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September 12, 2011

Last week's rains defied the odds


Just how unlikely were the heavy rains the region received last week from remnants of Tropical Storm Lee? NWS hydrologist Jason Elliott has done some calculations using data from the Integrated Flood Observing and Warning Systems. He found a rain rate of 4.57 inches in three hours at a Bowie gauge. That was a once-in-200-year rainfall. Near Ellicott City the rains ranked as a 50-to-100-year event. Fort Belvoir, Va. reported 7 inches in 3 hours, more than a once-in-1,000-years deluge.  

Posted by Frank Roylance at 4:40 PM | | Comments (2)
Categories: From the Sun's print edition


Good day, Mr. Roylance,

Is there a site which shows the rainfall or snowfall in the Randallstown-Pikesville area? I know the Scotts Level Stream behind my house was higher than it's been in a long time, easily a few decades. I was worried water would reach my back yard, which only happened during Agnes (David reached near the top of the hill separating yard from woods.

Thank you.

FR REPLIES: You can try the CoCoRaHS Network. Just enter the date you need, click on "Get Reports" and then scroll down to the community you're looking for. It's unofficial, but these observers are pretty conscientious.

Frank thanks for this newsbit! We had 6+ inches over the whole week near Rockville according to the local weatherbug station. I remember in June 2006 we had another tropical storm with nine inches! Remember when Lake Frank almost burst it's dam?

FR REPLIES: There's a Lake Frank? Why wasn't I told?

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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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