####018002787#### AGUS76 KRSA 111506 HMDRSA Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 830 AM PDT Sat May 11 2024 ...WARM TEMPERATURES INTO MID WEEK NEXT WEEK THEN POSSIBLE COOLING NEXT WEEKEND... ...ISOLATED SHOWERS/T-STORMS MAINLY OVER CENTRAL AND SRN SIERRA AND EAST OVER NV IN THE AFTERNOON AND EVENINGS THROUGH WEDNESDAY... .METEOROLOGICAL CONDITIONS (SAT AM - FRI AM)... Upper level ridge over NE Pacific and into the PAC NW builds into the region today as an upper low centered near the four corners region that shifts east. Isolated showers possible mainly over Ern NV today as the low moves off to the east. A weak upper low/trough out in the Eastern Pacific around 130W off CA coast today approaches the CA coast Sunday into Monday and onshore into Srn CA/ Baja on Tuesday and east of the region on Wednesday was the ridge over the Eastern Pacific moves into the region. Isolated showers/thunderstorms possible over Central and Srn Sierra and near the ORCA border on Sunday afternoon/evening and a little better chance over Central and Srn Sierra and possibly into NV on Monday afternoon/evening and chances lessen Tuesday and Wednesday afternoons and evenings. Ridge weakens Friday into the weekend with a shortwave trough moving into the Pac NW and a low possible along the CA coast Friday into the weekend. Although the details are still uncertain with various strength and tracks of the trough/lows. QPF amounts will be variable due to convective nature, but generally a tenth of an inch or less with locally higher amounts (up to around 0.5 inches) possible in heavier showers and thunderstorms. Drizzle/ light rain possible along the coast Sunday and Monday nights/mornings. Freezing levels generally 10000-13000 ft. Max temperatures around 5 to 15 degrees above normal for Srn OR and Nrn and Central CA and around normal over Srn CA and SE CA and over most of NV this afternoon. Max temps generally above normal up to 15 degrees over most of the region Sunday and Monday afternoons except near normal along the CA coast (with deepening marine layer). Temps cool along the Central and Srn CA coast up to 10 degrees below normal on Tuesday. Max temps rise to 5 to 20 degrees above normal on Wednesday except near to around 10 degrees below normal over the Central and Srn CA coast and remain similar on Thursday. Possible cooling for next weekend as ridge weakens and possible low/trough moves through. Overnight temps generally near normal to around 15 degrees above normal tonight into Thursday night. QPF graphics are available at www.cnrfc.noaa.gov/qpf.php Osborne $$