SAN
FRANCISCO STATE UNIVERSITY Meteorology
430 DEPARTMENT OF GEOSCIENCES Fall 2010

Exam #2

250 Points

Name _______________________________________________

1. For
questions involving use of equations or calculations, lay out all equations carefully,
show all units, show all steps, number equations sequentially.

2. For
questions involving analysis or mapping techniques, use proper color conventions,
use proper mapping techniques (NO grease pencil on final copies).

3. This
examination is open book, open notes.

4. Answer
on separate sheets or on back of exam.

**Part A. Surface Charts **(100 points)

1.
The first chart included in the group of charts labeled ÒPart A ChartsÓ is a print of sfcwxall showing

surface observations in the eastern Pacific, and
nam_maps nam_thick for 12 UTC
12/11/06. First, draw advection
arrows and do a frontal analysis on **nam_thick**.
(30 points)

2. Using
your results in 1 above (the last question above) do a surface synoptic
analysis on the unanalyzed chart IN THE DASHED BOX. The analysis will be graded for meteorological accuracy,
proper color and analysis conventions **AND neatness**. Use the other charts provided (and any
other map or chart included in this exam) for insight. Also, although you will not be
contouring outside the dashed box, you should use the observations (that are
readable) outside the box to help you (70 points)

**Part B. Relation of Upper Air to
Surface Patterns (150 points)**

1. The simplified vorticity equation in natural
coordinates is

(1)

a. Name and describe each term in equation
(1). Then identify the term that can be dropped from equation
(1) when applying it to the synoptic scale vorticity and divergence fields in the upper troposphere? (Don't explain WHY the simplification
is made. Just state what it is and what the resulting
equation looks like). (50 points)

b. In
the group of charts labeled ÒPart B Charts,Ó you will find the 300 mb absolute
vorticity advection contour plot and the contour plot of the 300 mb absolute
vorticity field for 1200 UTC 12/11/06.
Using the equation you simplified in the previous questions, provide an
estimate of the 300 mb horizontal divergence at location A. (Show all steps!) (40 points)

c. Compare/contrast the divergence you
computed to that actually observed, as depicted on the contour plot of the
actual 300 mb divergence field provided in Part B Charts. (20 points)

d.
One of the charts included in Part B Charts shows the surface pressure tendency
for the 3 hours ending. Does the
pattern at A correspond to what you would expect from the pressure tendency
equation , assuming that the sign of 300 mb divergence field is an estimate of
the net divergence over the region?
Explain. (20 points)

e. Compare
the 500 mb vertical velocity field (given in Part B Charts) for 1200 UTC
12/11/06 with your results in (b) and (c). Do the vertical velocity values at A qualitatively
correspond to what you would expect from DineÕs Compensation, assuming that the
sign of 300 mb divergence field is an estimate of the net divergence over the
region? Explain. (20 points)

Charts For

1200 UTC
December 11, 2006

Part A
Charts

Part B
Charts