Weather

Link to Local Radar Data

Radar

Link to Satellite Data

Satellite

National Digital Forecast Database Maximum Temperature Forecast

Max Temps

National Digital Forecast Database Weather Element Forecast

Graphical Forecast

Area Forecast Discussion

FXUS66 KSTO [Sacramento/WFO CA] 251031 AFDSTO 

FXUS66 KSTO 251031
AFDSTO [HEAD]

National Weather Service Sacramento California 3:31am PDT Mon Sep 25 2017 

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
331 AM PDT MON SEP 25 2017 [HEAD]

Synopsis. Warmer through mid week with dry conditions continuing. Breezy north winds next few days for increased fire danger. Remaining warmer than normal through the end of the week with lighter winds. 

.SYNOPSIS...
WARMER THROUGH MID WEEK WITH DRY CONDITIONS CONTINUING. BREEZY
NORTH WINDS NEXT FEW DAYS FOR INCREASED FIRE DANGER. REMAINING
WARMER THAN NORMAL THROUGH THE END OF THE WEEK WITH LIGHTER WINDS. [DISC]

Discussion. A strong upper level ridge of high pressure will bring continued fair skies and above normal temperatures through the short term period. The overall airmass is forecast to warm a few to several degrees today, Tuesday and a bit more Wednesday as the ridge amplifies and shifts inland. Combination of northerly flow aloft and northerly surface gradient will bring breezy north winds today especially over the northern portion of the CWA [County Warning Area; see the LWP home page (link at bottom of page) for a CWA map]. As surface high pressure pushes into the Great Basin on Tuesday the easterly surface gradient tightens over the Sierra bringing increasing winds there. Winds and low daytime RH [Relative Humidity] as well as poor overnight humidity recovery will bring increased fire danger through Tuesday night. Lighter winds are in store Wednesday as the upper ridge axis centers over the West Coast and surface gradients relax. Little change in forecast expected for Thursday as upper level pattern remains mainly unchanged. 

.DISCUSSION...
A STRONG UPPER LEVEL RIDGE OF HIGH PRESSURE WILL BRING CONTINUED
FAIR SKIES AND ABOVE NORMAL TEMPERATURES THROUGH THE SHORT TERM
PERIOD. THE OVERALL AIRMASS IS FORECAST TO WARM A FEW TO SEVERAL
DEGREES TODAY, TUESDAY AND A BIT MORE WEDNESDAY AS THE RIDGE
AMPLIFIES AND SHIFTS INLAND. COMBINATION OF NORTHERLY FLOW ALOFT
AND NORTHERLY SURFACE GRADIENT WILL BRING BREEZY NORTH WINDS TODAY
ESPECIALLY OVER THE NORTHERN PORTION OF THE CWA. AS SURFACE HIGH
PRESSURE PUSHES INTO THE GREAT BASIN ON TUESDAY THE EASTERLY
SURFACE GRADIENT TIGHTENS OVER THE SIERRA BRINGING INCREASING
WINDS THERE. WINDS AND LOW DAYTIME RH AS WELL AS POOR OVERNIGHT
HUMIDITY RECOVERY WILL BRING INCREASED FIRE DANGER THROUGH TUESDAY
NIGHT. LIGHTER WINDS ARE IN STORE WEDNESDAY AS THE UPPER RIDGE
AXIS CENTERS OVER THE WEST COAST AND SURFACE GRADIENTS RELAX.
LITTLE CHANGE IN FORECAST EXPECTED FOR THURSDAY AS UPPER LEVEL
PATTERN REMAINS MAINLY UNCHANGED. [DISC]

Extended discussion (Friday through Monday) 

.EXTENDED DISCUSSION (FRIDAY THROUGH MONDAY) [DISC]

Eastern Pacific ridging will remain over the area with dry and warm weather continuing through the week. Daytime highs will remain above normal with low 90s across the valley, Delta and into the lower foothills. By Friday, the ridge will slowly be displaced as a trough moves into the Pacific Northwest and this may bring slight cooling. The upper ridge will briefly rebuild and strengthen on Sunday, with valley highs increasing into the mid 90s. Another Pacific trough is expected to bring a slight cool down early next week. (Ek) 

EASTERN PACIFIC RIDGING WILL REMAIN OVER THE AREA WITH DRY AND
WARM WEATHER CONTINUING THROUGH THE WEEK. DAYTIME HIGHS WILL
REMAIN ABOVE NORMAL WITH LOW 90S ACROSS THE VALLEY, DELTA AND
INTO THE LOWER FOOTHILLS. BY FRIDAY, THE RIDGE WILL SLOWLY BE
DISPLACED AS A TROUGH MOVES INTO THE PACIFIC NORTHWEST AND THIS
MAY BRING SLIGHT COOLING. THE UPPER RIDGE WILL BRIEFLY REBUILD
AND STRENGTHEN ON SUNDAY, WITH VALLEY HIGHS INCREASING INTO THE
MID 90S. ANOTHER PACIFIC TROUGH IS EXPECTED TO BRING A SLIGHT COOL
DOWN EARLY NEXT WEEK. EK [DISC]

Aviation.  

.AVIATION... [AVIA]

VFR [Visual Flight Rules] conditions expected for valley TAF [Terminal Aerodrome Forecast] sites for the next 24 hours. Northerly gusts up to 20 kts [23 mph] possible in the Sacramento Valley today 18–02Z [11am–7pm PDT]. (Ek) 

VFR CONDITIONS EXPECTED FOR VALLEY TAF SITES FOR THE NEXT 24
HOURS. NORTHERLY GUSTS UP TO 20KTS POSSIBLE IN THE SACRAMENTO
VALLEY TODAY 18-02Z. EK [AVI2]

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

  • Red Flag Warning until 5am 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 1000–3000 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 1000–3000 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 1000–3000 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. 
.STO WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 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. [WARN]

Point Forecast

Mather CA

25 Sep 8:55am PDT

Today Sunny, with a high near 86°. Light and variable wind becoming NNW 5 to 8 mph in the afternoon.
Tonight Clear, with a low around 56°. NNW wind 5 to 8 mph becoming NE after midnight.
Tuesday Sunny, with a high near 89°. ENE wind around 9 mph becoming NW in the morning.
Tuesday Night Clear, with a low around 59°. West wind 5 to 10 mph becoming north in the evening.
Wednesday Sunny, with a high near 91°. NE wind 5 to 7 mph becoming NNW in the morning.
Wednesday Night Clear, with a low around 59°.
Thursday Sunny, with a high near 90°.
Thursday Night Mostly clear, with a low around 58°.
Friday Sunny, with a high near 90°.
Friday Night Mostly clear, with a low around 57°.
Saturday Sunny, with a high near 88°.
Saturday Night Mostly clear, with a low around 58°.
Sunday Sunny, with a high near 92°.
Today
Sunny, with a high near 86. Light and variable wind becoming north northwest 5 to 8 mph in the afternoon.
Tonight
Clear, with a low around 56. North northwest wind 5 to 8 mph becoming northeast after midnight.
Tuesday
Sunny, with a high near 89. East northeast wind around 9 mph becoming northwest in the morning.
Tuesday Night
Clear, with a low around 59. West wind 5 to 10 mph becoming north in the evening.
Wednesday
Sunny, with a high near 91. Northeast wind 5 to 7 mph becoming north northwest in the morning.
Wednesday Night
Clear, with a low around 59.
Thursday
Sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 58.
Friday
Sunny, with a high near 90.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 92.

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: