• Weather Glossary (J)

    From Daryl Stout@57:57/10 to All on Fri Oct 30 00:06:01 2020
    This weather glossary contains information on more than 2000 terms,
    phrases and abbreviations used by the National Weather Service (NWS)...
    the government agency who makes weather forecasts, and issues weather advisories, watches, and warnings, for the United States, and its
    territories.

    Many of these terms and abbreviations are used by NWS forecasters to communicate between each other and have been in use for many years and
    before many NWS products were directly available to the public. It is the purpose of this glossary to aid you in better understanding NWS products.

    ***

    January Thaw
    A period of mild weather popularly supposed to recur each year in late
    January.

    Jet
    A fast-moving wind current surrounded by slower moving air.

    Jet Max
    (or Jet Streak) A point or area of relative maximum wind speeds within a
    jet stream.

    Jet Streak
    Same as Jet Max; a point or area ("streak") of relative maximum wind
    speeds within a jet stream.

    Jet Stream
    (abbrev. JSTR) Relatively strong winds concentrated in a narrow stream
    in the atmosphere, normally referring to horizontal, high-altitude
    winds. The position and orientation of jet streams vary from day to
    day. General weather patterns (hot/cold, wet/dry) are related closely
    to the position, strength and orientation of the jet stream (or jet
    streams). A jet stream at low levels is known as a low-level jet.

    Jet Stream Cirrus
    A loose term for filamentous cirrus that appears to radiate from a point
    in the sky, and exhibits characteristics associated with strong vertical
    wind shear, such as twisted or curved filaments.

    Jet Wind Speed Profile
    A vertical wind speed profile characterized by a relatively narrow
    current of high winds with slower moving air above and below. A large
    wind (speed) shear occurs above and below the jet axis.

    Jetty
    In hydrologic terms, a structure (e.g.; a pier, or mole of wood or
    stone) extending into a sea, lake, or river to influence the current
    or tide or to protect a harbor.

    JMA
    Japanese Meteorological Agency

    Jokulhlaup
    In hydrologic terms, an Icelandic term meaning glacier dammed lake
    outburst flood.

    JSTR
    Jet Stream - Relatively strong winds concentrated in a narrow stream
    in the atmosphere, normally referring to horizontal, high-altitude
    winds. The position and orientation of jet streams vary from day to
    day. General weather patterns (hot/cold, wet/dry) are related closely
    to the position, strength and orientation of the jet stream (or jet
    streams). A jet stream at low levels is known as a low-level jet.

    Juvenile Water
    In hydrologic terms, water formed chemically within the earth and
    brought to the surface in intrusive rock.

    J\/kg
    Joules per kilogram, unit commonly used to represent CAPE and CIN.
    --- SBBSecho 3.11-Win32
    * Origin: The Thunderbolt BBS - tbolt.synchro.net (57:57/10)