Weather Alert in Oregon
Red Flag Warning issued July 4 at 12:49AM MDT until July 4 at 11:00PM MDT by NWS Boise ID
AREAS AFFECTED: Burns BLM; Southern Grasslands; Central Canyonlands; Northwestern Vale BLM
DESCRIPTION: ...RED FLAG WARNING FOR SCATTERED LIGHTNING THIS EVENING...AND AGAIN EARLY FRIDAY MORNING THROUGH LATE FRIDAY EVENING IN SOUTHEAST OREGON... .Scattered thunderstorms will increase early this morning in southeast Oregon. Several rounds of thunderstorms are likely through late this evening. Gusty outflow winds and lightning, combined with low humidity this afternoon, will continue to cause critical fire weather conditions. * AFFECTED AREA...In Oregon, Fire Weather Zones 670 Burns BLM, 672 Southern Grasslands, 673 Central Canyonlands and 674 Northwestern Vale BLM. * TIMING...Until 11 PM MDT /10 PM PDT/ this evening. * WINDS... * RELATIVE HUMIDITY... * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Scattered. * OUTFLOW WINDS...Isolated gusts up to 50 mph.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly.
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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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