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October 28, 2009

It's not snow

Western Run 

Sure, it's been raining like crazy. The airport has recorded nearly two inches since this latest rainy spell began Tuesday. Half of that has fallen since midnight. We had about the same out on the WeatherDeck in Cockeysville - 1.92 inches since this began, and 0.73 inch since midnight. Western Run, above, is running high and fast.

Here are some more 24-hour totals from around the region from the NWS. Here are more reports from CoCoRaHS. A number of locations on the Eastern Shore and in Anne Arundel County reported more than 2 inches. NOAA

Greensboro (Caroline Co.):  2.74 inches

Vienna (Dorchester): 2.44 inches

Ocean Pines (Worcester): 2.34 inches

Selby-0n-the-Bay (Arundel): 2.26 inches

Towson (Baltimore): 1.88 inches

At the airport, the rain has taken us to roughly 6.30 inches for the month, by my calculations. And that brings the year's total to about 43 inches - two inches more than the annual average for Baltimore, and more than in 10 of the last 20 years. And it's not yet November.

But just imagine if this were January, or February. The rule-of-thumb for converting rainfall into snow depth is 10 inches of snow for every inch of rain. Now, that's an average of some kind. Light, fluffy snow will be deeper than wet, heavy snow.  But a 1.9-inch rainstorm might have been a nearly 20-inch snowstorm had these same conditions assembled themselves here in, say, the second week of February.

And who knows? Maybe they will. How's that for a Halloween scare? 

Anyway, the bulk of the rain has moved off to the northeast. The National Weather Service is calling for mostly cloudy skies for the next few days. We may see some sunshine peek through. But the next cold front is due through here Friday into Saturday, with more showers on the menu before the month ends.

(SUN PHOTO/Frank Roylance; NOAA graphic) 

Posted by Frank Roylance at 10:19 AM | | Comments (2)
Categories: By the numbers
        

Comments

Washington National has now had a record number of extreme Octobers (dry or wet) this decade.

2 inches of rain over two days should not cause lanes of major roads to be flooded. that is a problem because in the future it is possible we will face many more inches of rain in a similar time span and could need majoy roads to be accessible.

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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.

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