DEPARTMENT OF GEOSCIENCES                           NAME ________________________

San Francisco State University                                                                 Spring 2009

 

Metr 201

Synoptic Metr Quiz #5

100 pts. (Picked Up at 10:50 AM)

 

A.  Continuity (Dine’s Compensation)

 

1.      Examine the graphic below.  It shows schematic air columns with arrows indicating the sense of the wind flow.  (4 points each for 24 points)

 

 

Indicate the term or terms (there may be several) that apply to the locations shown from the choices  given in the box on the next page. The locations are at the exact elevation shown.

 

Location 1 _____________________________________________________________

 

Location 2_____________________________________________________________

 

Location 3_____________________________________________________________

 

Location 4_____________________________________________________________

 

Location 5_____________________________________________________________

 

Location 6_____________________________________________________________

 

a.  horizontal divergence

b.  horizontal convergence

c.  Level of Non-divergence

d.  Falling surface pressures

e.  Rising surface pressures

f.  subsidence

g.  vertical motion favorable for cloud development

h.  vertical motion favorable for clear skies and fair weather

 

 

B.  Dine’s Compensation on Weather Maps (24 points)

 

Examine the following charts, the first showing 250 mb divergence overlain with surface convergence, also showing the region in which the air columns had NET DIVERGENCE (upper divergence exceeds surface convergence), the second giving the 4 km infrared satellite image for 1500 UTC 8 May 2009.

 Divergence

sat

 

 

 Write a short essay (a couple of paragraphs) describing how the above images (focus at location A) are consistent with the Principle of Dine’s Compensation.

 

 


 

 

 

 

 

 

C. Multiple choice (3 points each for a total of 21 pts) (Find the choice on the right that best fits the statement or question on the left.  Answers on right can only be used  ONCE.)

 

____ vertical wind component in the natural coordinate system

 

_____added to geostrophic wind to get real wind.

 

_____ increment on the axis parallel to the horizontal wind in the natural coordinate system.

 

____  in balance with Coriolis acceleration for the case of the geostrophic wind.

 

_____ west wind component in the rectangular coordinate system

 

_____ Rossby Number

 

_____  Coriolis effect is insignificant in understanding wind flow a the low end of this scale and smaller.

 

 

a.  z axis

b.  u

c.  v

d.  w

e.  n-axis

f.  delta s

g.  pressure gradient acceleration

h.  frictional acceleration

i.  Coriolis acceleration

j.  Macroscale

k. Mesoscale

l.  Synoptic scale

m. Ratio of total acceleration to Coriolis Acceleration

n. Ageostrophic wind

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D. Map Questions

 

Questions 1 through 5  refer to Figure 1.  Figure 1 is the 500 mb chart (solid blue contours) and Surface Weather Map (isobars, solid brown) for 1400 UTC 11 May 2004.   A refers to dashed red line.  B refers to jagged blue line.  C and D refer to the locations at which those letters are plotted. (3 points each for a total of 30 points)

 

1. On figure 1,  the line labeled A is a

    a.     ridge

    b.     trough

    c.     warm front

    d.     cold front        

    e.     dry line

 

2. On figure 1,  the line labeled B is a

    a.     ridge

    b.     trough

    c.     warm front

    d.     cold front        

    e.     dry line

 

3. On figure 1,  divergence in the upper troposphere is probably occurring at

    a.     Line A

    b.     Line B

    c.     Location C

    d.     Location D

    e.     Everywhere

 

4. On figure 1,  a surface dynamic low pressure area would be found at

    a.     Line A

    b.     Line B

    c.     Location C

    d.     Location D

    e.     Everywhere

 

5.   On figure 1,  the fastest winds (the location of the jet stream) would be found at

    a.     Line A

    b.     Line B

    c.     Location C

    d.     Location D

    e.     Everywhere

 

 

 

 

 

 

Figure 1: 500 mb chart (solid blue contours) and Surface Weather Map (isobars, solid brown)

 

 

 

 

 

 

Questions 6 through 10  refer to Figure 2.   Figure 2 shows surface isobars with fronts and dryline (these are correctly placed and identified) ) for 1400 UTC 11 May 2004.

 

6. On figure 2, the contours that are color shaded indicate

    a.  a wave cyclone.

    b.  isotherms

    c.  dew point temperatures

    d.  an anticyclone.

    e.  vertical wind shear

 

7.   On figure 2. the wind direction at A would most likely be  a

    a.  North-northwest wind

    b. South-southeast wind

    c. South-southwest wind

    d.  East-northeast wind

    e.  west wind

 

8.   On figure 2. the wind direction at B would most likely be  a

    a.  North-northwest wind

    b. South-southeast wind

    c. South-southwest wind

    d.  East-northeast wind

    e.  west wind

 

9.   On figure 2. the wind direction at C would most likely be  a

    a.  North-northwest wind

    b. South-southeast wind

    c. South-southwest wind

    d.  East-northeast wind

    e.  west wind

 

10.   On figure 2. the wind direction at D would most likely be  a

    a.  North-northwest wind

    b. South-southeast wind

    c. South-southwest wind

    d.  East-northeast wind

    e.  west wind

 

 

 

 

 

Figure 2:  Surface isobars with fronts and dryline (these are correctly placed and identified)