PRESRR
Indicates that the atmospheric pressure has been rising at a rate of at least 0.06 inches of mercury (2.03 hPa) per hour at the time of observation. Rapidly rising pressure often follows the passage of a cold front or low pressure system and generally indicates improving weather conditions.
RMK PRESRR
RMK AO2 PRESRR
RMK PRESRR SLP031
PRESRR stands for "Pressure Rising Rapidly" in the remarks section of a METAR report. Indicates that the atmospheric pressure has been rising at a rate of at least 0.06 inches of mercury (2.03 hPa) per hour at the time of observation. Rapidly rising pressure often follows the passage of a cold front or low pressure system and generally indicates improving weather conditions.
PRESRR appears in the remarks (RMK) section at the end of a METAR observation. The remarks section follows the main body of the METAR and provides additional details about the observation that don't fit into the standard coded format.
Here is an example: "RMK PRESRR". This appears in the remarks section and indicates pressure rising rapidly information as part of the weather observation.