Distribution time for Aviation Routine Weather Report
METAR, Every hour/SPECI for significant changes
Valid Period for Aviation Routine Weather Report
Current conditions, METAR
What does the Aviation Routine Weather Report cover?
Compilation of current weather at a specific location. Covers temp, dew point, cloud cover/obscuration ad winds. METAR
Abbreviation for pilot weather report?
Distribution time for pilot weather report?
No set time UA-routine, UUA-Emergency
Valid period for PIREP
Current weather conditions
What does a PIREP cover?
Current conditions in the air. Visibility, wind, turbulence, icing, and clouds.
Abbreviation for Radar Storm Detection/Weather Reports?
When is are Radar Storm Detection/Weather Reports distributed?
when needed. Radar Storm Detection/Weather Reports
What is the valid period for Radar Storm Detection/Weather Reports
current conditions. SD/RAREP
What does the Radar Storm Detection/Weather Reports cover?
Type, intensity, and location of echo top of precip.
Abbreviation for Area Forecast?
Distribution time for Area Forecast?
3 times daily. FA
How long are FA's valid for?
18 hours, area forecast
What does an FA cover?
Clouds, general weather conditions and Visual Meteorlogical Conditions (VMC) over a large area covering several states.
What is the abbreviation for the Terminal Aerodrome Forecast?
When are TAF's distributed?
4 x's a day. 0000z, 0600z, 1200z, 1800z
How long are TAF's valid?
What do TAF's cover?
5 SM radius around the airport. Wind, visibility, significant weather, clouds, and forecast changes.
What is the abbreviation for an AIRMET?
How often are AIRMET'S distributed?
Every 6 hours/intermediate as needed.
How long are WA's good for?
6 hours. AIRMET
What does an AIRMET cover?
WA, All ac/potential hazards for light ac. Moderate icing, surface winds 30 knots or greater, cielings less than 1,000 ft/vis less than 3SM(IFR), mountain obscurement.
What are the three abbreviations in an AIRMET?
What area must an AIRMET cover?
3000 square miles.
What is the abbreviation for a SIGMET?
When are SIGMET's distributed?
How long are SIGMETS good for?
4 hours, WS
What does a SIGMET cover?
Non-convective weather hazards to all ac. Severe icing, turbulence/CAT, dust/sand storms and volcanic ash lowering vis to 3 sm. First issuance designated urgent (UWS).
What is the abbreviation for a convective sigmet?
When are WST's distributed?
Convective sigmet, 55 minutes past hour/intermediate as needed.
How long are WST's valid?
What does a WST cover?
Convective weather that affects all a/c. Severe thunderstorms, surface winds greater than 50 knots, hail greater than 3/4", tornadoes, embedded thunderstorms, lines or heavy precip that affects 40% or more of a 3,000 square mile region.
How are WST's numbered?
Sequentially starting at 00z. Convective None for no hazards.
What is the abbreviation for a Significant Weather Prognostic Chart?
SIG WX PROG
When are SIG WX PROG distributed?
4 x's a day. 0000z, 0600z, 1200z, 1800z.
How long are SIG WX PROG's valid?
printed on chart.
What does the SIG WX PROG cover?
Forecast for sig weather. Top half includes VFR, IFR, MVFR, freezing levels and turbulence. Bottom half includes pressure systems, fronts and pressure centers.
How often are surface analysis charts distributed, valid time?
Every 3 hours. Current
What does a surface analysis chart cover?
Current surface weather. Highs and lows, fronts, temps, dew points, winds, local weather and visual obstructions.
When are weather depiction charts distributed? Valid?
Every 3 hours starting at 0100z. Current weather
What does a weather depiction chart cover?
Surface conditions derived from METAR. Used for flight planning by giving overall picture of weather across the US. Major fronts, IFR/VFR/MVFR conditions.
What is the abbreviation for a radar summary chart?
When are RD's distributed? Valid?
35 minutes past the hour. Current
What does the RD cover?
Graphical depiction of radar weather reports. Areas of precip and characteristics.
What does ATIS stand for?
Automatic Terminal Information System
When is an ATIS distributed? Valid time?
Continuous and current conditions.
What is an AWOS?
Automated Weather Observation System
When is AWOS distributed and what is it's valid period?
Continuous, and current conditions.
Whwat does the ATIS cover?
Non control information at large airports which includes METAR information via digitized voice.
What does an AWOS cover?
Weather reporting from various sensors via digitized voice.
What does ASOS stand for?
Automated Surface Observation System
When is an ASOS distributed and what is its valid period?
Continuously and current conditions.
What does an ASOS cover?
Surface observation weather via digitized voice.
What does HIWAS stand for?
Hazardous Inflight Weather Advisory
When is HIWAS distributed and what is it's valid period?
Continuously and current.
What does a HIWAS cover?
Broadcasts hazardous weather information over selected NAVAIDS. Contains AIRMETS, SIGMETS, Convective SIGMETS, and urgent PIREPS. Only a summary.
What does EFAS stand for?
Enroute flight advisory system.
When are EFAS distributed?
6 am to 10 pm local time.
What does an EFAS cover?
Flight Watch. Common freq is 122 between 5000 feet AGL and 17,500 MSL.
What does AFSS stand for and what is it?
Automated flight service station, preflight weather info by calling 1-800-wx-brief
What does TIBS stand for and what is it?
Telephone info briefing service. Telephone recordings of weather and flight information