12 JULY 2010 EXTENDED FORECAST

12 JULY 2010 EXTENDED FORECAST

TODAY 12TH - INCREASING CLOUDS WITH ISOLATED TSHOWERS IN POW COUNTY BETWEEN NOON AND 2PM AND DIMINISHING AFTER SUNSET - TEMP 80

TUESDAY 13TH - PARTLY CLOUDY - GUSTY SOUTH WIND - TEMP 85

WEDNESDAY AND THURSDAY 14TH/15TH - HUMID - PARTLY CLOUDY WITH GUSTY SOUTHWEST WIND - THEN MOSTLY CLOUDY WITH THUNDERSTORMS (SEVERE) DEVELOPING AFTERNOON WEDNESDAY AND LASTING INTO THURSDAY MORNING - TEMPS LOW 90'S - HEAT INDEX 100/105F

FRIDAY 16TH - PARTLY CLOUDY - TEMP NEAR 90

SATURDAY THRU MONDAY 17TH THRU 19TH - ISOLATED TSHOWERS MAINLY IN THE AFTERNOON - TEMPS LOW 90'S

A COLD FRONT EXTENDING SOUTH OUT OF MICHIGAN - SOUTHWEST THROUGH SOUTHEAST IOWA - AND INTO LOW PRESSURE OVER SOUTHWEST KANSAS WILL MOVE SOUTHEAST TONIGHT. HIGH PRESSURE OVER NORTH DAKOTA WILL BUILD SOUTH INTO NORTHERN IOWA BY LATER TONIGHT AND TUESDAY. ANOTHER COLD FRONT WILL APPROACH BY WEDNESDAY AFTERNOON.

SHOWERS AND THUNDERSTORMS WILL OCCUR ALONG AND TO THE NORTH OF THE COLD FRONT TODAY ACROSS IOWA AND AREAS EAST...SOUTH...AND WEST. PARTLY CLOUDY CONDITIONS ARE EXPECTED OVER FAR NORTHERN IOWA AND AREAS NORTH.

DRIER WEATHER IS EXPECTED OVER MOST OF IOWA TUESDAY AND TUESDAY NIGHT WITH HIGH PRESSURE BUILDING INTO THE REGION. AS THE HIGH MOVES OFF TO THE EAST...SOUTH WINDS WILL DRAW WARMER AND MORE HUMID AIR IN BY WEDNESDAY.

ANOTHER ROUND OF THUNDERSTORMS IS FORECAST WITH THE PASSAGE OF THE NEXT FRONTAL SYSTEM LATE WEDNESDAY INTO THURSDAY. SEVERE WEATHER WILL OCCUR IN NORTHWEST OF IOWA TUESDAY NIGHT. THE SEVERE WEATHER THREAT WILL OVERSPREAD ALL OF IOWA LATE WEDNESDAY AND WEDNESDAY NIGHT.

WEAK HIGH PRESSURE WILL BUILD EAST INTO IOWA LATER THURSDAY AND FRIDAY CLEARING US OUT - HOT AND HUMID REMAINS....THE WEEKEND OF THE 17TH APPEARS UNSTABLE AGAIN AS LOW PRESSURE DEVELOPS IN KANSAS ALONG A WEAK WARM FRONT THAT WILL EXTEND INTO EXTREME SOUTHERN IOWA........