Search Results

You are looking at 201 - 210 of 1,283 items for :

  • Operational forecasting x
  • Journal of Atmospheric and Oceanic Technology x
  • Refine by Access: All Content x
Clear All
Skylar S. Williams, Timothy J. Wagner, and Ralph A. Petersen

that WVSS are compatible and agree well with operational radiosonde observations over the CONUS throughout the entire troposphere. WVSS observations have already been found to be impactful for forecasters and NWP. Hoover et al. (2017) found the assimilation of AMDAR moisture observations improved forecasts and the observation-minus-background bias and RMSE was lowered in the warm season experiment and James and Benjamin (2017) found that aircraft water vapor observations from WVSS were

Restricted access
Mario Adani, Srdjan Dobricic, and Nadia Pinardi

carried out for the time period of 1985–2007 using all of the available historical in situ and satellite data and the operational forecasting model calibrated and validated over the past 10 yr ( Pinardi et al. 2003 ; Tonani et al. 2008b ). The Mediterranean Sea is a semienclosed sea located between 5°E and 36°W and between 32° and 46°N with average depth of 1500 m. It communicates with the Atlantic through the Strait of Gibraltar and with the Marmara Sea through the Dardanelles. The Mediterranean

Full access
Kun Tao and Ana P. Barros

in general, we focus here on summertime convective rainfall, which is characterized by high space–time variability and thus poses an additional challenge because of limited temporal sampling (i.e., satellite revisit times). In addition, the operational skill scores for areal QPE and quantitative precipitation forecasting (QPF) for this type of rainfall remain very low and have yet to beat persistence at the time scales and for rainfall amounts that matter for hazard warning in practice (e

Full access
Pekka J. Rossi, Vesa Hasu, Kalle Halmevaara, Antti Mäkelä, Jarmo Koistinen, and Heikki Pohjola

infrastructure makes it possible to develop information sources of completely new kinds and methods for protecting us against severe weather hazards. For example, in nowcasting, the knowledge of hazardous events caused by a certain convective storm would help in warning people. Typically, severe weather warnings are part of operational weather services. Quite often, meteorologists take care of general weather forecasts and warnings. In some cases, depending on local resources and susceptibility to severe

Full access
M. K. Rama Varma Raja, Seth I. Gutman, James G. Yoe, Larry M. McMillin, and Jiang Zhao

vapor retrievals in operational weather forecast models. GPS observation errors have been quantified ( Smith et al. 2007 ), and these observations are currently being assimilated into two operational weather models running at the National Centers for Environmental Prediction (NCEP), the Rapid Update Cycle (RUC) and the North American Mesoscale (NAM) models. In this investigation, GPS IPW retrievals represent a volume-averaged estimate of IPW over the region of the atmosphere covered by all GPS

Full access
Rod Frehlich

1. Introduction Improved short-term forecasts of winds from an operational numerical weather prediction (NWP) system would benefit current wind farms ( Mueller et al. 2003 ; Benjamin et al. 2004 ; Saxen et al. 2008 ; Hannon et al. 2008 ; Benjamin et al. 2010 ; Marquis et al. 2011 ). The output power of a wind turbine is determined by the wind profile over the altitude range of the turbine blades. Using just the wind speed at hub height provides an acceptable calculation of power production

Full access
Timothy J. Wagner and Jessica M. Kleiss

Assessment Report (AR5), which notes that they remain the single greatest source of uncertainty in estimating the magnitude of changes to the energy budget of the planet ( Boucher et al. 2013 ). It is readily apparent that the accuracy of the simulations performed in weather and climate models fundamentally depends on the ability to properly model clouds and their impacts. While certain cloud species are large enough to be resolved by the current generation of operational weather forecast models, other

Full access
G. R. Halliwell Jr., A. Srinivasan, V. Kourafalou, H. Yang, D. Willey, M. Le Hénaff, and R. Atlas

-resolution coastal models nested within it that will all employ realistic high-frequency river runoff ( Schiller et al. 2011 ) for the purpose of evaluating coastal ocean observing systems. c. Evaluation of the T-SIS DA methodology Before conducting the OSSE system evaluation, the performance of the new T-SIS DA methodology is analyzed in comparison to two operational HYCOM Navy Coupled Ocean Data Assimilation (NCODA) ocean analysis products produced by the U.S. Navy using the operational HYCOM nowcast–forecast

Full access
Emmanouil N. Anagnostou and Witold F. Krajewski

observations span the period of two months: 3 August–30 September 1995. During this period, Hurricane Erin and Tropical Storm Jerry passed over the area. The algorithm-generated rain products are compared against the operational WSR-88D Precipitation Processing Subsystem (PPS) estimates ( Fulton et al. 1998 ). These comparisons are used to demonstrate relative improvements coming from the various components of the algorithm with respect to the operational PPS. Improvement is quantified in terms of the

Full access
Philipp M. Kostka, Martin Weissmann, Robert Buras, Bernhard Mayer, and Olaf Stiller

. Meteorological model and data The forecast fields used to simulate synthetic satellite images are produced by the COSMO community model ( Baldauf et al. 2011 ). The COSMO model has been used for operational numerical weather prediction at DWD since 1999. The convection-permitting model configuration COSMO-DE has been operational since April 2007. The model domain has a horizontal grid spacing of 2.8 km and consists of 421 × 461 grid points. The area covers Germany, as well as Switzerland, Austria, and parts

Full access