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Area Forecast Discussion

FXUS66 KSTO [Sacramento/WFO CA] 252146 AFDSTO 

FXUS66 KSTO 252146
AFDSTO [HEAD]

National Weather Service Sacramento California 2:46pm PDT Tue Apr 25 2017 

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
246 PM PDT TUE APR 25 2017 [HEAD]

Synopsis. Weak weather systems will bring light precipitation through Wednesday. Gusty north winds develop late in the week. 

.SYNOPSIS...
WEAK WEATHER SYSTEMS WILL BRING LIGHT PRECIPITATION THROUGH
WEDNESDAY. GUSTY NORTH WINDS DEVELOP LATE IN THE WEEK. [DISC]

Discussion. Dry weather persists across most of interior Northern California as a shortwave ridge nudges into the region. A few showers are moving through the far northern portions of the state as warm advection starts to take hold. Under partly cloudy skies, Central Valley locations have warmed into the upper 60s to lower 70s, with 40s to 60s over the mountains. 

.DISCUSSION...
DRY WEATHER PERSISTS ACROSS MOST OF INTERIOR NORTHERN CALIFORNIA
AS A SHORTWAVE RIDGE NUDGES INTO THE REGION. A FEW SHOWERS ARE
MOVING THROUGH THE FAR NORTHERN PORTIONS OF THE STATE AS WARM
ADVECTION STARTS TO TAKE HOLD. UNDER PARTLY CLOUDY SKIES, CENTRAL
VALLEY LOCATIONS HAVE WARMED INTO THE UPPER 60S TO LOWER 70S, WITH
40S TO 60S OVER THE MOUNTAINS. [DISC]

A series of weak weather systems will pass through the region tonight through Wednesday. Only light precipitation totals are expected with these systems and should occur mainly over the mountains. The timeframe of most widespread precipitation should occur during the day Wednesday. 

A SERIES OF WEAK WEATHER SYSTEMS WILL PASS THROUGH THE REGION
TONIGHT THROUGH WEDNESDAY. ONLY LIGHT PRECIPITATION TOTALS ARE
EXPECTED WITH THESE SYSTEMS AND SHOULD OCCUR MAINLY OVER THE
MOUNTAINS. THE TIMEFRAME OF MOST WIDESPREAD PRECIPITATION SHOULD
OCCUR DURING THE DAY WEDNESDAY. [DISC]

After these systems pass by, a longwave trough will deepen over the Great Basin in an "inside slider" pattern. This is traditionally a favorable pattern for breezy north winds across Northern California. At this stage it looks like wind gusts in the range of 30–40 mph will be possible Thursday through Friday in the valley… strongest in the San Joaquin Valley. 

AFTER THESE SYSTEMS PASS BY, A LONGWAVE TROUGH WILL DEEPEN OVER
THE GREAT BASIN IN AN "INSIDE SLIDER" PATTERN. THIS IS
TRADITIONALLY A FAVORABLE PATTERN FOR BREEZY NORTH WINDS ACROSS
NORTHERN CALIFORNIA. AT THIS STAGE IT LOOKS LIKE WIND GUSTS IN
THE RANGE OF 30-40 MPH WILL BE POSSIBLE THURSDAY THROUGH FRIDAY IN
THE VALLEY...STRONGEST IN THE SAN JOAQUIN VALLEY. [DISC]

Dang 

DANG [CRED]

Extended discussion (Saturday through Tuesday) 

.EXTENDED DISCUSSION (SATURDAY THROUGH TUESDAY) [DISC]

High amplitude upper ridging in the Eastern Pacific extends over interior Northern California through the weekend resulting in dry conditions with above normal temperatures. Breezy northerly winds from Friday continue into Saturday. Ridging weakens over northern portions of California Monday as a short wave trough digs through the Pacific Northwest into the Great Basin. This will result in minor cooling over northern portions of the forecast area. High pressure rebuilds behind the wave Monday night into Tuesday resulting in a return of breezy northerly wind. Low level CAA [Cold Air Advection - the advection (movement) of cold air into a region] with this flow will offset downslope warming and maintain slightly cooler temps of northern portions Tuesday. 

HIGH AMPLITUDE UPPER RIDGING IN THE EPAC EXTENDS OVER INTERIOR
NORCAL THROUGH THE WEEKEND RESULTING IN DRY CONDITIONS WITH ABOVE
NORMAL TEMPERATURES. BREEZY NORTHERLY WINDS FROM FRIDAY CONTINUE
INTO SATURDAY. RIDGING WEAKENS OVER NORTHERN PORTIONS OF CA MONDAY
AS A SHORT WAVE TROUGH DIGS THROUGH THE PACNW INTO THE GREAT
BASIN. THIS WILL RESULT IN MINOR COOLING OVER NORTHERN PORTIONS OF
THE FORECAST AREA. HIGH PRESSURE REBUILDS BEHIND THE WAVE MONDAY
NIGHT INTO TUESDAY RESULTING IN A RETURN OF BREEZY NORTHERLY WIND.
LOW LEVEL CAA WITH THIS FLOW WILL OFFSET DOWNSLOPE WARMING AND
MAINTAIN SLIGHTLY COOLER TEMPS OF NORTHERN PORTIONS TUESDAY. [DISC]

Aviation.  

.AVIATION... [AVIA]

North winds to 25 mph over the San Joaquin Valley into the evening… then generally light winds through Wednesday morning. Scattered light showers over the northern Sacramento Valley after 11pm. 

NORTH WINDS TO 25 MPH OVER THE SAN JOAQUIN VALLEY INTO THE
EVENING...THEN GENERALLY LIGHT WINDS THROUGH WEDNESDAY MORNING.
SCATTERED LIGHT SHOWERS OVER THE NORTHERN SACRAMENTO VALLEY AFTER
11 PM. [AVI2]

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

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

Point Forecast

Auburn CA

25 Apr 2:35pm PDT

Tonight Mostly cloudy, with a low around 50°. WSW wind 5 to 7 mph becoming calm.
Wednesday A 50% chance of showers. Mostly cloudy, with a high near 63°. SSE wind 5 to 10 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night A 30% chance of showers before 11pm. Partly cloudy, with a low around 48°. South wind 5 to 8 mph becoming light and variable after midnight.
Thursday Mostly sunny, with a high near 68°. Light and variable wind becoming WNW 5 to 9 mph in the afternoon.
Thursday Night Mostly clear, with a low around 45°. NW wind 5 to 8 mph becoming light and variable in the evening.
Friday Sunny, with a high near 69°.
Friday Night Mostly clear, with a low around 48°.
Saturday Sunny, with a high near 74°.
Saturday Night Clear, with a low around 50°.
Sunday Sunny, with a high near 77°.
Sunday Night Mostly clear, with a low around 50°.
Monday Sunny, with a high near 74°.
Monday Night Mostly clear, with a low around 52°.
Tuesday Sunny, with a high near 72°.
Tonight
Mostly cloudy, with a low around 50. West southwest wind 5 to 7 mph becoming calm.
Wednesday
A 50 percent chance of showers. Mostly cloudy, with a high near 63. South southeast wind 5 to 10 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 30 percent chance of showers before 11pm. Partly cloudy, with a low around 48. South wind 5 to 8 mph becoming light and variable after midnight.
Thursday
Mostly sunny, with a high near 68. Light and variable wind becoming west northwest 5 to 9 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 45. Northwest wind 5 to 8 mph becoming light and variable in the evening.
Friday
Sunny, with a high near 69.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 74.
Saturday Night
Clear, with a low around 50.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 50.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 72.

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: