MeteoUp

1. Theory Figure 1 is the summary of the Bergen school cyclone model, which shows three stages of cyclone development. Figure 2 shows the vertical cross section of  an open wave cyclone.  Figure 1 Figure 2 2. Record January15th, 11UTC: cirrus clouds → warm front is coming  January15th, 12UTC, cirrostratus clouds January16th, 09UTC, drizzles → We were already in the warm air January16th, 16UTC, cumulus clouds January16th, 23UTC, stratus clouds → cold front just passed January17th, 09UTC, clear sky 3. Additional materials at selected time 15th, January, 12UTC: We can find the slope of warm front is very small from the satellite image below.  16th, January, 18UTC: Surface temperature change at Uppsala:

Today we have a very strong cyclone in northern Scandinavia and anticyclone in central Europe. They create a large pressure gradient between them. Therefore, we can experience large surface winds!