What does a line of blue triangles on a weather map indicate?
A blue line with triangles on one side is a cold front. When you see a cold front on a weather map, it means a colder air mass is trying to replace warmer air. The front marks the leading edge of the cold air. The blue triangles always point in the direction that the front (and the cold air) is going.
What are the blue lines on a weather map?
What is indicated by a blue or red line on top of a particular region on a weather map? The blue line means there is a cold front, and the red lines means there is going to be a cold front.
What do the lines on a weather map mean?
Those plain lines that curve across the map are called isobars (iso = equal, bar = pressure). They join together places with the same mean sea level air pressure (weight per square area of air above).
How do I read isobars?
Isobars are the demarcation line where the pressure will be the same along its entire length. Wind travels along the length of the isobar, and the closer the isobars are, the stronger the wind will be. Wind travels counter clockwise around low pressure systems and clockwise around high pressure systems.
How do you read a front line?
On a weather map, a warm front is usually drawn using a solid red line with half circles pointing in the direction of the cold air that will be replaced. Warm fronts usually move from southwest to northeast. A warm front can initially bring some rain, followed by clear skies and warm temperatures.
What do isobars tell us?
What is an isobar? 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.
What is the highest air pressure on the map?
4. The highest air pressure reading on the map is 10160 millibars. 5.
What can we infer when isobars are tightly spaced?
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. Conversely, when isobars are very loosely grouped together the winds are typically calm.
How do isobars help 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.
Why do isotherms generally trend east west?
Why do isotherms on the January and July temperature maps generally trend east–west? An isotherm represents a line that connects points of equal temperature. The east–west trend of isotherms reflects the strong influence of latitude on the temperature and thus how the radiant energy budgets are affected.
What happens when isobars are far apart?
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. When isobars are spaced far apart then the pressure changes more gradually over distance and thus the wind speed is weaker.
How do fronts help predict weather?
Since air masses interact in a relatively predictable way, meteorologists are able to predict weather patterns with some degree of accuracy. As explained above, Fronts are responsible for most changes in weather. Cold Fronts occur when a cold air mass, which has a high density, pushes under a warm air mass.
What kind of weather does high pressure bring?
A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere. These bring sunny skies.
How does air pressure affect us?
Barometric pressure is the weight of the atmosphere that surrounds us. Barometric pressure often drops before bad weather. Lower air pressure pushes less against the body, allowing tissues to expand. Expanded tissues can put pressure on joints and cause pain.
Does high barometric pressure cause body aches?
Changes in barometric pressure may make your tendons, muscles, and any scar tissue expand and contract, and that can create pain in joints affected by arthritis. Cold temperatures cause changes in our blood flow, our body naturally wants to keep us warm.
Does high air pressure make you tired?
Yet another reason for feeling tired or “down” in rainy weather is the effect of barometric pressure. Lower barometric pressure, which tends to accompany stormy weather, reduces the amount of available oxygen in the air. Drowsiness is one of the first signs of insufficient oxygen.”
Why do I feel sleepy when it rains?
When it rains, there is more water vapor in the air, it results in lower air pressure and a relative decrease in oxygen content. In such a situation, brain begin to slack off, and people will feel sleepy.
Does high or low barometric pressure cause headaches?
Researchers saw a connection between an increase in medication sales and changes to barometric pressure. From this, the researchers concluded that a decrease in barometric pressure causes an increase in the incidence of headaches. The barometric pressure doesn’t have to change drastically to cause headaches, either.
Is 30 barometric pressure high?
A barometer reading of 30 inches (Hg) is considered normal. Strong high pressure could register as high as 30.70 inches, whereas low pressure associated with a hurricane can dip below 27.30 inches (Hurricane Andrew had a measured surface pressure of 27.23 just before its landfall in Miami Dade County).