Subj : HVYRAIN: Excessive Rainfall Discussion
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Tue Dec 27 2022 07:50:40

FOUS30 KWBC 270750
QPFERD

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
249 AM EST Tue Dec 27 2022

Day 1
Valid 12Z Tue Dec 27 2022 - 12Z Wed Dec 28 2022

....THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL FOR COASTAL
PORTIONS OF CALIFORNIA, SOUTHERN OREGON AND FOR THE WESTERN
FOOTHILLS OF THE SIERRA NEVADA OF CENTRAL CALIFORNIA...

Anomalous moisture associated with atmospheric river event spreads
southward along cold front today. Upper level troughing moves into
the West, sending potent surface wave into Pacific Northwest. The
greatest flash flooding concerns remain confined to the western
foothills of the Sierra as well as the coastal portions of
southern Oregon down through the Bay area and to Los Angeles
County where slight risks are in place. Some portions of the
coastal Pacific Northwest and northern California that have
already received several inches of rainfall over the past 24 hours
are especially vulnerable to flash flooding today. The heaviest
rainfall (0.1-0.25in/hr rates and +4/+5 Std PWAT anomalies) is
likely to occur over the Bay area and Sierra foothills this
morning into early afternoon before the moisture plume weakens and
sags south. The main excessive rainfall threat should be over by
this evening.


Kebede


Day 2

The Day 2 outlook will be updated by 0830Z.


Day 3

The Day 3 outlook will be updated by 0830Z.


Day 1 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=
v/qpf/94epoints.txt__;!!DZ3fjg!9_i-Q8MVBcBt6qYTSqRqPdfpvBdy0FHe6qVz8DlgPscQ=
it3bkDxA34RYsfz7GcMGspS-fAeJObVWxwF4drE7TyJu8N8$=20
Day 2 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=
v/qpf/98epoints.txt__;!!DZ3fjg!9_i-Q8MVBcBt6qYTSqRqPdfpvBdy0FHe6qVz8DlgPscQ=
it3bkDxA34RYsfz7GcMGspS-fAeJObVWxwF4drE7AFmpfzg$=20
Day 3 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=
v/qpf/99epoints.txt__;!!DZ3fjg!9_i-Q8MVBcBt6qYTSqRqPdfpvBdy0FHe6qVz8DlgPscQ=
it3bkDxA34RYsfz7GcMGspS-fAeJObVWxwF4drE7sC_Fn7w$=20


$$



=3D =3D =3D
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