![]() The average value from all these simulations are then recorded. If you have further questions or comments about the GHCN data or the Climate Data Online interface, you can send an email to NOAA NCEI at or call them at 1-82. With all available gages within 40 miles of Downtown Phoenix, 30 gages are randomly selected and their average and percent with measurable rain are computed. Searching by zip code will yield no results if there is no weather station within that zip code, but you can easily expand your search to a city or county. To generate the averages, a Monte Carlo simulation is used. The most common error will be light precip amounts at individual gages when no rain actually occurred. Also, please be aware that the rainfall data are only passed through minimal quality control mechanisms. When this happens it is reflective of either a very light or very isolated precipitation event. Coupled with mathematical rounding, it is very likely there will be days when precipitation falls across the PMA yet the average rainfall is 0.00". Therefore, any precipitation less than 1 mm/0.04" will not be measured by the rain gages. The FCD rain gages measure precipitation in millimeters (increments of 0.04"). The data is current as of June 30, 2011). ![]() The PRI, based on rain observed within 40 miles of Downtown Phoenix from the Maricopa County Flood Control District's network of ALERT rain gauges across the PMA, provides an average rainfall amount and what percent of gages measured rain. Rainfall Data (NovaStar.zip) (DSS file 3.9 MB updated -right click to download file) Data is in inches, is provisional and subject to revision. To offer a companion measurement to the official observations at KPHX, the Phoenix Rainfall Index (PRI) was been created. This is especially true during the monsoon. While KPHX did a good job of reprenting rainfall of Phoenix when it was smaller, with the vast sprawl of the area now there are times where portions of the PMA receive rain while other, including KPHX, do not. Since 1933, it has resided at Phoenix Sky Harbor International Airport (KPHX). Historically, the official rain gauge for the Phoenix Metropolitan Area (PMA) has been situated near the center of the city. To learn more about CoCoRaHS or to view the rainfall information, please go to Arizona is a vast, sprawling metropolis which covers an area of nearly 2000 sq-mi. Thus, a 10-inch snowfall that melts to produce one inch of liquid. Note that snowfall totals are reported as the amount of liquid water they produce upon melting. Areas shown in dark blue received eight inches or more of precipitation that fell as either rain or snow. A wide variety of individuals and organizations use the data, which includes the National Weather Service, emergency managers, engineers, etc. The darker the color on the map, the higher the precipitation for the month. The rain gauges are checked Monday - Friday and the information is then entered into the CoCoRaHS website. In September 2010, the Stormwater Division installed several rain gauges to help track rainfall throughout the city limits of Valdosta, which today include the following: ![]() CoCoRaHS is a unique, non-profit, community-based network of volunteers that work together to measure and map precipitation throughout all fifty states. The City of Valdosta is a proud partner of the Community Collaborative Rain, Hail and Snow (CoCoRaHS) Network.
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