The first day of the meteorological summer promises to be a peach for Baltimore, with highs near 80 degrees, blue skies and low humidity. But the clouds move in tomorrow, with increasing chances for showers and thunderstorms for the rest of the work week.

Looking even farther ahead, the summer promises to be warmer than average for Baltimore and much of the East and Gulf coasts (left), according to the seasonal forecast from the National Weather Service's Sterling Forecast Office. But the precipitation forecast, for now, shows no clear trend away from the norms.

First, this week: If you slept with the windows open last night you probably awoke to a pretty chilly room this morning. It was 46 degrees out on the WeatherDeck in Cockeysville at daybreak today, and 67 in the bedroom. BWI-Marshall Airport slipped to 46 degrees, too. That's not too far from the record low for a June 1 at Baltimore - 42 degrees, set back in 1966.

We're enjoying the benefits of a high-pressure system, with dry air and clear skies. Radiational cooling did the rest, allowing yesterday's solar heat gain to dissipate back into space. There were frost and freeze watches and warnings posted early today from Pennsylvania to Maine.

So enjoy this gorgeous day, if you can. Tomorrow, the next cold front slips closer to the region, increasing our cloudiness and bringing increased chances for showers and thunderstorms as warmer, wetter air from the south runs into the front. Lows Monday night and Tuesday morning should be milder than this morning's, in the 60s.

The chances for rain increase to 50 percent by late Wednesday into Thursday. The front is expected to stall just to our south by Thursday and Friday, leaving us under cloudy skies with  continuing chances for showers.

The computer models disagree on our weekend weather. The NWS seems to be leaning toward another stalled cold front and more showers. June begins to sound a whole lot like May, doesn't it?