Subj : Wx Terms (C)(2)
To   : All
From : Daryl Stout
Date : Wed Oct 04 2017 08:31 am

CCL
Convective Condensation Level- The level in the atmosphere to which an
air parcel, if heated from below, will rise dry adiabatically, without
becoming colder than its environment just before the parcel becomes
saturated. See Lifted Condensation Level (LCL).

CD
cold

CDB
Computing Development Branch (NCEP)

CDC
Climate Diagnostic Center, the mission of the Climate Diagnostics
Center (CDC) is to advance national capabilities to interpret the
causes of observed climate variations, and to apply this knowledge to
improve climate models and forecasts and develop new climate products
that better serve the needs of the public and decision-makers.

CDD
Cooling Degree Days- A form of degree day used to estimate energy
requirements for air conditioning or refrigeration. Typically,
cooling degree days are calculated as how much warmer the mean
temperature at a location is than 65� F on a given day. For example,
if a location experiences a mean temperature of 75� F on a certain day,
there were 10 CDD (Cooling Degree Days) that day because 75 - 65 = 10.

CDFNT
Cold Front

CDT
Central Daylight Time

Ceiling
(Abbrev. CIG) - The height of the cloud base for the lowest broken or
overcast cloud layer.

Ceilometer
A device using a laser or other light source to determine the height of
a cloud base. An optical ceilometer uses triangulation to determine the
height of a spot of light projected onto the base of the cloud; a laser
ceilometer determines the height by measuring the time required for a
pulse of light to be scattered back from the cloud base.

Cell
Convection in the form of a single updraft, downdraft, or
updraft/downdraft couplet, typically seen as a vertical dome or tower
as in a towering cumulus cloud. A typical thunderstorm consists of
several cells.

The term "cell" also is used to describe the radar echo returned by an
individual shower or thunderstorm. Such usage, although common, is
technically incorrect.

Celsius
The standard scale used to measure temperature in most areas outside
the United States. On this scale, the freezing point of water is 0� F
and the boiling point is 100� F. To convert a Fahrenheit temperature to
Celsius, subtract 32 from it and then multiply by 5/9:

�C = (�F - 32) * 5/9

CEM
Civil Emergency Message. A message issued by the National Weather
Service in coordination with Federal, state or local government to warn
the general public of a non-weather related time-critical emergency
which threatens life or property, e.g. nuclear accident, toxic chemical
spill, etc.

Center
Generally speaking, the vertical axis of a tropical cyclone, usually
defined by the location of minimum wind or minimum pressure. The cyclone
center position can vary with altitude. In advisory products, refers to
the center position at the surface.

Centimeter Burst
A solar radio burst in the centimeter wavelength range.

Central Meridian Passage (CMP)
In solar-terrestrial terms, the passage of an Active Region or other
feature across the longitude meridian that passes through the apparent
center of the solar disk.

CFC
Chlorofluorocarbon

CFP
Cold Front Passage

CFS
In hydrologic terms, Cubic Feet per Second - the flow rate or discharge
equal to one cubic foot (of water, usually) per second. This rate is
equivalent to approximately 7.48 gallons per second. This is also
referred to as a second-foot.

Cfs-Day
In hydrologic terms, the volume of water discharged in twenty four hours,
with a flow of one cubic foot per second is widely used; 1 cfs-day is
24 x 60 x 60 = 86,000 cubic feet, 1.983471 acre-feet, or 646,317 gallons.
The average flow in cubic feet per second for any time period is the
volume of flow in cfs-days.

CG
Cloud-to-Ground Lightning

Chance
A National Weather Service precipitation descriptor for 30, 40, or 50
percent chance of measurable precipitation (0.01 inch). When the
precipitation is convective in nature, the term scattered is used. See
Precipitation Probability (PoP).

Channel
In hydrologic terms, also known as Watercourse; an open conduit either
naturally or artificially created which periodically, or continuously
contains moving water, or forms a connecting link between two bodies of
water. River, creek, run, branch, anabranch, and tributary are some of
the terms used to describe natural channels. Natural channels may be
single or braided. Canal and floodway are some of the terms used to
describe artificial channels.

Channel Inflow
In hydrologic terms, water, which at any instant, is flowing into the
channel system form surface flow, subsurface flow, base flow, and
rainfall that has directly fallen onto the channel.

Channel Lead
In hydrologic terms, an elongated opening in the ice cover caused by a
water current.

Channel Routing
In hydrologic terms, the process of determining progressively timing
and shape of the flood wave at successive points along a river.

Channeled High Winds
In mountainous areas or in cities with tall buildings, air may be
channeled through constricted passages producing high winds. Santa Ana
winds and winds through passes from the cold Alaskan interior to the
sea are examples of these winds. Channeled high winds are local in
nature but can be extremely strong. These winds generally occur in
well-defined areas.

Channelization
In hydrologic terms, the modification of a natural river channel; may
include deepening, widening, or straightening.

CHC
Chance

Chemistry Model
A computer model used in air pollution investigations that simulates
chemical and photochemical reactions of the pollutants during their
transport and diffusion.

CHG
Change

CHGS
changes

Chinook
This is a region-specific term used for Foehn Winds in the lee of the
Rocky Mountains in the United States; Foehn Winds are warm, dry winds
that occur in the lee of high mountain ranges. It is a fairly common
wintertime phenomena in the mountainous west and in parts of Alaska.
These winds develop in well-defined areas and can be quite strong.

Chinook Arch
A foehn cloud formation appearing as a bank of altostratus clouds east
of the Rocky Mountains, heralding the approach of a chinook. It forms
in the rising portion of standing waves on the lee side of the
mountains. An observer underneath or east of the cloud sees an arch of
clear air between the cloud's leading edge and the mountains below.
The cloud appears to converge with the mountains to the north and south
due to a perspective effect.

Chlorofluorocarbons
(CFCs) - Manufactured substances used as coolants and computer-chip
cleaners. When these products break down they destroy stratospheric
ozone, creating the Antarctic Ozone Hole in the Southern Hemisphere
spring (Northern Hemisphere autumn). While no longer in use, their
long lifetime will lead to a very slow removal from the atmosphere.

Chromosphere
In solar-terrestrial terms, the layer of the solar atmosphere above the
photosphere and beneath the transition region and the corona.

Chromospheric Events
In solar-terrestrial terms, flares that are just Chromospheric Events
without Centimetric Bursts or Ionospheric Effects. (SID)
(Class C flare)



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