Apr 4, 2016 11:54 PM
NH1 Weather Insider with Joe Joyce: Sunshine returns to NH, cold remains
NH1 Chief Meteorologist
What a cold start to the day despite the Calendar saying April 5th! Yesterday's 1-4" snowfall is adding to the chill this morning with temperatures starting off in the teens and Lwr 20's. A Hard freeze overnight is making for slippery side roads, and sidewalks early this morning on untreated cold surfaces. It is an icy start in spots so please use caution. The good news for those who do not want to see any more snow, We will have a full April sun shining down upon Monday's snow. Highs will be climbing into the 30's by the afternoon and snow will begin to melt away. As quickly as a Spring snow comes, it can just as quickly disappear! The clear skies will continue into Tuesday night as high pressure will crest over us and slide south of New England. Tuesday night will be another cold one with lows in the teens with the clear, cold calm conditions.
Temperatures will start to moderate a bit by Wednesday with high pressure centered south of New England. Sunshine will fade to increasing afternoon clouds with a somewhat milder west wind. Clouds will be streaming into the Northeast in advance a batch of moisture which will be directed into the North east for Thursday. A deep trough will dig into the Great Lakes Thursday. This will direct a milder southerly flow up the east coast. As a low tracks west of New England, Showers will develop Thursday which will turn into a heavier rain, with downpours and an embedded thunderstorm Thursday afternoon. Gusty SSE winds will come with the rain with highs climbing back into the 50's. The rain will likely last into Thursday night before pulling away by dawn on Friday. There is the potential for up to 1" of rain and some street flooding in the heavy rain.
The trough will remain over the Northeast to end the week. Enough mild air left over from Thursday's push will give way to a seasonal Friday in the Lwr 50's with a mix of clouds and sun behind the departing rain. But cooler air from Canada will be spilling into the trough. An upper low with it's cool pool of air aloft will track over us Saturday. Temps will fall back into the 40's with any sun giving way to building clouds and the risk for a few hit or miss scattered rain or snow showers. As the upper low shifts farther off the coast Sunday, it will continue to direct a cold NW flow from Canada into New England with highs only in the 30's and Lwr 40's Sunday with mostly dry conditions.
After a fairly tranquil weather pattern for most of the winter dominated by a Pacific flow thanks to the Super El nino, only now here in April do we finally move into a "Blocking pattern" which is more conducive for storm development. If we had this pattern in winter, we would be moving into a very snowy pattern. That will not be the case here in April, but this atmospheric blocking will make for frequent troughs, frequent cooler shots of air, and frequent shots of precipitation which could help to make April average slightly below normal which would be the first time we have had a month cooler than average since last June!