AIRMET


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AIRMET

Information issued by a meteorological watch office concerning the occurrence, or expected occurrence, of specified en route weather phenomena that may affect the safety of low-level aircraft operations and was not already included in the forecast issued for low-level flights in the flight information region or subarea (ICAO). AIRMETs deal with weather of less severity than that covered by SIGMETs (significant meteorological information) or convective SIGMETs. AIRMETs cover moderate icing, moderate turbulence, sustained surface winds of 30 knots or more, widespread areas of ceiling less than 1000 ft (300 m) and/or visibility less than 3 miles (5 km), and extensive mountain obscurement.
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And again, in "Donelle", Airmet contrasts his partner's wit with tenderness:
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No, additional AIRMET information could be in the text.
COMPARING LPV AND ILS
However the computer modeling that was done nailed down a few of the hazards in much more detail than we usually get from the generalized tone of SIGMETs and AIRMETs. What is certain is all of Montana's mountain ranges were capped with orographic clouds and mountain wave activity, and were comprised of shallow but extensive convection due to a layer of instability between the surface and 12,000 feet.
WEATHER ACCIDENTS
Data feeds, such as from the Avidyne MLB700 broadcast weather receiver, may omit basic information that cannot be displayed, such as the altitudes of AIRMETs, making their horizontal extent less useful or even misleading.
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In the case of our departure from Manassas, an Airmet Zulu for icing is in effect from 2000 feet msl to 12,000 feet.
Risk and consequences: Personal aviation's substantial benefits come with potential costs we can't ignore. But we can take steps to eliminate the worst-case scenarios
The first tab is Adverse Conditions, with Conv SIG and AIRMET in bold identifying content.
DIY weather briefing
This is where you may find an Airmet covering your proposed route and time, including advisories for mountain obscuration (Airmet Sierra), icing (Airmet Zulu) and turbulence (Airmet Tango).
Flying around ice: your electronic flight bag likely has some great tools you can use to find icing, estimate its likelihood and avoid it
The day of my departure, however, Airmet Sierra was in effect and the mountains were obscured.
Climbing On Top: flying VFR over the top of a cloud deck and the IFR clearance "VFR on top" both have their value when conditions are right
A less urgent report than a PIREP, as an AIRMET is to a SIGMET
Technology gotchas
The pilot obtained a weather briefing at 9:20 AM, and was given an AIRMET for IFR and icing above 13,000 feet.
When things go wrong
This leaves AIRMETs. AIRMET Sierra describes IFR conditions and mountain obscuration.
FA swan song
But, an Airmet Zulu or freezing temperatures shouldn't prevent an IFR flight.
Cowboys and cowards

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