Dangerous severe weather will continue overnight in the nation’s heartland with potentially intense tornadoes and very large hail. The threat for severe weather will shift eastward into the Ohio Valley and mid-South on Tuesday. Farther west on the back side of this large storm system, strong winds and critical fire weather will affect the southern and central High Plains through midweek. Read More >
J/kg
Joules per kilogram, unit commonly used to represent CAPE and CIN.
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.
JTWC
Joint Typhoon Warning Center
Juvenile Water
In hydrologic terms, water formed chemically within the earth and brought to the surface in intrusive rock
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