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I have the following METAR from the FAA Aviation Weather Center (AWC) website for KCRP (Corpus Christi Airport):

 KCRP 260551Z AUTO A2935 RMK AO2 SLPNO 6//// 402610239 53014 PWINO

A few questions:

  1. How do we know what the altimeter setting is if the sea level pressure indicator is inoperative?

  2. What does 6//// mean?

  3. What does 402610239 53014 mean?

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I suggest changing the title, else this question is of relatively limited interest: the METAR message for KNGP has been already updated with new values.

How to set the altimeter when the "sea level pressure" information is not available?

  • ATC will be able to provide the information. When aerodrome QNH is not available, the Regional Pressure Setting is used ("safe" setting for the highest location of the region).

6////: Group 6RRRR, 3- and 6-hour precipitation amounts

  • 3- and 6-hour precipitation amounts are missing, sensor not operative or not reachable.

402610239: Group 4snTTTsnTTT, 24-hour max/min temperature in tenths degrees

  • Maximum temperature in the past 24 hours + 26.1 °C.
  • Minimum temperature in the past 24 hours + 23.9 °C.

53014: Group 5appp, hourly pressure tendency and and actual change in tenths hPa

  • Atmospheric pressure now higher than 3 hours ago. Decreasing or steady, then increasing; or increasing then increasing more rapidly.
  • Variation is 1.4 hPa

PWINO: Sensor status indicators (RVRNO, PWINO, PNO, FZRANO, TSNO, VISNO_LOC, CHINO_LOC)

  • Precipitation identifier information (rain or snow) not available.

See this decoder and this list of METAR abbreviations.

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