Jul 21, 2015 12:47 AM

NH1 Weather Insider: Tuesday July 21, 2015

NH1 Chief Meteorologist

If today reaches 90 degrees in Concord, NH...It will officially be a heat wave. After reaching 92 both Sunday and Monday, stringing together 3 consecutive 90 degree days will make it officially our first heat wave of the summer. We have a good shot at it! Tuesday will start off with temps in the 60's, but by noon time we will be well into with highs climbing into the upper 80's and Lwr 90's by afternoon. A mix of sun and clouds can be expected with SW winds directing the muggy air right into New England with dewpoints in the 60's. A cold front will begin to slide into the region by the later afternoon and evening. This will mark the leading edge of cooler and less humid air which will return for the middle to end of the week. This cold front will likely trigger a few scattered showers and thunderstorms for the early evening hours between 5 PM and 9PM as it crosses the state. The threat for severe weather does not look as impressive as it did for Sunday, so damaging winds, large hail should not be expected. But a few of the storms will come with some briefly heavy rain as they pass through and some lightning.

Dry, less humid NW winds will follow in behind this front for the midweek. Highs on Wednesday will be in the upper 70's and lwr 80's with sunny to partly sunny skies. A trough will become established across the Northeast with an upper low sitting over Hudson Bay in Canada. This cool pool of air aloft will provide some instability as warmer air will rise into the cooler air for cumulus clouds to develop during the peak heating hours of the day. Clouds will build in the mountains with maybe a few isolated showers. This upper low will also steer in a few pieces of energy to help enable cloud development and the necessary lift for the periodic shower. While most of the middle to end of the week will be dry, there is the potential for a few showers or a t'storm to form on Friday with a weak cold front.

High pressure will return on Saturday with winds shifting onshore for a cooler flow at the beaches. Another weak front will approach on Sunday coming with more clouds and the risk of a few more showers in the afternoon. It does not look like a picture perfect weekend, but it is still early and there will be plenty of little disturbances to track in the upper flow. Temperatures will mostly be falling back into the 70's for a while, so all of you who are not fans of the summer warmth....a more refreshing break from the intense sun and heat is on the way!


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