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 Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
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