What is Alert?
ALERT systems are used around the world to provide real-time flood warning to local communities at risk from flooding threat. An ALERT system is characterized by its real-time nature, accomplished by the instantaneous transmission of weather events primarily by radio transmission, and to a lesser extent by satellite, telephone, and cell phone transmission. Changes in rainfall, stream, weather and lake levels throughout San Diego County are transmitted by radio to mountaintop repeaters, which in turn relay the transmission to our District Flood Warning office in Kearny Mesa. In Kearny Mesa, the radio signals are intercepted and also relayed by independent radio repeaters to the National Weather Service (NWS) in San Diego. This data is received by ALERT computers which check the data for validity, check against established warning criteria for that data, update any displayed maps, then place the data into a database. If any warning criteria are met, the computers will put out a visible,
