Weather Alert in Oregon

Recent Locations: John F Kennedy International Airport, NY Dallas/Fort Worth International Airport, TX Eugene, OR

Current Alerts for Eugene, OR: Air Stagnation Advisory

Air Quality Alert issued February 5 at 9:59AM PST by NWS Pendleton OR

AREAS AFFECTED: Deschutes, OR

DESCRIPTION: Oregon Department of Environmental Quality has issued an Air Quality Advisory until noon PST Saturday. For the Air Quality Advisory, stagnant air conditions will trap smoke and other air pollutants near the ground where people breathe. Check with your local health or air agency for current restrictions on woodstove use. There are often exceptions for those who use wood exclusively to heat their homes and those with limited income. People can take the following precautions to protect their health: * Follow local burn restrictions to prevent deteriorating air quality. * Avoid strenuous outdoor activity in smoky conditions. * People with heart or lung problems and young children are especially vulnerable. These people should stay indoors while smoke levels are high. * Use certified High Efficiency Particulate Air (HEPA) filters in indoor heating ventilation, cooling, and air purification systems. * Avoid using wood-burning stoves and other sources of indoor smoke if possible. For additional information...please visit the Web site at http://www.oregon.gov/DEQ

INSTRUCTION: N/A

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Weather Topic: What are Fractus Clouds?

Home - Education - Cloud Types - Fractus Clouds

Fractus Clouds Next Topic: Freezing Rain

A fractus cloud (scud) is a fragmented, tattered cloud which has likely been sheared off of another cloud. They are accessory clouds, meaning they develop from parent clouds, and are named in a way which describes the original cloud which contained them.

Fractus clouds which have originated from cumulus clouds are referred to as cumulus fractus, while fractus clouds which have originated from stratus clouds are referred to as stratus fractus. Under certain conditions a fractus cloud might merge with another cloud, or develop into a cumulus cloud, but usually a fractus cloud seen by itself will dissipate rapidly.

They are often observed on the leading and trailing edges of storm clouds, and are a display of wind activity.

Next Topic: Freezing Rain

Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

Graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail