Subj : Wx Terms (A)(5)
To   : All
From : Daryl Stout
Date : Mon Oct 02 2017 12:04 am

Arctic Sea Smoke
Steam fog, but often specifically applied to steam fog rising from small
open water within sea ice.

Arcus
A low, horizontal cloud formation associated with the leading edge of
thunderstorm outflow (i.e., the gust front). Roll clouds and shelf clouds
both are types of arcus clouds.

Area Forecast Discussion
This National Weather Service product is intended to provide a
well-reasoned discussion of the meteorological thinking which went into
the preparation of the Zone Forecast Product. The forecaster will try to
focus on the most particular challenges of the forecast. The text will be
written in plain language or in proper contractions. At the end of the
discussion, there will be a list of all advisories, non-convective
watches, and non-convective warnings. The term non-convective refers to
weather that is not caused by thunderstorms. An intermediate Area
Forecast Discussion will be issued when either significant forecast
updates are being made or if interesting weather is expected to occur.

Area of Influence
In hydrologic terms, the area covered by the drawdown curves of a given
pumping well or combination of wells at a particular time.

Area Source
An array of pollutant sources, so widely dispersed and uniform in
strength that they can be treated in a dispersion model as an aggregate
pollutant release from a defined area at a uniform rate. Compare line
source and point source.

Area Wide Hydrologic Prediction System
(Abbrev. AWHPS) - A computer system which automatically ingests areal
flash flood guidance values and WSR-88D products and displays this data
and other hydrologic information on a map background.

Area-Capacity Curve
In hydrologic terms, a graph showing the relation between the surface
area of the water in a reservoir, the corresponding volume, and
elevation.

Arid
An adjunctive applied to regions where precipitation is so deficient in
quantity, or occurs at such times, that agriculture is impracticable
without irrigation.

ARINC
Aeronautical Radio, Incorporated

ARND
Around

ARR
Arrive/Arrival

Arroyo
In hydrologic terms, a water-carved channel or gully in arid country,
usually rather small with steep banks, dry most of the time, due to
infrequent rainfall and the shallowness of the cut which does not
penetrate below the level of permanent ground water.

ARSI
Atmospheric Research System, Inc.

ART
The Automatic Radiotheodolite. A ground-based radio direction finder
that automatically tracks a ballon-borne radiosonde.

ARTCC
Air Route Traffic Control Center

Artesian Well
In hydrologic terms, a well drilled into a confined aquifer with enough
hydraulic pressure for the water to flow to the surface without pumping.
Also called a flowing well.

Artificial Control
In hydrologic terms, a weir or other man-made structure which serves as
the control for a stream-gaging station.

AS
(NOTE: if this appears in an Area Forecast Discussion or other text
product in context as the word "as," disregard the technical definition
below).

Abbreviation for Altostratus, a cloud of a class characterized by a
generally uniform gray sheet or layer, lighter in color than nimbostratus
and darker than cirrostratus. These clouds are of medium altitude, about
8000 to 20,000 ft (2400-6100 m).

ASAP
1. AHOS SHEF Automatic Processing System

2. As soon as possible (may be used in Area Forecast Discussions)

ASAPTRAN
The software component of ASAP.

ASB
Aviation Support Branch

ASL
Above Sea Level

ASOS
Automated Surface Observing System

Astronomical Dawn
The time at which the sun is 18� below the horizon in the morning.
Astronomical dawn is that point in time at which the sun starts l
ightening the sky. Prior to this time during the morning, the sky is
completely dark.

Astronomical Dusk
This is the time at which the sun is 18� below the horizon in the
evening. At this time the sun no longer illuminates the sky.

Astronomical Unit
(abbrev. AU)- The mean earth-sun distance, equal to 1.496x1013 cm, or
214.94 solar radii.

ATC
Air Traffic Control

ATDTDCS
Automated Tone Dial Telephone Data Collection System - Data collection
system where cooperative observers collect precipitation, stage, and
temperature data then transmit the data to the NWS ATDTDCS computer
through the telephone lines. The ATDTDCS computer transmits the data to
AFOS.

Atmosphere
The air surrounding and bound to the Earth.

Atmospheric Boundary Layer
Same as Boundary Layer - in general, a layer of air adjacent to a
bounding surface. Specifically, the term most often refers to the
planetary boundary layer, which is the layer within which the effects
of friction are significant. For the earth, this layer is considered to
be roughly the lowest one or two kilometers of the atmosphere. It is
within this layer that temperatures are most strongly affected by
daytime insolation and nighttime radiational cooling, and winds are
affected by friction with the earth's surface. The effects of friction
die out gradually with height, so the "top" of this layer cannot be
defined exactly.

Atmospheric Circulation Model
A mathematical model for quantitatively describing, simulating, and
analyzing the structure of the circulation in the atmosphere and the
underlying causes. Sometimes referred to as Atmospheric General
Circulation Models or AGCMs.

Atmospheric Pressure
The pressure exerted by the earth's atmosphere at any given point,
determined by taking the product of the gravitational acceleration at
the point and the mass of the unit area column of air above the point.

Atmospheric Radiation
Infrared radiation (energy in the wavelength interval of 3 -80
micrometer) emitted by or being propagated through the atmosphere. It
consists of both upwelling and downwelling components. Compare with
terrestrial radiation.

ATMP
On a buoy report, the air temperature (Celsius).

Attenuation
It refers to the reduction of the radar beam power due to the reflection
or absorption of energy when it strikes a target. The greatest
attenuation occurs when the radar beam goes through very heavy rain.

ATTM
At this time

Augmented report
A meteorological report prepared by an automated surface weather
observing system for transmission with certified observers signed on to
the system to add information to the report.

Aurora
A faint visual phenomenon associated with geomagnetic activity, which
occurs mainly in the high-latitude night sky; typical auroras are 100
to 250 km above the ground.

Aurora Australis
Same as Aurora Borealis, but in the Southern Hemisphere. Also known as
the southern lights; the luminous, radiant emission from the upper
atmosphere over middle and high latitudes, and centred around the
earth's magnetic poles. These silent fireworks are often seen on clear
winter nights in a variety of shapes and colors.

Aurora Borealis
Also known as the northern lights; the luminous, radiant emission from
the upper atmosphere over middle and high latitudes, and centred around
the earth's magnetic poles. These silent fireworks are often seen on
clear winter nights in a variety of shapes and colors.



---
� Synchronet � The Thunderbolt BBS - wx1der.dyndns.org

You are viewing proxied material from bbs.kd3.us. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.