The
National Weather Service in Gray Maine issued a Flash Flood Watch for this afternoon and evening for central and northern New Hampshire. This is for anticipated thunderstorms with heavy rain that could drop 1 to 3 inches of rain in addition to the 1"+ we had in the last 24 hours.
Forecasters at Gray ME and also at the
Storm Prediction Center in Norman OK are monitoring for the possibility of a severe weather outbreak today. Right now the cloud cover is preventing the heating necessary for the storms to form. If the cloud cover breaks and allows sun to warm the low-level air, it will rise into the much cooler air aloft and form thunderstorms. Some of the storms would be capable of producing large destructive hail, damaging straight-line winds, and conditions are right for isolated tornadoes today.
It all depends on whether or not the sky clears to allow the sun to heat things up near the ground.
SPC has outlined much of New England south and west of the Maine border in a slight risk for severe weather today and stated they may need to upgrade to moderate if the sky clears soon enough. Remember, theirs is a sensitive scale on which "slight" is worthy of attention, "moderate" is a dangerous situation, and "high" is only seen a handful of times each year, usually on the Plains.
In any case, plenty of non-severe thunderstorms (lacking damaging hail or damaging wind) are expected to develop and bring heavy downpours to many communities late this afternoon and evening.