Weather Alert in Oregon
Red Flag Warning issued August 3 at 7:42AM PDT until August 3 at 8:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Southern Blue Mountains
DESCRIPTION: ...ISOLATED TO WIDELY SCATTERED DRY THUNDERSTORMS THIS AFTERNOON... .A mix of scattered wet and isolated dry thunderstorms will develop across the eastern mountains this afternoon into the early evening. The driest thunderstorms are expected to develop across the Southern Blue Mountains. Abundant lightning with gusty outflow winds will be possible with any storm, resulting in increased potential for wildfire starts and rapid spread on existing fires. The National Weather Service in Pendleton has issued a Red Flag Warning for abundant lightning, which is in effect from 2 PM this afternoon to 8 PM PDT this evening. * AFFECTED AREA...Fire Weather Zone 698 Southern Blue Mountains. * TIMING...From 2 PM this afternoon to 8 PM PDT this evening. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Abundant lightning and isolated dry thunderstorms. * OUTFLOW WINDS...Gusty, erratic winds 45 to 55 mph.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - 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
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
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