A means of avoiding winds associated with a tropical cyclone by taking into account the forecast track error of the National Weather Service over a 10 year period which is approximately 100 nm in 24 hours, 200 nm for 48 hours and 300 nm in 72 hours. The forecast track error is added to the 34 knot wind radii to compute the danger area. The wind radii may be found within Tropical Cyclone Forecast Advisory (TCM) forecasts.
- 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
A statistic that indicates the magnitude of flood which can be expected to occur on average with a frequency of once every 100 years at a given point or reach on a river. The 100-year flood is usually developed from a statistical distribution that is based on historical floods. This is also called a base flood.
- Browse Related Terms: 100-year Flood, 100-year Flood Plain, Base Flood, Channel Routing, DNSTRM, Flood Frequency Curve, Flood Plain, Flood routing, Floodway, Lag, Lakeshore Flood Advisory, Lakeshore Flood Watch, Lakeshore Flooding, routing, Travel Time
The flood plain that would be inundated in the event of a 100-year flood.
- Browse Related Terms: 100-year Flood, 100-year Flood Plain, Base Flood, Channel Routing, DNSTRM, Flood Frequency Curve, Flood Plain, Flood routing, Floodway, Lag, Lakeshore Flood Advisory, Lakeshore Flood Watch, Lakeshore Flooding, routing, Travel Time
Pressure surface (geopotential height) in the troposphere equivalent to about 18,000 feet above sea level. Level of the atmosphere at which half the mass of the atmosphere lies above and half below, as measured in pressure units. This area is important for understanding surface weather, upper air storms tend to be steered in the direction of the winds at this level and are highly correlated with surface weather.
- Browse Related Terms: 500 hPa, 500 mb, Constant Pressure Chart, Engineer's Level, Extraterrestrial Radiation, Isobaric Chart, Isoheight, Lithometeor, Precision, REP, Station pressure, Theodolite, Tides, Upper-air Weather Chart
Pressure surface (geopotential height) in the troposphere equivalent to about 18,000 feet above sea level. Level of the atmosphere at which half the mass of the atmosphere lies above and half below, as measured in pressure units. This area is important for understanding surface weather, upper air storms tend to be steered in the direction of the winds at this level and are highly correlated with surface weather.
- Browse Related Terms: 500 hPa, 500 mb, Constant Pressure Chart, Engineer's Level, Extraterrestrial Radiation, Isobaric Chart, Isoheight, Lithometeor, Precision, REP, Station pressure, Theodolite, Tides, Upper-air Weather Chart
Doppler Radar currently used nationwide by the National Weather Service.
- Browse Related Terms: 88D, AMVER/SEAS, Congressional Organic Act of 1890, NAVTEX Forecast, NOAA Weather Radio, NWR, NWSH, Pan Pan, S-Band Radar, Securite, SIGWX, Wind Waves, WX