Subj : Wx Terms (N)(2)
To   : All
From : Daryl Stout
Date : Thu Jun 15 2017 07:56 pm

NDFD
(National Digital Forecast Database) - The National Weather Service's
NDFD provides access to gridded forecasts of sensible weather elements
(e.g., wind, wave height) through the National Digital Forecast
Database (NDFD). NDFD contains a seamless mosaic of digital forecasts
from NWS field offices working in collaboration with the National
Centers for Environmental Prediction (NCEP). The database is made
available to all customers and partners from the public, private and
academic sectors. Those customers and partners may use this data to
create a wide range of text, graphic, gridded and image products of
their own.

NE
Northeast

Neap Tide
A minimum tide occurring at the first and third quarters of the moon.

Nearshore Forecast
(NSH) - National Weather Service seasonal marine forecasts for an area
of the Great Lakes extending from a line approximating mean low water
datum along the coast or an island, including bays, harbors, and sounds,
out to 5 nm. These forecasts are normally issued from Daylight Savings
Time approximately April 7 through December 31, though the dates may be
shortened or extended based on local/regional requirements.

NEC
Necessary

NEG
Negative

Negative Vorticity Advection
(Abbrev. NVA) - the advection of lower values of vorticity into an area.

Negative-tilt Trough
An upper level system which is tilted to the west with increasing
latitude (i.e., with an axis from southeast to northwest). A
negative-tilt trough often is a sign of a developing or intensifying
system.

NELY
Northeasterly

NERN
Northeastern

NESDIS
National Environmental Satellite, Data, and Information Service. NESDIS
collects, processes, stores, analyzes, and disseminates various types
of hydrologic, meteorologic, and oceanic data. NESDIS is also
responsible for the development of analytical and descriptive products
so as to meet the needs of its users.

Net All-Wave Radiation
The net or resultant value of the upward and downward longwave and
shortwave radiative fluxes through a plane at the earth-atmosphere
interface; a component of the surface energy budget.

Net Rainfall
In hydrologic terms, the portion of rainfall which reaches a stream
channel or the concentration point as direct surface flow.

Neutral Line
The line that separates longitudinal magnetic fields of opposite
polarity.

Neutral Stability
An atmospheric condition that exists in unsaturated air when the
environmental lapse rate equals the dry adiabatic rate, or in saturated
air when the environmental lapse rate equals the moist adiabatic rate.

NEWD
Northeastward

NEXRAD
NEXt Generation RADar. A NWS network of about 140 Doppler radars
operating nationwide.

NGM
The Nested Grid Model, a 48-hour numerical model of the atmosphere run
twice daily by NCEP.

NGT
Night

NHC
National Hurricane Center - one of three branches of the Tropical
Prediction Center (TPC). This center maintains a continuous watch on
tropical cyclones over the Atlantic, Caribbean, Gulf of Mexico, and the
Eastern Pacific from 15 May through November 30. The Center prepares
and distributes hurricane watches and warnings for the general public,
and also prepares and distributes marine and military advisories for
other users. During the "off-season" NHC provides training for U.S.
emergency managers and representatives from many other countries that
are affected by tropical cyclones. NHC also conducts applied research
to evaluate and improve hurricane forecasting techniques, and is
involved in public awareness programs.

NHOP
(National Hurricane Operations Plan) - The NHOP is issued annually by
the Federal Coordinator for Meteorological Services and Supporting
Research. It documents interdepartmental agreements relating to
tropical cyclone observing, warning, and forecasting services. National
Hurricane Center (NHC), Central Pacific Hurricane Center (CPHC), and
the JTWC serve as the principal offices in coordinating the day-to-day
activities of the NWS in support of the Plan in their region of
responsibility.

Nieve Penitente
A spike or pillar of compacted snow, firn or glacier ice, caused by
differential melting and evaporation. The pillars form most frequently
on low-latitude mountains where air temperatures are near freezing,
dew points are much below freezing and insolation is strong. Penitents
are oriented individually toward the noon-day sun, and usually occur
in east-west lines.

Night
The period of the day between dusk and dawn.

NIL
None

Nimbostratus
(abbrev. NS)- 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).

NLY
Northerly

NM
Nautical Miles

NMBR
Number

NMC
National Meteorological Center

NML
Normal

NMRS
Numerous

NOAA
National Oceanic and Atmospheric Administration

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 operates between 162.40 and 162.55 Megahertz on the Public Service
Band.

NOAA Weather Wire
Mass dissemination via satellite of National Weather Service products
to the media and public.

Noctilucent Clouds
Wavy, thin, bluish-white clouds that are best seen at twilight in
polar latitudes. They form at altitudes about 80 to 90 km above the
Earth's surface.

Nocturnal
Related to nighttime; occurring at night.

Nocturnal Inversion
Used interchangably with Radiational Inversion; a temperature inversion
that develops during the night as a result of radiational cooling of
the surface. Because the immediate surface (lower Boundary Layer) cools
much more rapidly during radiational cooling conditions than the air
just above (upper Boundary Layer), a temperature inversion can be
created overnight, but typically erodes quickly after sunrise.

Nocturnal Jet
This wind speed maximum occurs just above the nocturnal inversion at
night. It is typically found in the south central United States during
the late spring and summer months. It is important in the development
of Mesoscale Convective Complexes (MCC) or Mesoscale Convective Systems
(MCS).

Nocturnal Thunderstorms
Thunderstorms which develop after sunset. They are often associated
with the strengthening of the low level jet and are most common over
the Plains states. They also occur over warm water and may be
associated with the seaward extent of the overnight land breeze.

NOGAPS
Navy Operational Global Atmospheric Prediction System; a 144-hour
numerical model of the atmosphere run by the U.S. Navy twice daily.

NOHRSC
In hydrologic terms, the National Operational Hydrologic Remote Sensing
Center. An organization under the National Weather Service Office of
Hydrology (OH) that mainly deals with snow mapping.



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