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November 13, 2009

24-hour rain totals top 5 inches in St. Mary's Co.

While Baltimoreans may simply be tired of the gray, and the gloom, and the drip, residents of Maryland's southern counties - on both sides of the Chesapeake, are dealing with a serious deluge of rain and high tides from the big coastal storm that remains almost stationary off the NOAACarolina coast, driving wind, rain and water inland.

Here's an animation of the storm's water vapor movement, from satellite sensors.

Precipitation totals in St. Mary's County for the past 24 hours have topped 5 inches, with some locations reporting nealy six inches and one - Great Mills - exceeding 7 inches. Normal rainfall for the month of November at BWI is 3.12 inches.

Here is a rain total map for the storm

High water and fallen trees have forced a number of road closings in the Leonardtown area, and delayed delayed school for some students Thursday as buses were re-routed around flooded roadways.

Ocean City has received 3.69 inches of rain since the storm arrived, the heaviest falling early Thursday evening. That's the Rehoboth Beach Web cam below.

Coastal Flood Warnings remain in effect Friday morning for Charles, Calvert and St. Mary's counties. Tides were expected to run 2.5 to 3 feet above normal  into Saturday before the storm begins to drift away from the mainland. Colton's Point and St. George's Island in St. Mary's County, and Solomons Island in Calvert were warned to expect significant flooding.

In addition, Ocean City was under Wind Advisories until 7 p.m. Friday. An earlier hHigh Wind Warning was cancelled. Winds are now forecast to Rehoboth Beach camaverage 25 to 35 mph, with gusts to 50 mph before weakening late in the day. With the soil saturated, such winds can be expected to topple some trees, causing more power outages. The Atlantic coast is also under a High Surf Advisory until 6 p.m. Friday. Tides at the Inlet are expected to exceed predictions by more than 5 feet, with moderate flooding in Ocean City.

Coastal Flood Advisories were up for Anne Arundel and Prince George's counties. Gale warnings and small craft advisories were posted for the Chesapeake. 

The rain amounts decrease as you travel north almong the Western Shore. Prince Frederick, In Calvert County, recorded 4.18 inches by Friday morning. Baltimore-Washington International Thurgood Marshall Airport reported 1.24 inches. The storm has left just under an inch here at The Baltimore Sun in downtown Baltimore.

Here is a list of rain reports, as of Friday morning, from the National Weather Service.

As thick and damp and gloomy as it is here, it's interesting to note that clear, dry, sunny weather lies barely 150 miles to our west, beyond the reach of this slow-moving nor'easter.

Oakland, in Garrett County, is reporting "a few clouds" this morning. Elkins, W.Va. is sunny. So are Pittsburgh, Pa., and State College, Pa.  

Posted by Frank Roylance at 10:35 AM | | Comments (1)
Categories: By the numbers


Frank, an outstanding job as always covering the wide range of impacts from storms such as these. What a doozy this has been for so many people. And to think that one component run of NOAA's GFS (Global Forecast System) model last week actually was showing the 9+ inches for SE Virginia, and the 5+ in southern MD. Few if any (including me) truly believed it.

Makes one wonder if this winter may become a case of "be careful for what you wish!" Were this to have been snow, we'd be measuring with a meter stick in some spots and trying to dodge the Caterpiller clearing machine in others.

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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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