Isobars are lines on a weather map
that join places of equal pressure
. Meteorologists collect information from weather stations, buoys and ships and then draw smooth curves to join the dots. Atmospheric pressure is measured by barometers in hectopascals (hPa), and there is a 4 hPa difference between isobars.
What do isobar lines represent?
Isobars:
lines of constant pressure
. A line drawn on a weather map connecting points of equal pressure is called an isobar. The isobars are generated from mean sea level pressure reports and the pressure values are given in millibars.
What does an isobar represent on a weather map?
What do isobars represent on weather maps? Dear Mal, A bar is a metric unit of pressure and isobars are lines on a weather map
that connect points of equal air pressure
. Because variations in air pressure drive atmospheric winds, isobars give meteorologists an easy way to assess wind direction and speed.
When lines on an isobar map are very close together this may be an indication of what kinds of weather?
Isobars are lines/areas of equal pressure represented on a weather map. When isobars become very tightly grouped together it indicates
a “tight pressure gradient” (steep slope)
. The tightly packed isobars are due to the difference in air pressure between between High and Low pressure systems.
What are isobars in weather for kids?
When you watch the weather forecast, watch out for the lines on the weather map. These lines actually
show us the air pressure
and are called ‘isobars’. When the isobars are all packed tightly together this shows an area of low pressure, when they are spread apart it shows high pressure.
What do closely spaced isobars indicate about wind?
Closely spaced isobars indicate
a strong wind
; widely spaced isobars indicate a light wind.
What do closely spaced isobars indicate quizlet?
Closely spaced isobars indicate
a steep pressure gra- dient and high winds
. Widely spaced isobars indicate a weak pressure gradient and light winds.
How do isobars affect weather?
Isobars are lines of constant or equal pressure on a weather map. They can be used to find areas of low or high pressure over a broad area (like the U.S.), and they can
tell us how intense the system may be
.
How do isobars predict weather?
Meteorologists use isobars on weather maps to
depict atmospheric pressure changes over an area
and to make predictions concerning wind flow. … The greater the contrast in pressure difference between two areas, the faster the wind will blow, so closer isobars on a weather map predict higher velocity winds.
What happens when isobars are close together on a weather map?
The lines around high and low pressure on a weather map are called isobars, or lines of equal pressure, as shown in the above image on the left. When isobars are close together it is
very windy
; when they are further apart, conditions are more calm.
When looking at a weather map closely spaced isobars indicate a steep pressure gradient and?
The closer the isobars, the steeper the pressure gradient. Closely spaced isobars indicate a
steep pressure gradient and high winds
whereas widely spaced isobars indicate a gentle pressure gradient and weak winds. 16.)
What conditions are associated with isobars that are widely spaced?
The stronger the pressure gradient force, the stronger is the wind. Thus, closely spaced isobars mean strong winds; widely spaced isobars mean
lighter wind
.
How do maps showing isobars help meteorologists What usually results when isobars are close together?
Spaced. Isobars that are close together
indicate a large pressure
. A large pressure causes strong winds. Isobars that are spread apart indicate a smaller pressure.
How do isobars indicate wind speed?
The relationship between isobar spacing and wind speed is that
the closer the isobar spacing then the stronger the wind speed
. The spacing between isobars represents a pressure differential between those two isobars. When two isobars are closer together then the pressure changes at a greater rate over distance.
What are 4 rules when drawing isobars?
- Isobar lines may never cross or touch.
- Isobar lines may only pass through pressures of 1000 + or – 4. …
- The atmospheric pressure is given in millibars (mb). …
- Pressure lines are usually corrected for sea level so any differences in pressure due to altitude are ignored.
Why pressure gradient is strong when isobars are close?
The pressure gradient is strong where the isobars are close to each other and is
weak where the isobars are apart
. Since a closely spaced gradient implies a steep pressure change, it also indicates a strong wind speed. The wind direction follows the direction of change of pressure, i.e. perpendicular to the isobars.
How does the spacing of isobars on a weather map generally relate to the speed of wind quizlet?
How does the spacing of isobars on a weather map generally relate to the speed of wind? Closely spaced
isobars indicate a strong pressure gradient and high wind speeds
; widely spaced isobars indicate a weak pressure gradient and low wind speeds. … The meteorologist comments that the pressure tendency is rising.
