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 is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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