Process-Oriented Analysis of Environmental Conditions Associated with Precipitation Fog Events in the New York City Region

An analysis of the environmental conditions associated with precipitation fog events is presented using 20 yr of historical observations taken in a region centered on New York, New York. The objective is to determine the preferred weather scenarios and identify physical processes influencing the formation of fog during precipitation. Salient synoptic-scale features are identified using NCEP–NCAR reanalyses. Local environmental parameters, such as wind speed and direction, temperature, and humidity, are analyzed using surface observations, while the vertical structure of the lower atmosphere is examined using available rawinsonde data. The analysis reveals that precipitation fog mostly occurs as a result of the gradual lowering of cloud bases as continuous light rain or light drizzle is observed. Such scenarios occur under various synoptic weather patterns in areas characterized by large-scale uplift, differential temperature advection, and positive moisture advection. Precipitation fog onset typically occurs with winds from the northeast at inland locations and onshore flow at coastal locations, with flows from the south to southwest aloft. A majority of the cases showed the presence of a sharp low-level temperature inversion resulting from differential temperature advection or through the interaction of warm air flowing over a cold surface in onshore flow conditions. This suggests a common scenario of fog formation under moistening conditions resulting from precipitation evaporating into colder air near the surface. A smaller number of events formed with cooling of the near-saturated or saturated air. Evidence is also presented of the possible role of shear-induced turbulent mixing in the production of supersaturation and fog formation during precipitation.

[1]  D. Vickers,et al.  Flow Adjustments Across Sea-Surface Temperature Changes , 2004 .

[2]  W. Collins,et al.  The NCEP–NCAR 50-Year Reanalysis: Monthly Means CD-ROM and Documentation , 2001 .

[3]  W. T. Roach,et al.  The haar of north-east Scotland , 1989 .

[4]  R. Rasmussen,et al.  The Estimation of Snowfall Rate Using Visibility , 1999 .

[5]  Thomas M. Smith,et al.  Improved Extended Reconstruction of SST (1854–1997) , 2004 .

[6]  D. Leipper.  Fog on the U.S. West Coast: A Review , 1994 .

[7]  A. H. Palmer.  FOG ALONG THE CALIFORNIA COAST , 1917 .

[8]  Matthew T. Friedlein,et al.  DENSE FOG CLIMATOLOGY , 2004 .

[9]  S. Jeffrey Underwood,et al.  A Multiple-Case Analysis of Nocturnal Radiation-Fog Development in the Central Valley of California Utilizing the GOES Nighttime Fog Product , 2004 .

[10]  J. A. Garland,et al.  A field study of radiation fog , 1973 .

[11]  V. R. Noonkester.  Coastal Marine Fog in Southern California , 1979 .

[12]  A. H. Woodcock.  Winds, Upwelling and Fog at Cape Cod Canal, Massachusetts , 1984 .

[13]  A. H. Woodcock,et al.  Marine Fog Droplets and Salt Nuclei -Part 11 , 1978 .

[14]  J. M. Lewis,et al.  Sea fog off the California coast: Viewed in the context of transient weather systems , 2003 .

[15]  Bertil Rodhe.  The effect of turbulence on fog formation , 1962 .

[16]  R. N. Swanson,et al.  High-Inversion Fog Episodes in Central California , 1981 .

[17]  G. Garland Lala,et al.  Climatological Aspects of Radiation Fog Occurrence at Albany, New York , 1990 .

[18]  J. Turton,et al.  A comparison of a numerical model of radiation fog with detailed observations , 1987 .

[19]  S. Colucci,et al.  An East Coast Winter Storm Climatology , 2001 .

[20]  Edward P. Lozowski,et al.  Weather conditions associated with the passage of precipitation type transition regions over eastern Newfoundland , 1995 .

[21]  Shan Ling Pan,et al.  Automatic knowledge extraction from survey data: learning M-of-N constructs using a hybrid approach , 2005, J. Oper. Res. Soc..

[22]  Darko Koracin,et al.  Transition of Stratus into Fog along the California Coast: Observations and Modeling , 2001 .

[23]  N. Westcott.  Some aspects of dense fog in the Midwestern United States , 2007 .

[24]  N. R. Donaldson,et al.  Fog induced by mixed-phase precipitation , 1993 .

[25]  J. Collett,et al.  The influence of drop size-dependent fog chemistry on aerosol processing by San Joaquin Valley fogs , 1999 .

[26]  A. Korolev,et al.  Drop Growth Due to High Supersaturation Caused by Isobaric Mixing , 2000 .

[27]  The Vertical Profile of Wind and Temperature in Cyclones and Anticyclones over the Eastern Two-Thirds of the United States: A Climatology , 2002 .

[28]  R. Stewart,et al.  Distributions of precipitation and associated parameters across precipitation type transitions over southern Ontario , 1993 .

[29]  J. Mason.  The Physics of Radiation Fog , 1982 .

[30]  R. Stewart,et al.  Precipitation types in the transition region of winter storms , 1992 .

[31]  F. Fujibe.  On the Near-0 °C Frequency Maximum in Surface Air Temperature under Precipitation: A Statistical Evidence for the Melting Effect , 2001 .

[32]  H. R. Pruppacher,et al.  A Wind Tunnel and Theoretical Study of the Melting Behavior of Atmospheric Ice Particles. IV: Experiment and Theory for Snow Flakes , 1990 .

[33]  S. Caughey,et al.  The physics of radiation fog: I – a field study , 1976 .

[34]  R. Pielke,et al.  Diurnal Boundary-Layer Development over Sloping Terrain , 1981 .

[35]  J. Seinfeld,et al.  Atmospheric Chemistry and Physics: From Air Pollution to Climate Change , 1997 .

[36]  Addison L. Sears-Collins,et al.  Spatial and Temporal Variability of Nonfreezing Drizzle in the United States and Canada , 2006 .

[37]  Roy Rasmussen,et al.  Event-Based Climatology and Typology of Fog in the New York City Region , 2007 .

[38]  J. .. George.  Fog: Its Causes and Forecasting with Special Reference to Eastern and Southern United States (III)* , 1940 .

[39]  Yang-Ki Cho,et al.  Sea Fog around the Korean Peninsula , 2000 .

[40]  Fog Forecasting for the Southern Region: A Conceptual Model Approach , 1997 .

[41]  J. Collett,et al.  Spatial and temporal variations in San Joaquin Valley fog chemistry , 1998 .

[42]  Heini Wernli,et al.  A 15-Year Climatology of Warm Conveyor Belts , 2004 .

[43]  S. Petterssen.  On the Causes and the Forecasting of the California Fog , 1938 .

[44]  G. Taylor.  The formation of fog and mist , 2007 .

[45]  C. W. Rogers,et al.  The Formation of Marine Fog and the Development of Fog-Stratus Systems along the California Coast , 1979 .

[46]  C. W. Rogers,et al.  The Life Cycle of Valley Fog. Part I: Micrometeorological Characteristics , 1975 .

[47]  Louis A. Goldman,et al.  ON FORECASTING CEILING LOWERING DURING CONTINUOUS RAIN , 1951 .

[48]  M. H. Smith,et al.  A field study of radiation fog in meppen, West Germany , 1981 .

[49]  H. Gerber.  Supersaturation and Droplet Spectral Evolution in Fog , 1991 .

[50]  The Microstructure of California Coastal Fog and Stratus , 1977 .

[51]  D. Fitzjarrald,et al.  Hudson Valley Fog Environments , 1989 .

[52]  John M. Lewis,et al.  Sea Fog Research in the United Kingdom and United States: A Historical Essay Including Outlook , 2004 .

[53]  Russell S. Vose,et al.  Overview of the Integrated Global Radiosonde Archive , 2006 .

[54]  C. W. Rogers,et al.  The Life Cycle of Valley Fog. Part II: Fog Microphysics , 1975 .

[55]  Thierry Bergot,et al.  Numerical Forecasting of Radiation Fog. Part I: Numerical Model and Sensitivity Tests , 1994 .

[56]  N. Westcott.  Synoptic conditions associated with dense fog in the midwest , 2004 .

[57]  M. Sinclair.  Objective Identification of Cyclones and Their Circulation Intensity, and Climatology , 1997 .

[58]  Barry D. Keim,et al.  Manual synoptic climate classification for the east coast of New England (USA) with an application to PM2.5 concentration , 2005 .

[59]  R. Reynolds,et al.  The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[60]  Sverre Petterssen,et al.  Introduction to Meteorology , 1941 .