Category: CFSv2

Meteorological Fall Only 5 Days Away- Long Range Update Into Mid September…

Updated 08.26.21 @ 8:48a

Is there anything more polarizing than pumpkin spice products?! Count my house in favor of rolling these items out in late August. (I think my wife bought her first autumn candle of the year a few weeks ago and, rest assured, upon our return from the beautiful Gulf Coast, it will be lit almost immediately).

Despite the fact we’re in the hottest and most humid stretch of the summer (mind you, in a summer that really hasn’t been that bad from that from a heat perspective), we’re at a point where we’re shaving off nearly 2 and a half minutes of daylight per day.

As we look at the upcoming 3-4 weeks, the primary drivers still appear to be the EPO and MJO movement. Pardon us if you’re tired of hearing this word, but it’s still the best, in our opinion, when describing the upcoming several weeks: “transient.”

Consider the more amplified look to the MJO:

As well as the EPO:

Thinking here is that the EPO and MJO will work in tandem to drive a very transient regime over the next 3-4 weeks. Perhaps the past few days have been a hint of what’s to come with more appreciable precipitation into the “heart” of central Indiana- an area that, for the most part, missed out over the latter half of July and first half of August. Officially, Indianapolis is now only 0.89″ in the hole.

Let’s take a look at some of the more trusted medium-long range computer model guidance:

JMA Weeklies

Week 1

Week 2

Weeks 3-4

CFSv2

Weeks 1-2

Weeks 3-4

European Weeklies

Week 1

Week 2

Week 3

Week 4

The largest takeaway between the drivers (MJO and EPO) and computer guidance above is that we will inject a wetter regime back into the mix over the upcoming 2-4 weeks (especially compared to the past 4 weeks). While we’ll likely cool somewhat in early September, the pattern, as a whole, looks warmer than normal over the upcoming 2 to 4 weeks, locally. The opposite can be said for the northern Rockies as early winter conditions will make their presence felt during this period. It’ll be particularly interesting to see if the JMA is correct in driving that strong western trough in the Weeks 3-4 time period. Should that come to fruition, it would likely pump unseasonably hot conditions across the East during that time frame, but, eventually, a piece of that trough may shift east late month and set up a cooler regime to end September.

Regardless, be sure to enjoy that PSL… 🙂

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VIDEO: Timing Out Best Rain Chances In The Week Ahead; Additional Fall/ Winter Rambles…

Updated 08.06.21 @ 7:50a

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Long Range Update: Window Closes Almost As Soon As It Opens For Period Of Hotter Weather…

Updated 07.22.21 @ 7:35a

We’re in the midst of the “dog days,” however Summer ’21 has been anything but hot around these parts. July is running 2° below normal, month-to-date, and stretches of hotter weather have been transitional at best.

While the upcoming 6-10 days, as a whole, will offer up an opportunity for heat to build east, we don’t believe this hotter stretch will have staying power as we get deeper into August. Here’s why:

EPO: Note the rather dramatic reversal forecast over the upcoming couple of weeks. We go from a strong positive (now) to a strongly negative EPO state to close out July and open August. While there’s lag here (hence, the hotter days won’t arrive in earnest until early next week), the negative trend to open August will likely drive significant cooling from the Plains and into the Ohio Valley as we move through the first 10 days, or so, of the month.

MJO: While there are several questions pertaining to what phases the MJO will “camp out” in August, one thing that seems to be becoming clear is that we aren’t going to get stuck in the hot phases. Depending on if we recycle or head into the null phase, it sure seems like the MJO will favor the seasonable to cooler than normal phases through the bulk of the month.

Wet Ground: Long-time viewers of IndyWx.com know that we lean heavily on the precipitation pattern from May through July to at least serve as an ingredient in building our August forecast. Drier stretches of weather during these months can really “feedback” this time of year and serve to lead to hot closes to meteorological summer and open to meteorological fall. While it’s not the be all, end all, the opposite can usually be said for wetter years.

60-Day Precipitation Anomaly

While August, has a whole, has a cooler than normal look to it, the upcoming 6-10 days will feature true summer heat as the ridge temporarily builds east. Several days next week will likely top out in the 90° to 92° range with plenty of humidity.

The feeling here though is that the ridge will pull back and open the window up for cooler (relative to normal), more unsettled weather to return as we get through the first full week of August. In fact, note how the latest longer range guidance is already loading up on the precipitation for the remainder of summer.

Our complete August Outlook will be out next week.

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VIDEO: Drier Short-Term Trends…

Updated 07.20.21 @ 7:26a

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Long Range Update Through The 1st Half Of June…

Updated 05.27.21 @ 6:26p

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