Weather Alert in California
Hydrologic Outlook issued February 22 at 1:23PM PST by NWS Medford OR
AREAS AFFECTED: Siskiyou, CA; Coos, OR; Curry, OR; Douglas, OR; Jackson, OR; Josephine, OR
DESCRIPTION: ESFMFR A warm sourced atmospheric river, commonly referred to as a Pineapple Express, will likely bring periods of moderate to heavy rainfall Monday afternoon through Tuesday. Current rainfall forecasts show widespread amounts of 2 to 4 inches along the coast with locally up to 6 inches in the favored coast ranges of Curry County. Up to an inch of rain is expected for many of the inland West Side valleys, with 1 to 3 inches along the Cascades and mountains and south slopes of Siskiyou County, and between a quarter of an inch and an inch across the East Side. Compounding the hydrological concerns, the warm rain is expected with snow levels well above 7000 feet, which will result in snowmelt and therefore higher than expected runoff in area watersheds. Small streams and creeks are likely to rise rapidly during this event with nuisance flooding and ponding of water on roadways during periods of heavy rain. Significant rises on main stem rivers and flashier creeks are also expected. Given that rivers are still running fairly low for this time of year, river flooding potential is a bit lower than usual, but there is at least a low probability of some flooding, especially in the Coquille Basin, and along the more flashier streams such as Deer Creek in Roseburg and Little Butte Creek in Eagle Point. While the exact scenario for the heavy rainfall and potential flooding remains uncertain, we will continue to monitor the forecasts and update accordingly. Flood Watches may be issued by the National Weather Service if this situation worsens.
INSTRUCTION: N/A
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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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