Subj : Wx Terms (R)(5)
To : All
From : Daryl Stout
Date : Sun Nov 19 2017 12:05 am
Rope Cloud
In satellite meteorology, a narrow, rope-like band of clouds sometimes
seen on satellite images along a front or other boundary. The term
sometimes is used synonymously with rope or rope funnel.
Rope Stage
The dissipating stage of a tornado, characterized by thinning and
shrinking of the condensation funnel into a rope (or rope funnel).
Damage still is possible during this stage.
ROSA
Remote Observing System Automation. A type of automated data transmitter
used by NWS Cooperative Program observers.
Rossby Waves
A series of troughs and ridges on quasi-horizontal surfaces in the major
belt of upper tropospheric westerlies. The waves are thousands of
kilometers long and have significant latitudinal amplitude.
Rotation
The spinning of a body, such as the earth, about its axis.
ROTG
Rotating
Rotor Cloud
A turbulent altocumulus cloud formation found in the lee of some mountain
barriers when winds cross the barrier at high speed. The air in the cloud
rotates around an axis parallel to the range. Also called a roll cloud.
Rotten Ice
In hydrologic terms, ice in an advanced stage of disintegration.
Rough Seas
Sea conditions associated with regionally defined wind thresholds over
bays, inlets, harbors, inland waters, and estuaries where larger waves
are forming with whitecaps and spray everywhere.
Routing
In hydrologic terms, the methods of predicting the attenuation of a flood
wave as it moves down the course of a river.
RPD
Rapid
RPLC
Replace
RPRT
Report
RQR
Require
RRQ
Right Rear Quadrant - the area upstream from and to the right of an
upper-level jet max (as would be viewed looking along the direction of
flow). Upward motion and severe thunderstorm potential sometimes are
increased in this area relative to the wind speed maximum. See also exit
region, left front quadrant.
RSG
Rising
RSN
Reason
RTE
Route
RTRD
Retard
RTRN
Return
RTVS
Real Time Verification System
RUC
Rapid Update Cycle model, a numerical model run by NCEP that focuses on
short-term forecasts out to 12 hours.
Runoff
In hydrologic terms, the part of precipitation that flows toward the
streams on the surface of the ground or within the ground. Runoff is
composed of baseflow and surface runoff.
Runway Visual Range
The maximum distance at which the runway, or the specified lights or
markers delineating it, can be seen from a position above a specified
point on its center line. This value is normally determined by
visibility sensors located alongside and higher than the center line
of the runway. RVR is calculated from visibility, ambient light level,
and runway light intensity.
RVA
River Summary, a NWS summary of river and/or crest stages for selected
forecast points along the river.
RVF
River Forecast. An internal product issued by RFCs to other NWS offices.
An RVF contains stage and/ or flow forecasts for specific locations
based on existing, and forecasted hydrometeorologic conditions. The
contents of these products are used by the HSA office to prepare Flood
Warnings (FLW), Flood Statements (FLS), River Statements (RVS), as well
as other products available to the public.
RVI
River Ice Statement
RVR
1. Runway Visual Range - the maximum distance at which the runway, or the
specified lights or markers delineating it, can be seen from a position
above a specified point on its center line. This value is normally
determined by visibility sensors located alongside and higher than the
center line of the runway. RVR is calculated from visibility, ambient
light level, and runway light intensity.
2. River
RVS
1. Abbreviation for "revise"
2. River Statement, a product issued to communicate notable hydrologic
conditions which do not involve flooding, i.e., within river bank rises,
minor ice jams, etc.
RW
Rainshower
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