NATIONAL WEATHER SERVICE FORECAST DISCUSSION
Area Forecast Discussion
Issued by The National Weather Service
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000
FXUS66 KSTO 232201
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
301 PM PDT Sat Sep 23 2017

.SYNOPSIS  
Warmer and drier into next week with breezy north winds.   
.DISCUSSION  A ridge of high pressure will build over the region and remain in place through midweek. Little change in winds expected the next couple of days with northerly winds in the valley being the strongest during the day and easterly winds in the mountains being the strongest at night and in the morning hours. Temperatures will warm a little each of the next several days topping out in the 90s by the middle of next week.
.EXTENDED DISCUSSION  (Wednesday THROUGH Saturday)  An upper ridge of high pressure over the EPAC will nudge towards the Pacific Northwest and build over the area by mid-week. As a result, dry conditions and above temperatures are expected across interior NorCal. Meanwhile, an upper level low will develop over the Great Basin and retrograde over Southern California. This will act to limit warming over the region to some extent. However, daytime highs will likely remain 5-10 degrees above normal in the extended period. By the end of the forecast period, the ridge will slowly be displaced as a trough approaches the Pacific Northwest. A portion of that upper energy could extend into our area and keep temperatures from trending upward as indicated by the ECMWF but the GFS keeps the area warmer.
.AVIATION 
VFR conditions expected for Valley TAF sites for the next 24 hours. Gusts up to 25 kts will continue in the Valley generally through 02z Sunday. Breezy Valley winds will increase Sunday afternoon after 18z.
.STO   WATCHES/WARNINGS/ADVISORIES    
Red Flag Warning from 5 PM Sunday to 5 AM PDT Tuesday for Carquinez Strait and Delta-Central Sacramento Valley in Glenn, Colusa, Yuba, Northern Sutter, and Butte County Below 1000 Ft- Eastern Mendocino NF-Eastern Portion of Shasta/Trinity NF-Lake County Portion of Lake-Napa-Sonoma Unit-Northern Motherlode From 1000 to 3000 Ft. Includes portions of Nevada-Yuba-Placer-Amador and ElDorado Units-Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft-Northern Sierra Foothills from 1000 to 3000 Ft. Includes portions of Shasta-Trinity and Butte Units- Northern Sierra Including Lassen NP and Plumas and Lassen NF/S West of the Sierra Crest (West of Evans Peak-Grizzly Peak- Beckworth Peak)-Northern Sierra Including the Tahoe and ElDorado NF/S West of the Sierra Crest-Southeast Edge Shasta-Trinity NF and Western Portions of Tehama-Glenn Unit-Southern Motherlode From 1000 to 3000 Ft. Includes portions of Calaveras-Tuolumne Unit-Southern Sacramento Valley in Yolo-Sacramento Far Western Placer, southern Sutter and Solano County Below 1000 Ft- Stanislaus NF West of the Sierra Crest.
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