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Terms

Additive Data—A group of coded remarks that includes pressure tendency, amount of
precipitation, and maximum/minimum temperature during specified periods of time.
Aviation Routine Weather Report—The WMO METAR code format used worldwide to encode
weather observations.
Eyes Forward—WF/Det technicians are the eyes forward for the OWS forecasters and integrate
weather radar data, meteorological satellite imagery, lightning detection readouts, and non-
standard weather data systems (vertical profilers, mesonet data, etc.) to create an integrated
weather picture and near-term trend forecasts for the OWS. Eyes forward yields meaningful
meteorological information not contained in coded observations to the servicing OWS and is an
integral part of the meteorological watch for an installation or contingency operating location.
File Time—The specific time or specific time block a weather message or bulletin is scheduled to
be transmitted.
Freezing Rain—Rain that falls in liquid form but freezes upon impact to form a coating of glaze
upon the ground and on exposed objects.

Glaze—A coating of ice formed by freezing precipitation covering the ground or exposed objects.
ICAO Identifier—A specifically authorized 4-letter identifier assigned to a location and
documented in ICAO Document 7910.ICAO.
International Civil Aviation Organization—A United Nations organization specializing in
matters dealing with international aviation and navigation.
Joint Environmental Toolkit (JET)—JET consolidates and integrates key capabilities from
several familiar systems (N-TFS, OPS-II, JWIS, AOS, IWWC, IWEDA, IMETS…) used in
OWSs, WFs/Dets, AOCs, and even deployed into one seamless application.
Limited-Duty Unit—A WF/Det that provides less than 24-hour a day forecast service.

Longline—dissemination of a surface weather observation outside of local installation.
Notice to Airmen (NOTAM)—A timely notice containing information concerning the
establishment, condition, or change in any aeronautical facility, service, procedures, or hazards,
essential to personnel concerned with flight operations.
Observed—Indicates reported weather information was determined visually by weather
personnel, or weather sensing equipment, or by using radar.

Pilot Report (PIREP)—A report of in-flight weather provided by an aircraft crewmember.
Severe Weather—Any weather condition that poses a hazard to property or life.