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Narrowband
Data - the collection of data products transmitted from the
a WSR-88D RPG to
a PUP or to a NIDS vendor
for external distribution
NCAR
- acronym for National Center for Atmospheric
Research in Boulder, CO
NCEP
- acronym for National Centers for Environmental
Prediction; the modernized version of NMC
NDVI
(Normalized Difference Vegetation Index)- an index produced
using AVHRR data from NOAA
polar orbiting satellites. The index
is used for monitoring vegetation changes over large areas with a resolution
up to 1 km.
Near-Infrared
Radiation - a type of electromagnetic
radiation having a slightly higher wavelength
than visible radiation
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);
often it is a sign of a developing or intensifying system
Net
Solar Radiation - the difference between the downward and upward
fluxes of solar radiation
Net
Terrestrial Radiation - the difference between the downward
and upward fluxes of the terrestrial
radiation fluxes
NEXRAD
(NEXt-Generation Weather RADar) - network
of high-resolution Doppler radars operated
by the NWS; NEXRAD units are known as WSR-88D
NGM
(Nested Grid Model) - one of the operational
forecast models run at NCEP; the NGM is run twice
daily, with forecast output out to 48 hours
NIDS
- an acronym for NEXRAD Information Dissemination
Service, which is a system whereby four commercial vendors have the exclusive
right to distribute a certain subset of NEXRAD products to agencies outside
the DoD, NWS, and FAA
Nimbostratus
- a gray colored and often dark cloud,
accompanied by more or less continuously falling rain,
snow, sleet, etc.
and not by lightning, thunder,
or hail
Nitrogen
- a colorless, tasteless, odorless gas
that constitutes 78% of the atmosphere
by volume and occurs as a constituent of all living tissues in combined
form
NMC
- acronym for the National Meteorological Center
near Washington, D.C.; now known as NCEP
NOAA
- acronym for the National
Oceanographic and Atmospheric Administration
Nocturnal
Radiation - see effective
terrestrial radiation
Non-Coherent
Radar - a conventional
radar in which the phase of the transmitted
radiation is not known
Northern
Lights - see Aurora Borealis
Nowcasting
- short-term weather forecasting for the near future, generally
from minutes up to a few hours in the future
NSSFC
- acronym for the old National Severe Storms
Forecast Center in Kansas City, MO; now the Storm
Prediction Center in Norman, OK
NSSL
- acronym for National Severe Storms Laboratory
in Norman, OK
Numerical
Weather Prediction (NWP) - the forecasting of the evolution
of atmospheric disturbances by computational methods on a computer
NWP
- acronym for Numerical Weather Prediction;
see Numerical Weather Prediction
NWS
- acronym for National Weather Service
Nyquist
Velocity - see maximum
unambiguous velocity
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