Category: GFS

Still Anticipate Late June Changes…

We asked this question on our Twitter account earlier this morning.  Do you prefer heat and humidity or frigid and snowy?  Here’s a look out the back door from the IndyWx.com HQ from this morning and then back to right after the early January winter storm.  Note the snow depth on the fence line.  Amazing stuff!

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Anyway…as we look ahead, we still anticipate an overall regime change as we progress through the upcoming weekend and into next week.

Model data remains in rather good agreement on the evolution of the upper air pattern over the course of the upcoming 7-10 day period.  The GFS is a touch more aggressive on the eastern trough when compared to the European, but both agree on week 2 cooling, as do we.

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This won’t be tremendously cool air (such as last weekend), but when compared to averages, we’re likely to cool things back to slightly below normal.

The PSD shows the changes, as well.  Note the current eastern ridge is replaced by the Day 10 eastern trough.

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The precipitation idea is one that is continued wet.  Our three primary mid range global models (GFS, Canadian, Euro) agree on widespread rainfall totals of 1.5″-3″ (locally heavier totals where stronger thunderstorms move) over the next 10 days.  Here’s a closer look at the Canadian, thanks to the model suite at Weatherbell Analytics.

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Permanent link to this article: https://indywx.com/still-anticipate-late-june-changes/

Thursday Morning Long Range Outlook…

Good morning!  We’ll have your full, updated, 7-day forecast posted here later this evening!  We wanted to discuss a few of the weather highlights as we move forward the next week, and beyond!

1.  A cold front will move through tonight and early Friday.  A shower or thunderstorm is possible as the front moves through, but won’t be a huge deal. Best rain/ storm chances appear to be across eastern portions of the region.

2.  Temperatures and humidity values will be at levels simply as pleasant as you can ask for this time of year Friday and Saturday.  Upper 60s to lower 70s during the afternoon and overnight lows in the upper 40s to lower 50s.  Hint of fall before true summer even begins?!  I’ll take it!

3.  Heat and humidity builds next week with ridging, but we continue to think this is a transient type pattern and seeds are already being planted for cooler times once past June 20th.  A couple days of 90 degree heat are possible mid to late next week.  Furthermore, with all of the moisture in the ground, humidity levels will be oppressive.  In other words, it turns hot and humid next week, but nothing too unusual for this time of year.  Like so many other times it’s tried to get hot this year, it seems as if the seeds for cooler are already being seen.

Lets examine some of the mid to long range model data.  We’ll start with a look at the 500 mb pattern off the GFS reforecast product from the Physical Science Division (PSD).  Note the riding that develops next week, but also note the trough and associated cooler pattern showing up just after the 20th.

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The GFS ensembles show the warmth (they still aren’t representing the warmth to the magnitude in which we’re going to see in my opinion, but you get the overall idea) next week and the coming cooler pattern around, and after, the 20th, relative to normal.

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The Canadian NAEFS product is next, outlining the temperature anomalies 6/20-6/27.  Note the warmer temperatures relative to normal (represented by the reds and orange hues) shifting off the east coast and the cooler temperatures (blue shades) developing and spreading east through the center of the country.

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Finally, let’s look at the CFSv2 weeks 3-4 product.  Again, we admit this model can be erratic at times, but we feel like it has a good handle on the coming pattern, as well, in this particular case.  The greens show the cooler than average pattern anticipated as we go through the back 7-10 days of June.

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As we close, it should also be noted that the overall active and wetter than normal pattern looks to continue as we put a wrap to the month of June.  We’re already off to a near-record pace for June rainfall across central Indiana and while we’ll have some dry days, the overall theme remains an active and wet one in the weeks ahead.

Much more with your full 7-day forecast later this evening!

Permanent link to this article: https://indywx.com/thursday-morning-weather-rambles-2/

Tuesday Evening Video Update!

Good evening and thank you for logging onto IndyWx.com!  Tonight’s video covers the unsettled time of things tonight into Wednesday morning as low pressure continues to have a hold on our area’s weather.  Also, we talk long range weather and give you an idea of what you can expect for the rest of the month of June, temperature-wise!  While we didn’t get into the precipitation side of things in tonight’s video for late month, I will say it continues to look very unsettled with above average rainfall anticipated to wrap up the month of June.  Anywhere from an additional 3-5″ of rain is possible as we go through the rest of the month here across central Indiana.

While the CFSv2 can be a bit erratic at times, we feel the model has a good handle on the way the overall pattern will evolve late June into July.

While the CFSv2 can be a bit erratic at times, we feel the model has a good handle on the way the overall pattern will evolve late June into July.

Permanent link to this article: https://indywx.com/tuesday-evening-video-update/

Unsettled Stretch Ahead…

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Showers and thunderstorms will rumble into central Indiana during the overnight hours.  While some short term forecast models suggest some hefty rainfall totals, we think what’s more than likely to happen is that most neighborhoods see around one half inch late tonight into the wee morning hours Sunday.  There will be some locally heavier totals reported closer to 1″, but that will be the exception to the rule!  The local air mass is just so dry (as of this evening dew points are still in the lower 50s across central Indiana) and while moisture will increase through the night, it’ll likely be too little too late.  Regardless, don’t be surprised if a rumble of thunder wakes you during the overnight. Some early showers are possible Sunday, otherwise the theme will be a drier one through the day.  While some of our short-term forecast models suggest showers are around Monday, we’re siding more with the GFS and European models and providing a dry start to the work week (we’ll continue to monitor and update if needed Sunday).

The rest of the work week will feature a busy time of things in the good ole forecast office as we track multiple disturbances.  Each one of these will be capable of producing heavy rain and embedded thunderstorms.  As of now, we’re forecasting heavier rain Tuesday and Friday, but we’ll fine tune the timing as we move forward.

Finally, as we move into next weekend, there are considerable model difference between the GFS and European forecast model.  For now, we’re splitting it down the middle and going with dry skies along with comfortable temperatures Saturday.  Model numbers vary from the upper 40s (GFS) to middle 50s (EC) for overnight lows and lower 70s (GFS) to middle 80s (EC).

More later, friends!  Have a relaxing evening!

Permanent link to this article: https://indywx.com/unsettled-stretch-ahead/

Wednesday Evening Video Update; Drier, Cooler Air Coming!

Good evening, friends.  Here’s a video update as we get set to welcome a cooler, drier regime into central Indiana to wrap up the work week.  Additionally, we’re also tracking another potential heavy rain maker for the second half of the weekend (not that we need more heavy rain)….

PS: The IndyWx.com mascots have attempted more times than not to interrupt my video updates, so I only thought it was time to give them a little face time.  Meet Cameron (left) and Newton (right).

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Permanent link to this article: https://indywx.com/wednesday-evening-video-update-drier-cooler-air-coming/