Subj : Wx Terms (S)(11)
To   : All
From : Daryl Stout
Date : Thu Jul 20 2017 12:05 am

Swell Direction
The direction from which the swells are propagating.

SWH
On a buoy report, swell height is the vertical distance (meters)
between any swell crest and the succeeding swell wave trough.

SWLY
Southwesterly

SWODY1
The Day-1 Convective Outlook, sometimes called the "AC" is a guidance
product issued by the Operational Guidance Branch (OGB) unit of the
Storm Prediction Center (SPC) in Norman, Oklahoma. The Day 1 outlook
outlines areas in the continental United States where severe
thunderstorms may develop during the next 6 to 30 hours.

SWODY2
The Day 2 Convective Outlook is very similar to the Day 1 Outlook. It
is issued only twice a day, at 08Z and 18Z, and covers the period from
12Z the following day to 12Z the day after that. For example, if today
is Monday then the Day 2 Outlook will cover the period 12Z Tuesday to
12Z Wednesday. The outlook issued at 08Z now qualifies the degree of
risk like the Day 1 has (i.e. SLGT, MDT, and HIGH risk areas). The Day 2
Outlook has also includes a general thunderstorm outline.

SWP
On a buoy report, Swell Period is the time (usually measured in seconds)
that it takes successive swell wave crests or troughs pass a fixed point.

SWRN
Southwestern

SWS
Severe Weather Statement

SWWD
Southwestward

SX
Stability Index

SXN
Section

Symmetric Double Eye
A concentrated ring of convection that develops outside the eye wall in
symmetric, mature hurricanes. The ring then propagates inward and leads
to a double-eye. Eventually, the inner eye wall dissipates while the
outer intensifies and moves inward.

Synchronous Detection
Radar processing that retains the received signal amplitude and phase but
that removes the intermediate frequency carrier.

SYNOP
Synoptic - relating to the general weather pattern over a wide region,
such as areas of high and low pressure or frontal boundaries, as opposed
to mesoscale or smaller features such as a thunderstorm.

Synopsis
A broad discussion of the weather pattern expected across any given area,
generally confined to the 0-48 hour time frame.

Synoptic Code
Rules and procedures established by the World Meteorological
Organization (WMO) for encoding weather observations.

Synoptic Scale
The spatial scale of the migratory high and low pressure systems of the
lower troposphere, with wavelengths of 1000 to 2500 km.

Synoptic Track
Weather reconnaissance mission flown to provide vital meteorological
information in data sparse ocean areas as a supplement to existing
surface, radar, and satellite data. Synoptic flights better define the
upper atmosphere and aid in the prediction of tropical cyclone
development and movement.

Synoptic Weather
Weather occurring over a wide region on time scales exceeding 12 hours.

SYNS
Synopsis

SYS
System

Syzygy
In solar-terrestrial terms, the instance (new moon or full moon) when
the earth, sun, and moon are all in a straight line.


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