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AGUS76 KRSA 131337

HMDRSA



Hydrometeorological Discussion

National Weather Service / California Nevada RFC / Sacramento CA

635 AM PDT Wed Mar 13 2024



...SCATTERED SHOWERS MAINLY SOUTH/EAST WITH UPPER LOW...



.METEOROLOGICAL CONDITIONS (SHORT TERM: WED AM - SAT AM)...



The s/wv trof that moved inland across the Pacific Northwest and 

northern CA yesterday is now over the interior of the western US and 

beginning to drop southward toward the Great Basin...while a strong 

area of high pressure builds just off the west coast and expands 

northward into western Canada. The upper low will pretty much track 

along the UT/NV border today before settling close to the CA/NV/AZ 

triple point. The offshore upr ridge will nudge closer to the coast 

and build over BC and the Pacific Northwest. This will put the 

region under mainly dry north to northeast flow through the end of 

the week. Models are showing much of the moisture and precip 

activity on the downstream side of the upr low across the Desert 

Southwest and 4-Corners region...but there is enough wrap around 

moisture backing into southern NV and portions of southern CA that 

will generate some light precip primarily later Thursday into 

Friday. Freezing levels will show a sharp gradient with the highest 

to the northwest (10000- to 11000-feet) and the lowest to the east 

(4000- to 6000-feet).





.METEOROLOGICAL CONDITIONS (LONG TERM: SAT AM - TUE AM)...



High pressure over the Pacific Northwest and northern California 

with a stationary upper-level low over CA/NV/AZ borders through a 

majority of the long term window. The weakening low over the 

southern portions of the forecast region will provide support for 

isolated shower and thunderstorm activity from the Southern 

Sierra/Owens Valley to the southern California mountains and 

southeastern deserts. Precipitation accumulations through Monday 

morning are generally light (less than a tenth of an inch) though 

locally higher accumulations may occur within thunderstorms. Models 

suggest the low may begin to move out of the forecast region later 

on Monday and into Tuesday, though models disagree on exact timing 

and track of the departure with some holding shower activity through 

the long term window. Freezing levels generally around 10,000 feet 

in northern CA and around 5,000-7,000 feet over southern California 

and Nevada Saturday before rising to 7,000-9,000 feet over southern 

California and Nevada on Sunday and into Monday. 





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







Kozlowski/CH



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