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AGUS76 KRSA 210310

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

710 PM PST Tue Feb 20 2024



...PRECIP MAINLY SIERRA AND SOCAL TONIGHT...

...SYSTEM FINALLY EXITS TOMORROW...



.METEOROLOGICAL CONDITIONS (TUE PM - MON AM)...



The offshore s/wv trof is ever so slowly making its way toward the 

west coast this evening...finally expected to shift east of the area 

within the next 18 to 24 hours. Currently...ahead of the s/wv trof 

axis...radar imagery shows the best concentration of echoes first in 

a line arching from the northern/central Sierra back across the 

central San Joaquin Valley to the central CA coast. There has been 

several pockets of embedded stronger convection within this area 

through the late afternoon and now early evening hours as lightning 

detection has picked up on numerous strikes. By 21/06Z...look for 

the best precip amounts to fall between the American River basin to 

the north and Merced River basin to the south with totals from 0.25- 

to 0.75-inch. Across coastal southern CA...the initial moisture 

plume is inching closer to clearing the CA/MX border...expected to 

happen overnight. A steady stream of echoes continues to make its 

way inland from Orange and far northwest San Diego counties 

northeast over the Inland Empire...before eventually reaching the 

Las Vegas area. Back behind this main line...there is a less defined 

but just as robust for precip amounts area of precip streaming 

inland across the Santa Monica mountains.



Overnight into Wednesday morning...the best precip will be ahead of 

the s/wv trof axis...focused on the length of the Sierra and once 

again coastal southern CA. Then as the system moves to the east 

during the late morning and afternoon hours...precip will rapidly 

dissipate to just scattered light showers...bringing an end to this 

relatively longer duration event.





QPF graphics are available at www.cnrfc.noaa.gov/qpf.php







Kozlowski



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