DEPARTMENT OF GEOSCIENCES Spring 2010
San Francisco State University NAME________________________
Metr 201 Monteverdi Quiz #3
(Test will be collected at 10:10 AM)
1. Definitions. Provide a one sentence definition (if the term is an abbreviation, first “unabbreviate” it and then define it). (5 pts each for a total of 30 pts).
(b) Equilibrium Level
(e) Lifted Index
(d) Convective Temperature
2. Units. Provide the units (metric) used conventionally for the following (3 pts each for a total of 12 pts)
buoyancy acceleration __________________________________
lifted index __________________________________
3. The sounding for Fort Worth, TX (KFWD) for 0000 UTC 4 May 1999 is shown in Fig 1. (30 pts total)
Determine the elevation (mb) of the LCL, LFC, and EL and the value of
LI for the sounding. (Show the ascent curve, and make sure to plot the
positions of the levels on the ascent curve) (28 pts)
(b) Shade in the portion of the modified sounding that has positive buoyancy (CAPE) in red. (2 pts)
4. The sealevel pressure map for 2200 3 May 1999 is given as Fig. 2. The area experiencing dew point temperatures exceeding 60oF is shaded green. The CAPE/CIN field for 2200 UTC 3 May 1999 is given in Fig. 3. Compare the pattern shown with the dew point field depicted in Fig. 2. (28 pts total)
(a) Briefly explain why the CAPE field is consistent with the dew point field (14 pts);
(b) Describe why the fact that thunderstorms were erupting over a broad area of southern Kansas, Oklahoma and north Texas would be expected given the information depicted in both Figs. 1 and 3. (Careful, it’s not just that CAPE is present) (14 pts)
Figure 1: KFWD Sounding, 0000 UTC 4 May 1999
Figure 2: Sealevel pressure map, 2200 UTC 3 May 1999. Boundaries are indicated as Lines 1, 2 and 3, and area of surface dew point exceeding 60oF is shaded in green.
Figure 3: Distribution of CAPE (red) and CIN (blue), 2200 UTC 3 May 1999.