NE Heat Wave Foiled - For Some

UPDATE: The clouds stayed all day. New York City's high temperature Saturday was 82; Hartford failed to get above 75.

ORIGINAL POST:
My aunt Emily, who lives in Hartford, Connecticut, asked me this morning:

Yesterday, I noted that both AccuWeather.com and the government were predicting 92 in New York City Sunday and 90 today. But today, both of us have lowered our prediction to 87, and it might not even get that high. What gives?

We can blame clouds from Canada. Take a look at the image from AccuWeather.com RadarPlus below. Click to enlarge it.

What you're looking at is temperatures in a gradient from orange (hot) to green (cool), with temperatures plotted in white. Underneath that is a visible satellite image showing the current cloud cover (more white = more clouds). Notice that areas like Boston and Providence, where the clouds never touched (the clouds are moving southward), are in the mid 80's. But my aunt Emily is in the 60s, because she's been under clouds all day.

Overnight, thunderstorms developed in Quebec and moved southward. As of 2 p.m. today, the cloudiness (and even some rain) left over from these thunderstorms still hasn't moved off the coast. The models either didn't predict this, or forecasters thought that the clouds would not cover New York City by mid-morning, when the temperature should have started to spike.

As soon as the clouds move off, the temperature will go up quickly as the sun heats the already-warm airmass over Connecticut and New York City. But now we've got no chance of record high temperatures in those areas.