Archives

Thursday, February 23, 2017

Throwback Thursday: Slushy Scottsdale roads

101 graupel

By Caroline Carpenter / ADOT Communications

Four years ago this week, Scottsdale motorists were driving through a winter wonderland on the Loop 101 Pima Freeway. Our “Throwback Thursday” photo above was taken from one of our traffic cameras near Via de Ventura. On that day in 2013, many thought the slippery stuff was snow, but meteorologists explained that it was a form of precipitation called graupel.

ADOT meteorology intern Ray Greely details the difference between snow and graupel:

Graupel often confuses the general public because it shares attributes with snow. Both form initially by the same process, but graupel undergoes an additional step that gives it a more rounded shape.Snowflake3 Graupel3

Graupel can form when snowflakes come in contact with droplets of supercooled water (pure water that gets to 32 degrees Fahrenheit or cooler without freezing) before reaching the ground. The result is rounder and less unique than a snowflake.

Graupel is softer than sleet or hail and is sometimes called “soft hail.” It's often associated with cool-season thundershowers. When temperatures near the surface are warmer than freezing, graupel can occur.

It's unlikely Scottsdale will see anything resembling snow this week, but just in case you can visit the National Weather Service’s website to learn about on different types of winter precipitation.
Posted by Caroline Carpenter   |  Labels:  meteorologist, Snow, Weather


Back

The Arizona Ombudsman – Citizens Aide helps you resolve ongoing issues with State Agencies.

Civil RightsTitle VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA)

Pursuant to Title VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA), ADOT does not discriminate on the basis of race, color, national origin, age, sex or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at civilrightsoffice@azdot.gov. Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.

De acuerdo con el título VI de la Ley de Derechos Civiles de 1964 y la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés), el Departamento de Transporte de Arizona (ADOT por sus siglas en inglés) no discrimina por raza, color, nacionalidad, edad, género o discapacidad.  Personas que requieren asistencia (dentro de lo razonable) ya sea por el idioma o por discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles en civilrightsoffice@azdot.gov. Las solicitudes deben hacerse lo más pronto posible para asegurar que el equipo encargado del proyecto tenga la oportunidad de hacer los arreglos necesarios.