1. OBJ: Given notes and activity sheets SWBAT construct and interpret isoline maps such as a weather map with 70% accuracy. DN: Copy notes ACT: Introduction to Isolines; Rules of Isolines; Interpreting Different Isolines; Isoline and Gradient video iPad assignment HW: Complete IAP Activity Sheet; Work on Meteorology Activity Sheet; Weather Exam, Oct 29; Interim Exam Nov 6 (10%)

2. What is an isoline? Isoline : line that connects points of equal value on a map. Examples: 1 ) isotherm (°C): line that connects points of equal temperature. 2) isobar (mb, in.): line that connects points of equal air pressure. 3) Contour line (m, ft): line that connects points of equal elevation. Interval : difference between two neighboring lines.

3. ISOLINE PRACTICE

5. Watch: Constructing An Isoline Video

6. Rules of Isolines Isolines never touch or cross Isolines are parallel and are curved Isolines form closed loops (bullseyes) except at the edge of the map; At center of bullseyes, H = High pressure and L = Low pressure. Each point on an isoline is the same On an isoline map, the interval remains the same

7. H = high pressure L= low pressure Isobar map = part of a Weather Map INTERVAL: _______mb

8. Interpreting Different Isolines When pressure lines are close together, strong winds; when pressure lines are far apart, gentle winds. When contour lines are close together, land is steep; when contour lines are far apart, land is flat, gentle. At an ocean shoreline, sea level is at 0 meters (0 feet).

9. Isobar Map (mb) STRONG WINDS GENTLE WINDS

10. STEEP “cliff” GENTLE “valley” ______feet

11. Finding Elevation, Distance, Gradient How do we measure elevation? How do we measure distance? How do we find slope or gradient (slope) of the land? Gradient = change in elevation change in distance 859ft - 680 ft 2 mi 179 ft = 89.5 ft 2 mi mile

12. Watch: How to Calculate Gradient of a Slope