Upper Air Analysis

850 mb maps

• Dewpoint depressions < 10 degrees Celsius suggest sufficient moisture for precipitation.  Can also be used to infer temperature advection

• Short-waves indicate areas of upward motion

• Ridges are associated with fair weather and warmer temperatures
• Troughs are associated with stormy weather and cooler temperatures
• Vorticity may be used to determine regions of upward (+) or downward (-) motion

• Jet stream is used to identify areas of convergence and divergence at the surface

Upper Air Links

• 850mb 12z Dec 12
• 850mb 00z Dec 13
• 500mb 12z Dec 12
• 500mb 00z Dec 13