Search Results

You are looking at 1 - 10 of 15 items for :

  • Forecasting x
  • International Precipitation Working Group (IPWG) x
  • All content x
Clear All
Alan J. Geer, Peter Bauer, and Christopher W. O’Dell

satellite observations (e.g., Kummerow 1998 ). Here, even when two fields of view contain the same mass of rain or cloud, variations in fractional cloudiness can cause large differences in measured radiances. Rain- and cloud-affected microwave radiances are assimilated at the European Centre for Medium-Range Weather Forecasts (ECMWF; Bauer et al. 2006a , b ), improving forecasts of tropical moisture and wind ( Kelly et al. 2008 ). However, large biases between simulated and observed brightness

Full access
J. J. Shi, W-K. Tao, T. Matsui, R. Cifelli, A. Hou, S. Lang, A. Tokay, N-Y. Wang, C. Peters-Lidard, G. Skofronick-Jackson, S. Rutledge, and W. Petersen

estimation algorithms ( Petersen et al. 2007 ). In this study, the Weather Research and Forecasting model (WRF) with the Goddard microphysics scheme was utilized. WRF has also been coupled with multisensor, multifrequency satellite simulators in the Goddard Satellite Data Simulation Unit (SDSU) for model evaluation and GPM algorithm support. The goal is to combine radar, satellite, and in situ measurements in addition to model data to improve precipitation measurement. The Goddard cloud microphysics

Full access
Frank S. Marzano, Domenico Cimini, Tommaso Rossi, Daniele Mortari, Sabatino Di Michele, and Peter Bauer

function of state. Details on the implementation of the 1D-Var retrieval algorithm will be given in section 3c . b. Millimeter-wave information content analysis Atmospheric profiles were extracted from Cycle31R2 of the European Centre for Medium-Range Weather Forecasts (ECMWF) forecasting system (e.g., Bauer et al. 2006a , b ). The spectral model was truncated at wavenumber 799, which corresponds to a horizontal resolution of 25 km. Vertical resolution is achieved using 91 pressure levels between 0

Full access
M. Tugrul Yilmaz, Paul Houser, Roshan Shrestha, and Valentine G. Anantharaj

from the radar, spurious echoes resulting from anomalous propagation of the radar beam, brightband contamination, and scatter from ground-clutter targets. Precipitation forecasts by numerical models are not observed data, although they may assimilate observations such as radiosonde profiles, cloudiness, satellite temperatures, and so on. Numerical models may produce high-quality precipitation distributions in their analyses and short-range forecasts but less-skillful simulations over tropical areas

Full access
Jonathan J. Gourley, Yang Hong, Zachary L. Flamig, Li Li, and Jiahu Wang

propagation. The rainfall estimates from adjacent radars are then merged onto the same 4.76-km grid as the Gauge using an inverse distance-weighting scheme. The NCEP hourly multisensor precipitation analysis, or Stage IV hereinafter, combines rainfall estimates from WSR-88D radar, rain gauges, and satellite, with quality control performed manually by NWS forecasters. The NCEP Stage IV product is a mosaic of multisensor rainfall products produced by the individual River Forecast Centers (RFCs). Additional

Full access
Feyera A. Hirpa, Mekonnen Gebremichael, and Thomas Hopson

1. Introduction The availability of high-resolution satellite precipitation products has made them very attractive for hydrological applications in regions that have less-dense and less-consistent ground-based measurements. Some of these products are available in (near) real time, making them suitable for flood-forecasting applications. The concept behind these high-resolution satellite precipitation algorithms is to combine information from the more accurate (but infrequent) microwave (MW

Full access
Ali Behrangi, Koulin Hsu, Bisher Imam, and Soroosh Sorooshian

products that use VIS bands are not necessarily adequate for the development of long-term precipitation climatology. Operational hydrologists and flood forecasters, on the other hand, are very interested in improving the accuracy of real-time rain-rate estimates and the ability to accurately identify the areal extent of precipitation at any time. As such, it is likely that they will welcome any improvement, whether it is at daytime, nighttime, or both. 6. Summary and conclusions In this paper, two of

Full access
Hilawe Semunegus, Wesley Berg, John J. Bates, Kenneth R. Knapp, and Christian Kummerow

decided that the network Common Data Format (netCDF), which conforms to Climate and Forecast (CF), version 1.4, conventions or standards, would be utilized ( Lawrence Livermore National Laboratory 2009 ). NetCDF is a set of software libraries and machine-independent data formats that support the creation, access, and sharing of array-oriented scientific data with various publicly available tools for manipulating and displaying data ( UCAR Unidata 2009 ). SSM/IS TDR and SDR data have also been

Full access
Shelley L. Knuth, Gregory J. Tripoli, Jonathan E. Thom, and George A. Weidner

climatological aspects of this work. This project is supported by the National Science Foundation (OPP-0338147 and ANT-0636873). REFERENCES Adams , A. S. , 2005 : The relationship between topography and the Ross Ice Shelf air stream. Ph.D. dissertation, University of Wisconsin—Madison, 125 pp. [Available from Memorial Library, 728 State St., Madison, WI 53706] . Adams , N. , 2004 : Precipitation forecasting at high latitudes. Wea. Forecasting , 19 , 456 – 472 . Bintanja , R. , 1998 : The

Full access
Cristian Mitrescu, Tristan L’Ecuyer, John Haynes, Steven Miller, and Joseph Turk

28 April 2006, is to provide, from space, the first global survey of cloud vertical structure, layering, and content. Placed in a sun-synchronous polar orbit (1330 local time ascending node), CloudSat is capable of capturing the seasonal and geographical distributions necessary to evaluate, understand, and ultimately improve the way clouds and cloud feedbacks are handled within global weather and climate forecast models ( Stephens et al. 2002 ). With its nominal 2-yr mission lifetime having

Full access