Weather Alert in Oregon
Red Flag Warning issued August 12 at 10:33PM PDT until August 13 at 9:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Lower Columbia Basin of Oregon; Canyon Grassland of Wallowa County; Eastern Columbia River Gorge of Oregon; East Slopes of Mount Hood National Forest; Kittitas Valley; Lower Columbia Basin; Blue Mountains of Washington; Southeast Washington Grande Ronde Valley; Yakama Alpine District
DESCRIPTION: ...BREEZY WINDS WITH LOW RELATIVE HUMIDITY THROUGH WEDNESDAY... .An approaching weather system will result in breezy winds accompanied by low relative humidity across south-central to southeast Washington and central to northeast Oregon. * AFFECTED AREA...Fire Weather Zones 690 Kittitas Valley, 691 Lower Columbia Basin of Oregon, 691 Lower Columbia Basin of Washington, 692 Blue Mountains of Washington, 693 Canyon Grasslands of Wallowa County, 693 Southeast Washington Grande Ronde Valley, 694 Yakama Alpine District, 701 Eastern Columbia River Gorge of Oregon and 702 East Slopes of the Mt. Hood National Forest. * TIMING...From noon to 9 PM PDT Wednesday. * WINDS...West 15 to 25 mph with gusts of 25 to 40 mph. * RELATIVE HUMIDITY...As low as 12 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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