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This has been an interesting rainy season for California. Slightly wet November, dry December, wet January, dry February, super wet March with a pineapple express about to hit.
Flash Flood Watches are in effect in Southern California.
Quote:
Flood Watch
National Weather Service Los Angeles/Oxnard CA
456 PM PDT Tue Mar 20 2018
...FLASH FLOOD WATCH FOR RECENT BURN AREAS ACROSS SOUTHWESTERN
CALIFORNIA...
.A large and powerful storm system across the Eastern Pacific is
expected to approach the West Coast through Friday. A subtropical
fetch of moisture well ahead of the system is expected to bring
periods of moderate to heavy rain to portions of Southwest
California through late Thursday or early Friday. The most
widespread moderate to heavy rain currently looks to be focused
along and ahead of a cold front pushing through the region
Wednesday night into Thursday. Flash flooding and mud and debris
flows are likely in and around recent burn areas in the watch
area. There is the potential that the Flash Flood Watch will need
to be expanded to include areas outside of recent burn areas
during the peak of the storm system Wednesday night into Thursday.
Rain will likely come to an end behind the cold front sometime
late Thursday into early Friday. Storm total rainfall is expected
to range from 2 to 5 inches across coastal and valley areas, with
5 to locally 10 inches across the foothills and coastal slopes.
Can you explain why it seems that in Southern California they go weeks without rain and then all of a sudden there are extreme storms that bring 10" of rain?
This is the second time it's happened this year. It only seems to be confined to Southern California although Northern California can get these atmospheric rivers too.
But going further north you have Seattle which has a more consistent rain in its rainy season instead of the "swells".
My theory is that the Pacific high pressure system is so strong most of the time that it takes a very strong storm system to penetrate it and so only the extremely strong storms can make it into Southern California and when they do, it will cause extremely high rainfall rates. What do you think?
Can you explain why it seems that in Southern California they go weeks without rain and then all of a sudden there are extreme storms that bring 10" of rain?
This is the second time it's happened this year. It only seems to be confined to Southern California although Northern California can get these atmospheric rivers too.
But going further north you have Seattle which has a more consistent rain in its rainy season instead of the "swells".
My theory is that the Pacific high pressure system is so strong most of the time that it takes a very strong storm system to penetrate it and so only the extremely strong storms can make it into Southern California and when they do, it will cause extremely high rainfall rates. What do you think?
We get the same thing in FL. Go 8 months with no rain and get 20 to 30" in a few weeks time. Just more proof the planet is seeing rapid weather changes.
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