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:

251118/0200

251118/0200: year=2025; month=11 (November); day=18; 0000=00:00 UTC

Last update : 29 December 2022

ATTENTION Downloading of any data from this server implies that you accept that the use of this data is only for personal, research or educational purposes. Do not use for flight planning purposes. UQAM declines any responsibility for the usage of these data.

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.