Weather Alert in Washington
Hydrologic Outlook issued August 14 at 12:20PM PDT by NWS Seattle WA
AREAS AFFECTED: Clallam, WA; Grays Harbor, WA; Island, WA; Jefferson, WA; King, WA; Kitsap, WA; Lewis, WA; Mason, WA; Pierce, WA; San Juan, WA; Skagit, WA; Snohomish, WA; Thurston, WA; Whatcom, WA
DESCRIPTION: ESFSEW A frontal system will move across the area Friday into Saturday across western Washington. Through Saturday afternoon, 3-5 inches of rain are expected across the mountains, with 0.5-1.5 inches expected through the lowlands. Very dry antecedent conditions has left the area soils dry and hard. This amount of rainfall in one storm will not have much time to soak into the very dry soil, which will result in heavy surface runoff. Impacts are uncertain due to how much moisture will be able to be absorbed by the soil. Several different threats are expected with this storm, which are detailed below. *Urban and urban-like flooding will be possible in flat areas and roadways. *Some small streams and creeks may become swollen due to rapid runoff while others may remain lower if the channel bed is able to absorb the water efficiently. *Rivers will not flood, but will undergo rapid rises to unusually high levels for this time of year, some of which may reach daily record crests. This will pose a threat to those engaged in recreational activities in and along river channels. *Burn scars will have the potential to undergo impacts, but the probability is low. Impacts may include flash flooding, debris flows, rock falls, and other falling debris. *Those engaging in recreational activities in the mountains may face challenges to where high water may make forest roads and trails difficult to traverse. Please monitor the latest forecasts from the National Weather Service for additional information.
INSTRUCTION: N/A
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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
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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