Search Results

You are looking at 1 - 10 of 38,824 items for :

  • Forecasting x
  • All content x
Clear All
Victoria Reyes-García, Álvaro Fernández-Llamazares, Maximilien Guèze, and Sandrine Gallois

connection between stargazing and potato planting among Quechua and Aymara farmers. Orlove and his colleagues found that farmers in Peru and Bolivia forecasted the most auspicious time to plant potatoes by looking, around mid-June, at the brightness, apparent size, and position of the Pleiades, one of the brightest star clusters in the Taurus constellation. The dimmer the Pleiades, as determined by their apparent size and brilliance, the less rain in the area to be expected 6 months later. Based on such

Full access
Tsing-Chang Chen, Jenq-Dar Tsay, and Eugene S. Takle

sea breeze. (b) Two tracks of surface stations connected by red lines along the Tanshui (1–6) and Keelung (7–12) River valleys. Surface winds measured at 1200 LST 18 Aug 2005 are displayed as an example to illustrate the sea breezes along these two river valleys, labeled with red lines. The elevation scale of the orography is also added to each panel. To properly manage the water supply, to mitigate traffic hazards, and to reduce air pollution in the Taipei basin, day-ahead forecasts for the

Full access
Ariel F. Stein, Glenn D. Rolph, Roland R. Draxler, Barbara Stunder, and Mark Ruminski

1. Introduction Rolph et al. (2009) introduced the National Oceanic and Atmospheric Administration’s (NOAA) Smoke Forecasting System (SFS), a smoke forecasting tool within the National Weather Service’s (NWS) National Air Quality Forecast Capability (NAQFC) ( Stockwell et al. 2002 ). The SFS, composed of the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) dispersion model ( Draxler and Hess 1997 , 1998 ), the BlueSky framework emission processing ( Larkin et al. 2009 ), and

Full access
David R. Novak, David R. Bright, and Michael J. Brennan

1. Introduction Uncertainty is a fundamental characteristic of hydrometeorological (hydrologic, weather, and seasonal climate) prediction, and is a consequence of the inherent chaotic nature of the atmosphere, inadequate observations, and numerical weather prediction (NWP) deficiencies ( NRC 2006 ). Thus, the assessment and communication of uncertainty is an inherent part of any forecast process. The assessment of uncertainty in modern operational forecasting has largely relied on the use of

Full access
André April

1. Introduction In Canadian waters, forecasting events such as the onset of ice breakup or a marine area being considered open water or bergy water is important to the shipping trade and the Coast Guard for ship routing and icebreaking plans. Bergy water is an area of freely navigable water in which ice of glacier origin is present. Other ice types may be present, although the total concentration of all other ice is less than 1/10. Open water is an area of freely navigable water in which ice is

Full access
Tamara U. Wall, Timothy J. Brown, and Nicholas J. Nauslar

1. Introduction In this paper, we report—using results from qualitative, in-depth interviews with fire practitioners and forecasters—exploration of use of spot weather forecasts (SWFs) by fire practitioners (e.g., burn bosses, incident commanders, and fire management officers) for prescribed burns (utilized as vegetation management treatments). In the United States, prescribed fires on state and federal lands follow a fire prescription plan, which details parameters and implementation

Full access
Witold F. Krajewski, Ganesh R. Ghimire, and Felipe Quintero

1. Introduction In this paper we demonstrate, in a systematic way, that persistence is a hard-to-beat streamflow forecasting method ( Palash et al. 2018 ), a fact well known to operational forecasters. We limit our considerations to real-time forecasting in space and time in a river network. River networks aggregate water flow that originates from the transformation of rainfall and/or snowmelt to runoff. Additional recognition of the importance of river networks stems from the fact that many

Restricted access
Philip A. Lutzak

radar imagery, depending upon the size of the cloud particles (or insects carried aloft), the amplitude of the waves, and their distance from the radar site. Undular bores produce discrete, measureable changes in the lower atmosphere and at the surface, with a notable veering of the wind, rise in barometric pressure, and without decrease in temperature ( Locatelli et al. 1998 ); this allows researchers to identify their passage and, as will be shown, can also be used to forecast their occurrence

Full access
Matthew J. Onderlinde and Henry E. Fuelberg

produced 37 tornadoes ( Vescio et al. 1996 ). Numerous studies have found a strong preference for tornadoes to occur in the right-front quadrant relative to storm motion or relative to true north (these two quadrants often are similar) ( Sadowski 1962 ; Smith 1965 ; Pearson and Sadowski 1965 ; Hill et al. 1966 ; Novlan and Gray 1974 ; Gentry 1983 ; McCaul 1991 ; Verbout et al. 2007 ; Schultz and Cecil 2009 ). When attempting to forecast TC-related severe local storms, McCaul (1991) suggested

Full access
Cristina Primo, Christopher A. T. Ferro, Ian T. Jolliffe, and David B. Stephenson

1. Introduction Probabilistic forecasts represent the uncertainty in a prediction by a probability distribution for the predictand. This distribution may be derived from historical errors of deterministic forecasts or from ensemble forecasts (see Leith 1974 ; Ehrendorfer 1997 ; Stephenson and Doblas-Reyes 2000 , and references therein). In the latter case, probabilistic forecasts for binary events are often obtained as the relative frequency with which the event occurs in the ensemble. For

Full access