Subj : Wx Terms (E)(1)
To : All
From : Daryl Stout
Date : Fri Oct 06 2017 12:07 am
E
East
E REGION
In solar-terrestrial terms, a daytime layer of the earth's ionosphere
roughly between the altitudes of 85 and 140 km.
E-19, Report on River Gage Station
In hydrologic terms, a report to be completed every 5 years providing a
complete history of a river station and all gages that have been used for
public forecasts since the establishment of the station.
E-19a, Abridged Report on River Gage Sta
In hydrologic terms, an abridged version of an E-19, an E-19a updates the
E-19 as additional information, or changes occur at the station during the
intervening five year period. An E-19a is to be completed anytime a
significant change occurs at a forecast point. An E-19a is also used to
take the place of an E-19 in documenting any gage history, or information
of any non-forecast point (i.e; data point).
E-3, Flood Stage Report
In hydrologic terms, a form that a Service Hydrologist/ Hydrology Focal
Point completes to document the dates in which forecast points are above
flood stage, as well as the crest dates and stages. Discussion of the
flood event must also be included in the E-5, Monthly Report of River and
Flood conditions. An E-3 report is sent to Regional Headquarters, the
appropriate RFC, as well as the Office of Hydrology (OH).
E-5, Monthly Report of River and Flood c
In hydrologic terms, a monthly narrative report covering flooding which
occurred over the past month. Flood stage, flood crest and dates in which
flooding occurred is covered within this report for each data point which
was in flood. If the flooding involved a forecast point, an E-3 must be
filled out as well. If no flooding has occurred within the past month, a
climatic summary of the past month can be included as well as other
interesting non-flood events, such as water supply, ice jams and the
occurrence of drought. An E-5 report is sent to Regional Headquarters,
the appropriate RFC, as well as the Office of Hydrology (OH).
E-7, Flood Damage Report
In hydrologic terms, a report to be completed anytime there is reported
flood damage or loss of life as a direct result of flooding. An E-7 report
is sent to Regional Headquarters, as well as the Office of Hydrology (OH).
Easterlies
Any winds with components from the east.
Ebb Current
The movement of a tidal current away form the coast or down an estuary.
EBND
Eastbound
EBS
Emergency Broadcast System
Eccentricity
A dimensionless quantity describing the elliptical shape of a planet's
orbit.
Echo
Energy back scattered from a target (precipitation, clouds, etc.) and
received by and displayed on a radar screen.
Echo Tops
The height above ground of the center of the radar beam using the tilt,
or scan, that contains the highest elevation where reflectivities greater
than 18 dBZ can be detected.
ECMF
European Center for Meteorology Forecast model.
ECMWF
European Center for Medium-Range Weather Forecasts. Operational
references in forecast discussions typically refer to the ECMWF's
medium-range numerical forecast model, which runs out to 10 days.
Eddy
Swirling currents of air at variance with the main current.
EDT
Eastern Daylight Time
EFCT
Effect
Effective Porosity
In hydrologic terms, the ratio, usually expressed as a percentage, of
the volume of water or other liquid which a given saturated volume of
rock or soil will yield under any specified hydraulic condition, to the
given volume of soil or rock.
Effective Precipitation
1) That part of the precipitation that produces runoff.
2) A weighted average of current and antecedent precipitation that is
"effective" in correlating with runoff.
3) That part of the precipitation falling on an irrigated area that is
effective in meeting the consumptive use requirements.
Effective Terrestrial Radiation
The difference between upwelling infrared or terrestrial radiation
emitted from the earth and the downwelling infrared radiation from the
atmosphere.
Effective Topography
The topography as seen by an approaching flow, which may include not
only the actual terrain but also cold air masses trapped within or
adjacent to the actual topography.
Effluent Seepage
In hydrologic terms, diffuse discharge of ground water to the ground
surface.
Effluent Stream
In hydrologic terms, any watercourse in which all, or a portion of the
water volume came from the Phreatic zone, or zone of saturation by way
of groundwater flow, or baseflow.
El Ni�o
A warming of the ocean current along the coasts of Peru and Ecuador
that is generally associated with dramatic changes in the weather
patterns of the region; a major El Ni�o event generally occurs every
3 to 7 years and is associated with changes in the weather patterns
worldwide.
Element
One of the basic conditions of the atmosphere discussed in this FMH
(wind, visibility, runway visual range, weather, obscurations, sky
condition, temperature and dewpoint, and pressure). See parameter.
ELEV
Elevation
Elevated Convection
Convection occurring within an elevated layer, i.e., a layer in which
the lowest portion is based above the earth's surface. Elevated
convection often occurs when air near the ground is relatively cool
and stable, e.g., during periods of isentropic lift, when an unstable
layer of air is present aloft.
In cases of elevated convection, stability indices based on near-surface
measurements (such as the lifted index) typically will underestimate the
amount of instability present. Severe weather is possible from elevated
convection, but is less likely than it is with surface-based convection.
ELSW
Elsewhere
ELY
Easterly
Embankment
In hydrologic terms, fill material, usually earth or rock, placed with
sloping sides and usually with length greater than height. All dams are
types of embankments.
EMBDD
Embedded
EMC
Environmental Modeling Center
Emergency Action Plan
In hydrologic terms, a predetermined plan of action to be taken to reduce
the potential for property damage and loss of life in an area affected by
a dam break or excessive spillway.
Emergency Services
In hydrologic terms, services provided in order to minimize the impact of
a flood that is already happening. These measures are the responsibility
of city, or county emergency management staff and the owners or operators
of major, or critical facilities. Some examples of emergency services are
flood warning and evacuation, flood response, and post flood activities.
Emerging Flux Region (EFR)
In solar-terrestrial terms, an area on the sun where new magnetic flux is
erupting.
Emissivity
The ability of a surface to emit radiant energy compared to that of a
black body at the same temperature and with the same area.
EML
Elevated Mixed Layer
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