FALL SURGES BACK TO INDIANA
Summer heat returned again Tuesday as temps reached the lower 90’s, the 42nd time this season – most since the Summer of 1988. Officially 92° in Indianapolis with lower 90’s reported at many nearby locations. The average high is 79°, well above normal but this month is having a hard time of finding the middle. The month opened with three days of near 100° temps –actually hit 100° on the third, but much of last week the high temps were only in the 60’s – more typical for late October. The wild swings continue again when two cold fronts pass in under 24 hours.
COLD FRONT #1
Passes this evening with winds shifting northwest to northeast later tonight the thermometer will slip into the upper 50’s by Wednesday morning.
Passes early Wednesday – thickening clouds and light rain will develop across the area as the day progresses – temps Wednesday will only reach the upper 60’s during the afternoon and possibly slide downward when rain showers move in.
COLDEST AIR OF THE SEASON
While last week’s run of 60° temps were cool for this time of the year – cloud cover prevented overnight temps from falling out of the 50’s. The air this week has a different origin – central Canada – and a product of shortened days and longer nights. Since June 21st we have lost 2 hours of daylight, September alone will lose 1 hour and 15 minutes. The longer nights allow the Fall chill to build in the northern latitudes – and a chunk of that cool air settles south Wednesday night. The expansive high pressure from Canada will drive the barometer up over 30” and drive overnight temps in to the upper 30’s and lower 40’s later this week. Outlying areas may dip into the upper 30’s and possible patch frost could develop. Frost and Freeze advisories have been posted across much of the Upper Midwest Tuesday night.