Dr. John W. (Jack) Glendening   Meteorologist  
         
          25953 Deer Run Lane, Salinas, CA 93908


Those looking for the "on-line Big Sur Ventana/SilverPeak Trail Map" will find it at http://bigsurtrailmap.net/


"Dr Jack" is the creator of the following forecasts for soaring pilots:

USA only:
BLIP (Boundary Layer Information Prediction) SOARING FORECASTS
        RAP & NAM BLIPMAPs  
        BLIPSPOTs  

Global:
RASP (Regional Atmospheric Soaring Prediction) SOARING FORECASTS
        RASP BLIPMAPs  

California-Nevada (primarily):
        WINDIP upper-level wind and mt. wave forecasts


Forums: 
        BLIPMAP Forum (Thermal Soaring Forecasts & Meteorology)
        RASP Forum: for RASP prediction operators/users

Presentation Slides: 
        2003 Soaring Society of America Convention: BLIPMAPs
        Soaring Meteorology for Power Pilots
        BLIPMAP Future - USHPA ExComm dinner 2006

I Fly a ...

I Used to Fly a ...

Sometimes I help condors fly ...


Education:

B.S., Physics, Massachusetts Institute of Technology, 1967
M.S., Atmospheric Sciences, Colorado State University, 1977
Ph.D., Atmospheric Sciences, University of Washington, 1985

Research Interests:

Atmospheric Boundary-Layer processes
Large-Eddy Simulation (LES) modelling
Mesoscale Boundary-Layer variations

"A useful working definition identifies the atmospheric boundary layer as the layer of air directly above the Earth's surface in which the effects of the surface (friction, heating and cooling) are felt directly." [The Atmospheric Boundary Layer, J.R.Garrett]   I would define the atmospheric boundary layer to be the region influenced by turbulence generated either mechanically or thermally at the Earth's surface.

A Large-Eddy Simulation (LES) is a model which uses the differential equations of motion to simulate turbulent eddies with grid point spacings small enough to explicitly resolve internal eddy dynamics.  While a global atmospheric model uses grid spacings of 50-500 km and a limited-area (mesoscale) weather model uses grid spacings of 5-50 km, a LES uses grid spacings of 5-50 meters.

Mesoscale features have horizontal diameters of around 50-500 km and are thus smaller in size than global-scale (synoptic) weather systems but larger than boundary-layer eddies.

Representative research:

Large-Eddy Simulation example of three-dimensional thermal plumes
Thermals are created and grow downwind over the relatively warm water surface - but they grow much more rapidly at the downwind edge of the water surface, where mean motion creates an enviroment more favorable to vertical growth.
(here color indicates height, with red/purple indicating high/low altitude)

Large-Eddy Simulation example of boundary-layer roll vortices
What glider pilots call cloud streets, minus the clouds, as viewed from above
(here color indicates vertical velocity, with red/blue indicating upward/downward motion)

Large-Eddy Simulation example of a three-dimensional density current
A sea-breeze front being one example, two are shown moving towards each other as viewed from the side.  The vertical extrusion of the one on the right is created by upward motion.
(here color indicates temperature, with red/blue indicating warm/cold)

Representative publications:

Glendening, J.W., 2000: Budgets of lineal and nonlineal turbulent kinetic energy under strong shear conditions. J. Atmos. Sci., 57, 2297-2318.

Glendening, J.W., 1996: Lineal eddy features under strong shear conditions. J. Atmos. Sci., 53, 3430-3449.



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