Weather Alert in Oregon
Red Flag Warning issued September 5 at 7:06AM PDT until September 5 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: John Day Valley; Central Blue Mountains; Southern Blue Mountains; Western Forested Blue Mountains; Central Mountains of Oregon; Northern Deschutes National Forest; Southern Deschutes National Forest
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS ALONG THE WASHINGTON CASCADES TODAY... ...ISOLATED TO SCATTERED THUNDERSTORMS IN CENTRAL AND EASTERN OREGON FRIDAY... .Hot, dry, and unstable conditions will lead to the potential for rapid fire growth on new and existing fires along the Washington Cascades this afternoon and evening. Farther south, isolated to scattered thunderstorms capable of producing abundant cloud-to- ground lightning are forecast Friday for much of central and eastern Oregon. * AFFECTED AREA...Fire Weather Zones 696 John Day Valley, 697 Central Blue Mountains, 698 Southern Blue Mountains, 699 Western Forested Blue Mountains, 700 Central Mountains of Oregon, 704 Northern Deschutes National Forest and 705 Southern Deschutes National Forest. * TIMING...From 1 PM this afternoon to 11 PM PDT this evening. * WINDS...North 5 mph or less. * RELATIVE HUMIDITY...As low as 21 percent. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Isolated to scattered thunderstorms capable of producing abundant cloud-to-ground lightning and gusty outflow winds. * OUTFLOW WINDS...Gusts up to 50 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 is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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