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PITTSBURGH UNDERWATER


DBR96

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PITTSBURGH PRECIPITATION RECORDS IN PERSPECTIVE...

Daily precipitation (September 17, 2004):

5.95"

Wettest days on record:

1. --- September 17, 2004 (5.95")

2. --- September 8, 2004 (3.60")

3. --- August 21, 1888 (3.57")

4. --- October 15, 1954 (3.56")

5. --- July 28, 1999 (3.48")

6. --- September 17, 1876 (3.38")

7. --- September 12, 1878 (3.24")

8. --- October 2, 1929 (3.22")

September 17, 2004 was the wettest day in Pittsburgh history. The old daily rainfall record (set just nine days earlier) wasn't just broken --- it was shattered.

Monthly precipitation (September 2004):

9.78" ***

Wettest months on record:

1. --- November 1985 (11.05")

2. --- June 1989 (10.29")

3. --- June 1951 (10.51")

4. --- September 1945 (10.08")

5. --- September 2004 (9.78") ***

6. --- July 1887 (9.51")

7. --- April 1852 (9.27")

8. --- July 1896 (8.96")

9. --- July 1992 (8.71")

10. --- December 1990 (8.51")

*** - through September 19, 2004

Only 1.28" of rain is needed between now and the 30th for September 2004 to be the wettest month in Pittsburgh history.

Yearly precipitation (2004):

47.99" ***

Wettest years on record:

1. --- 1990 (52.24")

2. --- 1890 (50.61")

3. --- 1865 (50.50")

4. --- 1950 (48.38")

5. --- 1945 (48.20")

6. --- 2004 (47.99") ***

7. --- 1846 (47.79")

8. --- 1975 (46.42")

9. --- 1847 (46.22")

10. --- 1996 (45.47")

*** - through September 19, 2004

Only 4.26" of rain is needed between now and December 31 for 2004 to be the wettest year in Pittsburgh history.

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The problem in Pittsburgh is that precipitation levels have been above normal all year, so the ground was already excessively moist even before Frances and Ivan came to town. This is the first time I can remember that every month of the year (so far) has had precipitation levels above the monthly average in Pittsburgh. One meteorologist described the Pittsburgh region as a "wet sponge" that can't take on any more water.

http://www.weather.com/maps/maptype/severe...rity_large.html

Above is The Weather Channel's "Palmer Drought Index" map. Most of Pennsylvania is shaded in dark green. Meanwhile, other areas affected by Frances and Ivan are shaded either light green or not at all. The ground in these areas is still capable of holding extra water; meanwhile, the ground in most of Pennsylvania is not.

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