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October 2018 archive
Permanent link to this article: https://indywx.com/2018/10/18/chilly-air-reinforcements-blow-in-this-weekend/
Oct 17
Chilly, But Quiet Pattern Continues (For Now)…
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Permanent link to this article: https://indywx.com/2018/10/17/chilly-but-quiet-pattern-continues-for-now/
Oct 16
Chilly, But Overall Dry Pattern Until Perhaps Around Halloween…
The short and medium range weather pattern will be highlighted by a colder than average regime, but one that’s also drier than normal.
A cooler than average, but drier than normal pattern will remain in place through the upcoming (10) days. Image courtesy of Weathermodels.com.
A few weak weather makers will scoot through the region over the upcoming (10) days, but be moisture starved. Image courtesy of Weathermodels.com.
After a warm open to October, the sustained period of chilly air is welcome by many. Image courtesy of Weathermodels.com.
The positive PNA will continue to support the mean trough position in the central and eastern portion of the country as we rumble into late October.
As we look ahead, there are growing indications a more significant storm may impact the general region as we get closer to Halloween. This is the next time frame we’re closely monitoring for the potential of an impactful storm system. Given the overall setup, we would be surprised if this particular storm didn’t present a wintry side, as well, but it’s simply too early to know the details from a couple of weeks out. Stay tuned.
Potential is present for “fun and games” around Halloween… Image courtesy of Weathermodels.com.
Permanent link to this article: https://indywx.com/2018/10/16/chilly-but-overall-dry-pattern-until-perhaps-around-halloween/
Oct 14
Eyeing The First Freeze Of The Season Late Next Week…
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Permanent link to this article: https://indywx.com/2018/10/14/eyeing-the-first-freeze-of-the-season-late-next-week/
Permanent link to this article: https://indywx.com/2018/10/12/flipping-the-script-from-the-warm-open-to-fall/
Oct 10
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.
Permanent link to this article: https://indywx.com/2018/10/10/first-frost-of-the-season-comes-right-on-schedule/
Oct 09
Fall Arrives In Earnest Here…
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Permanent link to this article: https://indywx.com/2018/10/09/fall-arrives-in-earnest-here/
Oct 08
One More Summer-Like Day Before A Big Change…
High pressure and warm southwesterly winds will lead to one more summer-like day before significant changes take place. Plentiful sunshine can be expected Tuesday with temperatures closer to a record high (88° set in 1939) than the average of 68°.
A cold front will sweep through the region Wednesday evening and will lead to a better chance of more concentrated showers and thunderstorms for our hump day. Precipitable water values (PWATs) will approach 2″ Wednesday afternoon which is almost unheard of by October standards. As a result, a couple of the storms may be accompanied by locally heavy rainfall.
Winds of change will be blowing in earnest Wednesday night and Thursday morning and a legit fall feel will greet us out the door! Most of central Indiana can expect temperatures to be falling into the 40s Thursday morning along with a nice northwest breeze.
Longer term, a new storm system (including remnant moisture from Sergio) is expected to impact our weekend weather. We’ll trend our forecast wetter with reviewing some of the latest data. Sunday appears to be the wettest day.
An even more impressive push of fall air will follow on the heels of Sergio’s remnants early next week, including the potential of frost for more of the Ohio Valley, including central Indiana.
Permanent link to this article: https://indywx.com/2018/10/08/one-more-summer-like-day-before-a-big-change/
Oct 08
Watching Michael; November-Like Pattern Looms…
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Permanent link to this article: https://indywx.com/2018/10/08/watching-michael-november-like-pattern-looms/
Oct 07
Looking At The Week Ahead: Significant Changes To A MUCH Cooler Pattern Loom…
We’re opening the new week with the same old unseasonably warm and muggy weather pattern that was with us the majority of last week, but significant changes loom during the week ahead. Ultimately, summer will be laid to rest (finally) and a legitimate, “stick and hold” fall pattern will take hold. The transition will feature a “game changer” of a midweek cold front that will take us from an August to a November feel in as little as 24 hours. Here are some highlights between now and then:
I. A strong ridge will continue to promote an unseasonably warm and muggy feel by early-October standards. Scattered “splash and dash” storms are possible through the early portion of the week, but organized significant rain isn’t anticipated.
II. TD 14 will strengthen into Tropical Storm Michael later today and eventually a hurricane before making landfall along the Florida panhandle during the middle of the week. The remnant moisture of Michael will then race northeast and impact the flood-ravaged Carolinas during the latter stages of the work week.
III. As Michael’s remnant moisture tracks northeast into the Carolinas, a strong cold front will sweep through the Mid West and Ohio Valley. Better chances of organized showers and thunderstorms will arrive ahead of the front Wednesday. Once the front passes, a dramatic wind shift to the northwest will push a MUCH cooler and drier air mass into the region.
IV. We note the PNA (Pacific North America pattern) is flipping to a positive state and that will drive a more sustained period of colder air during the medium and longer range period- or mid and late October.
The air will grow cold enough to support the potential of frost during the 5-10 day period on at least a couple of nights. Additionally, reinforcing chilly air may ignite the lake effect to our north and northeast during Week 2… “Times, they are a changing!”
Permanent link to this article: https://indywx.com/2018/10/07/looking-at-the-week-ahead-significant-changes-to-a-much-cooler-pattern-loom/