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FXUS66 KSTO [Sacramento/WFO CA] 301030 AFDSTO ∨

FXUS66 KSTO 301030
AFDSTO [HEAD]

National Weather Service Sacramento California 3:30am PDT Sun Mar 30 2025 ∨

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
330 AM PDT SUN MAR 30 2025 [HEAD]

Discussion. ∨

.DISCUSSION... [DISC]

Synopsis. A strong system will arrive today and continue into Tuesday evening, with widespread rain, heavy mountain snow, gusty southerly winds, and isolated thunderstorms. Another system late Tuesday night into Friday has trended significantly weaker with only light precipitation currently expected. .Key Messages. ∨

.SYNOPSIS...
A STRONG SYSTEM WILL ARRIVE TODAY AND CONTINUE INTO TUESDAY
EVENING, WITH WIDESPREAD RAIN, HEAVY MOUNTAIN SNOW, GUSTY
SOUTHERLY WINDS, AND ISOLATED THUNDERSTORMS. ANOTHER SYSTEM LATE
TUESDAY NIGHT INTO FRIDAY HAS TRENDED SIGNIFICANTLY WEAKER WITH
ONLY LIGHT PRECIPITATION CURRENTLY EXPECTED.
.KEY MESSAGES... [DISC]

* today–Tuesday evening: strongest of this series of storms. Winter Storm Warning for the northern Sierra and southern Cascades above 4000 feet 5pm this evening to 11pm Tuesday. Snow levels rising to 5500–6500 feet this afternoon, lowering to 3000–4000 feet by Monday evening into Tuesday. 48-hour probability of snowfall > 12 inches: 85–100% above 5000 feet along Sierra/southern Cascades. Probability of snowfall > 24 inches: 50–95% above 5000 feet along Sierra/southern Cascades. ∨

* TODAY-TUESDAY EVENING: STRONGEST OF THIS SERIES OF STORMS.
WINTER STORM WARNING FOR THE NORTHERN SIERRA AND SOUTHERN
CASCADES ABOVE 4000 FEET 5 PM THIS EVENING TO 11 PM TUESDAY.
SNOW LEVELS RISING TO 5500-6500 FEET THIS AFTERNOON, LOWERING TO
3000-4000 FEET BY MONDAY EVENING INTO TUESDAY. 48-HOUR
PROBABILITY OF SNOWFALL > 12 INCHES: 85-100% ABOVE 5000 FEET
ALONG SIERRA/SOUTHERN CASCADES. PROBABILITY OF SNOWFALL > 24
INCHES: 50-95% ABOVE 5000 FEET ALONG SIERRA/SOUTHERN CASCADES. [DISC]

* Wind Advisory for the northern and central Sacramento Valley 10am today to 8am Monday. Wind gusts up to 45–50 mph; strongest along and east of I-5. ∨

* WIND ADVISORY FOR THE NORTHERN AND CENTRAL SACRAMENTO VALLEY 10
AM TODAY TO 8 AM MONDAY. WIND GUSTS UP TO 45-50 MPH; STRONGEST
ALONG AND EAST OF I-5. [DISC]

* slight 10–25% chance of thunderstorms in the valley/foothills today through Tuesday in the afternoon/evening. Best chances on Monday. ∨

* SLIGHT 10-25% CHANCE OF THUNDERSTORMS IN THE VALLEY/FOOTHILLS TODAY
THROUGH TUESDAY IN THE AFTERNOON/EVENING. BEST CHANCES ON
MONDAY. [DISC]

* Wednesday–Friday am: a much weaker system enters the region. Low forecast confidence with this system. Snow levels 3000–4000 ft Wednesday morning, rising to 4000–5000 feet Wednesday evening. Probability of snowfall > 4 inches through Friday am: 10–20% above 4500 feet in the Sierra/southern Cascades. ∨

* WEDNESDAY-FRIDAY AM: A MUCH WEAKER SYSTEM ENTERS THE REGION.
LOW FORECAST CONFIDENCE WITH THIS SYSTEM. SNOW LEVELS 3000-4000
FT WEDNESDAY MORNING, RISING TO 4000-5000 FEET WEDNESDAY
EVENING. PROBABILITY OF SNOWFALL > 4 INCHES THROUGH FRIDAY AM:
10-20% ABOVE 4500 FEET IN THE SIERRA/SOUTHERN CASCADES. [DISC]

Changes from previous forecast. ∨

.CHANGES FROM PREVIOUS FORECAST... [DISC]

* earlier start time for Winter Storm Warning, now 5pm this evening. ∨

* EARLIER START TIME FOR WINTER STORM WARNING, NOW 5 PM THIS
EVENING. [DISC]

* rain and snow totals have increased more for today into Tuesday PM. ∨

* RAIN AND SNOW TOTALS HAVE INCREASED MORE FOR TODAY INTO TUESDAY
PM. [DISC]

* gusty winds have trended over a larger area today into Monday am, with a Wind Advisory starting a little earlier, at 10am this morning, now expanded into the central Sacramento Valley. ∨

* GUSTY WINDS HAVE TRENDED OVER A LARGER AREA TODAY INTO MONDAY
AM, WITH A WIND ADVISORY STARTING A LITTLE EARLIER, AT 10 AM
THIS MORNING, NOW EXPANDED INTO THE CENTRAL SACRAMENTO VALLEY. [DISC]

* rain and snow totals have significantly decreased for late Tuesday night-Friday am. Light precipitation expected, mainly over the foothills and mountains. ∨

* RAIN AND SNOW TOTALS HAVE SIGNIFICANTLY DECREASED FOR LATE
TUESDAY NIGHT-FRIDAY AM. LIGHT PRECIPITATION EXPECTED, MAINLY
OVER THE FOOTHILLS AND MOUNTAINS. [DISC]

Aviation. VFR [Visual Flight Rules] conditions across interior Northern California until around 17Z [10am PDT] this morning, then MVFR [Marginal Visual Flight Rules]/IFR [Instrument Flight Rules] conditions as a weather system moves through the area. Periods of valley rain, isolated thunderstorms, and lower ceilings will introduce MVFR [Marginal Visual Flight Rules]/IFR [Instrument Flight Rules] conditions for the next 24 hours. Surface winds below 12 knots [14 mph], until around 17Z [10am PDT] today then southerly wind gusts up to 35 knots [40 mph]; strongest in the northern Sacramento Valley, and mountain wind gusts up to 45 knots [52 mph]. Moderate to heavy mountain snow forecast to begin around 12Z [5am PDT] today and continue beyond 12Z [5am PDT] Monday. ∨

.AVIATION...
VFR CONDITIONS ACROSS INTERIOR NORCAL UNTIL AROUND 17Z THIS
MORNING, THEN MVFR/IFR CONDITIONS AS A WEATHER SYSTEM MOVES
THROUGH THE AREA. PERIODS OF VALLEY RAIN, ISOLATED THUNDERSTORMS,
AND LOWER CEILINGS WILL INTRODUCE MVFR/IFR CONDITIONS FOR THE NEXT
24 HOURS. SURFACE WINDS BELOW 12 KNOTS, UNTIL AROUND 17Z TODAY
THEN SOUTHERLY WIND GUSTS UP TO 35 KNOTS; STRONGEST IN THE
NORTHERN SACRAMENTO VALLEY, AND MOUNTAIN WIND GUSTS UP TO 45
KNOTS. MODERATE TO HEAVY MOUNTAIN SNOW FORECAST TO BEGIN AROUND
12Z TODAY AND CONTINUE BEYOND 12Z MONDAY. [AVIA]

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

Wind Advisory from 10am this morning to 8am PDT Monday for central Sacramento Valley-northern Sacramento Valley. ∨

.STO WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM 10 AM THIS MORNING TO 8 AM PDT MONDAY FOR
CENTRAL SACRAMENTO VALLEY-NORTHERN SACRAMENTO VALLEY. [WARN]

Winter Storm Warning from 5pm this afternoon to 11pm PDT Tuesday for west slope northern Sierra Nevada-western Plumas County/Lassen Park. ∨

WINTER STORM WARNING FROM 5 PM THIS AFTERNOON TO 11 PM PDT
TUESDAY FOR WEST SLOPE NORTHERN SIERRA NEVADA-WESTERN PLUMAS
COUNTY/LASSEN PARK. [WRN2]

Point Forecast

Auburn CA

30 Mar 04:35am PDT

Overnight Showers, mainly after 5am. Low around 44°. Light SE wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Sunday Showers, mainly before 10am. High near 55°. SSE wind 8 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 46°. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Monday Showers, with thunderstorms also possible after 11am. High near 53°. SSW wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Monday Night Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Mostly cloudy, with a low around 40°. SW wind 6 to 13 mph becoming SSE after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.

Tuesday Showers, mainly after 11am. High near 49°. Chance of precipitation is 80%.

Tuesday Night A 40% chance of showers before 11pm. Mostly cloudy, with a low around 38°.

Wednesday Mostly sunny, with a high near 55°.

Wednesday Night A slight chance of showers before 11pm. Partly cloudy, with a low around 38°.

Thursday A slight chance of showers after 11am. Mostly sunny, with a high near 56°.

Thursday Night A chance of showers. Partly cloudy, with a low around 39°.

Friday Sunny, with a high near 61°.

Friday Night Mostly clear, with a low around 42°.

Saturday Sunny, with a high near 67°.

Overnight

Showers, mainly after 5am. Low around 44. Light southeast wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Sunday

Showers, mainly before 10am. High near 55. South southeast wind 8 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night

Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 46. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Monday

Showers, with thunderstorms also possible after 11am. High near 53. South southwest wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Monday Night

Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Mostly cloudy, with a low around 40. Southwest wind 6 to 13 mph becoming south southeast after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.

Tuesday

Showers, mainly after 11am. High near 49. Chance of precipitation is 80%.

Tuesday Night

A 40 percent chance of showers before 11pm. Mostly cloudy, with a low around 38.

Wednesday

Mostly sunny, with a high near 55.

Wednesday Night

A slight chance of showers before 11pm. Partly cloudy, with a low around 38.

Thursday

A slight chance of showers after 11am. Mostly sunny, with a high near 56.

Thursday Night

A chance of showers. Partly cloudy, with a low around 39.

Friday

Sunny, with a high near 61.

Friday Night

Mostly clear, with a low around 42.

Saturday

Sunny, with a high near 67.

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:

Weather NWS glossary About NWS point forecasts Hourly Weather Graph Long-range forecast Radar Satellite Max Temps Graphical Forecast	Area Forecast Discussion FXUS66 KSTO [Sacramento/WFO CA] 301030 AFDSTO ∨ FXUS66 KSTO 301030 AFDSTO [HEAD] National Weather Service Sacramento California 3:30am PDT Sun Mar 30 2025 ∨ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SACRAMENTO CA 330 AM PDT SUN MAR 30 2025 [HEAD] Discussion. ∨ .DISCUSSION... [DISC] Synopsis. A strong system will arrive today and continue into Tuesday evening, with widespread rain, heavy mountain snow, gusty southerly winds, and isolated thunderstorms. Another system late Tuesday night into Friday has trended significantly weaker with only light precipitation currently expected. .Key Messages. ∨ .SYNOPSIS... A STRONG SYSTEM WILL ARRIVE TODAY AND CONTINUE INTO TUESDAY EVENING, WITH WIDESPREAD RAIN, HEAVY MOUNTAIN SNOW, GUSTY SOUTHERLY WINDS, AND ISOLATED THUNDERSTORMS. ANOTHER SYSTEM LATE TUESDAY NIGHT INTO FRIDAY HAS TRENDED SIGNIFICANTLY WEAKER WITH ONLY LIGHT PRECIPITATION CURRENTLY EXPECTED. .KEY MESSAGES... [DISC] * today–Tuesday evening: strongest of this series of storms. Winter Storm Warning for the northern Sierra and southern Cascades above 4000 feet 5pm this evening to 11pm Tuesday. Snow levels rising to 5500–6500 feet this afternoon, lowering to 3000–4000 feet by Monday evening into Tuesday. 48-hour probability of snowfall > 12 inches: 85–100% above 5000 feet along Sierra/southern Cascades. Probability of snowfall > 24 inches: 50–95% above 5000 feet along Sierra/southern Cascades. ∨ * TODAY-TUESDAY EVENING: STRONGEST OF THIS SERIES OF STORMS. WINTER STORM WARNING FOR THE NORTHERN SIERRA AND SOUTHERN CASCADES ABOVE 4000 FEET 5 PM THIS EVENING TO 11 PM TUESDAY. SNOW LEVELS RISING TO 5500-6500 FEET THIS AFTERNOON, LOWERING TO 3000-4000 FEET BY MONDAY EVENING INTO TUESDAY. 48-HOUR PROBABILITY OF SNOWFALL > 12 INCHES: 85-100% ABOVE 5000 FEET ALONG SIERRA/SOUTHERN CASCADES. PROBABILITY OF SNOWFALL > 24 INCHES: 50-95% ABOVE 5000 FEET ALONG SIERRA/SOUTHERN CASCADES. [DISC] * Wind Advisory for the northern and central Sacramento Valley 10am today to 8am Monday. Wind gusts up to 45–50 mph; strongest along and east of I-5. ∨ * WIND ADVISORY FOR THE NORTHERN AND CENTRAL SACRAMENTO VALLEY 10 AM TODAY TO 8 AM MONDAY. WIND GUSTS UP TO 45-50 MPH; STRONGEST ALONG AND EAST OF I-5. [DISC] * slight 10–25% chance of thunderstorms in the valley/foothills today through Tuesday in the afternoon/evening. Best chances on Monday. ∨ * SLIGHT 10-25% CHANCE OF THUNDERSTORMS IN THE VALLEY/FOOTHILLS TODAY THROUGH TUESDAY IN THE AFTERNOON/EVENING. BEST CHANCES ON MONDAY. [DISC] * Wednesday–Friday am: a much weaker system enters the region. Low forecast confidence with this system. Snow levels 3000–4000 ft Wednesday morning, rising to 4000–5000 feet Wednesday evening. Probability of snowfall > 4 inches through Friday am: 10–20% above 4500 feet in the Sierra/southern Cascades. ∨ * WEDNESDAY-FRIDAY AM: A MUCH WEAKER SYSTEM ENTERS THE REGION. LOW FORECAST CONFIDENCE WITH THIS SYSTEM. SNOW LEVELS 3000-4000 FT WEDNESDAY MORNING, RISING TO 4000-5000 FEET WEDNESDAY EVENING. PROBABILITY OF SNOWFALL > 4 INCHES THROUGH FRIDAY AM: 10-20% ABOVE 4500 FEET IN THE SIERRA/SOUTHERN CASCADES. [DISC] Changes from previous forecast. ∨ .CHANGES FROM PREVIOUS FORECAST... [DISC] * earlier start time for Winter Storm Warning, now 5pm this evening. ∨ * EARLIER START TIME FOR WINTER STORM WARNING, NOW 5 PM THIS EVENING. [DISC] * rain and snow totals have increased more for today into Tuesday PM. ∨ * RAIN AND SNOW TOTALS HAVE INCREASED MORE FOR TODAY INTO TUESDAY PM. [DISC] * gusty winds have trended over a larger area today into Monday am, with a Wind Advisory starting a little earlier, at 10am this morning, now expanded into the central Sacramento Valley. ∨ * GUSTY WINDS HAVE TRENDED OVER A LARGER AREA TODAY INTO MONDAY AM, WITH A WIND ADVISORY STARTING A LITTLE EARLIER, AT 10 AM THIS MORNING, NOW EXPANDED INTO THE CENTRAL SACRAMENTO VALLEY. [DISC] * rain and snow totals have significantly decreased for late Tuesday night-Friday am. Light precipitation expected, mainly over the foothills and mountains. ∨ * RAIN AND SNOW TOTALS HAVE SIGNIFICANTLY DECREASED FOR LATE TUESDAY NIGHT-FRIDAY AM. LIGHT PRECIPITATION EXPECTED, MAINLY OVER THE FOOTHILLS AND MOUNTAINS. [DISC] Aviation. VFR [Visual Flight Rules] conditions across interior Northern California until around 17Z [10am PDT] this morning, then MVFR [Marginal Visual Flight Rules]/IFR [Instrument Flight Rules] conditions as a weather system moves through the area. Periods of valley rain, isolated thunderstorms, and lower ceilings will introduce MVFR [Marginal Visual Flight Rules]/IFR [Instrument Flight Rules] conditions for the next 24 hours. Surface winds below 12 knots [14 mph], until around 17Z [10am PDT] today then southerly wind gusts up to 35 knots [40 mph]; strongest in the northern Sacramento Valley, and mountain wind gusts up to 45 knots [52 mph]. Moderate to heavy mountain snow forecast to begin around 12Z [5am PDT] today and continue beyond 12Z [5am PDT] Monday. ∨ .AVIATION... VFR CONDITIONS ACROSS INTERIOR NORCAL UNTIL AROUND 17Z THIS MORNING, THEN MVFR/IFR CONDITIONS AS A WEATHER SYSTEM MOVES THROUGH THE AREA. PERIODS OF VALLEY RAIN, ISOLATED THUNDERSTORMS, AND LOWER CEILINGS WILL INTRODUCE MVFR/IFR CONDITIONS FOR THE NEXT 24 HOURS. SURFACE WINDS BELOW 12 KNOTS, UNTIL AROUND 17Z TODAY THEN SOUTHERLY WIND GUSTS UP TO 35 KNOTS; STRONGEST IN THE NORTHERN SACRAMENTO VALLEY, AND MOUNTAIN WIND GUSTS UP TO 45 KNOTS. MODERATE TO HEAVY MOUNTAIN SNOW FORECAST TO BEGIN AROUND 12Z TODAY AND CONTINUE BEYOND 12Z MONDAY. [AVIA] STO [Sacramento/WFO CA] Watches/Warnings/Advisories Wind Advisory from 10am this morning to 8am PDT Monday for central Sacramento Valley-northern Sacramento Valley. ∨ .STO WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY FROM 10 AM THIS MORNING TO 8 AM PDT MONDAY FOR CENTRAL SACRAMENTO VALLEY-NORTHERN SACRAMENTO VALLEY. [WARN] Winter Storm Warning from 5pm this afternoon to 11pm PDT Tuesday for west slope northern Sierra Nevada-western Plumas County/Lassen Park. ∨ WINTER STORM WARNING FROM 5 PM THIS AFTERNOON TO 11 PM PDT TUESDAY FOR WEST SLOPE NORTHERN SIERRA NEVADA-WESTERN PLUMAS COUNTY/LASSEN PARK. [WRN2]	Point Forecast Auburn CA 30 Mar 04:35am PDT Overnight Showers, mainly after 5am. Low around 44°. Light SE wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible. Sunday Showers, mainly before 10am. High near 55°. SSE wind 8 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible. Sunday Night Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 46°. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible. Monday Showers, with thunderstorms also possible after 11am. High near 53°. SSW wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible. Monday Night Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Mostly cloudy, with a low around 40°. SW wind 6 to 13 mph becoming SSE after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%. Tuesday Showers, mainly after 11am. High near 49°. Chance of precipitation is 80%. Tuesday Night A 40% chance of showers before 11pm. Mostly cloudy, with a low around 38°. Wednesday Mostly sunny, with a high near 55°. Wednesday Night A slight chance of showers before 11pm. Partly cloudy, with a low around 38°. Thursday A slight chance of showers after 11am. Mostly sunny, with a high near 56°. Thursday Night A chance of showers. Partly cloudy, with a low around 39°. Friday Sunny, with a high near 61°. Friday Night Mostly clear, with a low around 42°. Saturday Sunny, with a high near 67°. Overnight Showers, mainly after 5am. Low around 44. Light southeast wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible. Sunday Showers, mainly before 10am. High near 55. South southeast wind 8 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible. Sunday Night Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 46. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible. Monday Showers, with thunderstorms also possible after 11am. High near 53. South southwest wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible. Monday Night Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Mostly cloudy, with a low around 40. Southwest wind 6 to 13 mph becoming south southeast after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%. Tuesday Showers, mainly after 11am. High near 49. Chance of precipitation is 80%. Tuesday Night A 40 percent chance of showers before 11pm. Mostly cloudy, with a low around 38. Wednesday Mostly sunny, with a high near 55. Wednesday Night A slight chance of showers before 11pm. Partly cloudy, with a low around 38. Thursday A slight chance of showers after 11am. Mostly sunny, with a high near 56. Thursday Night A chance of showers. Partly cloudy, with a low around 39. Friday Sunny, with a high near 61. Friday Night Mostly clear, with a low around 42. Saturday Sunny, with a high near 67.
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: