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July 26, 2011

Huge rain totals in Monday storm

A blog comment from "djordan" this afternoon called my attention to the rain that fell with thunderstorms across Central Maryland as the cold front swept through on Monday.

I was deep in an interview in East Baltimore as the thunder announced the storm, and it was over by the time I got out. So I missed it entirely. But djordan wrote to me:

"Frank, were any rainfall records set yesterday? I got caught in that never-ending thunderstorm in western Howard Co...I understand over 3 inches of rain fell in 1.5 hours or something like that."

So I checked CoCoRaHS Network data and found some impressive totals:

Eldersburg:  3.49 inches

Woodbine:  3.21 inches

North Laurel:  3.20 inches

Sykesville:  2.98 inches

Gaithersburg:  1.99 inches

Towson:  1.59 inches

Baltimore:  1.50 inches

Cockeysville:  1.22 inches

The Sun: 0.83 inch

I can't say whether any of these totals are records for the date in the places where they were measured, because the only official record-keeping in the area is the NWS station at BWI.  The wettest July 25 on record there saw 2.00 inches fall in 1978. So if the storm had stalled a bit farther east, over BWI, we would have demolished the record for the date.

As it was, BWI reported just 0.64 inches, so, officially, there was no new record.

Posted by Frank Roylance at 4:09 PM | | Comments (2)
Categories: Events


I ended up driving southeast in the teeth of the storm, from Owings Mills down to Sinai Hospital. We briefly got ahead of the storm, but then took a brief detour into Pikesville and got completely smacked again.

I haven't seen that much consistently heavy rain in quite a few years. We had that ferocious t-storm a couple of summers ago that flipped our trampoline, but it didn't last too long. And the lightning yesterday was quite impressive, too.

All in all, it was a heck of a storm. We actually needed to slow down on the JFX, because visibility was so poor.

Good times, good times! ;-)

We need more Maryland weather stations of record, especially given BWI's previous performance recording snowfall.

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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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