December 7, 2015 archive

Patience Required…

Ironically, the only area of normal to below normal air (with the exception of the Rockies and southern Plains) is located over our region, month-to-date.

ncep_cfsr_noram_t2m_anomFrom a winter lover’s perspective, this December has been one to forget this far, and it’ll only grow more frustrating in the days ahead (we still forecast mid to upper 60s over the weekend).

The basic drivers of our pattern remain generally unchanged from ideas in October when we posted our Winter Outlook.  Our complete Winter Outlook can be found here.  We feel the need to remind some that we thought we would get off to warmer than normal and relatively quiet start:

  • “We feel this model best represents the likely milder than average start to winter before colder conditions mid and late winter.”
  • “We think the winter opens warmer than normal and relatively dry before shifting towards a colder than average pattern for mid and late winter.”
  • “The word “volatile” comes to mind at times.”

In short, there’s nothing out there that would suggest any reasons we should deviate from our current winter outlook that’s out there.  Despite the warm start, we still feel the winter, when all totaled up, will end up slightly colder than normal.  Additionally, though still falling short of normal snowfall, we also feel there will be plenty of winter weather potential come mid and late winter.

That leads us to the shorter term and what happens after the near record warmth of the upcoming weekend.

To sum it up:

  • A very active pattern develops this weekend with storms to track every 3-4 days.
  • Despite a storm or two that may have a favorable storm track for winter potential, it’s important to note sufficient cold air is tough to come by in the more immediate term.
  • Last week’s crashing SOI (Southern Oscillation Index) will lead to poor run-to-run consistency.
  • We do see a way the pattern could get cold enough for more interesting times the closer we get to Christmas.  Does this mean we’re guaranteeing a snow storm?  No, but, as mentioned this morning, the teleconnections will at least make an attempt to transition closer towards a state that could offer up wintry mischief at some point during the last (10) days of the month.

Bottom line is that the overall pattern is one that favors more in the way of warmer than average conditions through the next couple weeks before we begin transitioning towards more sustained wintry conditions mid and late winter.  The idea here is that with each successive storm that comes through, it’ll cut into the mean ridge position and the heights will continue to lift further and further north with time over the upcoming 10-14 days.  The GFS ensembles show this.

RidgepositionIs it an ideal set up for “lock and load” winter?  Not at all.  Is it an improvement that can at least offer up a couple attempts of wintry potential around Christmas?  Yes.

As stated above, in the longer term, based off current data and seasonal modeling, there’s no reason to walk away from the idea the slow start to winter continues for the duration.  Patience friends. 🙂

Permanent link to this article: https://indywx.com/2015/12/07/patience-required/

What Season Is This? Active Pattern Develops…

Screen Shot 2015-12-07 at 7.31.39 AMHighlights:

  • AM fog gives way to sunshine
  • Another fast moving disturbance moves through Tuesday night-Wednesday
  • Major warmth
  • Stormy finish

A quick glance at the updated 7-day shows two things, a lack of cold air and a rather active time of things.  In the near term, it remains a relatively quiet period.  We’ll deal with morning fog in spots this morning (especially north-central IN) and another fast moving disturbance in the Tuesday night-Wednesday time frame.

The big story as we move into the back half of the week is the unseasonably warm regime that will have many asking “What season are we in?”  We’ll aim for the upper 50s Thursday, around 60 Friday, and upper 60s Saturday as a strong SW flow develops in advance of our next storm system

Warmth will reach it's peak Saturday. Source: Weatherbell

Warmth will reach it’s peak Saturday. Source: Weatherbell

While a scattered, fast moving, shower is possible Saturday, the big story will be the warmth and a gusty SW breeze.

Our storm system will grow closer Sunday and we’ll ramp up rain and storm chances accordingly during that period.  Our two most trusted global models handle things differently as we progress into the Sunday-Monday time frame (strength, track, and timing), and we’ll need to continue to fine tune that particular period as we move forward.  As it stands now we’ll forecast rain and thunderstorms to become widespread Sunday before colder air arrives on the backside of the storm. Stay tuned.

SundayMap

MondayMap

Permanent link to this article: https://indywx.com/2015/12/07/what-season-is-this-active-pattern-develops/

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