ScottBurns said:
I picked these stations up during the day, not at night.
Doesn't matter, tropospheric ducting doesn't follow the same rules as the ionispheric skip that causes distant AM signals to come in at night. You can have excellent tropo during the day or night hours.
Of the Providence market signals cited here, only WEEI-FM normally comes in through much of the Hartford area. That's thanks to it's transmitter location, power level and some accidents of favorable terrain that aid the line of sight in that direction. WHJY has a marginal signal that can be received on east-facing higher terrain to the west of Hartford, but not quite into the city unless you're high up in an office tower. It's main coverage area starts in Tolland, once you get past the first set of hills east of the CT River Valley. That being said, any little bit of tropo will bring it in to Hartford itself. Thanks to the 94.1 frequency being relatively open, that's the best Providence signal into CT (103.7 being based quite a bit to the SW of PVD).
As Marc alluded to, WCTK has long been one of the best indicators of a tropospheric ducting event in central CT. Their signal is not easily received in the area, unless there's some skip, then it comes in quite well. WJFD used to do the same thing, but is now blocked out by a station on the same 97.3 frequency in Litchfield.
And no, Hartford/New Haven/Springfield FM signals do not get in to Providence. That's simply due to unfavorable terrain, there is too much higher terrain to the west of the Providence/Cranston/Warwick area and those cities are down near sea level, facing east. Because of this, they can often get signals from Cape Cod - but rarely from the west. Much of central CT has higher terrain to the west and not-as-high terrain to the east and that favors reception from locations to the east and southeast. Line-of-sight reception is not necessarily reciprocal.
The SE New England region (Providence, New Bedford and the Cape and Islands) is an area that's prone to have more tropospheric ducting than inland areas. Because of that, their full-powered stations often bounce all over New England on those hazy, humid days. They do the same thing in S. NH and S. ME as they do in CT during those conditions. OTOH, rarely have I seen Hartford stations skip very far when there's tropo. One time, I got WDRC from Falmouth, MA and that was during an extraordinary ducting event that brought in lots of Long Island signals. It seems pretty unusual for that to happen.