Subj : Wx Terms (N)(3)
To : All
From : Daryl Stout
Date : Wed Nov 15 2017 12:05 am
Non-Uniform Sky Condition
A localized sky condition which varies from that reported in the body
of the report.
Non-Uniform Visibility
A localized visibility which varies from that reported in the body of
the report.
Nonattainment Area
An area that does not meet ambient air quality standards.
Normal
The long-term average value of a meteorological paramater (i.e.,
temperature, humidity, etc.) for a certain area. For example,
"temperatures are normal for this time of year" means that temperatures
are at or near the average climatological value for the given date.
Normals are usually taken from data averaged over a 30-year period
(e.g., 1971-2000 average), and are concerned with the distribution of
data within limits of common occurrence.
Normal Water Surface Elevation
In hydrologic terms, the lowest crest level of overflow on a reservoir
with a fixed overflow level (spillway crest elevation). For a reservoir
whose outflow is controlled wholly or partly by movable gates, siphons,
or other means, it is the maximum level to which water may rise under
normal operating conditions, exclusive of any provision for flood
surcharge.
Normal Year
A year during which the precipitation or stream flow approximates the
average for a long period of record.
North Atlantic Oscillation
(Abbrev. NAO) - the NAO is a large-scale fluctuation in atmospheric
pressure between the subtropical high pressure system located near the
Azores in the Atlantic Ocean and the sub-polar low pressure system near
Iceland and is quantified in the NAO Index. The surface pressure drives
surface winds and wintertime storms from west to east across the North
Atlantic affecting climate from New England to western Europe as far
eastward as central Siberia and eastern Mediterranean and southward to
West Africa.
North Pacific High
A semi-permanent, subtropical area of high pressure in the North Pacific
Ocean. It is strongest in the Northern Hemispheric summer and is
displaced towards the equator during the winter when the Aleutian Low
becomes more dominate. Comparable systems are the Azores High and the
Bermuda High.
North Wall
The north side boundary of the Gulf Stream generally extending northeast
from Cape Hatteras where the Gulf Stream turns northeast.
Northern Lights
Common name for Aurora Borealis; 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 colours.
Nor'easter
A strong low pressure system that affects the Mid Atlantic and New
England States. It can form over land or over the coastal waters. These
winter weather events are notorious for producing heavy snow, rain, and
tremendous waves that crash onto Atlantic beaches, often causing beach
erosion and structural damage. Wind gusts associated with these storms
can exceed hurricane force in intensity. A nor'easter gets its name from
the continuously strong northeasterly winds blowing in from the ocean
ahead of the storm and over the coastal areas.
Nowcast
A short-term weather forecast, generally out to six hours or less. This
is also called a Short Term Forecast.
NR
Near
NRN
Northern
NRW
Narrow
NS
Nimbostratus- A cloud of the class characterized by a formless layer that
is almost uniformly dark gray; a rain cloud of the layer type, of low
altitude, usually below 8000 ft (2400 m).
NSSFC
National Severe Storm Forecast Center
NSSL
National Severe Storms Laboratory - this is one of NOAA's internationally
known Environmental Research Laboratories, leading the way in
investigations of all aspects of severe weather. Headquartered in Norman
OK with staff in Colorado, Nevada, Washington, Utah, and Wisconsin, the
people of NSSL, in partnership with the National Weather Service, are
dedicated to improving severe weather warnings and forecasts in order to
save lives and reduce property damage.
Numerical Forecasting
A computer forecast or prediction based on equations governing the
motions and the forces affecting motion of fluids. The equations are
based, or initialized, on specified weather or climate conditions at a
certain place and time.
Numerical Weather Prediction
Same as Numerical Forecasting; a computer forecast or prediction based
on equations governing the motions and the forces affecting motion of
fluids. The equations are based, or initialized, on specified weather
or climate conditions at a certain place and time.
Numerous
A National Weather Service convective precipitation descriptor for a
60 or 70 percent chance of measurable precipitation (0.01 inch).
NVA
Negative Vorticity Advection - the advection of lower values of vorticity
into an area.
NW
Northwest
NWD
Northward
NWLY
Northwesterly
NWP
Numerical Weather Prediction
NWR
NOAA Weather Radio - "the voice of the National Weather Service" - NOAA
Weather Radio broadcasts National Weather Service warnings, watches,
forecasts and other hazard information 24 hours a day. It is provided as
a public service by NOAA. The NOAA Weather Radio network has more than
480 stations in the 50 states and near adjacent coastal waters, Puerto
Rico, the U.S. Virgin Islands and U.S. Pacific Territories. It is found
from 162.40 to 162.55 Megahertz on the Public Service Band.
NWRD
Northwestward
NWRN
Northwestern
NWS
National Weather Service. An agency of the Federal Government within
the Department of Commerce, National Oceanic and Atmospheric
Administration, which is responsible for providing observations,
forecasts and warnings of meteorological and hydrological events in
the interest of national safety and economy.
NWSH
National Weather Service Headquarters
NWSO
National Weather Service Office
NXT
Next
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