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Abundant tropical moisture fueled a rare rain event in Harrisburg, Pennsylvania, on the evening of July 23.
Harrisburg International Airport received 4.27 inches of rain in a single hour, from 5:56 to 6:56 p.m. EDT. A rainfall event of this magnitude in Harrisburg has just a 0.1-percent chance of happening in a given year, according to data from NOAA.
The total rain for the day at Harrisburg International Airport tallied up at 4.71 inches. This now stands as the wettest July day on record, and the fifth-wettest day overall for any month of the year at that location.
This downpour was extremely localized. Harrisburg's Capital City Airport, just a few miles to the northwest, saw less than a half-inch of rain during the same evening.
2. A Rarity in 140 Years of Records
A trace of rain was recorded in downtown Los Angeles on July 24, which is a rare event for that calendar day and the month of July in general. Only three other times in history has any rain been observed there on July 24. A trace was also recorded on July 24 in 1954, 1941 and 1910.
July is the driest month of the year in Los Angeles. A vast majority of Julys since the late 1870s have gone without any measurable rain in the nation's second most-populated city.The reason Los Angeles is so dry this time of year is that the jet stream moves far to the north, taking the storm track away from California.
Typhoon Noru and the former Tropical Storm Kulap already performed the Fujiwhara dance in the western Pacific last week.
