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 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
Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
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