![]() As the previous table illustrates this fell short of the September single-hour record of 1.41” that occurred during the storm of September 1939. ![]() Note that the greatest single hour of precipitation was 1.02” at the beginning of the storm between 2 a.m.-3 a.m. Hourly METARS at Phoenix Sky Harbor Airport on the morning of September 8th. Table from ‘Climate of Phoenix: NOAA Technical Memorandum NWS WR-177. Sorry this is hard to read: here is the table from the document. Monday’s rainfall was a new 24-hour record for the month of September and the 2nd heaviest such on record. Record rainfall totals for Phoenix by time period and month since official observations began in 1896 and through 1995. The September 1939 event was similar to yesterday’s (September 8th) in that a dissipating tropical storm over the Eastern Pacific was responsible for the inflow of moisture. However, the 3.29” does rank as the 2nd greatest 24-hour rainfall (beating out 3.06” on September 3-4, 1939). On July 1-2, 1911, 4.98” was measured in one 24-hour period at, what was at that time, the city’s official observation site. Meanwhile, across the country in Virginia, over 12” has fallen near Smithfield in 24 hours.Īlthough the Phoenix total of 3.29” (all of which fell in seven hours between 2 a.m-9 a.m.) was a calendar day rainfall, beating the 2.91” that fell on September 4, 1939, it was not a record 24-hour amount for the city. The official weather site at Phoenix’s Sky Harbor Int’l Airport picked up an all-time calendar day precipitation amount of 3.29”. Moisture associated with former Hurricane Norbert swept over southern California, southern Nevada, and Arizona on Monday resulting in record rainfall for parts of Arizona and flash flooding that took the lives of two.
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