Maps - Current

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Temperature

• A color-filled contour map showing current temperature. The key below the image shows the corresponding temperature value for each color. This map can be double sized and animated.

Heat Index

• A color-filled contour map showing current heat index. Heat index is the apparent temperature considering both the temperature and relative humidity. The key below the image shows the corresponding heat index for each color. This map can be double sized and animated.

Wind Chill

• A color-filled contour map showing the current wind chill. Wind chill is the apparent temperature considering both the temperature and the wind speed. The key below the image shows the corresponding wind chill for each color. This map can be double sized and animated.

Humidity

• A color-filled contour map showing the current relative humidity. Relative humidity is the ratio of water vapor contained in the air to the maximum amount of water vapor that can be contained in the air at the current temperature. The key below the image shows the corresponding relative humidity for each color. This map can be double sized and animated.

Radar Map

• A radar map showing the current precipitation data for the United States. This map can be double sized and animated.

Dew Point

• A color-filled contour map showing the current dew point. Dew point is the temperature to which the air needs to be cooled in order for the relative humidity to reach 100 % (when a cloud would form). The key below the image shows the corresponding dew points for each color. This map can be double sized and animated.

Wind

• A color-filled contour map showing current wind speed. Wind vector arrows are also displayed to show the wind direction. The key below the image shows the corresponding wind speed for each color. This map can be double sized and animated.

Satellite

• The current infrared satellite image for the United States. Infrared satellite images indicate the temperature of cloud tops. The cooler the clouds, the brighter the color on the map. Since air temperature generally decreases with increasing altitude, the cooler (brighter) the clouds, the higher the clouds. Unlike the visible satellite image, infrared satellites work at night. This map can be double sized and animated.

Fronts

• This map shows the current radar, fronts positions, and areas of high and low pressure for the United States. Blue fronts are cold fronts, red fronts are warm fronts, alternating red and blue fronts are stationary fronts, and purple fronts are occluded fronts. Front positions are updated every 3 hours. This map can be double sized and animated.

Snow Depth

• A color-filled contour map of the current snow depths across the United States. The key below the map shows the corresponding snow depths for each color. The data is taken from a U.S. Air Force data set that is updated once per day at about 8pm EST. The data appears to have underestimation errors in Michigan's Upper Penninsula. This map can be double sized and animated.

Jet Stream

• A color-filled contour map of the wind speed where the atmospheric pressure is 300 hPa. Arrows showing the direction the wind is blowing at that level are overlaid. A pressure of 300 hPa corresponds to an altitude of approximately 8000 - 10000 meters above ground--the altitude where the jet stream is typically found. The data shown is the 6-hour forecast from the AVN computer model, which is run twice daily at 00 and 12 GMT by the National Center for Environmental Prediction (NCEP). The jet stream images are updated twice per day, at approximately noon and midnight EST. This map can be double sized and animated.

Flight Rules

• A map depicting the the flight conditions at each airport that reported in the past 2 hours across the United States. This map can be double sized and animated.
  • VFR = Visual Flight Rules (visibility greater than 5nm and ceiling greater than 3,000ft AGL)
  • MVFR = Marginal Visual Flight Rules (visibility 3nm to 5nm and/or ceiling 1,000ft to 3,000ft AGL)
  • IFR = Instrument Flight Rules (visibility less than 3nmi and/or ceiling less than 1,000ft AGL)

See Also:

• Weather forecast maps
• Aviation maps
• Model maps
• Severe weather maps