Subj : Wx Terms (E)(1) To : All From : Daryl Stout Date : Mon Nov 06 2017 09:43 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 --- þ Synchronet þ The Thunderbolt BBS - wx1der.dyndns.org .