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Aug
13

Near Record Lows Tonight

By · August 13, 2013 at 6:45 pm

A breezy northwest wind continues to push September-like air into central Indiana… setting the stage for an unseasonably cold night.

EVENT

INDIANS_2

If you’re heading out to the Indiana State Fair or Indians game you may consider packing a light coat or long sleeves.  Temperatures will dip into the 60s by 9pm.

As the wind diminishes tonight, and clouds clear, temperatures will drop rapidly.  The low temperature map below is more indicative of mid-September.  Notice Indianapolis will be very close the record low of 48° set in 1964.  This will be the coldest August night since 2009, and the last time temps dropped into the 40s during the month was 2004.

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Despite the cool start, it will be another picturesque day at the fairgrounds.  Highs slowly climb into the mid 70s… a good 10° below normal.

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This is part of a four day stretch of below normal highs that rolls into Friday afternoon.

RPM

The flow around low pressure sitting over SE Canada is the delivery mechanism of the fall air mass.

RPM_1

High pressure and Canadian air continue to claim a large chunk of real estate across the Ohio Valley and Great Lakes late week…with cool nights and mild afternoons as a result.

JETSTREAM

Don’t be fooled by our time north of the Polar Jet… summer’s not done!  Long-range guidance continues to support the notion of a flattening upper-level flow heading into the weekend.  Though we initially avoid the hot dome, more typical August returns well into next week.  It’s to be determined whether or not the upper ridge (and hotter air) makes east of the Mississippi River later in the month.

JETSTREAM_2

To recap… we’re going from near record lows to the mid 80s in the latest 7 day forecast.  Late in the period we’ll have to monitor potential tropical moisture for local impact, which is leading to the “scattered” chances of precip Sunday into Tuesday.

7day_2

Have a great evening and thanks for reading the blog – Sean Ash

 

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