Remember, AIRMET Sierra’s definition is: ceilings less than 1000 feet and/or visibility less than 3 miles for more than 50% of the area. The AIRMET and the FA will be replaced once the new Graphical Forecast for Aviation (GFA) and the International Civil Aviation Organization (ICAO) General Aviation Meteorological Information (GAMET) become operational. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. They are: An abbreviated forecast of actual and possible adverse weather conditions along a given flight route. Issued when conditions reach a point where the safety of all nearby aircraft is believed to be at risk. The height of clouds in the group applies to average sea level.Icing (except for that occurring in cumulonimbus (CB) or towering cumulus (TCU) clouds and for severe icing for which a SIGMET message has already been issued) including its vertical range, area and projected time of occurrenceTurbulence (except for that occurring in cumulonimbus (CB) or towering cumulus (TCU) clouds and for severe icing for which a SIGMET message has already been issued) including the level, location and the projected time of occurrenceMountain wave (except for severe mountain wave for which a SIGMET message has already been issued) including the level, location and the projected time of occurrenceSIGMET message applicable to the FIR/CTA concerned or a sub-area thereof, for which the area forecast is validGroup applicable when there are no hazardous phenomena projected for Section I and no SIGMET message has been issued Pressure centres and fronts and their expected movements and developments, including the projected time of occurrenceSurface wind (prevailing direction, speed and gusts), including the time and location of occurrenceUpper wind direction and speed and temperature for the following altitudes: 1000, 2000, 3300, 5000 and 10000ft above mean sea level (AMSL)Cloud information not included in Section I giving the type, height of base and top above mean sea level (AMSL)Height indication of 0°C levels above mean sea level if lower than the top of the airspace for which the forecast was suppliedSea-surface temperature and state of the sea if required by regional air navigation agreement, including the projected time of occurrence
AIRMET is shorthand for “Airmen’s Meteorological Information.”. In this AIRMET for IFR conditions, it isn’t very accurate anymore. Dust storms and/or sand storms lowering visibilities to less thanthree (3) miles 4. SIGMETs are issued (for the lower 48 states and adjacent coastal waters) for the following weather-impacted reasons: 1. Compared to SIGMETs, AIRMETs cover less severe weather: moderate turbulence and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility.

A SIGMET advises of weather, other than convective activity, that is potentially hazardous to all aircraft. Severe or Extreme Turbulence 3. Did You Know? Severe Icing 2. GAMET stands for General Aviation Meteorological Information (forecasts) Awiacja.imgw.pl jest pogodowym serwisem informacyjnymAbbreviation for forecast and the number of region (a part of FIR) it refers to.Abbreviation for meteorological office that issued a forecastDay of the month and the hour when forecast was issuedICAO indicator for flight information region (or its part) to which the forecast refersGroups indicating the day and the validity period of the forecast in UTCICAO indicator for meteorological office which issued a forecast ended with a hyphenICAO indicator and the name of FIR or the name of its part to which the forecast refers, including its upper boundary (along flight levels)Widespread surface wind exceeding 15 m/s (30kt) including the projected time of occurrenceWidespread surface visibility below 5000m including the weather phenomena causing the reduction in visibility and the projected time of occurrenceSignificant weather conditions encompassing thunderstorms with or without hail, heavy duststorms and sandstorms, volcanic ashes, including the projected time of occurrenceMountain obscuration (low clouds/fogs), including the projected time of occurrenceWidespread areas of broken or overcast cloud with height of base less than 1000 ft (300m) above ground level (AGL) and/or any occurrence of cumulonimbus (CB) or towering cumulus (TCU) clouds, including the projected time of occurrence.

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