Jun 23, 2015 1:02 AM

NH1 Weather Insider: A Stormy Tuesday

NH1 Chief Meteorologist - NH1.com

Incredible views of the Northern Lights last night thanks to a strong geomagnetic storm high in the atmosphere. The strength of the storm helped to push it down all the way to Cape Cod. It is critical to get away from light pollution for you best viewing. As skies clear tonight, you may have another chance for viewing in case you missed.

Tuesday will be a very active weather day across New England. The Severe Storms Prediction Center has us in an enhanced risk for severe thunderstorms. It will likely be our most active thunderstorm day of the year so far. A warm front will push through during the morning. This will come with scattered showers and a few thunderstorms...especially across the north country. A few cells here may hold together enough to trigger a few isolated severe storms around 11:30-2 PM. We'll see. As the warm front lifts northward during the afternoon, a warmer more humid airmass will be directed into New England with temps back into the 80's and dewpoints in the 60's. It will be critical to watch the satellite around lunchtime Tuesday, if clouds hold tight, the clouds will help to cool, stabilize the atmosphere with just a few scattered showers in the afternoon. But if the clouds break, and we punch into the sunshine...we will be off to the races!

The high heat and humidity will help to fuel the development of afternoon thunderstorms as the the heat will break through the cap and air will rise into the level of free convection, which is extremely unstable air warm air rises through to help to building towering cumulonimbus clouds which can start rotating and form severe thunderstorms. Wind shear will be strong over our heads during the afternoon which will aid in tilting the t'storms and aiding updrafts and hail development. Also winds will be turning with height, so rotating t'storms with the possibility of a tornado can not be ruled out...if all the ingredients come together. Again, the amount of sunshine will be critical in how strong these storms become in the afternoon.

I think the best window for afternoon storms will be between 2-6 PM in New Hampshire. Meanwhile in Southern New England, Severe weather could become quite a problem across that part of New England from 4-8 PM with a good potential for microburst damaging winds, and again the risk for a tornado. We will be watching very closely Tuesday and keeping you up to date.

The cold front pushes off the coast later Tuesday with clearing skies by evening and drier, less humid air returning for the midweek. Wednesday and Thursday look very nice with sunny to partly sunny skies in the 70's near 80. A few waves of low pressure will be tracking south of New England Friday through the weekend into next week. Most to the rain should stay south of us, but it will be possible for a few showers to track north of us and clip us for a time this weekend, maybe Sunday morning? With lows tracking south of New England, we are promised to have cool onshore winds which will keep it much cooler at the coastline through the weekend into the start of next week.


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