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Alain Roberge, John R. Gyakum, and Eyad H. Atallah

1. Introduction Intense precipitation during the cold season on the North American west coast is believed to often be caused by poleward-traveling extratropical cyclones ( Lackmann and Gyakum 1999 ). The amount of water vapor and heat transported is so important that it may cause significant flooding in the mountains ( Colle and Mass 2000 ; Neiman et al. 2002 ; Ralph et al. 2006 ). This is caused by the combination of intense orographic precipitation and fast snowmelt, which may also initiate

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Christian Herold, Dietrich Althausen, Detlef Müller, Matthias Tesche, Patric Seifert, Ronny Engelmann, Cyrille Flamant, Rohini Bhawar, and Paolo Di Girolamo

. , and Coauthors , 2007 : Intercomparison of water vapor data measured with lidar during IHOP_2002. Part II: Airborne-to-airborne systems . J. Atmos. Oceanic Technol. , 24 , 22 – 39 . Bhawar, R. , and Coauthors , 2011 : The water vapour intercomparison effort in the framework of the Convective and Orographically-Induced Precipitation Study: Airborne-to-ground-based and airborne-to-airborne lidar systems . Quart. J. Roy. Meteor. Soc. , 137 , 325 – 348 , doi:10.1002/qj.697 . Bronstein, I

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Timothy L. Olander and Christopher S. Velden

large temporal gaps, thereby missing convective structure changes that may be relevant to TC intensity changes. A concept to address this issue using geostationary satellite data was presented by Velden and Olander (1998) , but until recently this potential method has not been explored further. In this study, a technique is developed that builds on the Velden and Olander (1998) concept and highlights the spectral response differences between geostationary infrared window (IRW) and water vapor (WV

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O. Bock and M. Nuret

during the AMMA EOP. However, the assessment of NWP models makes sense only when independent observations are used. Hence, in the present work we use precipitable water vapor (PWV) estimates provided by a network of ground-based global positioning system (GPS) receivers, the data of which are not presently assimilated into the currently used NWP models. The GPS technique is known to provide very accurate estimates of PWV (usually considered at the level 1–2 kg m −2 ) with high temporal resolution

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Gary A. Wick, Paul J. Neiman, F. Martin Ralph, and Thomas M. Hamill

2012 ). Recent research has demonstrated that major winter flooding events both in California and the Pacific Northwest were accompanied by the presence of features termed atmospheric rivers ( Ralph et al. 2006 ; Neiman et al. 2008a ; Neiman et al. 2011 ). Atmospheric rivers (ARs) are long, narrow regions of intense water vapor transport within the lower atmosphere (e.g., Zhu and Newell 1998 ; Ralph et al. 2004 ) that represent a subset corridor within a broader region of generally poleward

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Lisa S. Darby, Allen B. White, Daniel J. Gottas, and Timothy Coleman

1. Introduction Since 2007, the Physical Sciences Division (PSD) of the National Oceanic and Atmospheric Administration’s (NOAA) Earth System Research Laboratory (ESRL) has provided an online water vapor flux tool (WVFT), with observations and forecasts available in near–real time ( ). The WVFT displays of measurements and 3-h forecasts are useful for predicting precipitation at several locations in the western United States, indicating when

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Lynn A. McMurdie and Kristina B. Katsaros

230 VOLUME 11 WEATHER AND FORECASTING Satellite-Derived Integrated Water Vapor and Rain Intensity Patterns: Indicators for Rapid Cyclogenesis LYNN A. MCMURDIE AND KRISTINA B. KATSAROS Department of Atmospheric Sciences, University of Washington, Seattle, Washington (Manuscript received 21 April 1995, in final form 22 January 1996) ABSTRACT Rapidly deepening cyclones in midlatitudes are characterized by large cloud shields and abundant conden- sation qualitatively evident in

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Anthony Wimmers, Sarah Griffin, Jordan Gerth, Scott Bachmeier, and Scott Lindstrom

, turbulent conditions may arise from complex interactions of a gravity wave with its environment, as the variability of shear and stability within the wave can generate local regions of subcritical turbulent flow. Within this picture of turbulence and its causes, we have begun to find types of gravity waves with consistent characteristics in the AHI/ABI water vapor channels that correspond to aircraft reports of turbulence. (However, only AHI observations will be presented here because at the time of

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Kristina B. Kanaros, Iffekhar Bhatti, Llynn A. Mcmurdie, and Grant W. Petty

VOL. 4, NO. 4 WEATHER AND FORECASTING DECEMBER 1989Identification of Atmospheric Fronts over the Ocean with Microwave Measurements of Water Vapor and RainKRISTINA B. KATSAROS, IFTEKHAR BHATTI, LYNN A. MCMURDIE AND GRANT W. PETTYDepartment of Atmospheric Sciences, University of Washington, Seattle, Washington(Manuscript received 6 May t988, in final form 1 May 1989) ABSTRACT

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Stefano Mariani, Christophe Accadia, Nazario Tartaglione, Marco Casaioli, Marco Gabella, Silas Chr Michaelides, and Antonio Speranza

particular the use of TRMM PR observations for the improvement of the precipitation analysis fields and its use in NWP verification study. Moreover, as discussed later, alternative observations from space, like total column water vapor (TCWV), can be used to perform a model evaluation over otherwise in situ data-void regions. The island of Cyprus, located in the eastern Mediterranean Sea (see Fig. 1 ), was an optimal test site for the project’s activities. Cyprus is one of the few European lands covered

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