September Air Mass Hanging Around

After breaking a record low this morning, temperatures will “near” record low levels again tonight.

LOWS (1)

The record this morning was smashed by 3° and paved the way for a near record “low maximum” this afternoon.  The official high in Indy hit 73°… which is more than 10° below normal and tied 1994 for the coolest Brickyard 400 ever.  This was only the 5th Brickyard in 20 years with a sub-80° high.

highs_today EVENT

Like clockwork…the extensive cumulus cloud deck will diminish after sunset as atmospheric lapse rates ease.  Lack of clouds and a fading wind allows near maximum raditional cooling tonight.  Once again temperatures by Monday morning will feel more like late September.


The record low of 51° set in 1881 should be safe… but not by much.

morningplanner plannerpm

The hour-by-hour planner shows a bright start and quick warm up into the upper 60s by noon.  Daytime heating and cold air aloft again triggers scattered to numerous cumulus clouds during peak heating.  Highs will be a few degrees warmer in the mid 70s and Monday is the pick of the week for sure!


The closed cold-core low over the Great Lakes signifies a trend in the long range pattern… that model guidance suggests will be a dominant feature over the next 8 to 12 days.  This results in below to perhaps much below temperatures across central Indiana the first full week of August.  Stay tuned to see if this pattern holds.


FutureTrak 13 shows our next rain maker looming to our west by Tuesday morning.  This wave of rain and storms most likely arrives later Tuesday and may linger into Wednesday.

RPM_2 RPM_3 7day (1)

After Wednesday it appears that next Saturday will be our next “best” chance of precipitation.  Notice that daytime highs return to the 70s next Sunday… a result of the upper level pattern I discussed earlier in the blog.  Thanks for reading the blog and a have a great evening – Sean Ash