Category: Forecast Discussion

January Thaw Takes Hold…

January is running more than 11.5° below average and more than 50% of the country is currently covered in snow.

However, big changes begin to take place this weekend and will remain intact for the majority of the next couple weeks.  The mean trough position will back into the west while ridging takes hold across the east.  This will feature temperatures that will push to above average values and lead to an active and moist southwesterly flow.

Over the upcoming (10) days, temperatures may reach 50°, or greater, on 3 to 4 of those days.  Compared to how frigid we’ve been (already had 7 mornings this month with sub-zero lows), this will feel like a heat wave.

We’ll leave you with a heads up to enjoy the January thaw (yes, even if you’re one of those winter lovers out there) as the pattern sure looks like it’ll deliver a return to bitterly cold, wintry times as we head into February…  In fact, analogs would suggest once winter returns, it’s likely to remain in place deep into spring this year.

Permanent link to this article: https://indywx.com/2018/01/19/january-thaw-takes-hold/

VIDEO: Frigid Times “Moderate;” Looking Ahead…

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Permanent link to this article: https://indywx.com/2018/01/17/video-frigid-times-moderate-looking-ahead/

Frigid Air Relaxes; What Awaits?

2018 has opened on an absolutely frigid note.  Indianapolis is running an amazing 11° below average through mid-month.

Eight mornings so far this winter have plunged below zero.  We’ll see if we can add another to that list this morning (IND is officially at 0° as we write this).

52% of the country is covered in snow.  In fact, my old stomping grounds of Auburn, AL received 3″ of the white stuff overnight!

If you’re sick and tired of the cold, wintry conditions relief is on the way.  We’ll turn “less cold” through late-week and above normal over the weekend (around 40° Saturday and into the upper 40s Sunday).

A storm system will cut into the ridge Sunday with showers (image 1) followed by “backlash” snow showers and gusty winds Monday (image 2).

Thereafter, models see another storm that will approach the region late next week.  Since cold air won’t be readily available, it’ll take the perfect track to get impactful wintry conditions from this next event.  We’ll monitor things closely next week.  With this near Day 10, models will continue to struggle with timing, track, and intensity over the next few days.

As a whole, the second half of January should run milder than average.  However, as we all know, that doesn’t mean we won’t have wintry challenges to deal with.  The upcoming (10) days illustrates that nicely.  Looking ahead, we note the MJO is forecast to rumble through the warmer phases (especially if you’re reading this from the eastern regions of the country- where we expect warmth to be most anomalous into early February).

Other teleconnections also support a relaxation of the cold, and warmer times, overall, with the exception of the Arctic Oscillation which remains negative through the period.

It should be noted that the longer range data and overall trends, supported by our analogs, suggest winter roars back with authority as we get into February.  In fact, winter might not be so quick to leave this year either.  Data paints a cold, wintry open to meteorological spring this year, but we’re getting way ahead of ourselves.  It is only mid-January, after all.  🙂

Permanent link to this article: https://indywx.com/2018/01/17/frigid-air-relaxes-what-awaits/

VIDEO: Moderate To Heavy Snow Moves In Monday Morning…

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Permanent link to this article: https://indywx.com/2018/01/14/video-moderate-to-heavy-snow-moves-in-monday-morning/

Another “Plowable” Snow Gives Way To Sub-Zero Cold…

With the exception of light lake effect snow showers today (noticing a couple of light bands just west of the city as we write this Saturday morning around 10a), most of today and Sunday will be dry and cold.  We’ll top out around 20° today and Sunday with low temperatures tonight dropping into the 0° to 5° range.

Our next snow maker will arrive late Sunday night into Monday morning in the form of a clipper system.

Forecast radar 1a Monday.

We expect light snow Monday morning to grow in overall coverage and intensity through the late morning and into the early afternoon hours.

Forecast radar 10a Monday.

Accumulating snow will push off to the south Monday evening.

Forecast radar 7p Monday.

This will be a plowable event for central Indiana and we’ll also have to deal with blowing and drifting concerns Monday afternoon through Monday night as strong and gusty northwest winds arrive.  Needless to say, to our snow removal and DPW crews out there, find a way to get some rest this afternoon and Sunday before another busy stretch to open the work week.  We think additional snowfall of 2″ to 4″ is a good bet across the northern half of the state, with slightly lighter amounts of 1″ to 2″ across southern Indiana.

Arctic high pressure will settle over a growing snowpack to help setup a frigid stretch through early and mid week.  Multiple nights with below zero readings are expected beginning Tuesday morning where most will wake up to readings of 3° to 8° below zero (not counting the wind chill).

Permanent link to this article: https://indywx.com/2018/01/13/another-plowable-snow-gives-way-to-sub-zero-cold/

VIDEO: Two Winter Events Impact Central Indiana Between Friday And Monday…

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Permanent link to this article: https://indywx.com/2018/01/11/video-two-winter-events-impact-central-indiana-between-friday-and-monday/

VIDEO: Brief Thaw Gives Way To A Wintry Close To The Week…

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Permanent link to this article: https://indywx.com/2018/01/10/video-brief-thaw-gives-way-to-a-wintry-close-to-the-week/

Confidence Growing In Potential Major Winter Storm…

Confidence continues to grow in the prospects of a major winter storm impacting the Mid West and Ohio Valley Friday into Saturday.  A cold front will slip through central Indiana Thursday night, allowing colder air to push back into the state.  At the same time, surface low pressure should begin to organize along the tail end of the frontal boundary across the Ark-la-tex region.  As we progress through the day Friday, cold air will continue to penetrate south into the Ohio Valley while the surface low lifts northeast into the region.  While we can argue about the specific track (this is still a few days out, after all), the pattern supports a central Ohio Valley track as we progress through the day Friday into Saturday.

EPS 500mb ensemble mean Friday

EPS 500mb ensemble mean Saturday

EPS 500mb ensemble mean Sunday

We caution not to get too worked up over individual operational output (including those “spectacular” runs) as run-to-run variance is likely over the next few days.  That said, when we have support from overall pattern techniques that have supported a significant interior event for late this week since last week, along with ensemble agreement, it does lead to greater than normal confidence.  If you have travel plans late this week/ weekend, we suggest keeping a very close eye on the forecast.  This will be a high impact event for portions of the Ohio Valley.

While it’s impossible to say precisely where the heaviest swath of snow is laid down in this situation from a few days out, this is a storm that should carry a swath of 6″ to 12″+ snow just to the northwest of the track.  Additionally, an initial period of an icy mixture of sleet and freezing rain is also possible.  Finally, as the storm wraps up over the Ohio Valley Saturday, a strengthening wind will lead to potential severe blowing and drifting issues.  Fresh arctic air will flow into the region Saturday night into Sunday that will return sub-zero wind chills to the area.

Bottom line, stay tuned…

Permanent link to this article: https://indywx.com/2018/01/08/confidence-growing-in-potential-major-winter-storm/

VIDEO: Wintry Mess By Sunday Night; Don’t Put Us In The Winter’s Over Camp…

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Permanent link to this article: https://indywx.com/2018/01/05/video-wintry-mess-by-sunday-night-dont-put-us-in-the-winters-over-camp/

Friday Morning Rambles…

I. Bitter Cold: We’re adding another morning below zero to an already impressive (and growing) list of frigid lows this winter.  Take a look at these morning lows in the…

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Permanent link to this article: https://indywx.com/2018/01/05/friday-morning-rambles-4/

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