Moist Dynamics and Orographic Precipitation in Northern and Central California during the New Year’s Flood of 1997

Galewsky, Joseph; Sobel, Adam
June 2005
Monthly Weather Review;Jun2005, Vol. 133 Issue 6, p1594
Academic Journal
The dynamics of moist orographic flows during the January 1997 floods in northern and central California are investigated using numerical simulations computed with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5). Early in the event (31 December 1996–1 January 1997), the low-level winds offshore of California’s central coast were blocked by the topography of the Santa Lucia Range, and the low-level winds in the Central Valley were blocked by the topography of the central Sierra Nevada Range. In contrast, moisture-laden winds along the northern Coast Ranges and the northern Sierra Nevada flowed over topographic barriers. As the core of humid air migrated to the south over 24 h, the low-level barrier jets weakened as the atmospheric stability decreased, bringing heavy rainfall to the central and southern Sierra Nevada at the end of the event. The heavy precipitation during this event was largely controlled by the interaction of the flow with topography, with little contribution from non–topographically forced dynamical uplift. Latent heating was essential for lowering the effective stability of the flow and allowing the winds to flow over mountainous terrain, particularly in the northern Coast Ranges, and for enhancing the low-level jet and associated moisture transport. The horizontal distribution of static stability played a key role in the event by setting up a complex combination of flow-over and flow-around regimes that enhanced uplift in the northern Sierra Nevada during the period of heaviest rainfall.


Related Articles

  • Effect of Moisture Content on Selected Physical and Mechanical Properties of Two Varieties of Tigernut (Cyperus spp). Oyerinde, A. S.; Olalusi, A. P. // Journal of Food Research;Dec2013, Vol. 2 Issue 6, p24 

    The effect of moisture content on some physical and mechanical properties of two varieties of tigernuts (Cyperus esculentus) was investigated. These properties include: geometric dimensions, linear dimensions, 1000 tuber weight, bulk density, tuber size, sphericity, angle of repose, porosity,...

  • The onset and life span of the Madden—Julian oscillation. Seo, K.-H.; Kumar, A. // Theoretical & Applied Climatology;2008, Vol. 94 Issue 1/2, p13 

    While the canonical life cycle of the Madden–Julian oscillation (MJO) is relatively well studied, little attention has been given to the determination of its periodicity and the detailed low-level dynamic structure during the onset phase. Here we present observational evidence of...

  • Formulation Development and Evaluation of Transdermal Patches of Losartan. Jain, D. K.; Darwhekar, G. N.; Chaurasia, S. // International Journal of PharmTech Research;Apr-Jun2012, Vol. 4 Issue 2, p757 

    The purpose of this research was to develop matrix type transdermal therapeutic system containing losartan with different ratios of hydrophilic and hydrophobic polymeric concentration by the solvent evaporation technique. The prepared patched showed satisfactory physiochemical characteristics of...

  • Rainfall distribution over central and southern Israel induced by large-scale moisture flux. Isakson, A. // Journal of Applied Meteorology;Jul96, Vol. 35 Issue 7, p1063 

    Studies rainfall distribution over Israel. Calculation of net condensation in large-scale moisture transport through the eastern Mediterranean; Sea surface evaporation; Orographic condensation above the Judean mountain range.

  • A scaling analysis of soil moisture�precipitation interactions in a regional climate model. Jones, A. R.; Brunsell, N. A. // Theoretical & Applied Climatology;2009, Vol. 98 Issue 3/4, p221 

    The University of Oklahoma�s Advanced Regional Prediction System (ARPS) was used to examine the impacts of varying mean soil moisture and model resolution on the magnitude and frequency of precipitation events in the U.S. Central Plains and to determine whether modeled soil moisture and...

  • Quantifying the Spatial Variability of Surface Fluxes Using Data from the 2002 International H2O Project. Alfieri, Joseph G.; Niyogi, Dev; Hao Zhang; LeMone, Margaret A.; Fei Chen // Boundary-Layer Meteorology;Dec2009, Vol. 133 Issue 3, p323 

    Spatial variability in the exchange of energy and moisture is a key control on numerous atmospheric, hydrologic, and environmental processes. Using observations made on fair weather days during the 2002 International H2O Project, four methods for quantifying the spatial variability of surface...

  • Egyptian cotton ( Gossypium barbadense) flower and boll production as affected by climatic factors and soil moisture status. Sawan, Zakaria M.; Hanna, Louis I.; McCuistion, Willis L.; Foote, Richard J. // Theoretical & Applied Climatology;2010, Vol. 99 Issue 1/2, p217 

    The information on impact of climatic factors on cotton production is not generally available, or at least not available in the required form. Understanding this impact may help physiologists determine a possible control of the flowering mechanism in the cotton plant. Two field trials were...

  • A Downscaling Method for Improving the Spatial Resolution of AMSR-E Derived Soil Moisture Product Based on MSG-SEVIRI Data. Wei Zhao; Ainong Li // Remote Sensing;Dec2013, Vol. 5 Issue 12, p6790 

    Soil moisture is a vital parameter in various land surface processes, and microwave remote sensing is widely used to estimate regional soil moisture. However, the application of the retrieved soil moisture data is restricted by its coarse spatial resolution. To overcome this weakness, many...

  • The Influence of Electrical Resistivity Array on its Soil Electrical Resistivity Value. Zainal Abidin, Mohd Hazreek; Saad, Rosli; Wijeyesekera, Devapriya Chitral; Ahmad, Fauziah; Ismail, Nur Azwin // Applied Mechanics & Materials;2014, Issue 510, p185 

    Electrical resistivity technique has become a popular alternative tool by the geotechnical engineers in subsurface investigation. This study presents the influence of soil electrical resistivity value (ERV) due to the different types of electrical resistivity array used in practice. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics