Monday, October 26, 2009

Washington, DC Precipitation Update: Deep Deficit to Solid Surplus

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October 27 Update: The 0.63" from last night through this afternoon brings the monthly total to almost 50% above the average to date. Current month-to-date totals:
Washington National  4.18"
Washington Dulles 4.38"
Baltimore (BWI) 4.85"
Original post:
The nearly 1" of rain which fell on Friday and Saturday, combined with the heavier amount the preceding weekend, has moved October's precipitation in the Washington, DC area from the large deficit of the first half of the month to a solid surplus. The month-to-date total of 3.55" at Washington National is 37% above the average through the 25th and is above the average for the entire month. Along with the 1"+ amounts forecast for the upcoming 5 days ending on Halloween, October has a good chance of joining April, May, and June in being 50% or more above normal.

Here are the storm total, month-to-date, and year-to-date precipitation amounts for the region:
Washington National  0.92"/3.55"/33.52"
Washington Dulles 1.73"/4.03"/37.26"
Baltimore (BWI) 1.00"/4.31"/40.64"

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