Name _________________________


Date __________________________












Meteorology 430

Fall 2010




Lab 2


Review of Basic Techniques


(Due Beginning of Class, Friday 10 September)





1.  All labs are to be kept in a three hole binder.  Turn in the binder when

     you have finished the Lab.


2.  Show all PROCEDURE.  No credit given if only

     answer is provided.


3.  Unless otherwise noted, you may work together.  But remember, YOU

     are the one who will be responsible for understanding the material for

     exams and when you are out in the profession.  So STRIVE to

     understand what you are doing.  Don't let someone else do your

     thinking for you.

1.  Determine the value of a degree in km at 40oN latitude (trigonometry).

2.  (a)          Give the PHYSICAL INTERPRETATION of each term of

 equation (cartesian coordinate) below, where V is the three   dimensional wind vector:


Temperature Tendency



 A              B                       C


     (b)         Name each term in equation.

     (c)          Solve the equation for the local tendency.

     (d)         Expand term "C".

     (e)          Assume that dT/dt = 0 for the chart given and that there is no vertical motion. Determine the local temperature tendency at the station reporting the wind of 225o, 25 knots, shown in the diagram below.  External grid points indicated by crosses are 100 km distant from station, nominally placed at center of implied x-y coordinate cross.  Isotherms are north-south.



3.  (a)  Physically interpret the terms to the right of the equals sign in

           equation (2) (basic calculus)






(b)          Equations (3a,b) are the geostrophic wind components. Put (3a,b) into (2) to determine the divegence of the geostrophic wind.  Assume    g and f are constants.  I realize we have not discussed divergence, or horizontal divergence.  But this question involves you working with the mathematical operations, not the meteorological interpretation.


4.       Obtain a plot of the NAM initialization of 500 mb heights and     absolute vorticity AND surface pressure with 1000-500 mb          thickness at initialization time for 12 UTC 31 August 2010.

         (a)      Write out the script you executed on the command line to obtain this.

         (b)     Append -p on the command line after the command to print a black and white copy to turn in with this lab.


5.       (a)      Use the script mod_grib -p to print out a copy of the 500 mb     heights for 12 UTC 31 August 2010.

         (b)     Annotate troughs and ridges as we did in Metr 201 (and Metr    400).


6.       For the sounding distributed (KOAX 12 UTC 31 August 2010), determine the

         (a)      LCL, LFC and CAPE and CIN areas for 12 UTC (first copy);

         (b)     CT, and CCL (second copy)


Make sure you draw everything neatly and use the correct color conventions.