Category: Weather Rambles

Long Range Rambles On Iron Bowl Saturday…

Updated 11.27.21 @ 5:56a

The theme of the better part of the autumn season has been a story of contradicting signals- teleconnections and MJO alike. When we look ahead to the beginning of meteorological winter (Dec. 1st), it sure appears that will continue to be the story. For a brief moment the East Pacific Oscillation (EPO) tries to go negative. This is interesting in and of itself as only a couple days ago the EPO was forecast positive during this period.

Meanwhile, the PNA is forecast negative to open the month.

The “wildcard” in this entire December outcome has to do with the MJO. If (still a big if) we can get things to amplify, then a whip around the historically December cold phases (7, 8, and 1) appear in order.

If the MJO doesn’t get in the game, the pattern, at best, will be one of continued transition (colder and warmer than normal periods) and that’s what the majority of ensemble guidance currently shows. Without a favorable MJO, it’s tough to see how meaningful, more sustained arctic air can get into the mix, locally.

As far as storm systems of note, we’re in an incredibly quiet period and that looks to continue through the upcoming 5-6 days. We’ll keep eyes to our north where weak systems will zip by in the fast flow aloft, but most, if not all, of these should remain to our north and east. It’s not until early next weekend (looks like Friday or early Saturday as of now) when our next system of more significance is slated to impact the area.

War Eagle and happy Iron Bowl Saturday! 😀

Permanent link to this article: https://indywx.com/2021/11/27/long-range-rambles-on-iron-bowl-saturday/

Wednesday Morning Rambles: Not Finished With Those 80s…

Updated 10.06.21 @ 9a I. Unsettled conditions will continue through the end of the work week. A “cut off” low pressure system will begin to lift north today and pull…

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Permanent link to this article: https://indywx.com/2021/10/06/wednesday-morning-rambles-10/

VIDEO: Initial Thoughts Around Winter 2021-2022…

Updated 09.19.21 @ 10:20a

As the first strong autumn cold front takes aim on the region, it’s time to start thinking more about what lies ahead in the December-February time frame. This morning’s video dives in with some initial thoughts around just that. Is the CFSv2 seasonal precipitation projection an indication of the active winter storm track ahead? We think so…

Permanent link to this article: https://indywx.com/2021/09/19/video-initial-thoughts-around-winter-2021-2022/

Winds Of Change On The Doorstep…

Updated 08.31.21 @ 8:11a

We have one more day of humid conditions, but a wholesale pattern change will have things feeling much different around these parts beginning tomorrow, and continuing for the foreseeable future.

Note the drier air beginning to invade northern portions of IL, IN, and OH this morning. While dew points are still stuck in the mid-upper 60s, locally, that less humid air is heading south.

Note how the trough really amplifies next week across the eastern portion of the country. This will pull down an extended stretch of cooler, less humid air as we move through the better part of the first half of September.

A reinforcing cold front will sweep through here Saturday (yes, we’re giving in to building rain and storm chances into our Saturday forecast) with unsettled conditions.

This is likely going to set the stage for an overall wetter, cooler stretch of weather next week. Additional rain chances will arrive Tuesday and Thursday of next week.

8 of the past 10 days featured highs at or above the 90° mark, and was easily the hottest stretch of the summer. Looking ahead, a “hint” of fall shows up on the medium range charts just in time for us to kick off meteorological fall (officially, tomorrow).

Much more later, including our September Outlook…

Permanent link to this article: https://indywx.com/2021/08/31/winds-of-change-on-the-doorstep/

Saturday Morning Rambles: Changes On The Horizon; Unseasonably Cool Open To July?

Updated 06.19.21 @ 7:58a (We’ll have a full video discussion posted later this morning, but here are some headlines grabbing our focus into early July). I. Tropical, Soupy Airmass Remains…

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Permanent link to this article: https://indywx.com/2021/06/19/saturday-morning-rambles-changes-on-the-horizon-unseasonably-cool-open-to-july/

Dinnertime Rambles: Dangerous Weather Moves Through Overnight…

Updated 03.25.21 @ 5:45p So far, Indiana has made it through today without little in the way of significant weather. Unfortunately, that won’t be the case through the evening and…

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Permanent link to this article: https://indywx.com/2021/03/25/dinnertime-rambles-dangerous-weather-moves-through-overnight/

We’ve Seen This Before…

Updated 02.20.21 @ 8:29a

Before we dive into the challenges late next week, the potential is still very much alive and kicking for a period of slick conditions to develop Sunday evening/ night. While we’ll likely be in the middle 30s during the majority of the time this light precipitation is falling, the concern remains, given the duration and magnitude of the cold air (ground is now reported frozen “8 to 12”), that any liquid precipitation that falls will freeze on untreated area roadways and sidewalks. If you have travel plans Sunday night, plan to give yourself plenty of extra time.

Light rain should arrive between 8p and 10p (west to east across the state) Sunday before ending as a bit of light snow (little to no accumulation expected as of now). Total precipitation should be 0.20″ or less for most with this event.

As we look ahead, the next item of possible trouble awaits for mid and late week. A cold front will push south of the area Wednesday night into Thursday morning. While this may generate a brief period of light rain transitioning to light snow, it’s what follows that’s of more interest.

Operational guidance (both the European and GFS) suggest this late week system will present a winter storm for our friends in the TN Valley, but we advise to tread with caution for now.

The reason? A strongly negative PNA.

You know the drill by now. This should lead to a more stubborn southeastern ridge and subsequent further north storm track.

Height anomalies during a (-) PNA period.

Over time, I’d suspect we’ll see just that- the models trending further north with this particular storm system.

As it is, ensemble guidance is already significantly further north than their respective operational counterparts. At the very least, another interesting case study is in front of us…

Stay tuned!

Permanent link to this article: https://indywx.com/2021/02/20/weve-seen-this-before/

Reasons For (And Against) The “Big One” Next Week…

Updated 02.10.21 @ 6:23p

Before we look ahead, snow continues to fall across most of central Indiana. So far, immediate downtown Indy has avoided significant snow, but other areas are approaching 1″ to 2″ already as of this post. We continue to believe another band of snow will organize during the overnight into the predawn hours across central Indiana (especially along and north of the I-70 corridor). Given how cold it’s been as of late, even the lightest snow is creating havoc on area roadways. As winds become gusty, blowing and drifting issues will remain into the day Thursday.

As we look ahead, this pattern remains nothing short of remarkable. Feb. 5th (last Friday at 6p) was the last time Indianapolis was above the freezing mark. As we look ahead, we’re likely talking about another 12 days below freezing (if not longer). The “moderation” that some models are hinting at after that time frame isn’t something I’d label as high confidence at this point. That’s rare territory for central Indiana- even during some of the infamous cold winters of the “good ole days.” There’s also already been a fair share of snow events in this pattern. Sure the big one hasn’t hit (yet), but many across the state are getting used to clearing snow off the sidewalk and driveway on a daily basis. Not counting today’s snow, Indianapolis, officially, sits at 2.3″ month-to-date. Areas downstate received as much as half a foot (or more) earlier this week. As we look ahead, there’s a lot more white gold where that came from. (Keep in mind, the “average” snow total during the month of February in Indianapolis is 6.5″).

A fresh intrusion of arctic air will arrive just in time for the weekend. We’re looking at a mostly dry stretch of weather through the weekend, with the exception of some light snow prospects Saturday. Again, given how cold it’s been, even these light snow events will likely create travel trouble.

The coldest morning appears to be Sunday with lows falling to between 3° and 6° below zero. Wind chill values will approach 20° below zero, or worse, in spots.

By this time, all eyes will be on the developing storm system in the northwest Gulf of Mexico. There’s already been a great deal of chatter about this storm and that will only continue to ramp up as we move forward. Given the overall pattern and model consensus at this juncture, there’s plenty reason to believe the Ohio Valley, including central Indiana, is in store for a significant winter storm early next week.

With that said, nothing is a lock in this business. While the negative PNA (image 1 below) argues for the southeast ridge to “flex” it’s muscle and lead to a more inland track, the fact arctic air will be pressing southeast (image 2 below) does at least raise an eyebrow for potential shifts southeast in time over the next couple of days. It’s another fascinating meteorological battle we’ll have the pleasure to watch unfold in real time.

As it sits right now, we favor a storm track that will be far enough west to put central Indiana in play for potentially significant wintry precipitation (far too early to throw numbers out). The early call is for surface low to move out of the northwest Gulf and track west of the mountains before a secondary low take over along the Mid-Atlantic and moves northeast off the New England coast.

If this wasn’t enough, another storm system likely follows later next week that could also produce additional wintry “goods.”

Will every storm produce in your backyard? Negative. That said, when we get to March 1st, central Indiana winter weather fans are likely to look back on February 2021 as a truly special ride.

I suppose time will tell…

Permanent link to this article: https://indywx.com/2021/02/10/reasons-for-and-against-the-big-one-next-week/

Buckle In…

Updated 02.05.21 @ 7:18a

Where to begin?! Simply put, the pattern over the next 2 weeks is a winter weather lover’s dream setup. Does that mean central Indiana has to “cash in” on every event? Negative. In fact, by next weekend, we believe the Deep South will even get in on the wintry fun (outside of the higher elevations that have been doing quite well this year). That said, systems will be targeting our general area fast and furious and require us to remain on our toes. Given that a more prolonged period of cold is developing, we should be able to build a nice snowpack for outdoor winter enthusiasts over the next 7-14 days.

The setup is all thanks to a persistent negative to deeply negative AO and the associated high latitude blocking. The Pacific pattern is also changing to allow more meaningful cold (truly arctic air is getting involved in the pattern) into the East with staying power. We can thank the now negative EPO for that. That leads us to the PNA. A negative to even neutral PNA will continue to put resistance on the pattern and result in southern ridging at times. That’s especially true early on in this regime. That puts the Ohio Valley in the cross hairs of these systems. As the arctic air takes hold, I still believe eventually we’ll see a more suppressed storm track for a time but that likely doesn’t develop until late next week. Before that, we have multiple storms to track and a snowpack to build. 🙂

First up is an arctic wave that arrives Saturday evening. This is a system that should deposit 1” to 3” of snow, mainly from Indianapolis and points north (dusting up to 1” across the southern half of the state). This will be a fast moving system that will arrive around 5p across western parts of the state and will be out of here during the predawn hours Sunday.

Temperatures will crash Sunday morning into the single digits and highs will likely only climb into the middle teens. Good thing there’s a Super Bowl to focus on.

Additional upper level energy will result in light snow moving back in here Monday afternoon and night. With cold, arctic air in place, this system should be able to squeeze out an additional dusting to inch of snow (even as weak as it is).

That leads us to Tuesday night and Wednesday. A surface wave is expected to develop in the Ark-la-tex region and lift northeast. This will be a “juicier” event and result in widespread wintry precipitation across the state. Early thinking here is that across central and northern parts of the state, this will be mainly a snow event. Southern portions of the state may mix with sleet and/ or freezing rain. While we can’t throw out numbers this early, where it stays all snow, several inches seem likely.

If that’s not enough, more “fun and games” are dialed up with yet another system next Thursday and Friday. This, too, could be a meaningful winter event, locally, and will require close attention moving forward.

From a temperature perspective, it continues to look like a case of “delayed but not denied” on the topic of truly dangerous arctic air. As the pattern evolves and a snowpack is established, the concern here is that we’re looking at a period of severe cold (double digit below zero temperatures and wind chill values exceeding 20° below zero) by late next week/ next weekend.

More later today! Have a great Friday, friends!

Permanent link to this article: https://indywx.com/2021/02/05/buckle-in/

Troubling Pattern To Close November; Open December…

This morning is once again reminding us that we can deal with wintry “issues” at times even in the midst of an overall mild pattern. As we move down the road, it sure appears as if additional opportunities for wintry weather will present themselves as the pattern evolves towards more of a traditional regime to support such.

More specifically, we’re targeting the period between 11/30 and 12/10. Though still not a “textbook” pattern, the PNA is trending more positive with each run. This favors as eastern trough (example below).

Note how the upper pattern evolves in the coming couple of weeks:

You might be asking yourself, “what would take this pattern to lock-in and become more textbook?” We need the two positives (initially over Saskatchewan and Manitoba to “connect” with the one in the northwestern Atlantic). As it is, we do note the heights continue to build and push towards Greenland. I’m not sure we can pull it off, but the evolution towards a strong PNA can force the issue and eventually lead to a negative AO. Regardless of whether or not we get to that point, which would lead to a more long lasting colder/ stormy regime, I think we’ll have a minimum of 2 opportunities for eastern wintry “fun and games” during the aforementioned period above.

As we get into Week 2 (11/29-12/4), note how the pattern has the look of an active subtropical jet as the “horseshoe” block tries to get established over the top. This is likely still not an overly cold pattern, but one plenty capable of additional wintry fun, even with marginally cold air.

Stay tuned. The closer we get, the more specific we can be regarding the storms. From this distance, if I’m a fan of winter weather, you have to like where you’re sitting as we open up meteorological winter.

Permanent link to this article: https://indywx.com/2020/11/22/troubling-pattern-to-close-november-open-december/

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