Subj : Wx Terms (L)(3)
To : All
From : Daryl Stout
Date : Sun Aug 13 2017 01:17 pm
LIVV
Lifted Index Vertical Velocity
LKLY
Likely- In probability of precipitation statements, the equivalent of a
60 or 70 percent chance.
LLJ
Low Level Jet - A region of relatively strong winds in the lower part of
the atmosphere. Specifically, it often refers to a southerly wind
maximum in the boundary layer, common over the Plains states at night
during the warm season (spring and summer). The term also may be used to
describe a narrow zone of strong winds above the boundary layer, but in
this sense the more proper term would be low-level jet stream.
LLWS
Low Level Wind Shear
LMTD
limited
LN
Line
Loaded Gun (Sounding)
[Slang], a sounding characterized by extreme instability but containing
a cap, such that explosive thunderstorm development can be expected if
the cap can be weakened or the air below it heated sufficiently to
overcome it.
Local Convective Wind
In fire weather terminology, local thermally driven winds arising over a
comparatively small area and influenced by local terrain. Examples
include sea and land breezes, lake breezes, diurnal mountain wind
systems and columnar convective currents.
Lofting
A pattern of plume dispersion in a stable boundary layer topped by a
neutral layer, in which the upper part of the plume disperses upward
while the lower part of the plume undergoes little dispersion.
Long Term Retention
Retention of data for 5 years to satisfy requirements for local studies
and to support litigation.
Longitude
The location east or west in reference to the Prime Meridian, which is
designated as zero (0) degrees longitude. The distance between lines of
longitude are greater at the equator and smaller at the higher latitudes,
intersecting at the earth's North and South Poles. Time zones are
correlated to longitude.
Longwave Radiation
A term used to describe the infrared energy emitted by the earth and
atmosphere at wavelengths between about 5 and 25 micrometers. Compare
shortwave radiation.
Longwave Trough
A trough in the prevailing westerly flow aloft which is characterized
by large length and (usually) long duration.
Loop Prominence System
(abbrev. LPS) In solar-terrestrial terms, a system of loop prominences
associated with major flares.
Looping
A pattern of plume dispersion in an unstable atmosphere, in which the
plume undergoes marked vertical oscillations as it is alternately
affected by rising convective plumes and the subsiding motions between
the plumes.
LOPRES
low pressure
Loran
Long Range Navigation, a system of long range navigation whereby
latitude and longitude are determined from the time displacement of
radio signals from two or more fixed transmitters.
Lotic System
In hydrologic terms, a flowing body of fresh water, such as a river or
stream.
Low
A region of low pressure, marked as "L" on a weather map. A low center
is usually accompanied by precipitation, extensive cloudiness, and
moderate winds. See Cyclone.
Low Frequency
(abbrev. LF) The portion of the radio frequency spectrum from 30 to
300 kHz.
Low Level Jet
(abbrev. LLJ)- A region of relatively strong winds in the lower part of
the atmosphere. Specifically, it often refers to a southerly wind
maximum in the boundary layer, common over the Plains states at night
during the warm season (spring and summer).
The term also may be used to describe a narrow zone of strong winds
above the boundary layer, but in this sense the more proper term would
be low-level jet stream.
Low Pressure System
An area of a relative pressure minimum that has converging winds and
rotates in the same direction as the earth. This is counterclockwise
in the Northern Hemisphere and clockwise in the Southern Hemisphere.
Also known as an cyclone, it is the opposite of an area of high
pressure, or a anticyclone.
Lowland Flooding
In hydrologic terms, inundation of low areas near the river, often
rural, but may also occur in urban areas.
LP Storm
Low-Precipitation storm (or Low-Precipitation supercell). A supercell
thunderstorm characterized by a relative lack of visible precipitation.
Visually similar to a classic supercell, except without the heavy
precipitation core. LP storms often exhibit a striking visual
appearance; the main tower often is bell-shaped, with a corkscrew
appearance suggesting rotation. They are capable of producing tornadoes
and very large hail. Radar identification often is difficult relative
to other types of supercells, so visual reports are very important. LP
storms almost always occur on or near the dry line, and thus are
sometimes referred to as dry line storms.
LPS
Loop Prominence System- In solar-terrestrial terms, a system of loop
prominences associated with major flares.
LRG
Large
LSR
Local Storm Report. A product issued by local NWS offices to inform
users of reports of severe and/or significant weather-related events
LST
Local Standard Time
LTD
Limited
LTL
Little
LTLCG
Little Change
LTNG
Lightning- A visible electrical discharge produced by a thunderstorm.
The discharge may occur within or between clouds, between the cloud
and air, between a cloud and the ground or between the ground and a
cloud.
LTR
Later
LTST
latest
LVL
Level
LVLS
levels
LWR
Lower
Lysimeter
In hydrologic terms, a device to measure the quantity or rate of
downward water movement through a block of soil usually undisturbed,
or to collect such percolated water for analysis as to quality.
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