What is the purpose of isolines on a weather map? Isolines on a weather map connect points of equal value of temperature, air pressure, wind speed, etc., and they help determine and predict upcoming weather. Define isobar, isotach, and isotherm. How are high and low pressure cells indicated on a weather map?

## Why do we use isobars and isotherms?

Isobars and isotherms are lines on weather maps which represent patterns of pressure and temperature, respectively. They show how temperature and pressure are changing over space and so help describe the large-scale weather patterns across a region in the map.

## When lines on an isobar map are very close together this may be an indication of what kinds of weather?

Closely spaced isobars indicate large pressure changes over a small area and suggest strengthening winds. Widely spaced isobars portray a “flat” or weak pressure gradient typical of light-wind situations. Tom Skilling is chief meteorologist at WGN-TV.

## What is the name given to an Isoline that connects points of equal temperature?

Isotherm. A line representing points of equal temperature.

## Do Isolines ever end?

Isolines never end, except at the edge of a map. The change in value from one isoline to the next is always the same.

## What are the 3 types of Isolines?

Isoline Maps

• Contour line: Joins points of the same height above ground.
• Isobath: Joins points of the same depth below water.
• Isobar: Joins points with the same atmospheric pressure.
• Isotherm: Joins points with the same temperature.
• Isobathytherm: Joins points with the same temperature under water.

## What do Isolines show?

Isoline maps help the reader to recognise patterns and relationships between the geography of an area and data that might have been collected on the ground, such as air temperature. Isolines are lines drawn on a map connecting data points of the same value. They are commonly used by geographers.

## What called Isolines?

Isoline may refer to: Contour line (line of constant elevation or depth, sometimes used to describe other lines of constant value) A line of constant value on a map or chart. Examples include isobar (equal barometric pressure), isotherm (equal temperature), and isohyet (equal precipitation).

## What does it mean when Isolines are close together?

The distance between isolines shows the amount of the gradient. Very close together means a steep gradient, and far apart means a gradual gradient. This can be quite meaningful. In hurricanes, the isobars are very close together and so the air pressure gradient is said to be high, or steep.

## What are the rules of Isolines?

Isolines are gentle, curving lines- No sharp corners! No double or messy lines! Isolines are always closed curves even though the map might only show part of it. Your line must be a closed loop or reach the edge of the map!

## Do Isolines usually have sharp angles or gentle curves?

Isolines are gentle, curving lines- no sharp corners.

## Are Isolines drawn at regular intervals?

2) isolines are drawn at regular intervals. 5) where isolines are close together, they show an abrupt horizontal change in the phenomenon; when they are far apart, they show a gradual horizontal change. 6) values inside a closed isoline are either higher or lower than those outside the closed isoline.

## What do isobars join?

Isobars join places with equal air pressure, and isotherms join places with equal temperature. Lines on a map joining places that have the same air pressure. Isotherm. Lines on a map joining places that have the same temperature.

## How do you contour weather maps?

Contouring Weather Maps By drawing contours, I mean drawing isolines: lines of equal measurement. For example, say we want to contour temperature every 5 degrees, starting with 60 °F. We will then look the temperature recorded at each station, and draw a line through where we expect to find a temperature of 60 °F.