Hydrometeorological Discussion
Issued by NWS California-Nevada RFC
Issued by NWS California-Nevada RFC
068 AGUS76 KRSA 241522 HMDRSA Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 725 AM PST Sun Nov 24 2024 ...LOW PRESSURE MOVES ACROSS NORTHERN CA LATER TODAY INTO TUESDAY... ...MOISTURE PLUME AFFECTS CENTRAL CA LATE SUNDAY INTO TUESDAY... ...TURNING QUIETER FOR THANKSGIVING... .METEOROLOGICAL CONDITIONS (SUN AM - SAT AM)... A few showers across the area this morning under west-southwest onshore flow...as an upr low spins off the coast of the Pacific Northwest and high pressure resides to the southwest of the tip of Baja California. Look for precip activity to begin to increase across the northern CA coast this afternoon and evening before spreading inland as the upr low begins to slowly make its way to the southeast before crossing the coast near the CA/OR border as an open wave early Tuesday. Limiting factor in terms of precip production will be the lack of any significant moisture as PW values look to remain near 0.50-inch along the north coast. At the same time...a moisture plume from a source northeast of Hawaii along 30N will advect toward the central CA coast and arrive early Monday morning with reasonable inland transport toward the southern Sierra. PW peaks near 1.50-inches near the axis of this feature with nearly 1.25-inches reaching the central CA coast and 1.00-inch inland to the southern Sierra. This will bring an increase in precip across much of central CA from the Santa Cruz Mountains south over the Santa Lucia Mountains to near Point Conception and then inland for the central/southern San Joaquin Valley and adjacent Sierra (mainly Tuolumne River basin down to the Kern River basin. This moisture plume will persist into Tuesday before weakening and sinking south. In general...still looking for 1.00- to 3.00-inches along coastal areas (greatest Big Sur coast)...and 1.00- to almost 2.00-inches for the central/southern San Joaquin Valley...and for the southern Sierra approx 3.00- to 6.00-inches with some localize amounts reaching 7.00-inches. Freezing levels for the duration of the event will hover from 7000-feet to 10500-feet. Conditions turn quieter for Wednesday into Thanksgiving with maybe a few showers late Thanksgiving into Friday as the models are struggling with a disturbance tracking east along 30N and possibly reaching the southern CA coast late Friday. For now...included some rather light precip over the higher terrain of central CA and then coastal southern CA. QPF graphics are available at www.cnrfc.noaa.gov/qpf.php Kozlowski $$