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January 14, 2009

Or not ... Tuesday now looks cold, sunny

The forecast for Tuesday's Inauguration Day festivities continues to shift as forecast models adjust to new information. This morning's offering calls for noontime temperatures in the upper 20s, with mostly sunny skies and increasing afternoon winds.

Sun Photo/Doug Kapustin 2004But that all depends on the timing of what forecasters see as a series of weak storms that will be tracking out of the Great Lakes and out to the Atlantic with flurries and snow showers. We could see some of that during the day on Tuesday. For now, however, they're going for sunny and cold. Here's's take on Tuesday's weather.

The more immediate concern is for the approach today of the coldest temperatures Maryland has seen in years. Barack Obama's visit to Baltimore on Saturday will be sunny, but uncomfortably cold.

Canadian high pressure is already rolling into the region today (infrared satellite image below), which explains today's sunshine, rising barometer and temperatures that are unlikely to climb above freezing.

The instruments here at The Sun dipped under 32 degrees around 2 a.m. this morning and are unlikely to rise above freezing again until Sunday - four-and-a-half days of freezing weather.

"Winter has definitely settled into the mid-Atlantic," the morning discussion from Sterling observes. "Two straight nights of sub-zero and single-digit wind chills are close at hand."NOAA

The first in this series of weak little storms that are expected to barrel through the region over the next week or so is most likely to pass to our north late tonight. Forecasters have posted a 30 percent chance for snow here. But they don't seem very impressed. No more than a half-inch dusting is forecast early Thursday morning, if that. Not much, but a half inch would nearly double our pitiful snow total for the winter (0.6 inch at BWI).

Behind the clipper comes the truly arctic cold air. Thursday will be windy and dry, with temperatures falling after a high in the upper 20s. Wind chills will be driven far lower by gusting above 30 mph. Overnight lows Thursday into Friday will sink to the lower teens - and single digits to the north and west. Friday's high will struggle for 20.

Be thankful the inauguration isn't on the 16th.

Friday night into Saturday will be the coldest period of the week, with lows in Baltimore in the single digits. Thankfully, winds will be light.

As the high moves out to sea, we'll start to get a return flow of air from the South, which will raise humidities and boost temperatures into the upper 20s for Saturday, and above freezing - barely - on Sunday. That's still 10 degrees below the long-term average for this time of year.

Small chances for snow also return with the next in the week's series of weak storm systems out of the Great Lakes. The best chance for flakes is Sunday, but it sounds like more flurries and snow showers, if that.  

Posted by Frank Roylance at 10:49 AM | | Comments (0)
Categories: Forecasts

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About Frank Roylance
This site is the Maryland Weather archive. The current Maryland Weather blog can be found here.
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page. Frank also answers readers’ weather queries for the newspaper and the blog. Frank Roylance retired in October 2011. Maryland Weather is now being updated by members of The Baltimore Sun staff

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