Category Archives: Unseasonably Warm

Cool 6-10 Day Period Ahead, But Then What?

A strong cold front will sweep through the area tomorrow and help usher in the coolest air so far this autumn. This will set the tone, combined with the recurving WPAC typhoon, for a chilly upcoming 6-10 day period, but what lies beyond this period later in the month?

Recurving Super Typhoon Hagibis will promote reinforcing chill across our area next week.

We turn to a couple of our more trusted teleconnections for advice.

Note the PNA “bobbing” up and down through the medium range period, with more of a negative look around the 20th. This argues for a milder stretch of weather around that time. (Further out, we’ll keep close eyes on the PNA to see if a more consistent positive signal develops as we inch closer to November).

The EPO pops strongly positive mid month which, too, argues for milder times, locally. That said, similar to the PNA above, the EPO is trending towards a scenario that would present colder times as we rumble towards November. We’ll monitor for consistency.

To no surprise, given the two primary teleconnection drivers above (remember these can change as the seasons evolve), we see the pattern set to turn milder just beyond Day 10. Note the strong agreement between the European, Canadian, and GFS ensemble data below.

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Saturday Morning Rambles…

I. Our Saturday will get off to a stunning start. Despite some patchy fog here and there, look for plentiful sunshine and chilly temperatures in the low-mid 40s rising into the low-mid 70s for afternoon highs with increasing clouds.

II. Those increasing clouds will deliver showers by tonight across central Indiana and then more concentrated heavier rain downstate Sunday evening into the predawn Monday. Southern Indiana is needing a good soaking in a bad way and this system will at least help things slowly begin to improve…

Forecast radar 11p Saturday.
Forecast radar 9a Sunday.

Rainfall totals with this system across central Indiana should accumulate to the tune of 0.20 to 0.40 for most with heavier amounts approaching 1” across the IN-KY border.

Note this is where things are driest across the state per Thursday’s drought update.

III. Our next storm system will swing through here late in the work week. We’re timing Thursday PM into early Friday for a round of showers and potentially gusty thunderstorms as a cold front pushes through.

Behind this boundary, the coldest air of the fall so far will blow into town. We’re continuing to think many of the area can expect the first frost of the season next weekend.

IV. As we look ahead, it’s time to start putting more stock into other tools in the box. Case in point, the MJO is showing signs of less amplitude over the upcoming couple weeks followed by a strongly positive PNA. This supports colder signals in the period. We’ll dig in further in the days ahead.

No Comments Autumn, Client, First frost, Forecast Discussion, MJO, PNA, Rain, T-storms, Unseasonably Cool Weather, Unseasonably Warm, Weather Rambles