Subj : Wx Terms (E)(3)
To   : All
From : Daryl Stout
Date : Sun Aug 06 2017 12:06 am

Eruptive
In solar-terrestrial terms, solar activity levels with at least one
radio event (10 cm) and several chromospheric events per day (Class C
Flares).

Eruptive Prominence on Limb (EPL)
In solar-terrestrial terms, a solar prominence that becomes activated
and is seen to ascend from the sun.

ESP
Extended Streamflow Prediction

EST
Eastern Standard Time

Estuary
In hydrologic terms, the thin zone along a coastline where freshwater
systems and rivers meet and mix with a salty ocean (such as a bay, mouth
of a river, salt marsh, lagoon).

Esturine waters
In hydrologic terms, deepwater tidal habitats and tidal wetlands that are
usually enclosed by land but have access to the ocean and are at least
occasionally diluted by freshwater runoff from the land (such as bays,
mouths of rivers, salt marshes, lagoons).

Esturine Zone
In hydrologic terms, the area near the coastline that consists of
esturaries and coastal saltwater wetlands.

ETA

1. The Eta Model, now referred to as North Amercian Meso (NAM) an
84-hour numerical model of the atmosphere run four times daily by NCEP.
This is one of the main forecast models used for short-term weather
prediction in the United States.

2. Estimated Time of Arrival

Eta Model

Now referred to as North Amercian Meso (NAM) is one of the operational
numerical forecast models run at NCEP. The Eta is run four times daily,
with forecast output out to 84 hours.

Evaporation
The process of a liquid changing into a vapor or gas, usually water in
meteorology.

Evaporation Pan
In hydrologic terms, a pan used to hold water during observations for
the determination of the quantity of evaporation at a given location.
Such pans are of varying sizes and shapes, the most commonly used being
circular or square.

Evaporation Rate
In hydrologic terms, the quantity of water, expressed in terms of depth
of liquid water, which is evaporated from a given surface per unit of
time. It is usually expressed in inches depth, per day, month, or year.

Evaporation-mixing Fog
Fog that forms when the evaporation of water raises the dew point of the
adjacent air.

Evaporimeter
In hydrologic terms, an instrument which measures the evaporation rate
of water into the atmosphere.

Evapotranspiration
Combination of evaporation from free water surfaces and transpiration
of water from plant surfaces to the atmosphere.

EVE
Evening

EWD
Eastward

EWW
Extreme Wind Warning (EWW) inform the public of the need to take
immediate shelter in an interior portion of a well-built structure due
to the onset of extreme tropical cyclone winds. An EWW for extreme
tropical cyclone winds should be issued when both of the following
criteria are met:

a. Tropical cyclone is a category 3 or greater on the Saffir Simpson
hurricane scale as designated by NHC, CPHC or JTWC.

b. Sustained tropical cyclone surface winds of 100 knots (115 mph) or
greater are occurring or are expected to occur in a WFO's county
warning area within one hour.

Excess Rain
In hydrologic terms, effective rainfall in excess of infiltration
capacity.

Excessive Heat
Excessive heat occurs from a combination of high temperatures
(significantly above normal) and high humidities. At certain levels,
the human body cannot maintain proper internal temperatures and may
experience heat stroke. The "Heat Index" is a measure of the effect of
the combined elements on the body.

Excessive Heat Outlook
This CPC product, a combination of temperature and humidity over a
certain number of days, is designed to provide an indication of areas
of the country where people and animals may need to take precautions
against the heat during May to November.

Excessive Heat Warning
Issued within 12 hours of the onset of the following criteria: heat
index of at least 105�F for more than 3 hours per day for 2
consecutive days, or heat index more than 115�F for any period of
time.

Excessive Heat Watch
Issued by the National Weather Service when heat indices in excess of
105�F (41�C) during the day combined with nighttime low temperatures of
80�F (27�C) or higher are forecast to occur for two consecutive days.

EXCLD
Exclude

Exclusive Flood Control Storage Capacity
In hydrologic terms, the space in a reservoir reserved for the sole
purpose of regulating flood inflows to abate flood damage.

Exit Region
The region downstream from a wind speed maximum in a jet stream
(jet max), in which air is moving away from the region of maximum winds,
and therefore is decelerating. This deceleration results in divergence
in the upper-level winds in the left half of the exit region (as would
be viewed looking along the direction of flow).

This divergence results in upward motion of air in the left front
quadrant (or left exit region) of the jet max. Severe weather potential
sometimes increases in this area as a result. See also entrance region,
right entrance region.

Exosphere
The upper most layer of the earth's atmosphere; the only layer where
atmospheric gases can escape into outer space.

Experimental Product
An experimental product is in the final stages of testing and evaluation.
If the product proves accurate and valuable to users then the next step
is to make it an operational product.

Explosive Deepening
A decrease in the minimum sea-level pressure of a tropical cyclone of
2.5 mb/hr for at least 12 hours or 5 mb/hr for at least six hours.

EXTD
Extend/Extended

Extended Forecast Discussion
This discussion is issued once a day around 2 PM EST (3 PM EDT) and is
primarily intended to provide insight into guidance forecasts for the
3 to 5 day forecast period. The geographic focus of this discussion is
on the United States (including Alaska and Hawaii). Although portions
of this narrative will parallel the Hemispheric Map Discussion, a much
greater effort is made to routinely relate the model forecasts and
necessary modifications to weather forecasts, mainly in terms of
temperature and precipitation.

Extraterrestrial Radiation
The theoretically-calculated radiation flux from the sun at the top of
the atmosphere, before losses by atmospheric absorption.

Extratropical
A term used in advisories and tropical summaries to indicate that a
cyclone has lost its "tropical" characteristics. The term implies both
poleward displacement of the cyclone and the conversion of the
cyclone's primary energy source from the release of latent heat of
condensation to baroclinic (the temperature contrast between warm and
cold air masses) processes. It is important to note that cyclones can
become extratropical and still retain winds of hurricane or tropical
storm force.

Extratropical Cyclone
A cyclone in the middle and high latitudes often being 2000 kilometers
in diameter and usually containing a cold front that extends toward the
equator for hundreds of kilometers.

Extratropical Low
A low pressure center which refers to a migratory frontal cyclone of
middle and higher latitudes. Tropical cyclones occasionally evolve into
extratropical lows losing tropical characteristics and become associated
with frontal discontinuity.



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