Wednesday, September 7, 2011

Record Daily Rainfall for September at Harrisburg

Sept. 8, 2 PM Update: The final Harrisburg daily rainfall total for Sept. 7 is 7.71". The 2-day total is 9.73". The storm total since Sunday evening is 13.30" as of 9 am today.

Sept. 8, 1 AM Update: Heavy rain has continued through midnight at Harrisburg, with 2.08" just in the hour ending at 1 am EDT (midnight standard time). That puts the daily total at the 2nd highest of all time.

Original post:
Downpours from the remnants of Tropical Storm Lee have been producing record rainfall amounts in the Mid Atlantic area. The National Weather Service reports that the 5.05" of precipitation as of 5 pm today at Harrisburg, Pennsylvania has already smashed the old daily record of 1.18" set in 1998. Unofficially, this is also an all-time daily record for September, beating the 4.59" on Sept. 26, 1975. The top two all-time daily rainfall records at Harrisburg were set on June 21 and 22, 1972 from the remnants of Hurricane Agnes. Today's amount is now the 3rd highest all-time amount.

The 2-day total on Sept. 25-26, 1975 was 8.87". Together with the 2.02" yesterday, the current 2-day total is 7.07". Climate records began at Harrisburg in 1888.

The previous top 10 daily rainfall amounts at Harrisburg:
22-Jun 1972 9.13
21-Jun 1972 5.81
31-May 1889 4.66
23-Aug 1933 4.66
26-Sep 1975 4.59
14-Sep 1973 4.34
21-Aug 1915 4.30
25-Sep 1975 4.28
10-Sep 1907 4.17
23-Jul 1969 4.00
Image (click to enlarge): Mid Atlantic radar image September 7, 2011, from Accuweather

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