PROGRAMA DE INTERVENCIÓN NEUROPSICOLÓGICA

Examples of RVR reports are provided in Figure 6.4.

6.6.1. RVR Not Available (RVRNO). Indicates touchdown RVR for the in-use runway is not available (i.e., equipment failure) where RVR data are required to be reported for that runway and transmitted longline in place of the locally disseminated RVR value when a unit does not have a ten minute RVR average readout capability.

Figure 6.3. RVR Code Breakdown. Note: US stations append FT to end of reportable value(s).

Figure 6.4. Examples of RVR. (Note: CONUS stations append FT to end of reportable values.) Reportable Contraction Definition

R Runway number indicator

D_RD_R/ Runway number. Parallel runways will be distinguished by appending R for right, L for left, and C for center as appropriate. A solidus (/) separates the runway number from the reportable value and is not used with RVRNO.

V_RV_RV_RV_R The touchdown RVR in meters using reportable values in tables 3.2 or 3.3. Use a P to indicate a value greater than the highest reportable increment in both feet and meters, i.e., P6000FT (feet), P1830 (meters) or M to indicate a value below the lowest

reportable increment for the line in use for both feet and meters, i.e., 250 foot baseline; 600 feet/180 meters, 500 foot baseline; 1000 feet/300 meters.

V_NV_NV_NV_NVV_XV_XV_XV_X Variable RVR shall be coded using V_NV_NV_NV_N as the lowest reportable value, V separates the lowest and highest reportable values, and V_XV_XV_XV_X is the highest reportable value. See tables 3.2 and 3.3 for reportable values.

RVRNO Entered in place of appropriate V_RV_RV_R values when touchdown RVR data is not available and transmitted longline in place of the locally disseminated RVR value when a unit does not have a ten minute RVR average readout capability.

R27/M0180 Runway 27 touchdown RVR is less than 180 meters R27/M0600FT Runway 27 touchdown RVR is less than 600 feet R09/1000FT Runway 09 touchdown RVR is 1000 feet

R27/1200FT Runway 27 touchdown RVR is 1200 feet R27/1200 Runway 27 touchdown RVR is 1200 meters R 2 7 /

1000V2000FT

Runway 27 touchdown RVR is varying between 1000 and 2000 feet R27/0300V0910 Runway 27 touchdown RVR is varying between 300 and 910 meters RVRNO Touchdown RVR not available/or no ten minute RVR average readout

Chapter 7

WEATHER AND OBSCURATIONS

7.1. General Information. This chapter contains instructions on coding and reporting precipitation and identifying atmospheric phenomena. It includes methods used to measure precipitation amounts and depth and methods of determining precipitation type and intensity. This chapter also contains definitions of present weather parameters and common descriptor/weather phenomena combinations.

7.1.1. Precipitation Evaluation. Code and report precipitation in column 5 only when it is occurring at the point(s) of observation. Precipitation not occurring at the point(s) of observation, but observed to be occurring £ 10 statute miles/16 kilometers of the point(s) of observation (>0 statute miles/>0 meters to £ 10 statute miles/16 kilometers), will be encoded in column 5 as showers in the vicinity (VCSH). For example, if a rainshower is observed 2 statute miles from the point(s) of observation, but no precipitation is actually occurring at the point(s) of observation, the rainshower will be encoded as VCSH in column 5.

7.1.2. Significant Changes. A significant change in precipitation reporting conditions (as specified in Chapter 2 SPECI and LOCAL criteria) involves the occurrence (beginning and ending) of hail, ice pellets, ice pellet shower, freezing rain, and freezing drizzle, to include changes in their intensity (i.e., except hail). Normally, the beginning and ending of other types must also be reported. However, a change from one type to another (e.g., rain changes to snow) and the beginning or ending of one type while another is in progress (e.g., rain changes to rain and snow) need not be reported as a significant change.

7.1.2.1. Snow Increasing Rapidly. Report a snow-increasing-rapidly remark in the next METAR when the snow depth increases by 1 inch or more in the past hour. Code the remark using the for- mat SNINCR_ the inches of snow per hour/the inches of snow on the ground, where SNINCR is the snow-increasing-rapidly remark, inches of snow per hour is the snow depth increase in the past hour, and the inches of snow on the ground is the total depth of snow on the ground at the time of observation. The depth increase in the past hour and the total depth on the ground will be sepa- rated by a solidus (/). For example, a snow increase of 2 inches in the past hour with a total snow depth on the ground of 10 inches would be coded as SNINCR 2/10.

7.1.3. Precipitation Character . Determine the type and character of precipitation primarily on the basis of experience, with consideration given to knowledge of the synoptic situation. The classifica- tion given most types of precipitation is based primarily on the cloud form (stratiform versus cumuli- form) with which it is associated, and indicative of whether or not the precipitation is falling at a fairly continuous or rapid rate. For reporting purposes, only the predominant character is determined for a specific type. For example, if both continuous and showery snow is falling and the showers appear to be predominant, only the showery character is reported. This condition is common to cumulonimbus embedded in nimbostratus and with occluded fronts.

7.1.3.1. Continuous. Intensity changes gradually, if at all. Continuous and intermittent rain, freez- ing rain, snow, and ice pellets are normally associated with nimbostratus and altostratus, but may also occur with stratocumulus and altocumulus (rarely). Drizzle, freezing drizzle, and snow grains are associated with stratus clouds. Ice crystals are associated with cirriform-type clouds or clear skies (common primarily to polar regions at very low temperatures), and the character of fall is generally continuous.

7.1.3.2. Intermittent. Intensity changes gradually, if at all, but precipitation stops and starts at least once within the hour preceding the observation.

7.1.3.3. Showery. Precipitation changes intensity or starts and stops abruptly. Showers fall exclu- sively from cumuliform clouds. Rain showers, snow showers, and ice pellet showers are associ- ated with cumuliform-type clouds such as cumulonimbus and towering cumulus. Hail falls exclusively as showers, and snow pellets almost always fall as showers.

7.1.4. Present Weather Order of Entry. When reporting a combination of present weather, obscu- ration(s), and other weather phenomena, construct w’w’ groups using the order of entry presented in

Figure 7.1.

Figure 7.1. Present Weather Order of Entry.

7.1.4.1. Order of Entry Examples. The occurrence of a thunderstorm, moderate rainshower, light snowshower, fog, haze, and smoke would be coded TSRASN FG HZ. The code entry for smoke (FU) is not reported because of the three-w’w’ group limitation. The occurrence of a funnel cloud, thunderstorm, moderate rainshower, light drizzle, squall, haze, and mist would be coded FC TSRADZ SQ. In this example, the code entries for haze (HZ) and mist (BR) are not reported because of the three-w’w’ group limitation.

7.2. Present Weather (w’w’) Group Code. Construct w’w’ group(s) by considering Figure 7.2. col-