National digital forecast database definitions

Apparent Temperature is the perceived temperature derived from either a combination of temperature and wind (Wind Chill) or temperature and humidity (Heat Index) for the indicated hour. Data recovery on android When the temperature at a particular grid point falls to 50 F or less, wind chill will be used for that point for the Apparent Temperature. Icare data recovery 94fbr When the temperature at a grid point rises above 80 F, the heat index will be used for Apparent Temperature. Image database Between 51 and 80 F, the Apparent Temperature will be the ambient air temperature.


Convective Hazard Outlook is a categorical forecast (marginal, slight, enhanced, moderate, or high risk) that specifies the perceived level of threat of thunderstorms, severe thunderstorms, hail, damaging winds, and tornadoes.

Critical Fire Weather delineates areas where pre-existing fuel conditions, combined with forecast weather conditions will result in a significant threat for wildfires. Database web application Two types of areas are specified: critical fire weather areas for wind and relative humidity, and extremely critical fire weather areas for extreme conditions of wind and relative humidity.

Damaging Thunderstorm Wind Probability is the probability (in percent) of winds greater than 58 miles per hour occurring within 25 miles of any point during the outlook period. Database graphic The higher the probability, the higher the threat of severe thunderstorm winds occurring.

Dew Point is the expected dew point temperature for the indicated hour. In databases a category of data is called a Dew point temperature is a measure of atmospheric moisture. Database wordpress It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).

Dry Thunderstorms delineates areas expecting widespread or numerous thunderstorms that produce little wetting rain (<0.10 in) where dried fuels exist.

Extreme Hail Probability is the probability (in percent) of hail greater than 2 inches in diameter within 25 miles of any point during the outlook period. Note 2 data recovery The higher the probability, the higher the threat of extreme hail occurring.

Extreme Thunderstorm Wind Probability is the probability (in percent) of winds greater than 75 miles per hour occurring within 25 miles of any point during the outlook period. Tally erp 9 data recovery The higher the probability, the higher the threat of extreme thunderstorm winds occurring.

Extreme Tornado Probability is the probability (in percent) of Enhanced Fujita scale 2 (EF2) tornadoes occurring within 25 miles of any point during the outlook period. Database erd The higher the probability, the higher the threat of extreme tornadoes.

Forecast of Reference Crop Evapotranspiration (FRET) is the expected depth of water that would evaporate and transpire from a reference crop under the forecast weather conditions on a daily and weekly basis over the next 7 days. Database google docs The FRET is for short crops with an approximate height of 12 cm similar to full cover grasses.

Hail Probability is the probability (in percent) of hail greater than three-quarters of an inch in diameter (size of a penny) occurring within 25 miles of any point during the outlook period. Database 5500 The higher the probability, the higher the threat of severe hail.

Hazards are weather or hydrologic hazardous events issued for the protection of life and property and the enhancement of the national economy. Data recovery kit The hazards grid includes long duration coastal, marine, non-precipitation, tropical, convective, winter weather and some hydrological hazards. Database meaning It does not include some short duration watches and warnings such as Tornado, Severe Thunderstorm, Flash Flood, Gale, and Special Marine Warnings. Gale database See the latest Hazards Product Description Document at: http://www.weather.gov/ndfd/pdd.htm for the latest listing of included hazards and definitions.

Hurricane Threats are the worst-case plausible scenario or threat associated with each of four tropical cyclone hazards: wind, storm surge, flooding rain, and tornadoes.

They convey the threat for the duration of the event, not specific timing. Data recovery pc See the latest Tropical Cyclone Threats Product Description Document at: http://products.weather.gov/PDD/TCThreatGridsNDFD.pdf for the listing and description of the included threats.

Precipitation Amount is the expected quantity of liquid precipitation accumulated over a six hourly period. Data recovery easeus A quantitative precipitation forecast (QPF) will be specified when a measurable ( 1/100th of an inch or more) precipitation type is forecast for any hour during a QPF valid period. Top 10 data recovery software NDFD valid periods for QPF are 6 hours long beginning and ending at 0000, 0600, 1200 and 1800 UTC. Database oracle QPF includes the liquid equivalent amount for snow and ice.

Probability of Precipitation (PoP12) is the likelihood, expressed as a percent, of a measurable precipitation event (1/100th of an inch or more) at a grid point during the 12-hour valid period. Data recovery services reviews The 12-hour valid periods begin and end at 0000 and 1200 Coordinated Universal Time (UTC).

Precipitation Potential Index (PPI) is a means to show confidence as to the location of precipitation at each forecast time across the forecast area. Database 12c new features PPI values range from 0 to 100 and resemble PoP12 values in magnitude. Database lyrics The PoP12 for any 12- hour period can be derived by taking the maximum PPI value within the desired period.

Relative Humidity is a ratio, expressed as a percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated. Database 360 Since the latter amount is dependent on temperature, relative humidity is a function of both moisture content and temperature.

Snow Amount is the expected total accumulation of new snow during a 6 hour period. Database architect salary A snow accumulation grid will be specified whenever a measurable snowfall is forecast for any hour during a valid period. Database administrator job description Valid periods for the NDFD begin and end at 0600, 1200, 1800, and 0000 UTC.

Tornado Probability is the probability (in percent) of a tornado occurring within 25 miles of any point during the outlook period. Data recovery app The higher the probability, the higher the threat of tornadoes occurring.

Total New Precipitation is the sum of all forecast six hourly liquid precipitation amounts prior to the indicated hour. R database connection This total includes the liquid equivalent amount for snow and ice.

Total Probability of Extreme Severe Thunderstorms is the probability in percent of EF2 (Enhanced Fujita scale 2) tornadoes, damaging winds with speeds greater than 75 miles per hour, or large hail two inches or greater in diameter occurring within 25 miles of any point during the outlook period.

Total Probability of Severe Thunderstorms is the probability in percent of tornadoes, damaging winds with speeds greater than 58 miles per hour, or large hail three quarters of an inch in diameter (penny-size) occurring within 25 miles of any point during the outlook period.

Tropical Cyclone Surface Wind Speed Probability (Cumulative) is the probability (in percent) of sustained surface wind speed greater than 34-, 50- and 64-knots (3 separate elements) sometime during the specified cumulative forecast period (0 – 6 hours, 0-12, 0-18, etc.) at each specific point. Database weak entity NOTE: This element is provided for coastal and inland points as well as offshore locations (e.g., buoys).

Tropical Cyclone Surface Wind Speed Probability (Incremental) is the probability (in percent) of sustained surface wind speed greater than 34-, 50-, and 64-knots (3 separate elements) sometime during the specified forecast period (0 – 6 hours, 6 -12, 12 -18, etc.) at each specific point. Data recovery vancouver These values are incremental since they can increase in value by accounting for the possibility the event might start in an earlier period and still be occurring in the specified period. Level 3 data recovery NOTE: This element is provided for coastal and inland points as well as offshore locations (e.g., buoys).

Wave Height is the average height (from trough to crest) of the one-third highest waves valid for the top of the designated hour. Database blob Wave Height is a combination of wind waves and swell.

Weather is the expected weather (precipitating or non-precipitating) valid at the indicated hour. Database examples Precipitating weather includes type, probability, and intensity information. Database knowledge In cases of convective weather, coverage may be substituted for probability.

Wind Direction & Speed Wind direction is the expected sustained 10-meter wind direction for the indicated hour, using 36 points of a compass. H2 database Wind Speed is the expected sustained 10-meter sustained wind speed for the indicated hour. Nexus 5 data recovery Wind barbs (shown below) are used to denote wind speed and direction.

Wind Gust is the maximum 3-second wind speed forecast to occur within a 2-minute interval at a height of 10 meters. Data recovery uk Wind gust forecasts are valid at the top of the indicated hour.

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