Legends Index
For additional details on Active Alerts/Severe Advisories from the National Weather Service, click here.
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Air Quality Index
Convectional Daily Outlook
Droughts Weekly Outlook
Fires Daily Outlook
Heat Index Layer
Humidity Global Layer
Infrared Satellite Layer
Lightning Icons
Precipitation 6-10 Day Outlook
Precipitation Radar
Severe Advisories
Storm Cells
Storm Reports
Temperatures 6-10 Day Outlook
Temperatures Global Layer
Tropical Icons and Outlook
Wind Chill Advisory Layer
Winds Current Conditions Layer
Air Quality Index
A number used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to become. As the AQI increases, an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects.
Android
Available worldwide, Refreshes every 15 minutes
IOS
Available worldwide // Refreshes every 15 minutes
Convectional Daily Outlook
Convective Daily Outlook consists of a graphic depiction of severe thunderstorm threats across the continental United States. The graphics display up to six different color categories to reflect the six likelihood of occurrences and/or increased severity of a severe weather event.
Android
Available in the USA only // Refreshes as needed
IOS
Available in the USA only // Refreshes as needed
Droughts Weekly Outlook
Droughts Weekly Outlook shows predicted trends for areas currently in drought, as well as areas where new droughts may develop.
Android
Available in the USA only // Refreshes weekly
IOS
Available in the USA only // Refreshes weekly
Fires Daily Outlook
The daily probability for occurrence of a new large fire and/or the daily potential for significant new growth on existing fires
Android
Available in the USA only // Refreshes daily
IOS
Available in the USA only // Refreshes daily
Heat Index Layer
Heat Index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. Heat Index is displayed as degrees Fahrenheit or Celsius.
Android
Available worldwide // Refreshes every 30 minutes
IOS
Available worldwide // Refreshes every 30 minutes
Humidity Global Layer
Humidity is displayed as a % of humidity (water vapor) present in the atmosphere.
Android
Available worldwide // Refreshes every 60 minutes
IOS
Available worldwide // Refreshes every 60 minutes
Infrared Satellite Layer
IR Satellite Imagery provides cloud density data. In simple terms, we can see how high cloud formations rise based on how cold IR imagery records them. The colder the cloud formation is, the higher it extends because temperature falls as we go higher. The colder the cloud the more likely it is to produce rain. The temperature structure of clouds also tells meteorologists how hard it may be raining and whether the storm may be producing severe weather.
Android
Available worldwide // Refreshes every 15 minutes in the USA, 2 hours for global
IOS
Available worldwide // Refreshes every 15 minutes in the USA, 2 hours for global
Lightning Icons
Cloud-to-ground lightning strikes in the last 5-15 minutes.
Android
Available worldwide // Refreshes every 5 minutes
IOS
Available worldwide // Refreshes every 5 minutes
Precipitation 6-10 Day Outlook
Precipitation outlook provides the probability (percent chance) that precipitation will occur in an area. The graphics represent the likelihood for the occurrence of a precipitation event from the current conditions. Areas less than "equal" have a reduced likelihood of a precipitation event taking place in the next 6 to 10 days.
Android
Available worldwide // Refreshes daily
IOS
Available worldwide // Refreshes daily
Precipitation Radar
Rain
Ice
Snow
Precipitation Radar shows the location of precipitation, its type (rain, snow, and ice) and its recent movement.
Android
Available worldwide, Refreshes every 2 minutes
IOS
Available in the US, Puerto Rico, Guam, Canada, Australia, South Korea, Northwestern Europe // Refreshes US every 2-min, all other locations 6-10 minutes
Severe Advisories
Precipitation Radar shows the location of precipitation, its type (rain, snow, and ice) and its recent movement.
Android
Available in the USA, Canada, Europe // Refreshes every 2 minutes
IOS
Available in the USA, Canada, Europe // Refreshes every 2 minutes
Storm Cells
Storm cell icons represent current behavior/observations of active storms.
Android
Available in the USA // Refreshes every 3 minutes
IOS
Available in the USA // Refreshes every 3 minutes
Storm Reports
Storm Reports are significant information from storm spotters, such as amateur radio operators, storm chasers, law enforcement officials, civil defense (now emergency management) personnel, firefighters, EMTs or public citizens, about severe weather conditions in their warning responsibility area. Those reports are received by local National Weather Service offices (WFOs), and they can be used to issue Severe Thunderstorm Warnings, Tornado Warnings, and other weather warnings/bulletins.
Android
Available in the USA // Refreshes every 15 minutes
IOS
Available in the USA // Refreshes every 15 minutes
Temperature 6-10 Day Outlook
Temperature outlook provides the probability (percent chance) that temps will either be hotter or colder in a specified area. Areas less than "equal" have a likelihood of experiencing cooler temperatures in the next 6 to 10 days.
Android
Available worldwide // Refreshes daily
IOS
Available worldwide // Refreshes daily
Temperature Global Layer
Current temperatures are displayed worldwide.
Android
Available worldwide // Refreshes every 60 minutes
IOS
Available worldwide // Refreshes every 60 minutes
Tropical Icons and Outlook
Current and projected data for tropical storms.
Android
Available worldwide // Refreshes every 1 to 6 hours
IOS
Available worldwide // Refreshes every 1 to 6 hours
Wind Chill Advisory Layer
Wind chill is how cold it actually feels on your skin when the wind is factored in. It may also be referred to as the "feels-like" temperature. Wind Chill Temperature is defined only for temperatures at or below 50°F and wind speeds above 3 mph.
Android
Available worldwide // Refreshes every 60 minutes
IOS
Available worldwide // Refreshes every 60 minutes
Wind Current Conditions Layer
Current winds are displayed worldwide either in MPH or KPH.
Android
Available worldwide // Refreshes every 60 minutes
IOS
Available worldwide // Refreshes every 60 minutes