Lab 5

More Stability Analysis and Soundings

Presented by: Pete StamusTues, Wed, 15-16 June 1999Hydromet 99-2

Lab 5: More Stability Analysis and SoundingsProvided:

1. 1200 UTC 13 March 1993 soundings for Hatteras NC, Dulles VA, Athens GA, Albany NY2. 0000 UTC 14 March 1993 soundings for Dulles VA, Atlantic City NJ, Albany NY3. 0000 UTC 14 March 1993 850 mb plots4. 0000 UTC 14 March 1993 MSL pressure and surface plots5. 0000 UTC 14 March 1993 500 mb heights and vorticity

Action:1. Where is the above freezing layer at Athens GA? What physical process might

have caused this?2. What is the origin of the air feeding the heavy snow in Pennsylvania and

New York?3. What is the temperature change at Albany NY between the surface and 300 mb at

1200 UTC 13 March 1993?4. Same as question 3, but for 0000 UTC 14 March 1993.5. What is the temperature change at Albany NY between 700 and 300 mb at

1200 UTC 13 March 1993?6. Same as question 5, but for 0000 UTC 14 March 1993.

Lab 5: More Stability Analysis and Soundings (cont.)

Discussion:a. Can you explain why the heaviest snow is often near the rain/snow line?

b. Why was there thundersnow at Albany NY?

13 Mar 1993 1200 UTC

Hatteras NC

13 Mar 1993 1200 UTC

Athens GA

13 Mar 1993 1200 UTC

Dulles VA

13 Mar 1993 1200 UTC

Albany NY

14 Mar 1993 0000 UTC

Dulles VA

14 Mar 1993 0000 UTC

Atlantic City NJ

14 Mar 1993 0000 UTC

Albany NY

14 Mar 1993 0000 UTC

850 mb plot

14 Mar 1993 0000 UTC