Jul 27, 2016 11:29 PM
NH1 First Alert Weather: The heat breaks in NH with chances of rain
NH1 Chief Meteorologist - NH1.com
Can you take it anymore? We have to make it through one more day! Today will mark our 7th day of Heat near 90 degrees or higher. Today will definitely be hot and humid Highs will be climbing to near 90-95 with dewpoints in the 60's. Further north in the mountains temperatures will be cooler ranging from the upper 70s to lower 80s due to the developing cloud cover and scattered storms. Hazy sunshine will fade to increasing afternoon clouds. Scattered showers and thunderstorms will develop first over northern and western areas of Maine and New Hampshire and then will gradually spread southward to the coastline by early. There will be the potential for a few heavy downpours and the risk for some isolated severe storms to pop up with a passage of a cold front through New Hampshire by sunset.
By Thursday night, the front will stall near the coast and across southern new England. A few showers and and a thunderstorm continuing along and north of the front. The best chance for any thunderstorms will be primarily late afternoon and early evening. Not expecting much of a severe threat due to poor dynamics with the system. Another warm muggy night is also expected Thursday night due to the lack of any ventilation of cooler or drier air.
On Friday, we will be dealing with a shortwave trough lifting out of the Tennessee Valley and towards the southern New England coast. There is good confidence of a coastal low pressure developing and moving very close to the elbow of Cape Cod. There will be a strip of heavy rain which will be directed into Southern New England Friday which will have the rain dancers dancing for joy for the good soaking. There will be a heavy rainfall potential due to the moisture rich air this rain will be coming from, colliding into the drier air being directed in from Canada from High pressure to our North. On the NW side of the low pressure model guidance has a strong frontal signal...especially for this time of year. With warm cloud depths on the order of 12,000 feet or more...rainfall could be quite efficient in places, with the potential for 1-2+" of rain in southern New England.
At this time the best potential will be over Southern zones...which may actually be welcomed for relief from the dry weather. Hopefully we will get some sort of soaking rain in New Hampshire. With clouds, showers and cooler onshore wind, Highs on Friday will be in the 70's to near 80. Heatbreaker!
Weak high pressure will follow in for Saturday behind the departing rain with a drying NW flow, lower Humidity with highs in the Lwr-mid 80 in the increasing sunshine. Saturday will be the pick of the weekend. Another wave will approach the mid-Atlantic Sunday bring the potential for more heavy rainfall there. The question is how far north these showers will spread Sunday or will they stay just west of us? I have put in the risk of showers late Sunday into Monday as this second low will track closer to New Hampshire. Late Sunday into Monday could definitely turn a little wet. Drier, sunny warmer weather will be returning for the midweek with highs in the mid-80's in the the sunshine.