Search Results

You are looking at 1 - 10 of 5,087 items for :

  • Forecasting techniques x
  • Monthly Weather Review x
  • Refine by Access: All Content x
Clear All
Craig H. Bishop, Teddy R. Holt, Jason Nachamkin, Sue Chen, Justin G. McLay, James D. Doyle, and William T. Thompson

resolution-dependent initial condition perturbations but easily could if the adjoint of a nested model was available. The breeding ensemble generation technique ( Toth and Kalnay 1993 , 1997 ) when applied to the mesoscale ( Stensrud et al. 1999 ) creates mesoscale analysis perturbations from mesoscale forecast perturbations and hence, in principle, provides initial condition perturbations at all scales resolved by the limited-area model (LAM). However, as pointed out by Wang and Bishop (2003) , the

Full access
Austin Coleman and Brian Ancell

value and cost exponentially more in terms of computational resources ( Kain et al. 2008 ). Thus, horizontal grid spacings of 2–4 km are common in operational ensemble systems to provide valuable probabilistic forecast guidance for severe convection. While model physics improvements, high resolution, and advancements in data assimilation techniques benefit the predictability of the atmosphere generally, other postprocessing techniques that harness ensemble information specific to various high

Restricted access
Naila F. Raboudi, Boujemaa Ait-El-Fquih, Clint Dawson, and Ibrahim Hoteit

produced using the ensemble prediction system (EPS) technique ( Heaps 1983 ; Buizza and Palmer 1995 ; Buizza et al. 1999 ). Based on the chaos theory describing systems’ behavior that are highly sensitive to the initial conditions, the method assesses uncertainty in forecasts by considering a set of different forecasts based on a set of different initial conditions, instead of a single “deterministic” forecast ( Mel and Lionello 2014a , b , 2016 ). These initial conditions are designed to include

Full access

howthe synoptic analysis of these vectors may be used for 'quantitative precipitation forecasting. An example of thevector field and the precipitation forecast is given. Although the prognosticformuladoes not give correct pointvalues of the precipitation, reasonably good agreement is found between the distributions of forecast and observedprecipitation. The technique is probably too laborious for daily forecasting routine but may be useful in the evalu-ation of rainmaking experiments

Full access
Lance M. Leslie and Greg J. Holland

FEBRUARY 1991 LANCE M. LESLIE AND GREG J. HOLLAND 425Predicting Regional Forecast Skill Using Single and Ensemble Forecast Techniques LANCE M. LESLIE AND GREG J. HOLLANDBureau of Meteorology Research Centre, Melbourne, Australia(Manuscript received 4 May 1990, in final form 25 August 1990) ABSTRACT The potential for predicting the skill of 36-h forecasts from the Australian region limited

Full access
A. N. Seidman

VOL. IO9~NO. 7 MONTHLY WEATHER REVIEW JULY 1981Averaging Techniques in Long-Range Weather Forecasting A. N. SEIDMANThe Aerospace Corporation, P.O. Box 92937, Los Angeles, CA 90009(Manuscript received 3 June 1980, in final form 30 December 1980)ABSTRACT A method is investigated for increasing the length of prediction time for intermediate-range forecasting(up to 30 days). The method

Full access
Alexander Kann, Christoph Wittmann, Yong Wang, and Xulin Ma

procedure A variety of methods exists for statistical adaptation of the direct model output of ensemble forecasts. Focusing especially on severe weather, the parameters of primary interest for statistical calibration are precipitation, 10-m wind speed, and 2-m temperature. As the observed relative frequency of precipitation is characterized by a high degree of skewness, logistic regression techniques are found to be adequate for many applications ( Hamill et al. 2008 ). In case of wind speed

Full access
Andrew R. Lawrence and James A. Hansen

forecast’s utility is its relatively small size. This paper presents an approach to increase forecast ensemble size using lagged ensemble forecasts that have been transformed to account for all observations that have become available since the forecasts were launched. This transformed lagged ensemble forecasting (TLEF) technique is equally valid for single-model and multimodel ensembles, but the technique introduced here places emphasis on the single-model case in the context of an idealized model

Full access
Andrew J. Condon, Y. Peter Sheng, and Vladimir A. Paramygin

which can be important. As pointed out by Rego and Li (2009) and Jelesnianski (1972) , neglecting the forward speed and angle of approach may not be appropriate as there is a “critical motion relative to a coast that gives the highest possible surge.” Additionally the technique does not account for tides and wave setup, which can contribute significantly to the surge and inundation. This paper addresses the rapid generation of high-resolution probabilistic inundation forecasts. The optimal storm

Full access

540MONTHLY WEATHER REVIEWVal. 96, No. 8A REVISED TECHNIQUE FOR FORECASTING HURRICANE MOVEMENT BY STATISTICAL METHODSBANNER 1. MILLER*, ELBERT C. HILL**, and PETER P. CHASE**National Hurricane Research Laboratory and **National Hurricane Center, ESSA, Miami, Fla.ABSTRACTThe NHC-64 statistical equations for predicting the movement of hurricanes have been in operational use for 4 yr.These equations have continued to perform well. Following the 1966 hurricane season, however, it

Full access