Jetstream
Courtesy The Weather Underground, Inc:
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. 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.
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