1. eta_maps and WGSL

• Write out the procedure in outline form to accomplish the following.

1. Print a copy of the current (12 UTC 30 August 2006) chart of NAM-model initialization surface isobars and 1000-500 mb (from the WGSL).
2. Determine the area of greatest warm and cold advection (in the 1000-500 mb layer) (by performing some sort of analysis).
3. Now use a WGSL script to actually plot temperature advection in the lower mid-troposphere (say, 850 mb). Use a contour interval of 0.5 X 10^-4K s^-1). The region should center on 50N, 110W. Print this.

• In a paragraph, describe the correspondence between B and C above.

2. Pretend that you are given this task. Describe the likeliehood of severe thunderstorms in the southern Sierra Nevada (~11000 ft) (based upon post-analysis) on the afternoon of July 7, 2004. In fact, you are given this task.

You should approach this in a structured manner.

Step 1. Write a list of the SPECIFIC product(s) you would need to have/and on which to perform an analysis. (Please...be specific...do NOT say "...I need weather maps or charts...".

Step 2: Obviously, our own lab will not have this information archived. You need to think about the sources of information (hint: M301) we have used to develop archived cases.

DO NOT GO PAST THIS UNLESS YOU KNOW EXACTLY WHAT CHARTS YOU ARE GOING TO GET, AND WHY YOU ARE GOING TO GET THEM, AND THE SOURCE FOR THOSE CHARTS.

Step 3: Perform the analysis (Hint: one analysis you should NOT do is to contour a surface chart). (For your information, 9000 foot surface temperature in southern Sierra Nevada on the afternoon of July 7, 2004 was 26^oC and the dew point temperature was 1^oC. Where I got that is another question that we will discuss in class).

Step 4: Write out a cogent paragraph that answers the question posed at the top (yes, I know it is not really a question!)