The cloudbase / ceiling is the elevation range of the bottom of the cloud. The Heat Index Graph, devised by the National Weather Service, uses temperature and humidity values to determine the heat index. So we have concluded that while increases in irrigated and sprinkled areas and open water surfaces may have occurred in the growing Phoenix area, many other effects of urbanization have apparently produced an overriding, counteracting impact on the atmospheric moisture levels. The results of these tests can be found at http://www.nws.noaa.gov/mdl/synop/smbpublications.php. A) The list of cities shown is the cities in which the National Weather Service has forecast for. There are two separate rainfall seasons. While this is classified as a rainfall season, there can be periods of a month or more in this or any other season when practically no precipitation occurs. Monsoon Storms Slam Phoenix Area With 70-MPH Winds, Heavy Rain, Blowing Dust; More Than 84,000 Lose Power in Arizona.

The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. The Salt River runs from east to west through the valley, but, owing to impounding dams upstream, it is usually dry. During July and August, there is an increase in humidity, and there is often considerable afternoon and evening cloudiness associated with cumulus clouds building up over the nearby mountains. The average hourly wind speed in Phoenix on September 27 varies throughout the day, with a … Our analyses showed that trend was not the source of non-random inter-annual variation in June (or any other month). By November, the mild winter season is definitely established in the Salt River Valley region. Thus any urban effect on humidity should be clearly evident.

You can check our list against the NWS list by visiting this page and comparing it to our list of cities. Summer thunder­showers seldom occur in the valley before evening. Elevation of the center of the Moon above (positive) or below (negative) the horizon (black line). Brian Donegan is a meteorologist at weather.com. Windfinder specializes in wind, waves, tides and weather reports & forecasts for wind related sports like kitesurfing, windsurfing, surfing, sailing or paragliding. In support of this new means of transportation, another Weather Bureau office was established atSky Harbor Airport on May 2, 1933, and observations were taken there also until July 1935 when Department of Commerce radio operators took over the program. Phoenix is located in about the center of the Salt River Valley, a broad, oval-shaped, nearly flat plain. The temporal variations of several of these elements is shown in the graph on the following page.

Check your conditions before you launch and only launch in conditions that you are familiar with and are certified to fly in. All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. The normal temperature change from the beginning to the end of this month is the greatest of any of the twelve months in central Arizona. The daily amounts of solar energy that are received at the top of the atmosphere (the extra-terrestrial radiation, or ETR) is shown in curve A. The first option will be automatically selected. Meanwhile, the development of air transportation and teletype communications in the 1920s and 1930s altered and redirected somewhat the purpose of the Weather Bureau as first defined by the law in 1890. Despite local interest in atmosphere moisture trends in the valley, surprisingly little scientific research has directly addressed this issue. The climate is of a desert type with low annual rainfall and low relative humidity. You can estimate what the forecast might be at a particular time by using the times before and after the time you want. The arrows point in the direction that the wind is blowing. Phoenix records were checked back to 1896 to find the highest humidity ever for each temperature from 100 through 118 degrees. The percentage of time spent at various humidity comfort levels, categorized by dew point.

Weather map with the current Wind Direction for Arizona. Use website settings to switch between units at any time.

[2] [3] Iberdrola Renewables built the wind farm in 2009 for $100 million, [2] and sells the output to Salt River Project . The user assume the entire risk associated with the use of this data.

For those 6% of years with precipitation on October 20, the chart below shows when throughout the day that precipitation is more or less likely to occur, excluding hourly accumulations of less than 0.01 inches. Nighttime temperatures frequently drop below freezing during the three coldest months, but the afternoons are usually sunny and warm.

The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. Elevation of the center of the Sun above (positive) or below (negative) the horizon (black line). Civil twilight and night are indicated by shaded overlays. document.write('Webmaster'); Records had been kept in Phoenix by the Signal Service beginning on January 28, 1876, and Signal Service personnel continued to take observations until they transferred the station on the corner of Center and Washington Streets to the Weather Bureau on August 6, 1895. In the desert southwest, however, summer is the most undesirable time of the year. Q) Why can't I see the entire forecast on my computer screen without having to scroll to the right? Ms. Brazel and Mr. Balling’s research paper, “The Myth of Increasing Moisture Levels in Phoenix”, is also included in this Technical Memorandum.

The spring and fall months are generally dry, although precipitation in substantial amounts has fallen occasionally during every month of the year. The warmest time of the day is from 12:00 PM to 6:15 PM, with the hottest at 3:30 PM, at which time the temperature is above 81°F three days out of four, and above 74°F nine days out of ten. However, many scientists have shown that cities usually act to decrease moisture levels in the atmosphere. Further terms of use can be found at http://www.usairnet.com/terms.htm. Email the

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