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Apr 22, 2015 8:31 PM

NH1 Weather Insider with Joe Joyce: April 23, 2015

NH1 Chief Meteorologist - NH1.com

Our mild stretch of weather is finally coming to an end. 7 of the past 11 days we have seen mild temperatures in the 60's it has been very welcome warmth in an otherwise cold pattern which dates back to January! The cold is back for now! Luckily, it is only April cold instead of mid-winter Arctic air. A huge upper level low is drifting towards Northern New England. It will generally remain stationary over us through the weekend into early next week because of a blocking pattern which currently is in place across the North Atlantic. The upper low comes with a cool pool of air aloft which creates instability. The late April sun heats the ground and that warm air will continue to rise through the cold air until it quickly condensates and forms clouds. The upper low will help to generate these instability showers on and off during the peak heating of the days from now into next week. With breezy downsloping NW winds, expect mostly dry conditions across southern New Hampshire and towards the seacoast. The most likely area to see any showers or snow showers will be in the hills and mountains, where NW winds will be upsloping up the mountains which will trigger scattered precipitation. We call this "Orographic lifting". Temperatures will be cold enough to support snow showers in the mountains Thursday night and Friday morning. The downsloping wind off the mountains will have a drying effect and produce periods of sunshine, especially during the morning hours when the sun's energy is not as strong. Winds will be gusty sometimes from the NW with gusts over 20 mph. Temperatures will remain seasonally cool through the weekend. Normal highs this time of year are around 60. Our highs on Thursday and Friday will be in the 40's and Lwr 50's, mid 50's for the weekend. In the longer term, the upper low will begin to back westward toward us next Monday and Tuesday. This will likely spin back more clouds with an increased risk of showers, and cooler temperatures. The blocking pattern should finally begin to break down farther into next week, with our next warm up having to wait for May! Bring it on!


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