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4.2.4.4  The United States does not report the lowest visibility in lieu of prevailing visibility.  The United States always reports prevailing visibility and does not report lowest visibility if the lowest visibility is different from prevailing visibility 
4.2.4.5  The United States does not use “NDV”, no direction variations can be given for visibility.  This difference is also applicable to Table A3.2, METAR and SPECI 
4.3.6.1  The United States reports RVR in increments of 100 feet up to 1,000 feet, increments of 200 feet from 1,000 feet to 3,000 feet, and increments of 500 feet above 3,000 feet to 6,000 feet. 
4.3.6.5b), 4.3.6.6  The United States reports RVR for a single designated runway in the METAR/SPECI. RVR tendency is not reported. This difference is also applicable to Table A3.2, METAR and SPECI. 
4.4  The following weather elements are augmented manually at designated automated stations observation sites: FC, TS, GR, GS, and VA. At selected airports, additional present weather elements may be provided. With the exception of volcanic ash, present weather is reported when prevailing visibility is less than 7 statute miles or considered operationally significant. Volcanic ash is always reported when observed. 
4.4.2.6  The practice with respect to the proximity indicator VC is between 5 to 10 statute miles from the point of observation with the exception of precipitation for which the VC indicates .0 to 10 statute miles from the point of observation. 
4.5.4  The United States reports only up to 3 layers at automated sites and up to 6 layers at manual sites. Cloud layer amounts are a summation of layers at or below a given level, utilizing cumulative cloud amount. In addition, at automated sites, which are unstaffed, cloud layers above 12,000 ft are not reported. At staffed automated sites, clouds above 12,000 ft may be augmented.  CAVOK and NSC are not used. In addition, the United States does not use “///” when cloud type can not be observed; “NCD” when no clouds are detected; or “//////” for CB or TCU when not detected by automated observing systems. In the United States the symbol “///”, when used in the cloud section of the METAR, refers to a mountain station where the layer is below the station level. This difference is also applicable to Table A3.2, METAR and SPECI. 
4.8  The United States has a Remarks Section that provides similar information. This difference is also applicable to Table A3.2, METAR and SPECI. 

4.8.1.4  Wind shear is not included in the METAR/SPECI code form in the U.S remarks. This difference is also applicable to Table A3.2, METAR and SPECI. 
4.8.1.5  Sea.surface temperature, the state of the sea and state of the runway are not provided in the METAR/SPECI code form in the U.S. remarks. This difference is also applicable to Table A3.2, METAR and SPECI. 
APPENDIX 4  Technical specifications related to aircraft observations and reports 
3.1.4  The United States MWOs do not issue special air reports. 
APPENDIX 5  Technical specifications related to forecasts 
1.2.2  Forecast visibility increments used consist of 1/4 mile from 0 (zero) to 1 mile, 1/2 mile from 1 to 2 miles, and 1 mile above 2 miles. Note: miles are statute miles. 
1.2.3  Practices require forecast of non.convective low.level wind shear within 2,000 feet of the ground in the Optional Group. The forecast consists of WS (wind shear); heights of the wind shear in hundreds of feet; and wind speed and direction above the wind shear height, using METAR and TAF coding regulations. 
1.2.4  The United States does not use CAVOK and NSC in the TAF.  This difference is also applicable to Table A5.1, Template for TAF. The non.application of the use of NSC also applies to App 5. 1.3.1 i) 
1.3.1 e)  Change groups and amendment criteria below 1/2 statute mile (800 meters) are not used. This difference is also applicable to Table A5.1, Template for TAF. 
1.3.1 j)  The 100.foot (30 meter) change group and amendment criterion is not used. This difference is also applicable to Table A5.1, Template for TAF. 
1.3.2  The United States does not use the change indicator “BECMG”. This difference is also applicable to Table A5.1, Template for TAF and to other subsequent sections including 1.3.3 and 1.3.4 where BECMG is referenced. 
1.4  The United States does not use “PROB 40” in the TAF. “PROB 30” will not be used in the first nine (9) hours of every TAF’s valid period, including amendments. This difference is also applicable to Table A5.1, Template for TAF. Note also that Military TAFs do not use the “PROB” groups. 
4.1 i)  Practice is not to include thunderstorms information in Area Forecasts. See difference filed for Part I 6.6 that the United States does not provide the GAMET but does provide an Area Forecast. 
　
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