413 FPUS63 KDMX 290244 SFPIA IAZALL-290930- IOWA STATE FORECAST...UPDATE NATIONAL WEATHER SERVICE DES MOINES IA 947 PM CDT WED JUL 28 1999 ...A HEAT ADVISORY IS IN EFFECT TONIGHT AND THURSDAY FOR THE WESTERN TWO-THIRDS OF IOWA...AND THROUGH FRIDAY SOUTHEAST... .REST OF TONIGHT...MUGGY WITH MOSTLY CLEAR SKIES. A CHANCE OF THUNDERSTORMS NORTH LATE TONIGHT OR TOWARD MORNING. LOWS IN THE LOWER TO MIDDLE 70S. .THURSDAY...HOT AND HUMID WITH MOSTLY SUNNY SKIES. HIGHS IN THE 90S. .THURSDAY NIGHT...STILL MUGGY WITH MOSTLY CLEAR SKIES. LOWS IN THE LOWER TO MIDDLE 70S. .FRIDAY...MORE HEAT AND HUMIDITY. MOSTLY SUNNY WITH HIGHS IN THE 90S. .FRIDAY NIGHT...A CHANCE OF THUNDERSTORMS NORTHWEST...OTHERWISE WARM AND HUMID. LOWS IN THE UPPER 60S TO MIDDLE 70S. .EXTENDED FORECAST... .SATURDAY...A CHANCE OF SHOWERS AND THUNDERSTORMS. HIGHS IN THE MIDDLE 80S TO LOWER 90S. .SUNDAY...A CHANCE OF SHOWERS AND THUNDERSTORMS CENTRAL AND SOUTH. TURNING COOLER WITH LOWS IN THE 60S...AND HIGHS IN THE 80S. .MONDAY...A CHANCE OF SHOWERS AND THUNDERSTORMS FAR SOUTH...OTHERWISE NO PRECIPITATION. LOWS IN THE 60S. HIGHS IN THE UPPER 70S TO MIDDLE 80S. $$ KULA