Weather Alert in Oregon
Red Flag Warning issued August 13 at 5:07AM PDT until August 13 at 8:00PM PDT by NWS Medford OR
AREAS AFFECTED: Western Rogue Basin including the Illinois Valley; Eastern Rogue Valley
DESCRIPTION: * IMPACTS...Moderate to strong winds combined with critically low relative humidity can lead to rapid growth and spread of new and existing fires. Outdoor burning is banned during fire season. * AFFECTED AREA...Portions of the Rogue Valley in Fire Weather Zone 622, including Medford, White City, Gold Hill, Jacksonville, Talent, Phoenix, and Ashland. In Fire Weather Zone 620, portions of the Rogue and Illinois valleys, including Merlin, Grants Pass, Wilderville, Murphy and Provolt. * WIND...Northwest 10 to 15 mph with gusts of 20 to 25 mph. * HUMIDITY...14 to 18 percent. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr
INSTRUCTION: Follow all fire restrictions. You can find your county's emergency sign up form as well as links to fire restrictions at weather.gov/medford/wildfire. One less spark, one less wildfire. Be sure you're signed up for your county's emergency alert system. Familiarize yourself with your emergency plan and make sure you listen to emergency services. Visit ready.gov/plan for more information. A Red Flag Warning is issued when we identify weather conditions that promote rapid spread of fire which may become life- threatening. This does not mean there is a fire. These conditions are either occurring now or will begin soon. It is important to have multiple ways to receive information from authorities.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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