Weather Alert in Washington
Red Flag Warning issued July 30 at 1:54PM PDT until July 31 at 8:00PM PDT by NWS Spokane WA
AREAS AFFECTED: East Washington Central Cascades
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS WITH ISOLATED DRY THUNDERSTORMS WEDNESDAY AFTERNOON AND EVENING FOR ZONE 696... ...SCATTERED THUNDERSTORMS FOR ZONES 696, 697, 698, 699, 702, 703, 704 THURSDAY AFTERNOON AND EARLY EVENING... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM PDT THURSDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONE 696... The National Weather Service in Spokane has issued a Red Flag Warning for thunderstorms, which is in effect from 11 AM to 8 PM PDT Thursday. * Affected Area: East Washington Central Cascades (Zone 696). * Timing: For Wednesday, until 9 PM PDT. For Thursday, 11 AM to 8 PM PDT. * Relative Humidities: Wednesday, 15 to 25 percent. Thursday, 20 to 40 percent. * Temperatures: Up to 90. * Lightning: Wednesday, isolated thunderstorms. Thursday, scattered thunderstorms. * Outflow Winds: Gusty and erratic winds with gusts 30-50 mph are possible with any thunderstorms that develop. The outflow winds could travel quite a distance from the core of the storm. * Impacts: Hot, dry, and unstable conditions Wednesday afternoon and evening may lead to rapid fire growth on any new or existing fires. Isolated thunderstorms on Wednesday and scattered thunderstorms on Thursday may lead to new fire starts. Gusty winds with thunderstorms may result in rapid fire spread with any new or existing fires.
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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