Weather Alert in Oregon
Red Flag Warning issued August 11 at 1:11PM PDT until August 13 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: John Day Valley; Southern Blue Mountains; Central Mountains of Oregon; Warm Springs Reservation; Northern Deschutes National Forest; Southern Deschutes National Forest
DESCRIPTION: ...BREEZY WINDS WITH LOW RH VALUES THROUGH WEDNESDAY... .An approaching system will result in breezy winds Tuesday and Wednesday as hot and dry conditions persist. Main concerns Tuesday are focused across Central Oregon, extending into Central Washington Wednesday. The National Weather Service in Pendleton has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon Tuesday to 11 PM PDT Wednesday. * AFFECTED AREA...Fire Weather Zones 696 John Day Valley, 698 Southern Blue Mountains, 700 Central Mountains of Oregon, 703 Warm Springs Reservation, 704 Northern Deschutes National Forest and 705 Southern Deschutes National Forest. * TIMING...From noon Tuesday to 11 PM PDT Wednesday. * WINDS...West 10 to 15 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.
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 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
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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