Posted by Pete Bouchard
Humidity's on the rise in the coming days. Nothing we haven't seen before, and nothing as torrid as we've been through. One of the mitigating factors this time around is the cloudcover. There's more of it, and it will temper the heat.
We talked about how this humidity will fuel the storms, and we weren't messing around. They won't either. If you get a storm, you've got a problem. Torrential rain will be a concern as the steering currents in the upper atmosphere remain weak. That means ponding, street flooding and brief rises on local streams.
Not everyone is under the thunder threat tomorrow. Most storms will form north and west of Boston tomorrow afternoon. From the South Shore to the Cape, we should stay dry until late evening.
Thursday will still see a thunder threat, but it's mainly in Eastern Massachusetts this time around.
Weekend's still a tough call. A lazy front will mosey over New England Saturday, and our forecast hinges on it clearing the coast by Sunday morning. If it doesn't, Sunday could be damp to start, and cloudy to finish. I have my doubts about this front dragging its feet, therefore, I'm playing up the Sunday forecast as brighter and less humid. Obviously, much can change by the time we get to the weekend, so this isn't the final word...
...but this is: