Lab 9

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# Lab 9 - PowerPoint PPT Presentation

Lab 9. November 13, 2013. Meteograms. A time display of weather information for a single observing site. Temperature 21Z? __ Dew Point 6Z? __ Wind Direction 8Z?__ Pressure 03Z? __. 23°F. 6°F. W. 1032mb. Laboratory Exercise 14.10 a &amp; b (20 POINTS!).

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### Lab 9

November 13, 2013

Meteograms

A time display of weather information for a single observing site

Temperature 21Z? __

• Dew Point 6Z? __
• Wind Direction 8Z?__
• Pressure 03Z? __

23°F

6°F

W

1032mb

Laboratory Exercise 14.10 a & b (20 POINTS!)
• Researching the frequency of large hail (>2” diameter) in each U.S. State
• http://www.ems.psu.edu/~nese/hail.htm
• Use Figure 15.40b for Part b.
• Part a.
• Maine: ___ occurrences
• Part b.
• Area of Maine: _____ 10,000 mi2
• Normalized Hail Occurrences = = 2.3 occurrences per 10,000 mi2

8

3.5 (Using Figure 15.40b)

Some of the most violent tornadoes contain smaller whirls that orbit around the center of the parent tornado, guided by the parent’s counterclockwise spin - Multi-Vortex Tornadoes.

Suction Vortices – smaller, whirling offspring within a larger tornado

Cycloid – looping damage path caused by a suction vortex

• Calculating maximum wind speed of multi-vortex tornado
• Rotational winds = 90 mph
• Moving North at 10 mph
• Suction Vortex wind speed = 35 mph
• Maximum wind speed = (90 + 10 + 35) mph = 135 mph
Enhanced Fujita Scale

Source: weather.com

Photogrammetry – frame-by-frame analyses of flying debris in a tornado yield the distances objects move over a specific period of time

Wind speeds can be calculated from these distances and time

Velocity = 23 mph

Lab 9 Assignment

13.10 a, b, c

14.3 a, b

14.10 a, b (use fig. 15.40b for part b) (20 points!)

15.1 a, d (see p. 662)

15.5 a, b, c

15.6

Dillon’s OFFICE HOURS Thursday; 6ish-7:30; 6th floor Walker; e-mail too!

Ask Paul or Matt if unsure of theirs!