Analysis / Upper-Air / North America

Upper-left: temperature in deg C
Lower-left: dewpoint in deg C
Upper-right: abbreviated geopotential height (this is the last three digits of the height value). If below 500 hPa, value is in meters, otherwise it is in dam.
Wind barb: wind speed in knots and wind direction

Black solid lines: geopotential height each 6 dam analyzed with Barnes algorithm from upper-air observations and first guess model data
Filled color contours with dashed lines: temperature each 4 deg C analyzed with Barnes algorithm from upper-air observations and first guess model data

Decoding time stamp example:

251220/1000

251220/1000: year=2025; month=12 (December); day=20; 0000=00:00 UTC

Last update : 29 December 2022

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Many of these pages made possible by data and software (GEMPAK, McIDAS, LDM) from the Unidata Program. Unidata is sponsored by the National Science Foundation.