Apr 16, 2015 8:18 PM
NH1 Weather Insider with Joe Joyce: April 17, 2015
NH1 Chief Meteorologist- NH1
A weak front is crossing New England Friday morning. Expect some passing showers during the morning hours between 5 AM-9 AM. They will be fairly light, but it will be enough to keep the roads wet for the AM commute and have the windshield wipers on. This batch of energy will push off the coast, so by the midday clouds will begin to break. In fact, skies will be increasing with sunshine during the afternoon hours. With a west wind following behind the front, temperatures will be able to climb right back up into the mid 60's for most across New Hampshire.
The weekend will get off to a nice, mild start with sun-filled skies for your Saturday morning activities. Highs will again be in the 60's. We will have to watch a low tracking out of Canada with a cold front. This is a push of cooler air which will collide into the mild air across New England. Clouds will increase during the lunch hour with the chance of a brief afternoon shower as this front pushes through.
Cooler air will be on the move Saturday night into Sunday with a windshift to the NW. High pressure will slide down over us providing sunny skies for Sunday, but cooler temperatures near 60-62 degrees. This will mark the beginning of a cooler pattern which will be in place for most of next week. As we talked about yesterday, a deep upper level low will be tracking up through the Great Lakes next week and directing a strong front with a heavy batch of rain into the Northeast. That forecast still stands.
The big question for Monday's weather is how will this next chance of rain effect the Marathon? The timing is always uncertain this far out and will and likely change as we get close to the event. High pressure off the coast will give us a dry start on Monday, but how long that dry air can hold is what is in question. A slug of rain will approach New England and could hold off into the afternoon if we are lucky. But once the rain arrives, it will be steady along with breezy cool and raw SE winds! About 1" of rain could fall which could lead to a little minor street flooding in spots or even some minor stream flooding as rivers are starting to run a bit higher.
Another question is how quickly does the rain end on Tuesday. Showers could linger in the morning, or be quickly pulling off the coast by dawn. We will be watching. As this low lifts away, a seasonal cooler airmass will remain in place with drier conditions in place for the midweek. We will have to watch for other spokes of energy rotating around the upper Low across the Great Lakes which could also always trigger a few more showers.