By Barry Burbank, Meteorologist, WBZ-TVBy Barry Burbank

BOSTON (CBS) – The forecast for the Boston Marathon seemed clear-cut Monday but I am not quite as highly confident of the specifics right now.

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The main reason is blamed on a changing setup from a cell of high pressure over the region to the approach of a warm frontal boundary instead. Not to worry because it will NOT blossom into a stormy scenario.

The only thing that could happen is the appearance of some cloudiness and a brief shower with the boundary and warmer air than expected Monday.

Assuming the warm front passes, there would be a robust warmup from the early morning lower to middle 40’s into the 60’s to perhaps 70 or so in the afternoon.

Thankfully, there will be NO repeat of last year’s 87 degrees!

With this happening, there would be a shift in the wind from the direction of southeast into the southwest which would be more of a tail wind in many places and a cross wind component from right to left in other locations. The speed would freshen up to 12-25 mph.

Leading up to the Boston Marathon, after rainy conditions Friday and Friday night, Saturday and Sunday will dry out and become partly sunny.

There is a low risk of a shower on both weekend days with highs in the middle to upper 50’s.

Monday Morning In Hopkinton:

Varying amounts of clouds, a light south-southeasterly breeze, temperatures starting out in the upper 30s to lower 40s at 7 a.m. then up to near 50 by race time.

Daytime Along The Course:

Varying amounts of clouds with a slight risk of a sprinkle or shower, breeze picking up from the south at 8-18 mph, warming through the 50s to near 60 by midday then perhaps up to 65-70 by mid-afternoon.

Finish Line In Boston:

Partly sunny, a gusty southwesterly wind of 12-25 mph with temperatures of 67-70.

Follow Barry on Twitter @BarryWBZ

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