Moving this over to banter to add-on as I don't want to interrupt (checks notes) yet another snow obs from areas that are (checks notes again) NOT where I currently am...
@H2O wrote...
I cannot agree with this enough. I've been in the Baltimore urban heat island area since 2009. I work downtown (maybe no feet of elevation) and from 2009 - 2014 lived in the Hamilton neighborhood (maybe 300 feet of elevation) and from 2014 - present live in the Roland Park/Hopkins/Hampden juncture (about 458 feet of elevation). Within my working memory, it has gotten REALLY hard to score anything of note in the city center in marginal temp set-ups and still difficult at the my current elevation to score like others do in marginal set-ups. Now, some of this is just the snow climate - there's a reason that Parkton averages more than Towson than averages more than downtown Baltimore and so forth. But my guess is that there is now a chipping away at the margins due to...more urban heat? climate shifting? dunno? than there used to be. I know that the March snows that have made many so very happy the last few years have been frustrating inside 695 - hard to get going, hard to sustain rates. Like yesterday - which was hard to get going. There is no question that inside 495 and 695 can and do very well in legit storms. But I have decided that much of the board tension (to the extent there is tension) with respect to snow climate, expectations, and the like, comes down to what kind of storms that people need to really see snow fall and accumulate well. For those of us inside 495 and 695 in particular, we really have to become default big game hunters. The "big ones", with good arctic air in place, copious moisture, and forecasts of 6+ inches give us the wiggle room to deal with all the temp, boundary layer, dew point, UHI and other issues we need to overcome to really accumulate. When I big game hunt, it is because I need to see those kinds of ingredients available for a storm to know that we have a better than even chance of overcoming the handicaps of living in the UHI areas.
Now, again, I know (and agree!) that historically it is going to be slightly harder to score events in these areas (even pre-UHI) - but my working thesis is that it is even harder now on the margins and that a lot of marginal events are really too marginal for inside the beltways for whatever reason than they used to be. It is why the "we can score in March" isn't necessarily that comforting for some of us (particularly as we cross past March 10th or so).
In any event, just wanted to high five h20's observation. And note that temp, sun, and other worries can be legit for many of us depending on the set-up. I'm not gonna worry about sun with an arctic high near-by, a storm approaching and temps at 35. But in events like yesterday? Where every degree matters and there isn't an obvious cold air source around? Morning sun was not so good for my zip code(s)...