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Area Forecast Discussion

FXUS66 KSTO [Sacramento/WFO CA] 271039 AFDSTO 

FXUS66 KSTO 271039
AFDSTO [HEAD]

National Weather Service Sacramento California 3:39am PDT Sun May 27 2018 

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
339 AM PDT SUN MAY 27 2018 [HEAD]

Synopsis. Temperatures warming to well above normal for early this week. Afternoon and evening thunderstorms possible mainly over higher terrain starting on Tuesday. Another cool down is expected for middle to late next week. 

.SYNOPSIS...
TEMPERATURES WARMING TO WELL ABOVE NORMAL FOR EARLY THIS WEEK.
AFTERNOON AND EVENING THUNDERSTORMS POSSIBLE MAINLY OVER HIGHER
TERRAIN STARTING ON TUESDAY. ANOTHER COOL DOWN IS EXPECTED FOR
MIDDLE TO LATE NEXT WEEK. [DISC]

Discussion. Upper level ridging develops today with mainly dry weather. The back end of a departing upper low may have enough instability to generate a few isolated showers and possibly thunderstorms over the Sierra Crest south of Highway 50 in the afternoon/evening. 

.DISCUSSION...
UPPER LEVEL RIDGING DEVELOPS TODAY WITH MAINLY DRY WEATHER. THE
BACK END OF A DEPARTING UPPER LOW MAY HAVE ENOUGH INSTABILITY TO
GENERATE A FEW ISOLATED SHOWERS AND POSSIBLY THUNDERSTORMS OVER
THE SIERRA CREST SOUTH OF HIGHWAY 50 IN THE AFTERNOON/EVENING. [DISC]

Temperatures today are expected to be about 10–15° higher than we saw on Saturday. This means mid 80s to low 90s across the valley, warmers to the north. Memorial Day is expected to be the warmest day with daytime highs in the mid to upper 90s across valley, potentially reaching triple digits in a few spots over the northern Sacramento Valley. This will bring a moderate heat risk for sensitive groups including infants and the elderly. 

TEMPERATURES TODAY ARE EXPECTED TO BE ABOUT 10-15 DEGREES HIGHER
THAN WE SAW ON SATURDAY. THIS MEANS MID 80S TO LOW 90S ACROSS THE
VALLEY, WARMERS TO THE NORTH. MEMORIAL DAY IS EXPECTED TO BE THE
WARMEST DAY WITH DAYTIME HIGHS IN THE MID TO UPPER 90S ACROSS
VALLEY, POTENTIALLY REACHING TRIPLE DIGITS IN A FEW SPOTS OVER THE
NORTHERN SACRAMENTO VALLEY. THIS WILL BRING A MODERATE HEAT RISK
FOR SENSITIVE GROUPS INCLUDING INFANTS AND THE ELDERLY. [DISC]

Models show the ridge flattening on Tuesday ahead of an approaching upper level trough. This will lead to slightly cooler temperatures on Tuesday, although there could still be a moderate heat risk for sensitive groups. There is a slight chance of afternoon and evening thunderstorms over the northern Sierra Crest south of I-80, and over eastern Shasta County and Lassen national park. 

MODELS SHOW THE RIDGE FLATTENING ON TUESDAY AHEAD OF AN APPROACHING
UPPER LEVEL TROUGH. THIS WILL LEAD TO SLIGHTLY COOLER
TEMPERATURES ON TUESDAY, ALTHOUGH THERE COULD STILL BE A MODERATE
HEAT RISK FOR SENSITIVE GROUPS. THERE IS A SLIGHT CHANCE OF
AFTERNOON AND EVENING THUNDERSTORMS OVER THE NORTHERN SIERRA CREST
SOUTH OF I80, AND OVER EASTERN SHASTA COUNTY AND LASSEN NATIONAL
PARK. [DISC]

Wednesday, temperatures drop to more normal levels as the upper trough moves inland, with onshore flow and likely a decent Delta breeze. Afternoon and evening showers and thunderstorms are possible in the mountains. (Ek) 

WEDNESDAY, TEMPERATURES DROP TO MORE NORMAL LEVELS AS THE UPPER
TROUGH MOVES INLAND, WITH ONSHORE FLOW AND LIKELY A DECENT DELTA
BREEZE. AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE
POSSIBLE IN THE MOUNTAINS. EK [DISC]

Extended discussion (Thursday through Sunday) another trough is expected to cool temperatures back to below average late this week along with bringing a chance for a few showers and thunderstorms across the northern portion of the forecast area. Ridging is forecast to return next weekend bringing temperatures back to around average. 

.EXTENDED DISCUSSION (THURSDAY THROUGH SUNDAY)
ANOTHER TROUGH IS EXPECTED TO COOL TEMPERATURES BACK TO BELOW
AVERAGE LATE THIS WEEK ALONG WITH BRINGING A CHANCE FOR A FEW
SHOWERS AND THUNDERSTORMS ACROSS THE NORTHERN PORTION OF THE
FORECAST AREA. RIDGING IS FORECAST TO RETURN NEXT WEEKEND BRINGING
TEMPERATURES BACK TO AROUND AVERAGE. [DISC]

Aviation. VFR [Visual Flight Rules] conditions expected the next 24 hours. Local north wind gusts 15–20 kts [17–23 mph] northern Sacramento Valley 17Z [10am PDT]-01Z [6pm PDT] Monday. 

.AVIATION...
VFR CONDITIONS EXPECTED THE NEXT 24 HOURS. LOCAL NORTH WIND GUSTS
15-20 KTS NORTHERN SACRAMENTO VALLEY 17Z-01Z MONDAY. [AVIA]

STO [Sacramento/WFO CA] Watches/Warnings/Advisories

  • None. 
.STO WATCHES/WARNINGS/ADVISORIES...
NONE. [WARN]

Point Forecast

Auburn CA

27 May 4:35am PDT

Today Sunny, with a high near 82°. ENE wind 5 to 11 mph becoming west in the morning.
Tonight Clear, with a low around 60°. WNW wind 7 to 10 mph becoming ESE in the evening.
Memorial Day Sunny, with a high near 89°. ENE wind 7 to 11 mph becoming west in the morning.
Monday Night Mostly clear, with a low around 63°. NW wind around 7 mph becoming east in the evening.
Tuesday Sunny, with a high near 90°. East wind 5 to 8 mph becoming SW in the morning.
Tuesday Night Mostly clear, with a low around 56°.
Wednesday Sunny, with a high near 78°.
Wednesday Night Partly cloudy, with a low around 48°.
Thursday Mostly sunny, with a high near 69°.
Thursday Night Partly cloudy, with a low around 48°.
Friday Sunny, with a high near 74°.
Friday Night Mostly clear, with a low around 52°.
Saturday Sunny, with a high near 80°.
Today
Sunny, with a high near 82. East northeast wind 5 to 11 mph becoming west in the morning.
Tonight
Clear, with a low around 60. West northwest wind 7 to 10 mph becoming east southeast in the evening.
Memorial Day
Sunny, with a high near 89. East northeast wind 7 to 11 mph becoming west in the morning.
Monday Night
Mostly clear, with a low around 63. Northwest wind around 7 mph becoming east in the evening.
Tuesday
Sunny, with a high near 90. East wind 5 to 8 mph becoming southwest in the morning.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Mostly sunny, with a high near 69.
Thursday Night
Partly cloudy, with a low around 48.
Friday
Sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 80.

This page is generated dynamically from the National Weather Service's NWS point forecast and Area Forecast Discussion, reformatted for readability. NWS glossary; about point forecasts. For more information, visit the Lobitos Weather Project home page. Comments and corrections are welcome: