September in Phoenix: Weather, What to Pack, and What to See All You Need to Know About India’s Epic Monsoon Season On average, the starting date for monsoon conditions in Phoenix is July 7 and the average ending date is September 13, but the official season starts and ends much later than the data supports—allowing for preparation for unexpected early and late-season monsoons. Historically, the earliest start date for the monsoon season was June 16, 1925, and the latest start date was July 25, 1987. The Weather and Climate on California’s Central Coast The position of that low tapped into moisture from the remains of a dying Hurricane Lorena to create conditions favorable for rain in Arizona.That kind of circulation is more typical of Arizona’s winter weather pattern.Monsoon conditions are caused by an area of high pressure that sets up in a position that draws moist air from Mexico into Arizona. The 2019 Arizona monsoon season will go on the official list as the fifth driest ever for Phoenix, but State Climatologist Nancy Selover said it should rank higher than that.The monsoon season, as declared by the National Weather Service since 2008, runs from June 15 through Sept. 30. “The ones that did happen in the high country totally ran out of steam before they got anywhere near us.”According to National Weather Service data, there were only 12 days during the monsoon season in which Phoenix saw even a trace of rain.However, the rain gauge at Sky Harbor didn’t tell the complete story of the monsoon in the Valley.A weather service social media post on Sept. 27 showed that Phoenix’s official weather station was in one of the driest parts of the Valley this monsoon season.“This year Sky Harbor was the doughnut hole,” Selover said. Jillian Dara is a freelance travel writer and fact checker.

Among those was having a standardized 108-day stretch that didn’t vary from year to year.Prior to 2008, the monsoon in Phoenix was determined to start on the first of three consecutive days with an average dew-point temperature of a least 55 degrees.

Normal for the season is 8.31 inches.Bellemont (3.03 inches of rain), Grand Canyon Airport (1.72 inches), Phantom Ranch (0.45 inches), Show Low (3.83 inches) and Teec Nos Pos (0.77 inches) also had record dry monsoons. After that, the monsoon would end usually after the sort of transition event the state experienced last week.“Officially, we declare a season from June 15 through September 30,” Waters said. Manufactured homes are especially susceptible to damage as they're typically not designed to withstand unusually high winds or other severe weather.

This was not a monsoon event. The greatest number of consecutive monsoon days (with dewpoints above 55 degrees) was 72 from June 25 through September 4, 1984, which was also the greatest number of consecutive days with dewpoints of 60 degrees or higher. Palm Springs: Everything You Need To Know About Desert Weather

"There’s no question about that.”Though some sticklers for tradition didn't like it, the weather service established a defined monsoon season in 2008 for several reasons. The 2019 Arizona monsoon season will go on the official list as the fifth driest ever for Phoenix, but State Climatologist Nancy Selover said it should rank higher than that. Because air flows in a clockwise fashion around high pressure, that usually means that high-pressure area is to the east, often in the Four Corners area.Ken Waters, a warning coordination meteorologist with the National Weather Service in Phoenix, concurred with Selover’s assessment of last week’s weather to a point.He said monsoon conditions don’t end suddenly but gradually wane. Dewpoint conditions required for monsoon weather are recorded 56 times a season on average, but the greatest number of monsoon days in Arizona was 99 in 1984 and the lowest number of monsoon days was recorded in 1962 at just 27 days. "According to Maricopa County Flood Control District rain gauges, several places in the Valley recorded much more rain than Sky Harbor.Statewide, many reporting stations were below normal for the season, with six northern Arizona locations reporting their driest monsoons on record, according to the NWS Flagstaff office.Flagstaff saw its driest monsoon (records go back to 1898) with 2.08 inches. Beginning in 2008, the National Weather Service established June 15 as the first day and September 30 as the last day of the state's monsoon season, allowing visitors and residents alike to pay attention to monsoon safety rather than the technicalities of the season's start and end dates. Prior to 2008, the Phoenix area monsoon season was considered to start when there were three consecutive days that the Normal for that time span is 2.71 inches, according to NWS records that go back to 1896.The 1924 monsoon was the driest on record at 0.35 inches of rain. "Once you get past that you get a little bit of a change where there is more influence from non-monsoonal weather, like a fall-type pattern setting up, that type of thing. Judy Hedding is a Phoenix resident and has written more than 1,000 articles about Greater Phoenix and Arizona since 2000. “There have been years when it was kind of the bullseye, but this year it was the doughnut hole.”Waters said there was no meteorological reason why Sky Harbor was relatively dry this year. “We were all hoping for a least a nice normal monsoon after a wet winter. “Because nothing that happened (last) week had anything to do with the monsoon. In that 108-day span, Phoenix’s official rain gauge at Sky Harbor Airport picked up just 0.66 inches of rain. In order to better prepare for monsoon season, it's important to review safety guidelines for being caught in gale-force winds. On average, the starting date for monsoon conditions in Phoenix is July 7 and the average ending date is September 13, but the official season starts and ends much later than the data supports—allowing for preparation for unexpected early and late-season monsoons. What to Expect From the Weather in Charlotte Year-Round Just like you would in a tornado, bunkering down in a door frame or the bathtub away from windows is your safest bet if you can't get to a shelter before the storm.

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