The average value from all these simulations are then recorded. 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. Here are today’s rainfall totals, according to the Maricopa County Flood Control District, as of 12:45 p.m. 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.

24-hour rainfall total at the FCDMC gauge nearest the Tiger Wash alluvial. 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'. Here is a look at how much measurable rain has fallen across the Valley in the last 24 hours, according to the Maricopa County Flood Control District. Maricopa County (FCDMC) operates three ALERT rain gauges within the watershed. 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. 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.

Daily Storm Summary provides the summary of 24 hours precipitation, daily maximum. 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. Use the Info Menu (Links Section) to open the Daily Storm Summary table. 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. Phoenix, Arizona is a vast, sprawling metropolis which covers an area of nearly 2000 sq-mi.

24 hour rainfall totals maricopa county