Group 7: Present Weather

METEOROLOGY FLIGHT PLANNING

CHAPTER ONE

METAR KNPA 082255Z 27004KT 7/8SM R04/4500FT DZ FG SCT000 BKN011 OVC380

19/18 A2997 RMK VIS1/2V1 CIG009V013 FG SCT000 BKN TOPS 027 SLP149

Figure 1-9 RVR in METAR

RVR is encoded with an "R" indicating runway, followed by a 2-digit group denoting runway

number, and may be followed by an "R," "L," or "C," denoting right, left, or center runway. Next

is a forward slash followed by the constant reportable value in four digits and ending with the

letters "FT" for feet.

If RVR is varying, the coding will be the same as above, except the two reportable values will be

separated by a "V." If RVR is less than its lowest reportable value, the 4-digit value will be

preceded with an "M" (for Minus), and if greater than the highest reportable value, it is preceded

with a "P" (for Plus).

Examples:

R33/1800FT -- Runway 33 visual range 1800 feet.

R17R/3500FT -- Runway 17 Right visual range 3500 feet.

R09/1000V4000FT -- Runway 09 visual range 1000 feet variable to 4000 feet.

R28L/P6000FT -- Runway 28 Left visual range greater than 6000 feet.

R02/M0800FT -- Runway 02 visual range less than 800 feet.

NOTE:

RVR is not reported from USN/USMC stations. It will, however,

be disseminated locally to arriving and departing aircraft.

Group 7: Present Weather

Present weather includes precipitation, well-developed dust or sand swirls, squalls, tornadic

activity, sandstorms, and duststorms. It may be evaluated instrumentally, manually, or through a

combination of methods. The present weather codes as seen below in Figures 1-10 and 1-11 are

used throughout meteorology with one exceptionthe Radar Summary Chartwhich has its own

codes.

METAR KNPA 082255Z 27004KT 7/8SM R04/4500FT DZ FG SCT000 BKN011 OVC380

19/18 A2997 RMK VIS1/2V1 CIG009V013 FG SCT000 BKN TOPS 027 SLP149

Figure 1-10 Present Weather in METAR

AVIATION ROUTINE WEATHER REPORTS AND TERMINAL AERODROME

FORECASTS 1-9