Map Data

Radar (Precipitation)
Past Radar
Radar mosaic depicting areas of precipitation from a few hours ago until Now. Coverage includes North America, Alaska, Hawaii, Western Europe, Australia, Mexico and the Caribbean. Radar data for Canada is provided by Environment Canada. Radar data for Australia is provided by The Australian Bureau of Meteorology.

Future Radar
The state of the art future radar consists of two approaches: 1 hr: Relies entirely on the advection approach (projecting past movement forward) and offers a minute-by-minute projection of the radar that depicts direction and speed. 5 hr: Blends both the advection technique with a numerical model and offers a projection of radar in 15 minute increments depicting intensity, speed and direction.

Single-Site Radar
Near- Real time level 2 NEXRAD Radar and TDWR (FAA Terminal Doppler Weather Radar) including Reflectivity and Radial Velocity. Reflectivity is an indication of rain in the area at various elevations (tilts) in the atmosphere. Velocity will detect motion of the moving storm. In velocity images, red colors indicate wind moving away from the radar while green colors represent wind moving toward the radar.   Icons for radar sites across the US and Canada are displayed. Click one of the icons to begin viewing the data for that radar site. Radar data for Canada is provided by Environment Canada. 

Global Radar
A new experimental radar layer has been added that has worldwide coverage. It combines existing radar data where data is available and fills in the gaps with computer models of precipitation.

Precipitation for North America, Alaska, Hawaii, Western Europe, Australia, Mexico and the Caribbean. Cloud Cover for North America.

Satellite (Clouds)
Global Cloud Cover.

Road Weather
Current potential driving hazards for the continental United States and portions of Canada as a result of significant wind, rain, fog, water puddling, ice and snow. The most threatening hazard type is shown based on the most recent weather observations, radar scans and model simulation. This is meant for planning purposes only.

 Wind speed
Wind Speed observations for continental United States, southern Canada and parts of Mexico.

Global temperature observations.

Water Temperature
Water Temps for the continental United States, southern Canada and parts of Mexico.

Snow Cover
Snow cover depth for the continental United States
Storm Tracks
Recent storm activity for the continental United States by category: tornadic, high winds, hail and strong storms. A cone indicates direction and how far the storm will travel in 60 minutes. Tap the cone to see additional advanced details about the storm.

Lightning will display in a 100 mile area around your selected location. (limited to the Continental United States) Lightning will not be visible if you zoom in to street level. To see Lightning in another area, simply switch locations. You can do this easily by using a tap and hold on the map on a location you wish to view.

Weather Stations
A network of Airport, Buoy and 140,000+ Personal Weather Stations (PWS) in your neighborhood that measure weather conditions in real-time. PWS data provided by Weather Underground.

Current wind flow at the Surface or Jetstream level. The speed of the moving arrows is proportional to the actual wind speed. The color of the arrows represents the air temperature. This is useful in finding low and high-pressure centers and convergence areas such as cold fronts.

Boundaries that separate different air masses depicted as colored lines and symbols. 
Blue lines- Cold Front
Red lines-Warm Front
Purple lines- Occluded Front
Brown dashed lines- Trough
Black lines- Squall Line
Red/blue lines-Stationary Front
Gold Lines-Dry Line

Severe Outlooks
The severe forecast for the Continental United states for the next 3 days, depicting the overall severe weather threat. The following categories are represented: TSTM: general or non-severe thunderstorms, MRGL: marginal risk of severe thunderstorms, SLGT: slight risk of organized, isolated severe thunderstorms, ENH: an area of greater than Slight risk of severe storms with varying levels of intensity, MDT: Widespread severe storms likely, HIGH: Widespread severe storms expected and particularly intense.

Tropical Tracks
Recent tropical depression, tropical storm and hurricane activity showing direction and strength. Tap icons to see strength, speed, direction, date and time. Tropical track data provided by the NHC and JTWC.

Tropical Model Tracks
See the Predicted paths of a Tropical System from various forecast models.

Earthquake activity for the continental United States. Tap icon to see magnitude, region, date and time.

 Saved Locations
Earthquake activity for the continental United States. Tap icon to see magnitude, region, date and time. 

US National Weather Service Alerts and Canadian Alerts (from Environment Canada) for various categories viewed on the map. Tap an alert on the map to view more details.

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