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Lab 9

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!).

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Lab 9

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  1. Lab 9 November 13, 2013

  2. Meteograms A time display of weather information for a single observing site

  3. Temperature 21Z? __ • Dew Point 6Z? __ • Wind Direction 8Z?__ • Pressure 03Z? __ 23°F 6°F W 1032mb

  4. 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)

  5. Map of U.S.

  6. Tornadoes – Suction Vortices 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

  7. Tornadoes – Suction Vortices Source: wxbrad

  8. Tornadoes – Suction Vortices • 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

  9. Enhanced Fujita Scale Source: weather.com

  10. Determining Wind Speed of Tornadoes 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

  11. 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!

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