Subj : Wx Terms (W)(3)
To   : All
From : Daryl Stout
Date : Tue Oct 24 2017 12:06 am

Wind Chill Advisory
The National Weather Service issues this product when the wind chill could
be life threatening if action is not taken. The criteria for this warning
varies from state to state.

Wind Chill Factor
Increased wind speeds accelerate heat loss from exposed skin. No specific
rules exist for determining when wind chill becomes dangerous. As a
general rule, the threshold for potentially dangerous wind chill
conditions is about -20�F.

Wind Chill Warning
The National Weather Service issues this product when the wind chill is
life threatening. The criteria for this warning varies from state to state.

Wind Couplet
An area on the radar display where two maximum wind speeds are blowing in
opposite directions.

Wind Direction
The true direction from which the wind is blowing at a given location
(i.e., wind blowing from the north to the south is a north wind). It is
normally measured in tens of degrees from 10 degrees clockwise through
360 degrees. North is 360 degrees. A wind direction of 0 degrees is only
used when wind is calm.

Wind Field
The three-dimensional spatial pattern of winds.

Wind Gust
Rapid fluctuations in the wind speed with a variation of 10 knots or more
between peaks and lulls. The speed of the gust will be the maximum
instantaneous wind speed.

Wind Radii
Term used in National Weather Tropical Cyclone Forecast Advisory products
(TCM). Wind radii are the largest radii of that wind speed found in that
quadrant. Quadrants are defined as NE (0-90), SE (90-180), SW (180-270),
and NW (270-0). As an example, given maximum 34 knot radii to 150 nm at
0 degrees, 90 at 120 degrees, and 40 nm at 260 degrees, the following line
would be carried in the forecast/advisory: 150NE 90SE 40SW 150NW.

Wind Rose
A diagram, for a given locality or area, showing the frequency and strength
of the wind from various directions.

Wind Shear
The rate at which wind velocity changes from point to point in a given
direction (as, vertically). The shear can be speed shear (where speed
changes between the two points, but not direction), direction shear (where
direction changes between the two points, but not speed) or a combination
of the two.

Wind Shear Profile
The change in wind speed and/or direction usually in the vertical. The
characteristics of the wind shear profile are of critical importance in
determining the potential for and type of severe weather.

Wind Shift
A change in wind direction of 45 degrees or more in less than 15 minutes
with sustained wind speeds of 10 knots or more throughout the wind shift.

Wind Shift Line
A long, but narrow axis across which the winds change direction (usually
veer).

Wind Sock
A tapered fabric shaped like a cone that indicates wind direction by
pointing away from the wind. It is also called a "wind cone."

Wind Speed
The rate at which air is moving horizontally past a given point. It may be
a 2-minute average speed (reported as wind speed) or an instantaneous
speed (reported as a peak wind speed, wind gust, or squall).

Wind Waves
Local, short period waves generated from the action of wind on the water
surface (as opposed to swell). Commonly referred to as waves. In a
National Weather Service Coastal Marine Forecast or Offshore Forecast,
wind waves are used when swells are described in the forecast.
or
Waves generated by the local wind blowing at the time of observation.

Windward
The side toward the wind. Compare with leeward.

Windy
20 to 30 mph winds.

WINT
winter

Winter
Typically the coldest season of the year during which the sun is farthest
from overhead. In the Northern Hemisphere, winter customarily includes the
months of December, January and February.

Winter Pool
The pool, or height of the water surface, of a reservoir during the
winter. This pool is usually a specific height and is maintained for the
control of late winter and spring flooding.

Winter Solstice
The time at which the sun is farthest south in the Southern Hemisphere,
on or around December 21.

Winter Storm Warning
This product is issued by the National Weather Service when a winter storm
is producing or is forecast to produce heavy snow or significant ice
accumulations. The criteria for this warning can vary from place to place.

Winter Storm Watch
This product is issued by the National Weather Service when there is a
potential for heavy snow or significant ice accumulations, usually at least
24 to 36 hours in advance. The criteria for this watch can vary from place
to place.

Winter Weather Advisory
This product is issued by the National Weather Service when a low pressure
system produces a combination of winter weather (snow, freezing rain,
sleet, etc.) that present a hazard, but does not meet warning criteria.

Wire Weight Gage
In hydrologic terms, a river gage comprised of a weight which is lowered to
the water level. The weight is attached to a cable; and as the weight is
lowered, a counter indicates the length of cable released. The stage is
determined from the length of cable required to reach the water level.

WK
Weak

WKN
Weaken

WL
Will

WLY
Westerly

WMC
World Meteorological Center(s)

WMO
World Meteorological Organization (UN)

WND
Wind

Wolf Number
A historic term for Sunspot Number. In 1849, R. Wolf of Zurich originated
the general procedure for computing the sunspot number.

Wrapping Gust Front
A gust front which wraps around a mesocyclone, cutting off the inflow of
warm moist air to the mesocyclone circulation and resulting in an occluded
mesocyclone.

WRCC
Western Regional Climate Center

WRM
Warm

WRMFNT
Warm Front

WRN
Western

WRNG
Warning

WSFO
Weather Service Forecast Office

WSHFT
Wind Shift

WSPD
On a buoy report, the wind speed (m/s) averaged over an eight-minute
period for buoys and a two-minute period for land stations. Reported
Hourly.

WSR-57
A NWS Weather Surveillance Radar designed in 1957. It used to be part of
weather radar network. It was replaced by WSR-88D units.

WSR-74
A NWS Weather Surveillance Radar designed in 1974. It used to be part of
weather radar network. It was replaced by WSR-88D units.

WSR-88D
Weather Surveillance Radar - 1988 Doppler; NEXRAD unit.

WSR-88D System
The summation of all hardware, software, facilities, communications,
logistics, staffing, training, operations, and procedures specifically
associated with the collection, processing, analysis, dissemination and
application of data from the WSR-88D unit.



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