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January 30, 2009

Groundhog Day storm track favors rain, then snow

Forecast models overnight have been moving the projected track of next week's storm farther to the east. If that trend continues, it would increase the chances the Baltimore and Washington would see a significant snowfall Monday night into Tuesday. But only after some initial rain.

As is so often the case around here, nobody's really sure yet where that track will finally decide to go. A drift to the left might take the storms along the Appalachians to our west, or directly over us, and that would give us a heck of a rain storm, but little significant snow.

AccuWeather.comInland locations from the Great Lakes to New England seem to be in line for a big snow no matter what happens. Some locations could see blizzard conditions. And big rains and winds in coastal regions could trigger all sorts of runoff and flooding problems.  

What snow lovers here want to look for is a storm path that drifts right, and takes the low out to sea to our south, and then up the coast to our east. That would allow more cold air to drop down, start the changeover to snow sooner and allow it to pile up higher before the storm goes away.

For now, all the prognostication seems to have very cold air moving into Maryland tonight, with some snow showers possible and an overnight low in the teens. Saturday's high will stick in the mid-30s, with sunshine. As the high departs on Sunday, it will draw warmer air in from the South, pushing daytime highs into the 40s, and maybe even some 50s. Great for Super Bowl parties; not so much for snow.

But the show really starts on Monday. The National Weather Service is currently predicting the storm center will move off the coast Monday, bringing us rain first . But the storm's passage will also draw  that big surge of cold air down from the north and west Monday evening. The changeover to snow - if it comes - will depend on the timing. If the cold air arrives in time, the rain will change to snow.

The NWS discussion this morning says: "Rain expected by Monday afternoon [in] all areas except along the Allegheny Front, where cold air invades by late afternoon. Expect cold air to advance eastward Monday evening, with snow spreading to the Blue Ridge by late evening, and perhaps asSun Photo/Weyman Swagger 1983 far as the metro areas by morning."

On the other hand, one of the models - the GFS - takes the storm right through Washington, DC, which would mean heavy rain - an inch or two for the cities overnight, forecasters said.

Even so, they add, "regardless of the storm track Monday night, cold air should spread across the region by Tuesday morning, and any precipitation Tuesday/Tuesday evening should be snow" as the storm pulls away.

Not the definitive forecast we'd like, but things should become crystal clear by Sunday. So prepare to flip between the Super Bowl and the Weather Channel.

And if you snow lovers need some hype to keep your hopes up, here's AccuWeather.com's Hypster Extraordinaire, Henry Margusity, who's calling the current storm track forecast "a great track now to dump heavy snow in D.C. and Baltimore."  (That's the 1983 storm in the B&W photo above.) 

Here's AccuWeather.com's lead story on the storm.  

Posted by Frank Roylance at 11:00 AM | | Comments (7)
Categories: Forecasts
        

Comments

C'mon, storm, drift right, drift right!

On a side note...will Punxsutawney Phil even be able to see his own shadow if it's snowing at Gobbler's Knob on the big day?
FR: Not bloody likely.

Can a groundhog even see its own shadow? And even if so, how can we know? A philosophical conundrum for the ages....

I cheerfully invite any of you snow lovers to come to my house and shovel my sidewalk, dig out my car, plow the streets, drive me to work and take me home again. Once you're out of school there is no charm in "Snow Days."

Haha. I love your analysis of Henry Margusity. Even though he hypes everything up, its enjoyable to watch. I have come to the realization to not trust any weather past two days.

And with these winter storms I don't trust anything till it happens. I've realized when two different models,(ex. NAM and GFS) totally disagree with eachother, nobody knows whats gonna happen. Like NOAA and TWC are in slight the disagreement with each other right now.

I love your blog. Please continue to post the conversations of the National Weather Service, I enjoy reading them.

FR: Thanks! You're right. Nobody knows what this storm is going to do ATM. The NWS discussion is oddly unintelligible. AccuWeather seems to be thinking 2-4 inches, more up the coast. . The storm track keeps slipping eastward, which would be good for us if we want snow. But what if it goes too far to sea? I'm going to give it another 24 hours and let things sort themselves out. By the way, if you missed the weather page comments in the print editions today, it's because our computer system ate them on deadline, and the early editions had closed before we retrieved them. Sorry about that. We're back tomorrow.

I'm confused about 1 thing. Isn't the Superbowl coming after the storm, on February 6?

FR: You are responding to a 2009 post.

The Superbowl is 2/6, not tomorrow.

FR: You are responding to a 2009 post.

The confusion about the Super Bowl is understandable. Thoug hthe post above is from 2009, the Pittsburgh Steelers were in the forthcoming Super Bowl that year, just as they are this year. Not to rub it in, or anything.

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About Frank Roylance
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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