DEPARTMENT OF GEOSCIENCES                                             Name ____________________

San Francisco State University                                                        Metr. 201

 

Metr 201 -- Synoptic Metr
Quiz #4 100 pts.

(Test will be collected at 10:40 AM)

 

1.     Fill in the Blank.  (4 points each for a total of 20 points in this section).

 

(a)  The 500 mb level is found typically at what height (either in decameters or feet)  ______

 

(b) The 700 mb level is found typically at what height (either in decameters or feet) ______

 

(c)  The 300 mb level is found typically at what height (either in decameters or feet) ______

 

(d) A contour of constant wind speed (or current speed) is known as an ______

 

(f)  The development of cold air downdrafts, precipitation at ground level, the anvil and lightning appear roughly simultaneously when a cumulus congestus cloud becomes cumulonimbus. This is apparently related to the formation of ______________________________ at the portion of the cloud at or near the freezing level.

 

2. Units.  Provide the metric units used conventionally for the following (4 pts each for a total of 20 pts)

        

Example

         Acceleration          meters per sec2 or m s-2

 

        

         Vg  (Geostrophic Wind Speed)   ________________________

 

         z/n                                     ________________________

 

   frictional acceleration                      ________________________

 

   500 mb height                               ________________________

 

Coriolis parameter (f=2sin)            ________________________

 

 

3.  500 mb chart (30 pts).

 

Examine the 500 mb chart given below.  Note the locations given at A, B, C and D. (5 points each answer for a total of 30 points in this section).

 

a.  The strongest winds would be found at location _____________ . Why? _____________________________


________________________________________________________________________________________________

 

________________________________________________________________________________________________

 

________________________________________________________________________________________________

 

________________________________________________________________________________________________

 

________________________________________________________________________________________________

b.  The wind direction (please use the direction designation that meteorologists use, e.g., southerly) at location A is ___________ and at location B is _______________ .

 

c.  If the wind speed at C is 55 knots, plot the correct meteorological symbol for that wind information right on the chart.

 

d. Locate one trough axis and one ridge axis, by placing the correct symbols on the chart.

 

4. Surface chart. On the surface chart below, note the Pressure System, and the three Lines that are indicated. (30 pts)

 

a. Annotate the chart with the correct symbols for the pressure system (indicate whether it is a High or a Low, by placing the correct word or letter in the correct color convention) and the boundaries at Lines 1, 2 and 3 with the correct boundary symbols and color conventions, (6 points each for a total of 24 points).

 

b. Briefly state why the pressure system is not only a cyclone, but a special type of cyclone termed "wave cyclone" (6 points).

 

 

sfc chart