Conventional observations assimilated into the HIRLAM 3DVAR system, where z is geopotential height, u is zonal wind component, v is meridional wind component, T is temperature, and q is specific humidity Observation type Parameters assimilated Surface SYNOP z SHIP z DRIBU z Upper air TEMP u, v, T, q AIREP
u, v, T PILOT u, v Table 3.
Both will take you directly to PIREP and AIREP reports respectively.
Where can you easily find PIREPs and AIREPs? (May have multiple answers.)
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These air-reports (AIREPs
) follow a format similar to PIREPs, but are typically transmitted to a ground station over a data link, which then relays it to ATC.
* * * CANADIAN RADAR * * PRECIP AT SURFACE * * * CITY FORECASTS * * * TFR * * * METARS * * * TAFS * * * COUNTY WARNINGS * * * WINDS ALOFT * * GROUND LIGHTING * * AIRMETS * * SIGMETS * * ECHO TOPS * * FREEZING LEVEL * * SEVERE STORM TRACKS * * SURFACE ANALYSIS * * SATELLITE MOSAIC * * AIREPS
* * PIREPS * * SPC WATCHES * * TURBULENCE * CURRENT ICING * SLD * DAY 1 CONVECTIVE * MESOSCALE DISCUSS * VISIBILITY * HURRICANE TRACK *
Although the initial use of these limited aircraft reports (AIREPs
) was restricted primarily to research applications, the number, quality, and operational use of these data have expanded substantially in the years since.