May 24, 2016 1:42 AM
NH1 Weather Insider with Joe Joyce: May 24, 2016
NH1 Chief Meteorologist
With a weakening low south of New England, and a large upper low just over our heads, we can bet on plenty of clouds and cooler temperatures for Tuesday. Onshore winds will keep the clouds around...especially near the coast...but the highest chances of of light rain and or showers will shift inland over the course of the day. A few convective cells are possible with a slight risk of thunder as well..
We should see at least a few sunny breaks in the afternoon across the Connecticut valley and northern New Hampshire and with a fair amount of instability...we should see showers and thunderstorms developing in these areas. Marine layer will hold temperatures in southern New Hampshire and southern Maine in the 60s. Northern zones and the Connecticut valley will reach the lower to mid 70s. Highs will be in the 50's at the coast. Low pressure will dissipate over the Gulf Maine Tuesday night. After a chance of evening showers looking for partial clearing overnight. Lows will be fairly uniform across the forecast area dipping into the upper 40s to lower 50s.
A short wave trough will be overhead at the beginning of the period Wednesday with a cold front arriving by the end of the day across the north country. This could trigger widespread showers as the front moves north to south...beginning in the afternoon and lasting through the evening. The best chance of late afternoon Thunderstorms are expected across the north country. Westerly down sloping winds will help temperatures warm into the 80s both Wednesday and Thursday. Thursday will be the odd precipitation free day of the week although a warm front will remain stalled over the region.
Friday and Saturday northern New England will be in a near zonal, flat flow as short waves to our north slowly flatten help to our ridge. A front will remain stalled right over New Hampshire, separating the warm summer air from cooler air in Maine and off the water. This front will help to trigger periodic convection in the form of showers or a thunderstorm.
By Sunday, we begin to see more troughing appear aloft as the ridging is suppressed. At the surface Friday onshore flow and Canadian high pressure builds in from the NE bringing temperatures down several degrees as this back door front will play having with temperatures at the surface. Any onshore wind will make it much cooler at the coast. This stalled front is going nowhere this weekend keeping lower level winds onshore through the first part of the holiday weekend and periodic showers in the area. Temperatures will remain fairly warm across the interior this weekend, but there will be a push of cooler air with winds from the Northeast and high pressure off shower.
This will make Monday much cooler with 50's at the coast, and some 60's inland. Monday is looking mainly dry with the high pressure parked off the coast