Category: Thanksgiving

Strong Storm Potential By Evening; More Chatter About Late Weekend-Next Week…

It’s a wet morning across central Indiana as widespread rain (some of which is moderate to heavy) is falling for most of the region. This is due to a well organized low pressure system and associated frontal boundary currently spinning across the central Plains.

As the widespread shield of rain departs late morning and into the early afternoon hours, we’ll have a “lull” in the activity until late afternoon and early evening. That’s when we anticipate storms to fire as the area of low pressure moves across the state. Should we get into any sort of sunshine later this afternoon (questionable at best), the opportunity for severe weather would increase during the 4p to 9p window (west to east). As it is, a couple of strong-to-severe storms can’t be ruled out given the dynamics in play. The biggest threat would be localized hail and/ or damaging wind gusts with these stronger cells.

Widespread 1″+ rainfall can be expected (both from this morning’s rain and what’s ahead this evening) with locally heavier amounts- especially south of the I-70 corridor.

Things will quieten down tonight and we still anticipate a much calmer Thanksgiving Day, itself, continuing through Black Friday and Saturday as high pressure settles overhead.

By this time, of course, attention will turn to the “shenanigans” ahead early next week. We have no changes to our thinking a significant event is ahead and continue to favor this initial storm tracking west of the spine of the Appalachians. Operational model will likely continue to offer up a wide range of solutions (sometimes with each model update). The item we’ll be most focused on is the phasing of the 2 streams. The timing of this taking place will play a critical role into who ends up with a sizable snow/ wind event vs. mostly rain with backlash snow. Stay tuned and know, as per usual, we’ll be posting away right through the holiday.

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VIDEO: Strong Storm Potential Tomorrow Afternoon; In-depth December Pattern Breakdown…

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VIDEO: Timing Out Multiple Storm Systems Between Now And Early December…

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VIDEO: Certainly Isn’t A Boring Pattern To Close November And Open December…

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Long Range Update: Closing Out Fall And Heading Into Meteorological Winter…

As we’re getting set to turn the page into a new season, modeling already agrees that the overall pattern is very much unlike the big “player” on the field (La Nina). While all Nina (as well as Nino and La Nada) events are different and unique, the “average” La Nina pattern is shown below:

Note both the EPS and GEFS for early December are polar opposite of this traditional La Nina look:

Before we look further at the various data, let’s review the latest teleconnection trends and MJO plots.

Teleconnections: In short, the consensus is it’ll be hard to drive any sort of sustained cold weather into early December. Note the AO is expected to run positive throughout the upcoming couple weeks, the EPO is mostly positive, as well. The one potential “fly in the ointment” that we’ll continue to keep a close eye on? The PNA and whether or not it continues to trend positive down the road.

MJO: This is much more problematic as the data disagrees on what takes place down the road. The European products stall things in the null phase (meaning we need to pay more attention to the teleconnection drivers) while the American data seems to want to take things towards Phase 6 by early Dec. This is interesting on multiple fronts. Obviously having to do with the battle between the models, but also whether the amplitude continues down the road. If (big If) the American model wins out, it could mean we swing things into the colder phases towards mid-December. Again, this is a very low confidence forecast and will require a close eye as we move ahead.

Model Data over the next couple of weeks:

CFSv2 Weeklies- warmth dominates over the next few weeks. Note the model sees the wet pattern in the immediate term before drying us out Week 2. Eventually, the wet pattern is shown to return during the Weeks 3-4 time period.

JMA Weeklies- Similar story to the CFSv2 Weeklies above. Warmth dominates, but what we’ll need to look for is the possibility of the model trending cooler “underneath” with time as the warmth builds over the top. While not an overly cold pattern by any means, should this take place, all of the sudden a rather “boring” pattern from a wintry perspective can flip and become more interesting. Note the precipitation pattern is also similar: wet now, drier Week 2, and a return of the more active times Weeks 3-4.

European Weeklies- Not much difference from the other weekly products with a warm look, overall. Similar to the JMA, we’ll need to watch if the warmth continues to build in Canada which would likely result in cooling across a portion of the Lower 48 (most likely Southeast region first) with future updates.

The overall consensus is it’ll be tough to get any sort of long-lasting well below normal airmass between now and Dec. 10. While it looks warmer than normal through the majority of the next couple of weeks, that’s not to say it’s a pattern without challenges, as pointed out above. (Heck, areas of northern IN may deal with wintry precipitation over the weekend). Of greatest interest, personally, is the PNA trend and watching the models “duke it out” with the MJO.

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