…There is a Slight Risk of excessive rainfall over parts of Southern
California on Sunday…
…Lake-effect snow followed by light to moderate lake-enhanced snow over
the Great Lakes…
…There is an Elevated Risk of fire weather over parts of the Southwest
on Sunday and Monday…
An upper-level low over California will slowly move into the Southwest by
Tuesday evening. The system will produce rain and higher-elevation snow
over parts of Central/Southern California through Monday afternoon. The
storm will produce heavy rain on Sunday over portions of Southern
California. Therefore, the WPC has issued a Slight Risk (level 2/4) of
excessive rainfall with these thunderstorms. The associated heavy rain
will create mainly localized areas of flash flooding, with urban areas,
roads, small streams, narrow canyons/gullies, and burn scars the most
vulnerable.
Moreover, the deepening of the upper-level low will increase low-level
wind, with dry fuels and low relative humidity, which has led the SPC to
issue an Elevated Risk of fire weather over parts of Southwest on Sunday
and Monday.
Meanwhile, upper-level energy moving over the Great Lakes will create
lake-effect snow downwind from the Great Lakes through Monday afternoon.
The lake-effect snow will be moderate to heavy downwind from Lake Ontario.
On Monday, another front moves southward out of Central Canada into the
Upper Great Lakes. The system will develop light to moderate snow over the
Great Lakes from Monday afternoon into Tuesday evening.
Furthermore, a wave of low pressure over the Southern Plains/Lower
Mississippi Valley will move northeastward to Virginia by Monday evening
and then southeastward off the Southeast Coast. The boundary will trigger
showers and thunderstorms over parts of the Southern Plains, moving into
the Lower Mississippi Valley by Sunday evening. Overnight Sunday, the
showers and thunderstorms will expand eastward into the Southeast. By
Monday evening, the showers and thunderstorms will begin to taper off
along the front.
Elsewhere, as the California upper-level low moves into the Southwest,
flow off the Western Gulf Coast will stream moisture over the Southern
Plains, producing light rain on Tuesday afternoon.
Ziegenfelder
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
Leave a Reply