Weather Alert in California
Hydrologic Outlook issued February 21 at 2:29PM PST by NWS Medford OR
AREAS AFFECTED: Siskiyou, CA; Coos, OR; Curry, OR; Josephine, OR
DESCRIPTION: ESFMFR A moderate atmospheric river will likely bring periods of moderate to heavy rainfall later this weekend into early next week. The first frontal system is forecast to arrive late Saturday night into Sunday with multiple waves of precipitation continuing Sunday night through Monday, then a Pineapple Express Monday night into Tuesday. Preliminary estimates are showing widespread amounts of 4 to 6 inches along the coast with locally 8 inches in the favored coast ranges of Curry County. Amounts of 3 to 5 inches are possible in the Mount Shasta region and also other favored areas of western Siskiyou County. 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. The warm rain expected MOnday night into Tuesday, with snow levels well above 7000 feet, will cause concern for heavy rain to combine with snowmelt, which would lead to even higher rises. 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 Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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