ENSC 408: Lab 6 Radar Imagery Interpretation October 22 nd , 2019
Lab 4 Marks General Comments: 1. Thermal wind (2d) can be calculated by comparing the vector length with the radial axis of the hodograph • Differencing the wind speeds does not consider directional shear 2. For inactive/active front (2i) you only compare the wind component in the direction of the front (a strong easterly wind won’t move a W-E oriented front) 3. Unstable air direction determination (2k) • Draw example on board 4. Make sure to convert wind shear to comparable units (2n). Cannot compare knots/feet with s -1
Low Temp. (C) High Temp. (C) Precipitation (no/yes/type) 3 14 0 Observed 6 13 1 Forecasted 4 12 1 Class Average 5 12 0 Class 5 14 1 3 12 1 4 12 1 4 12 1 4 12 1 4 12 1 6 13 1 Weather Forecasting Results Average Score: 5 / 10
Presentation Weather Past Wx Current/Future Wx Date Discussion Sep 24 Selina Mabel Oct 1 Adele Selina Today @ 10 am Oct 8* -- -- • Presenters: Mabel & Aaron Oct 15 Aaron Andy Next Week Oct 22 Mabel Aaron • Presenters: Andy & Adele Oct 29 Andy Adele
Radar Imagery Interpretation Objective : • Learn how to interpret Doppler radar images Materials : • A sequence of Doppler radar images of a severe thunderstorm outbreak that occurred in the midwestern U.S. (near St. Louis, Missouri) in May of 2003. • Another sequence of Doppler radar images of the winter storm that affected the Prince George area on 26-27 February 2006.
Midwest CAPPI Images R = c R 10 0.0625dBZ c R = 0.036 mm h -1 dBZ = 10log(Z) How would we determine the intensity, Z, given dBZ? Storm tracking!
Prince George CAPPI Images Date/Time (UTC) Average Precipitation Rate (cm/hr) Average precip. Rates 2006-02-27 18:50 2.5 from radar 2006-02-27 19:00 2.6 Compare with airport 2006-02-27 19:10 1.2 observation data …. …. 2006-02-27 22:20 2.0 Storm tracking, persistent echoes, possible errors, resolution, rain vs snow, and more!
Assignment This lab assignment is due at the start of next week’s lab (October 29 th at 8:30 am) It is worth 5% of the final course grade There are two main parts: • the first with 5 questions to answer • the second with 10 questions (+1 bonus!)
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