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SKYWARN is a volunteer programme of the United States National Weather Service (NWS) that trains citizens to identify and report severe weather conditions. While SKYWARN is not exclusively an amateur radio programme, ham radio operators make up a large and critically important portion of the spotter network because they can provide real-time reports from the field when other communication systems may be unreliable.
SKYWARN spotters have been a key part of the NWS warning process since the programme was established in the 1970s. Today, there are over 400,000 trained SKYWARN spotters across the United States, and amateur radio remains one of the primary means of relaying their reports.
Modern weather radar systems are powerful, but they have limitations. Radar can detect rotation within a storm, estimate precipitation intensity, and identify areas of concern — but it cannot confirm what is actually happening on the ground. A radar signature suggesting a tornado does not confirm a tornado is occurring, and conditions like hail size, wind damage, flooding, and visibility can only be assessed by a human observer at the scene.
SKYWARN spotters fill this gap. When trained observers report what they see — a funnel cloud, hail of a specific size, flooding over a roadway, or damaging winds — the NWS can issue or upgrade warnings with much greater confidence. These reports directly inform the warning decisions that protect lives.
The United States is divided into regions, each covered by a local NWS Weather Forecast Office. Each WFO manages the SKYWARN programme for its area, including training spotters, activating spotter networks during severe weather, and collecting reports.
When severe weather threatens, the local WFO issues a "SKYWARN activation," alerting trained spotters to begin monitoring conditions and reporting significant weather observations. Activations are typically announced through local SKYWARN nets on amateur radio, as well as through social media and other notification systems.
During a SKYWARN activation, reports flow through a structured chain:
In many areas, the NWS has a direct liaison at the local amateur radio SKYWARN net, or the net control station has a dedicated phone line to the WFO.
Amateur radio is particularly valuable to SKYWARN for several reasons:
Real-time reporting. A spotter can observe severe weather and report it within seconds over the radio. Phone lines to the NWS can be busy during active weather, and web-based reporting requires internet access. Radio is immediate.
Reliability. Severe storms often knock out power and cellular service. A battery-powered amateur radio station continues to function.
Network structure. Amateur radio nets provide an organized, disciplined way to collect reports from many spotters simultaneously. The net control station manages the flow of information, prioritizes critical reports, and ensures nothing is missed.
Area coverage. Amateur radio operators are spread throughout communities. During severe weather, they can provide observations from many locations simultaneously, giving the NWS a detailed picture of conditions across a wide area.
Most local SKYWARN operations use a designated VHF/UHF repeater for their net. When the net is activated:
Some areas also maintain HF SKYWARN nets for wider area coverage, and many now supplement radio reports with digital methods.
SKYWARN spotters are trained to report specific weather phenomena. Reports should be based on direct observation, not assumption. Key reportable conditions include:
The NWS provides free SKYWARN spotter training, typically offered annually by each local WFO. Training is available both in-person and online. The basic course covers:
The training takes approximately two hours and requires no prior weather knowledge. There is no exam or certification — attending the training qualifies you as a SKYWARN spotter.
Some WFOs offer advanced spotter training covering topics like:
A critical component of SKYWARN training is personal safety. Key safety principles include:
While SKYWARN is a US NWS programme, several other countries have similar volunteer weather observer networks: