ETA1. The Eta Model, now referred to as North Amercian Meso (NAM) an 84-hour numerical model of the atmosphere run four times daily by NCEP. This is one of the main forecast models used for short-term weather prediction in the United States.
2. Estimated Time of ArrivalEta ModelNow referred to as North Amercian Meso (NAM) is one of the operational numerical forecast models run at NCEP. The Eta is run four times daily, with forecast output out to 84 hours.Interplanetary Magnetic Field(abbrev. IMF) In solar-terrestrial terms, the magnetic field carried with the
solar wind.METARAn international code (Aviation Routine Weather Report) used for reporting, recording and transmitting weather observations.Planetary Boundary LayerThe layer within the atmosphere between 1 km and the earth's surface where friction affects wind speed and wind direction.Theta-e(or Equivalent Potential Temperature) - The temperature a parcel of air would have if
a) it was lifted until it
became saturated,
b) all water vapor was condensed out, and
c) it was returned adiabatically (i.e., without
transfer of heat or mass) to a pressure of 1000 millibars.
Theta-e, which typically is expressed in degrees
Kelvin, is directly related to the amount of heat present in an air parcel. Thus, it is useful in diagnosing
atmospheric instability. Theta-e RidgeAn axis of relatively high values of theta-e. Severe weather and excessive rainfall often occur near or just upstream from a theta-e ridge.THETAEAbbreviation for Theta-e; the temperature a parcel of air would have if
a) it was lifted until it became saturated,
b) all water vapor was condensed out, and
c) it was returned adiabatically (i.e., without transfer of heat or mass) to a pressure of 1000 millibars.
Theta-e, which typically is expressed in degrees Kelvin, is directly related to the amount of heat present in an air parcel. Thus, it is useful in diagnosing atmospheric instability.
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