What is the meaning of "SLP125" in a METAR report?

The term "SLP125" in a METAR report refers to the sea level pressure, represented in tenths of millibars. To decode "SLP125," you start by understanding that "125" means 125 tenths of a millibar.

To convert this value to millibars, you divide by 10. Therefore, 125 tenths of a millibar is equal to 12.5 millibars. When added to the baseline of 1000 mb (the typical pressure at sea level), you get a total sea level pressure of 1012.5 mb.

Thus, the correct interpretation of "SLP125" indicates that the sea level pressure is 1012.5 mb. This understanding of how sea level pressure is formatted and calculated is crucial for accurately reading METAR reports and understanding atmospheric conditions.