Zulu time; the same as Universal Coordinated Time (UTC), i.e. 18z is the same as 18:00 UTC.
- Browse Related Terms: Climate Diagnostics Center, Coordinated Universal Time (UTC), GMT, Intermediate Synoptic Times, Main Synoptic Times, MAINT, NAM, Standard Synoptic Times, Universal Time (UT), UTC, Z, Zulu (Z) Time
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An empirical relationship between radar reflectivity factor z (in mm^6 / m^3 ) and rain rate ( in mm / hr ), usually expressed as Z = A R^b; A and b are empirical constants.
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In hydrologic terms, a reference "zero" elevation for a stream or river gage. This "zero" can be referenced (usually within ten feet of the bottom of the channel) to mean sea level, or to any other recognized datum.
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Zone Forecast Product
- Browse Related Terms: 1-2-3 Rule, AGFS, Complex Gale/Storm, CWFA, Developing Gale/Storm, FA, FCST, FOUS, Grids, High Seas Forecast, Marine Zone, NSSFC, OFSHR, PROGGED, Radar Meteorology, RAFC, RAFS, Red Flag Warning, TAF, Valid Time, ZFP
Freezing Drizzle
- Browse Related Terms: Accretion, DZ, Freezing Drizzle, Freezing Rain, Frost Point, Frozen Dew, FRZ, Melting Point, Permafrost, Supercool, ZL
zones
- Browse Related Terms: Dst Index, High Latitudes, Ionospheric Storm, Middle Latitudes, REF, Sea Surface Temperatures, ZNS
Large-scale atmospheric flow in which the east-west component (i.e., latitudinal) is dominant. The accompanying meridional (north-south) component often is weaker than normal. Compare with meridional flow.
- Browse Related Terms: LAT, Latitude, longitude, Meridional Flow, Mid-Latitude Areas, Quadrature, Zonal Flow
In hydrologic terms, the locus of points just above the water table where soil pores may either contain air or water. This is also called the vadose zone
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In hydrologic terms, the locus of points below the water table where soil pores are filled with water. This is also called the phreatic zone
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In hydrologic terms, an embankment dam which is comprised of zones of selected materials having different degrees of porosity, permeability and density.
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Freezing Rain
- Browse Related Terms: FRZN, FZRA, Ice Storm, Mixed precipitation, R, RA, Rain Gauge, ZR
For practical purposes, the same as Coordinated Universal Time (UTC). The notation formerly used to identify time Greenwich MeanTime. The word "Zulu" is notation in the phonetic alphabet corresponding to the letter "Z" assigned to the time zone on the Greenwich Prime Meridian.
- Browse Related Terms: Climate Diagnostics Center, Coordinated Universal Time (UTC), GMT, Intermediate Synoptic Times, Main Synoptic Times, MAINT, NAM, Standard Synoptic Times, Universal Time (UT), UTC, Z, Zulu (Z) Time
In solar-terrestrial terms, a sunspot classification system that has been modified for SESC use.
- Browse Related Terms: Arch Filament System (AFS), Coronal Rain, CRN, fibril, Light Bridge, MDFY, Penumbra, Plage Corridor, Solar Maximum, Solar Minimum, Sunspot Number, surge, Umbra, Zurich Sunspot Classification