A contour map of the temperatures in ^∘ F of the western United States made on a given day in D

step 1 For this problem, we are shown a contour map of the temperatures in degrees Fahrenheit of the we

A contour map of the temperatures in ^∘ F of the western...

A contour map of the temperatures in ${ }^{\circ} \mathrm{F}$ of the western United States made on a given day in December 2011 is shown. The level curves are called isotherms. (a) Estimate the temperature at the Four Corners, the point where Utah, Colorado, Arizona, and New Mexico meet. (b) Describe the change in temperature as you move south from the Four Corners. (c) Describe the direction you would travel if you were at the Four Corners and wanted to move as quickly as possible to the next warmer temperature zone. Comment on how your path intersects the isotherm. (d) A weather front is moving in if the isotherms are close together. Do you think a front is approaching the Four Corners? From what direction? Explain.

A contour map of the temperatures in ${ }^{\circ} \mathrm{F}$ of the western United States made on a given day in December 2011 is shown. The level curves are called isotherms.
(a) Estimate the temperature at the Four Corners, the point where Utah, Colorado, Arizona, and New Mexico meet.
(b) Describe the change in temperature as you move south from the Four Corners.
(c) Describe the direction you would travel if you were at the Four Corners and wanted to move as quickly as possible to the next warmer temperature zone. Comment on how your path intersects the isotherm.
(d) A weather front is moving in if the isotherms are close together. Do you think a front is approaching the Four Corners? From what direction? Explain.

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Key Concepts

Contour Maps

Contour maps are graphical representations that use lines to connect points of equal value on a plane, effectively displaying variations in quantities like temperature or elevation. They allow one to visualize spatial distributions and identify areas where the measured variable changes gradually or rapidly.

Isotherms

Isotherms are contour lines that specifically represent points of equal temperature. In meteorology, they help in understanding the layout of temperature fields across a region, and the spacing between these lines can indicate how quickly temperature changes from one area to another.

Gradient Direction

The concept of gradient involves the direction of steepest increase in a scalar field, such as temperature. In a contour map, the gradient is always perpendicular to the contour lines (or isotherms), and this fact is used to determine the fastest path toward warmer temperatures from a given location.

Weather Fronts

Weather fronts are boundaries separating different air masses, and they are often associated with significant weather changes. In contour maps, fronts are typically indicated by closely spaced isotherms, which signal a steep temperature gradient and the potential for active weather phenomena.

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