Warmest September in 75 years takes a turn; Chilly pattern develops this week

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FIRST FRONT OF FALL

Skies cleared Monday after overnight storms and a wind shift.  A cold front has swept the state and swept away the unseasonably warm and humid air.  Temperatures late Monday cooled by as much as 20° from the same time Sunday.

Cooler air settles in tonight and with clear skies and lighter winds, for the first time since may 22 we are going to dip below 50° in Indianapolis.  it's late, the average first night below 50° is September 10th.

24 hour temperature change

24 hour temperature change

latest-hrrr-central-indiana-temps

 

FALL 2016 WARMEST IN 75 YEARS

Temperatures averaged below normal for the first time in  two weeks on Monday and failed to reach the 80 degree mark.  The incredible breakneck pace of the month is ending but not before propelling September 2016 and meteorological fall to the 9th warmest on record.  The average temperature of 73.3° is the warmest to date since 1941.  Meteorological fall (the months of September, October and November) currently have had 73% of the days above normal.

fall-temperatures

Fall 2016 has produced 19 days above normal (73%)

September 2016's average temperature is the warmest since 1941!

September 2016's average temperature is the warmest since 1941!

PATTERN CHANGE COMING

A real fall-like feel is in the works as we close out the month.  The upper level winds are changing and we are dropping off a closed circulating low pressure over the eastern U.S. for several days.  Beneath these "cutoff" lows, named because the main steering winds have left the low pressure behind, there is a daily shower chance and temperatures that will run much cooler than average.  High temperatures starting Wednesday will run near mid-October levels through Saturday, October's official open.

A cutoff low will linger over the eastern U.S. for several days

A cutoff low will linger over the eastern U.S. for several days