424 AM CDT SUN SEP 6 2015

A FLASH FLOOD WATCH IS IN EFFECT FROM THIS EVENING THROUGH MONDAY MORNING FOR THE FOLLOWING COUNTIES: FREMONT; MILLS; MONTGOMERY; PAGE; POTTAWATTAMIE AND SHELBY.

HEAVY RAINFALL IS POSSIBLE IN SOUTHWEST IOWA TONIGHT. THUNDERSTORMS ARE FORECAST TO DEVELOP LATE THIS AFTERNOON AND CONTINUE OVERNIGHT AS A COLD FRONT MOVES INTO THE AREA. THAT  FRONT IS EXPECTED TO STALL IN SOUTHWEST IOWA…PROVIDING A FOCUS FOR CONTINUED DEVELOPMENT OVERNIGHT.

Counties in green are included in a Flash Flood Watch.

CONTINUED THUNDERSTORM DEVELOPMENT ALONG A STALLING COLD FRONT WILL LEAD TO SLOW-MOVING STORMS THAT COULD DROP RAINFALL AMOUNTS WELL OVER 2 INCHES IN A RELATIVELY SHORT PERIOD OF TIME. LOCAL RAIN AMOUNTS COULD EXCEED 4 INCHES. THE HEAVY RAINFALL COULD LEAD TO FLASH FLOODING OF ROADWAYS AND LOW WATER CROSSINGS. RAPID RISES IN SMALL CREEKS AND STREAMS COULD ALSO OCCUR.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.