Category Archives: First Freeze

First Frost Of The Season Comes Right On Schedule…

The average date for the first frost and freeze in Indianapolis takes place on October 11th and 14th, respectively.  Right on cue, the first frost of the season will take place for most central Indiana neighborhoods over the weekend.  If you happen to miss out on the frosty conditions this week, reinforcing chilly air will descend on the region early next week.

We forecast (3) of the upcoming (7) nights to fall into the 30s.  This is, obviously, a significant change from the extended summer like conditions we’ve been dealing with as of late.  One primary driver behind the significantly cooler pattern has to do with the change in the PNA.  The shift towards a positive PNA will result in the cooler air remaining in place with more staying power than the fleeting cool shots of a few weeks ago.

A series of cold fronts will sweep through the Ohio Valley over the upcoming couple of weeks and each will likely feature progressively cooler conditions.

With the positive PNA in place, it’s no surprise to see the mean trough setting up shop over the eastern portion of the country.

At the surface, we see the cool pattern taking hold into not only the short-term, but the 10-15 day range, as well.

Autumn, First Freeze, First frost, Forecast Discussion, Forecast Models, Harvest'18, Long Range Discussion, PNA, Summer, Unseasonably Cool Weather, Unseasonably Warm

Cold Turn After A Warm Month; Unsettled Week Ahead…

The past (7) days has featured a cold turn through the central in the face of a warm October up to this point.

The upcoming few days will feature additional unseasonably chilly conditions before moderating through the second half of the week.

This will feature a hard freeze for central Indiana tonight.  We dipped to the first 32° temperature of the season here at IndyWx.com HQ this morning and will likely beat that Halloween morning.  Widespread upper 20s to around 30° can be expected.

This cold air is thanks to a cold front and reinforcing chill that will feature a band of showers that scoots through the state late morning into the early afternoon.

Rainfall amounts won’t be significant and feature totals between 0.10″ to 0.20″ through most of central Indiana.

Unsettled weather will return late week and through the upcoming weekend, but temperatures will moderate and return to levels that are above average.  There are indications cold will push again in the 8-10 day period, but a warmer pattern will engulf our region during the medium range period and feature temperatures that will reach the 60s by Thursday and Friday.

The warmer conditions will also come with rain.  A “wavy” cold front will approach late week with showers before returning north as a warm front late in the weekend.  Finally, this frontal boundary will push southeast early next week with cold air returning.  With the movement and stubborn nature of the front, expect a prolonged duration of unsettled conditions.  It won’t rain the entire time, but we’ll keep showers in our forecast beginning Wednesday into the weekend.

7-Day Outlook, Autumn, First Freeze, Forecast Discussion, Forecast Models, Halloween, Rain, Unseasonably Cool Weather, Unseasonably Warm