Subj : Wx Terms (I)(2)
To   : All
From : Daryl Stout
Date : Thu Aug 10 2017 12:08 am

Inflow Bands
Bands of low clouds, arranged parallel to the low-level winds and moving
into or toward a thunderstorm. They may indicate the strength of the
inflow of moist air into the storm, and, hence, its potential severity.
Spotters should be especially wary of inflow bands that are curved in a
manner suggesting cyclonic rotation; this pattern may indicate the
presence of a mesocyclone.

Inflow Jets
Local jets of air near the ground flowing inward toward the base of a
tornado.

Inflow Notch
A radar signature characterized by an indentation in the reflectivity
pattern on the inflow side of the storm. The indentation often is
V-shaped, but this term should not be confused with V-notch. Supercell
thunderstorms often exhibit inflow notches, usually in the right
quadrant of a classic supercell, but sometimes in the eastern part of
an HP storm or in the rear part of a storm (rear inflow notch).

Inflow Stinger
A beaver tail cloud with a stinger-like shape.

Influent Seepage
In hydrologic terms, movement of gravity water in the zone of aeration
from the ground surface toward the water table.

Influent Stream
In hydrologic terms, any watercourse in which all, or a portion of the
surface water flows back into the ground namely the, vadose zone, or
zone of aeration.

Infrared Satellite Imagery
This satellite imagery senses surface and cloud top temperatures by
measuring the wavelength of electromagnetic radiation emitted from
these objects. This energy is called "infrared". High clouds are very
cold, so they appear white. Mid-level clouds are somewhat warmer, so
they will be a light gray shade. Low cloud are warmer still, so they
appear as a dark shade of gray or black. Often, low clouds are the same
temperature as the surrounding terrain and cannot be distinguished at
all. The satellite picks up this infrared energy between 10.5 and 12.6
micrometer (um) channels.

Initial Detention
In hydrologic terms, the volume of water on the ground, either in
depressions or in transit, at the time active runoff begins.

Inland freshwater wetlands
In hydrologic terms, swamps, marshes, and bogs found inland beyond the
coastal saltwater wetlands.

Inland Hurricane Warning
Issued for interior counties that sustained winds of 74 mph or greater
associated with a hurricane are expected within 24 hours.

Inland Hurricane Watch
Issued for interior counties when sustained winds of 74 mph or greater
associated with a hurricane are possible within 36 hours.

Inland Tropical Storm Warning
Issued for interior counties when sustained winds of 39 to 73 mph
associated with a tropical storm are expected within 24 hours.

Inland Tropical Storm Watch
Issued for interior counties when sustained winds of 39 to 73 mph
associated with a tropical storm are possible within 36 hours.

INLD
Inland

Insolation
Incoming solar radiation. Solar heating; sunshine.

Instability
(abbrev. INSTBY)- The tendency for air parcels to accelerate when they
are displaced from their original position; especially, the tendency to
accelerate upward after being lifted. Instability is a prerequisite for
severe weather - the greater the instability, the greater the potential
for severe thunderstorms.

INSTBY
Instability- The tendency for air parcels to accelerate when they are
displaced from their original position; especially, the tendency to
accelerate upward after being lifted. Instability is a prerequisite for
severe weather - the greater the instability, the greater the potential
for severe thunderstorms.

Instrument Flight Rules
Refers to the general weather conditions pilots can expect at the
surface and applies to the weather situations at an airport during
which a pilot must use instruments to assist take off and landing. IFR
conditions for fixed wing aircraft means the minimum cloud ceiling is
greater than 500 feet and less than 1,000 feet and/or visibility is
greater than 1 mile and less than 3 miles.

Instrument Shelter
A boxlike structure designed to protect temperature measuring
instruments from exposure to direct sunshine, precipitation, and
condensation, while at the same time time providing adequate
ventilation.

Intangible Flood Damage
In hydrologic terms, estimates of the damage done by disruption of
business, danger to health, shock, and loss of life and in general all
costs not directly measurable which require a large element of judgment
for estimating.

Interbasin Transfer
In hydrologic terms, the physical transfer of water from one watershed
to another.

Interception
In hydrologic terms, the process by which precipitation is caught and
held by foliage, twigs, and branches of trees, shrubs, and other
vegetation, and lost by evaporation, never reaching the surface of the
ground. Interception equals the precipitation on the vegetation minus
streamflow and through fall.

Interception Storage Requirements
In hydrologic terms, water caught by plants at the onset of a rainstorm.
This must be met before rainfall reaches the ground.

Interflow
In hydrologic terms, the lateral motion of water through the upper
layers until it enters a stream channel. This usually takes longer to
reach stream channels than runoff. This also called subsurface storm
flow.

Intermediate Synoptic Times
The times of 0300, 0900, 1500, and 2100 UTC.

Intermittent Stream
In hydrological terms, a stream that flows periodically.

International Date Line
The line of longitude located at 180 degrees East or West (with a few
local deviations) where the date changes by a day. West of the line it
is one day later than east of the line.

Interplanetary Magnetic Field
(abbrev. IMF) In solar-terrestrial terms, the magnetic field carried
with the solar wind.

Interpolate
To estimate a value within an interval between two known values. This
technique is sometimes used with computer models for locations in
between the model's "gridpoints."

Intertropical Convergence Zone
(ITCZ) The region where the northeasterly and southeasterly trade winds
converge, forming an often continuous band of clouds or thunderstorms
near the equator.

Intraseasonal Oscillation
Oscillation with variability on a timescale less than a season. One
example is the Madden-Julian Oscillation.

INTS
Intense

INTSFY
Intensify

INTST
Intensity

Inversion
(abbrev. INVRN) Generally, a departure from the usual increase or
decrease in an atmospheric property with altitude. Specifically it
almost always refers to a temperature inversion, i.e., an increase in
temperature with height, or to the layer within which such an increase
occurs. An inversion is present in the lower part of a cap.

INVOF
In the vicinity of

INVRN
Inversion- Generally, a departure from the usual increase or decrease
in an atmospheric property with altitude. Specifically it almost always
refers to a temperature inversion, i.e., an increase in temperature
with height, or to the layer within which such an increase occurs. An
inversion is present in the lower part of a cap.

Ionosphere
A complex atmospheric zone of ionized gases that extends between 50 and
400 miles (80 to 640 kilometers) above the earth's surface. It is
located between the mesosphere and the exosphere and is included as part
of the thermosphere.

Ionospheric Storm
A disturbance in the F region of the ionosphere, which occurs in
connection with geomagnetic activity.

IPV
Improve

IR
Infrared Satellite Imagery



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