NWS radar overlays for 24-168 hours represent a total ending at 12UTC on or before the indicated gage-data date. NWS radar overlays for 1-12 hours are generated once an hour at the end of the hour. The average value from all these simulations are then recorded. Precipitation gage data retrieved from NWISWeb: Novem17:01 EST. 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. 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 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. No quality control has been performed on this data. To offer a companion measurement to the official observations at KPHX, the Phoenix Rainfall Index (PRI) was been created. Radar Forecasts Rivers and Lakes Climate and Past Weather Local Programs This is an automatically generated product providing a summary of rain gauge reports. 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. ![]() All rights reserved.Phoenix, Arizona is a vast, sprawling metropolis which covers an area of nearly 2000 sq-mi. Some locations stretch into Sonora, Mexico. Data close to the border is also available on the Santa Cruz County rain totals website. CoCoRaHS stands for Community Collaborative Rain, Hail, and Snow Network. Like, this network gathers data from volunteers. Many neighborhoods and towns in and around the city of Tucson have multiple sensors. These sensors measure rain totals with some measuring how much water is flowing in area washes. Plus every hour, this Precipitation Report is updated. Pima County Regional Flood Control ALERT System is a network of weather and streamflow sensors in the Tucson metropolitan area. This e-mail will report how much rain fell in your backyard by triangulating the rain reports from your neighbors. You can also sign up for the Rain Mapper e-mail. ![]() To see how much rain fell in your area, simply zoom in and out on the Google map for rain total reports nearby. is a network of your neighbors that report rain totals in their backyards. You can also sign up to report rain totals. ![]() , Pima County Regional Flood Control ALERT System, CoCoRaHS, and the Santa Cruz County rain totals website are important to assessing rain totals in your neighborhood.
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