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For an authority to issue an AIRMET, applicable conditions must be widespread. "Widespread" means that the applicable area covers at least 3000 square miles. Because conditions across the forecast period can move across the area, it is possible that only a small portion of the area is affected at
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any time. AIRMETs are routinely issued for six-hour periods beginning at 0145Z during
Daylight Saving Time and at 0245Z during Standard Time. AIRMETS are also amended as necessary due to changing weather conditions or issuance/cancellation of a SIGMET.
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Most AIRMET dissemination is done graphically now, but computer systems use a text-based AIRMET, which is identical in structure to a SIGMET, with the only difference being that the "SIGMET" identifier in the
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and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility. Today, according to the advancement of technology in civil aviation, the AIRMET is sent as
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137:. AIRMETs are valid for six hours. NOTE: The definition has changed and no longer says "light aircraft"; AIRMETs are intended for
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less than 1000 feet and/or visibility less than 3 miles affecting over 50% of the area at one time; extensive mountain obscuration
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101:, is a concise description of weather phenomena that are occurring or may occur (forecast) along an air route that may affect
165:(Turbulence) moderate turbulence, sustained surface winds of 30 knots or greater, and/or non convective low−level wind shear.
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316:. ZHU training. Aviation Weather Center, Kansas City, Missouri: National Weather Service.
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328:. Advisory Circular. Aviation Weather Services: FAA. AC 00-45G. Archived from
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234:"IWXXM Amendment (ICAO Meteorological Information Exchange Model)"
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304:. Ch 7 "Safety of Flight", Section "Meteorology". Archived from
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171:(Icing) Moderate icing and provides freezing level heights.
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is replaced by the three type identifiers listed above.
340:. Select the G-AIRMET checkbox for "Graphical AIRMET".
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Graphical representation of AIRMETs can be found at:
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There are three types of AIRMET, all identified by a
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109:, AIRMETs cover less severe weather: moderate
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148:letter: S (Sierra), T (Tango), and Z (Zulu).
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272:"Pilot's Handbook of Aeronautical Knowledge"
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238:CATC Robex and Statics Conferences - 2024
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326:Regulatory and Guidance Library (RGL)
298:"FAA Aeronautical Information Manual"
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133:facilities, and are referred to as
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232:; Entezari, Mojtaba (March 2024).
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274:. Federal Aviation Administration
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16:Moderate flight weather advisory.
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419:Weather warnings and advisories
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155:(Mountain obscuration or IFR)
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338:AWC - Aviation Weather Center
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125:AIRMETs are broadcast on the
367:. You can help Knowledge by
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260:Chapter 7. Safety of Flight
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180:Dissemination And Structure
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186:SIGMET § Structure
363:-related article is a
250:ICAO Annex 3 Chapter 7
424:Aviation publications
414:Aviation meteorology
105:safety. Compared to
314:"What is an AIRMET"
135:Weather Advisories
22:Aviation briefings
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332:on March 1, 2013.
308:on July 26, 2012.
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369:expanding it
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330:the original
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278:17 September
276:. Retrieved
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163:AIRMET TANGO
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169:AIRMET ZULU
408:Categories
216:References
193:First Line
184:See also:
141:aircraft.
111:turbulence
361:aviation
322:"AIRMET"
199:See also
157:ceilings
146:phonetic
103:aircraft
117:model.
107:SIGMETs
205:SIGMET
95:AIRMET
50:SIGMET
30:AIRMET
359:This
210:PIREP
121:Types
115:IWXXM
97:, or
45:PIREP
40:NOTAM
35:METAR
365:stub
280:2019
127:ATIS
302:FAA
139:all
131:ATC
129:at
93:An
55:TAF
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