IN A NEW ROUND OF
THUNDERSTORMS LATE THIS AFTERNOON AND OVERNIGHT. BEHIND THE WARM
FRONT MOISTURE WAS PLENTIFUL...EVIDENT BY DEW POINTS IN THE MID 60S
ACROSS SOUTHERN MISSOURI.
WARM AIR ALOFT WILL KEEP THE ATMOSPHERE CAPPED THROUGH MID AFTERNOON.
DAYTIME HEATING COMBINED WITH INCREASED MOISTURE SHOULD BREAK THE CAP
NORTH OF THE WARM FRONT AROUND 4 PM...RESULTING IN EXPLOSIVE
THUNDERSTORM DEVELOPMENT. THE GREATEST THREAT OF SEVERE WEATHER
WILL BE NORTH OF INTERSTATE 80.
SUFFICIENT WIND SHEAR ALOFT IS FORECAST TO ALLOW SUPERCELLS OR
SQUALL LINES TO DEVELOP. THE PRIMARY THREAT IS EXPECTED TO BE
DAMAGING WINDS BUT TORNADOES AND LARGE HAIL ARE VERY POSSIBLE. THE
LIKELY TIME FOR SEVERE WEATHER SHOULD BE FROM 4 TO 10 PM. THE STORMS
ARE EXPECTED TO EVOLVE INTO A LARGE THUNDERSTORM COMPLEX AFTER 10
PM WITH DECREASING SEVERE POTENTIAL. HOWEVER ISOLATED DAMAGING WIND
AND HAIL WILL STILL BE POSSIBLE. LOCALLY HEAVY RAIN IS POSSIBLE
NORTH OF A BELLE PLAINE TO MILLEDGEVILLE LINE.
EMERGENCY MANAGERS SHOULD LISTEN TO LATER FORECASTS AS THE
POTENTIAL FOR AND TYPE OF SEVERE WEATHER BECOMES BETTER DEFINED.
SPOTTER ACTIVATION APPEARS POSSIBLE NORTH OF INTERSTATE 80 LATE THIS
AFTERNOON AND EVENING.
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