Posted by Chris Lambert
With tropical moisture in place, instability in the atmosphere and a bit of spin to it, it certainly was an interesting afternoon with tornado warnings popping north and west of the Boston area. While it appears that no tornadoes touched down in our area (as of this 6PM writing), significant rotation of a few of the storms created what looks to be a wall cloud near Lynn and a weather spotter reported a funnel cloud from the thunderstorm near Danvers (per The Weather Channel). Also, scattered reports of tree damage from win has come in.
In Windsor Locks, CT, a tornado did touch from 1:30-1:35PM, max winds were estimated at 86mph and the path length was 2.5miles. Also, the possibility of a microburst or tornado is being looked at in Agawam, MA.
Rain was another story with a quick 1-2" of rain creating street flooding and commute problems. 1-2" of rain isn't necessary a problem in a storm over a day, but when it falls in 30 or 45 minutes, it's just too much too fast.
So where do we go from here? Scattered showers remain overnight, but they won't be as intense.
The set-up for tomorrow looks to provide another active day as the same ingredients are almost in the same spots. I say almost, because it looks like wind shear (change of speed/direction with height) could be less. That'll decrease the chance of rotating storms, but we still have to keep an eye on it. Locally heavy rain is once again an issue.
Wednesday, storms are scattered in the afternoon, but we start the transition to more stability with storms becoming fewer and farther between on The Fourth and into the weekend as temps near 90.