Subj : Wx Terms (T)(5)
To : All
From : Daryl Stout
Date : Thu Sep 21 2017 12:06 am
TWD
Toward
TWEB
Transcribed Weather Broadcasts - This NWS aviation product is similar to
the Area Forecast (AF) except information is contained in a route format.
Forecast sky cover (height and amount of cloud bases), cloud tops,
visibility (including vertical visibility), weather, and obstructions to
vision are described for a corridor 25 miles either side of the route.
Cloud bases and tops are always Mean Sea Level (MSL) unless noted.
Ceilings are always above ground level.
Twilight
The average time of civil twilight, which is the time between civil dawn
and sunrise in the morning, and between sunset and civil dusk in the
evening.
Twister
In the United States, a colloquial term for a tornado.
Two-Ribbon Flare
In solar-terrestrial terms, a flare that has developed as a pair of
bright strands (ribbons) on both sides of the main inversion ("neutral")
line of the magnetic field of the active region.
Type I, II, III, IV
(In solar-terrestrial terms) -Emissions of the sun in radio wavelengths
from centimeters to dekameters, under both quiet and disturbed
conditions.
Type I. A noise storm composed of many short, narrow-band bursts in the
metric range (300 - 50 MHz).
Type II. Narrow-band emission that begins in the meter range (300 MHz)
and sweeps slowly (tens of minutes) toward deka- meter wavelengths
(10 MHz). Type II emissions occur in loose association with major
FLAREs and are indicative of a shock wave moving through the solar
atmosphere.
Type III. Narrow-band bursts that sweep rapidly (seconds) from decimeter
to dekameter wavelengths (500 - 0.5 MHz). They often occur in groups and
are an occasional feature of complex solar ACTIVE REGIONs.
Type IV. A smooth continuum of broad-band bursts primarily in the meter
range (300 - 30 MHz). These bursts are associated with some major flare
events beginning 10 to 20 minutes after the flare maximum, and can last
for hours.
Typhoon
A tropical cyclone in the Western Pacific Ocean in which the maximum
1-minute sustained surface wind is 64 knots (74 mph) or greater.
Typhoon Season
The part of the year having a relatively high incidence of tropical
cyclones. In the western North Pacific, the typhoon season is from
July 1 to December 15. Tropical cyclones can occur year-round in any
basin.
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