Category Archives: Monthly Outlook

Finalized April Outlook…

Averages for April are as follows:

*High: 63.4

*Low: 42.7

*Rainfall: 3.81″

*Snowfall: 0.2″

By the time all is said and done, this is how we see April shaping up:

Modeling continues to show April opening cooler than normal and we agree that this will be the case, including a wetter than normal pattern, as well.

With that said, the persistent AK ridge begins to break down by the 2nd week of the month. This will lead to the early month chill being transient in nature and a significant flip to warmer than normal conditions during said timeframe, as well.

Note by the middle part of the month, a ridge is now forecast to be in the exact position the ‘mean’ trough position will locate itself for early month.

To no shock, it’s a vastly different temperature profile, as well. Now above normal warmth dominates. It’s easy to argue the model may not be warm ‘enough’ by this time over the OV and Northeast, with cooler anomalies across the SW.

The active pattern to open the month is expected to “settle down” for mid and late month as an upper level ridge dominates.

While the first week of April will likely run cooler and wetter than average, a rather significant flip in the pattern will result in drastically improved weather around these parts by mid and late April. By the time we get to month’s end, we think drier than normal conditions will rule across the northern Plains with warmer than average weather taking up shop across the Ohio Valley. A corridor of wetter than normal conditions is expected across the Intermountain West into the Lower MS River Valley.

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More On The Late March-Early April Pattern And Reviewing The NEW JMA Weeklies…

As we look ahead, a persistent western Canada/ Alaska ridge continues to show up on the medium to long range data. The downstream implications are for cooler than normal temperatures, overall, across the eastern and central portions of the country into early April.

Upper air pattern- Days 4-9
Surface temperature anomalies- Days 4-9
Upper air pattern- Days 9-14
Surface temperature anomalies- Days 9-14

Given the time of the year (and pattern), cool won’t rule the entire period. It’s just that the cold will “out do” the transient warmth in between storm systems over the next couple of weeks.

When we look at the teleconnections (combo of negative EPO and neutral to slightly positive PNA is ruling the day for now), they support the lingering chill into early-April.

However, as we turn the page from early-April to mid-April, the idea here is that an eastern ridge will begin to expand west with more “umph” and eventually lead to warmth overwhelming the pattern. We aren’t budging from the original idea of a warmer than normal April by month’s end. It sure appears as if the NEW JMA Weeklies are catching onto this idea.

Weeks 3-4 (mid April) forecast upper air pattern.

From a precipitation perspective, the majority of medium and long range model data does show a return of wetter times (relative to normal) as we move into April, including an active storm track. The beginning of this overall shift in the pattern back towards wetter than normal conditions will begin early next week.

We’ll recap our latest short-term thinking, including an update on the NEW European Weeklies that will arrive this evening later tonight in a video update.

In the meantime, make it a fantastic Thursday- and happy tip off to March Madness!

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Long Range Update And Summer Preview…

One more unseasonably chilly spell awaits late-March (behind our mid-March spring “tease”), but we continue to believe an unseasonably warm stretch of weather gets going by the last few days of the month- continuing into April. Furthermore, meteorological spring overall continues to look warm, relative to average, for central Indiana. In the event you missed our Spring Outlook earlier, it can be found here.

However, what follows the late-March set-back is a more significant and sustained push of unseasonably warm conditions.

Note the positive PNA that will help drive the chilly pattern next week returns to neutral as we put a wrap on the month:

To no surprise, modeling is painting a vastly different look as we close March and open April.

We turn cooler next week with the positive PNA in control, but this won’t last…

Note the significant change aloft (and at the surface) as we close the month and get set to head into April…

Longer term, modeling continues to give us an actual spring this year. We continue to expect average to slightly above average temperatures in April, complete with slightly above normal precipitation (with a “ramp up” in severe chances, locally).

Modeling is following suit with that idea:

It should also be noted that while not shown, the new European Weeklies in this evening also support the warmer than normal April idea.

As we look forward, we continue to research and build our summer outlook. Early indications would suggest that we transition out of an overall warmer than average spring towards a seasonal, to slightly below average, time of things this summer, complete with above normal precipitation. We, obviously, still have some time to go before the final product is ready to be published, but stay tuned. We are planning to launch our official summer outlook in early May.

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Running the Gamut; Looking Ahead to April…

We’ll apologize in advance for the long-winded post tonight, but there’s a lot to cover. Not only do we have the accumulating snow on deck, a couple of strong storm systems this weekend into the middle of next week, but the long range pattern is set to turn cold (again) after a mid-month respite. We also want to look ahead to our early thoughts towards April…

Let’s take things one at a time:

Thursday-Friday Snow

While we don’t have major changes to our ongoing snowfall forecast, we have “sagged” the swath of 1″ to 3″ snow south just a hair given the latest computer model guidance. Steadiest snow should fall Thursday night into the predawn hours Friday. We’d anticipate a slick Friday morning commute through the heart of central Indiana.

Snow should exit off to the southeast around, or just before, lunchtime Friday. As always, your ground-truth reports are welcome (feel free to send to us on Twitter or via e-mail).

Warmer Side Of Things

The ‘mean’ trough position will shift to the west (temporarily) and lead to an overall milder time of things for the mid-month stretch. Unfortunately, the milder air will come with a wetter pattern.

This milder, wetter pattern will be highlighted by (2) storms:

I. Saturday, 3/10

II. Tuesday-Wednesday, 3/12-3/13

Both storm systems will be capable of producing locally heavy downpours and embedded thunder. Greatest chances of severe will remain south of central IN with this weekend’s storm, but may be further north next week. We’ll keep a close eye on things and issue Client Briefs if need be as we get closer.

A combination of the GFS and European computer models print-out rainfall totals between 1″ and 2″ over the upcoming 10-days and this seems reasonable given the fact both storm systems will be able to tap into Gulf of Mexico moisture.

From a temperature perspective, the brutal cold will come to an end behind our late week snowmaker. While “transient” chill will follow both of the upcoming storm systems, we’re heading into a much milder pattern, overall, through the mid-March stretch. Mildest air will come directly in front of the storm systems, highlighted by a couple of 60 deg. + days the middle of next week.

Positive PNA takes over

Unfortunately (for lovers of spring), the mid-month warm-up will be only a “tease” as we’re set to trend cooler, relative to normal, for the last 10 days of the month. The reason? A developing positive PNA.

To no surprise, we see the cooler pattern returning on the computer models:

Not only will we turn colder to close the month, but Thursday likely won’t be our last accumulating snow of the season…

Looking Towards April

Despite the late-March “set back” to a chilly time of things, we continue to think a more sustained “stick and hold” spring pattern looms around the corner. In fact, we agree with the latest CFSv2 delivering a warmer than normal pattern for April, as a whole, to the eastern portion of the country.

Note that as we go, the model is getting warmer for April with each passing day. As things stand now, we think the trough will pull back to the west with a more sustained ridge in place across the eastern portion of the country in April. With this, a wetter than average regime likely awaits, including an uptick in severe chances further north into the region.

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