If this event is, indeed, comparable to the 1991 March Miracle, we are in for an interesting weekend.
ATMOSPHERIC CONDITION:
A cold upper-level trough passed our area at 14:30 (2:30 pm) this
afternoon giving gusty southerly winds and periods of moderate rain.
Rain showers and a chance of thunderstorms will develop later this
the evening and will continue through tonight.
The evolving weather pattern is very similar to that of the 1991
“March Miracle”. A low pressure system moving southward out of
the Gulf of Alaska is expected to stall west of Diablo Canyon where
it will entrain moisture from the tropics and intensify to 996 mb
(29.41 in/Hg).
This weather system will maintain a continuous southerly flow over
the region at mid and upper levels of the atmosphere and tap into
subtropical moisture on Friday, bringing the potential for very
heavy rain beginning Friday afternoon through Sunday morning,
especially along our coastal areas.
Snow levels will rise significantly on Friday through Saturday to
7000 feet, but will drop but down to 2,000 feet on Sunday. Heavy
snow totals are expected in the Sierra.
This entire event will produce fresh gale to strong gale (39-54 mph)
southerly winds and heavy rain. At this time, another 3 to 5 inches
of rainfall is expected with this system (Friday through Sunday).
Note: The heaviest rainfall should occur on Saturday afternoon
through early Sunday morning.
A break in the weather is forecast on Monday through Tuesday, then
another cold front will give rain on Wednesday.