Wcvb Radar Radar Map (2024)

FAQs

Is there a tornado watch in Boston? ›

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The WSR-88D is one of the most powerful and advanced Weather Surveillance Doppler Radar in the world. Since first being built and tested in 1988, it has been installed and used operationally at over 160 locations across the United States, including Alaska and Hawaii.

Warm colors (red) / positive values indicate wind moving away from the radar (along a radial). Cool colors (green) / negative values indicate wind moving toward the radar. Purple indicates “range folding”— where the radar cannot determine the radial velocity. Velocity image of a large-scale weather system.

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There are no watches, warnings, or advisories at this time.

Weak tornadoes occur in all areas of New England, but EF3 or greater tornadoes have been reported only in New England's practical "Tornado Alley" of Massachusetts, Connecticut, and southern New Hampshire.

On a weather radar map, a tornado is usually indicated by a smaller area of red surrounded by a larger area of green. However, modern radar systems can also indicate debris balls, a sign of a tornado on the ground.

dBZ. Nondimensional "unit" of radar reflectivity which represents a logarithmic power ratio (in decibels, or dB) with respect to radar reflectivity factor, Z. The value of Z is a function of the amount of radar beam energy that is backscattered by a target and detected as a signal (or echo).

Lidar uses laser pulses to measure distances and create 3D maps, while radar uses radio waves to detect and track objects. Lidar offers higher spatial resolution and accuracy, while radar provides a longer range and better performance in adverse weather conditions.

Black dots represent divergence centers. Arrow length is proportional to wind speed. Negative (positive) Doppler velocities represent flow toward (away from) the radar. (

What does purple mean on a radar map? ›

Purple denotes range-folding (RF), which is when the return from a prior pulse is detected during the listening period for the current pulse, and the radar is unable to determine the wind's velocity. Other radar systems commonly use this color scheme, but some may use different colors.

Purples and blues indicate the strongest winds, while dark greens are lighter winds. The greyish shades in the middle of the spectrum indicate very light winds or none at all. Then the right side indicates echoes moving away from the radar.

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MyRadar is a fast, powerful, easy-to-use weather app that displays animated weather radar around your current location and to quickly show what weather is coming your way.

As the most trusted news source, most trusted brand, and most accurate weather forecaster, The Weather Channel and its parent The Weather Company help turn weather into action.

If you're in a long-span building, such as a shopping mall, theater, or gymnasium, is especially dangerous because the roof structure is usually supported solely by the outside walls. Most such buildings hit by tornados cannot withstand the enormous pressure. They simply collapse.

An approaching cloud of debris especially at ground level, even if a funnel is not visible; A loud roar - similar to a freight train - or a strange quiet occurring within or shortly after a thunderstorm. A change in the color of the sky. Debris dropping from the sky.

Traditionally, Tornado Alley is considered as running roughly north from Texas through Oklahoma, Kansas, and Nebraska to South Dakota, and often including neighboring states to the east and west.

Blizzards, coastal storms, and flooding are a fact of life for residents of Boston. We have information to help you before, during, and after a natural disaster. Please note: if you're in the middle of an emergency, dial 9-1-1.