Marine Weather and Tide Forecast for Castro Valley, CA
May 3, 2024 6:55 AM PDT (13:55 UTC) Change Location
 | Sunrise 6:07 AM Sunset 8:02 PM Moonrise 2:44 AM Moonset 2:08 PM |
PZZ531 San Francisco Bay South Of The Bay Bridge- 238 Am Pdt Fri May 3 2024
.small craft advisory in effect from this afternoon through late tonight - .
Today - W winds 5 to 10 knots - .increasing to 15 to 20 knots with gusts up to 25 knots this afternoon.
Tonight - W winds 15 to 20 knots with gusts up to 25 knots.
Sat - SW winds 10 to 15 knots with gusts up to 25 knots. Rain.
Sat night - W winds 15 to 25 knots.
Sun - NW winds 10 to 15 knots.
Sun night - W winds 15 to 20 knots with gusts up to 25 knots.
Mon - W winds 10 to 15 knots with gusts up to 25 knots.
Tue - NW winds 10 to 15 knots.
PZZ500 238 Am Pdt Fri May 3 2024
Synopsis for the central california coast and bays including the Monterey bay - Greater farallones - .and cordell bank national marine sanctuaries - .
strong and gusty northwesterly winds will persist for yet another day as the region remains in between high pressure over the eastern pacific ocean and low pressure over the southwest. Gale force gusts will be possible, especially over the coastal waters and southernmost zones. Tonight, a cold front will drop down from the pacific northwest bringing rain and moderate to fresh breezes across the waters. As the low pressure system exits to the east and the pressure gradient is allowed to relax, winds will diminish going into next week.
strong and gusty northwesterly winds will persist for yet another day as the region remains in between high pressure over the eastern pacific ocean and low pressure over the southwest. Gale force gusts will be possible, especially over the coastal waters and southernmost zones. Tonight, a cold front will drop down from the pacific northwest bringing rain and moderate to fresh breezes across the waters. As the low pressure system exits to the east and the pressure gradient is allowed to relax, winds will diminish going into next week.
Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 031202 AFDMTR
Area Forecast Discussion National Weather Service San Francisco CA 502 AM PDT Fri May 3 2024
New AVIATION, MARINE
SYNOPSIS
Issued at 1243 AM PDT Fri May 3 2024
A cold front will bring rain, gusty winds, and colder temperatures on Saturday. Dry weather returns Sunday as a gradual warming trend kicks off.
SHORT TERM
(Today and tonight)
Issued at 108 AM PDT Fri May 3 2024
A shallow marine layer will bring low stratus to coastal areas and adjacent valleys Friday morning. High temperatures will depend on whether a location is in or out of the marine layer. For example, Pt. Reyes is only expected to reach 56 degrees today, while Santa Rosa will flirt with 80, and enjoy ample sunshine. By the afternoon, an approaching cold front will cause the winds to increase, with rain reaching the North Bay early Saturday morning.
LONG TERM
(Saturday through Thursday)
Issued at 108 AM PDT Fri May 3 2024
A gale force, 997 mb, vertically stacked low pressure system is currently near the Gulf of Alaska. This system will be driven southeast by a 150 kt jet stream through Saturday. This strong jet max will also create divergence aloft, allowing the surface pressure to remain steady or even decrease slightly as the system loses latitude. The low center is expected to come ashore near Northern California or Southern Oregon early Saturday morning. An associated cold front will cross the Bay Area through the day Saturday. This frontal passage will bring periods of rain and gusty winds as it ushers in a new, colder air mass.
Precipitable water values are expected to be above 1" on Saturday, with some guidance as high as 1.25". As the cold, dense air lifts this moisture, rain clouds will develop. The total QPF is holding pretty steady with most places expected to receive around 0.5" on Saturday. While not a total wash-out, this is a significant amount for May, which has monthly normal rainfall pretty close to the expected amount from this one system.
During the afternoon OAK balloon launch Thursday, the 1000-700 mb thickness was measured at 2967 m. This new air mass will drop the that to around 2815 m, according to the NAM point sounding. By Sunday morning, NAM has the 700 mb temperature down to -12.7C, which is well below the 10th percentile (-5.2 C) and even the daily minimum (-9.9 C) from May 5, 1988. Note the 1000-500 mb thickness drop isn't as impressive due to more flat mid-level lapse rates. This suggests that any convection that takes advantage of the cold air aloft will be low-topped, even by Bay Area standards. Additionally, the coldest mid-level air arrives overnight Saturday/early Sunday during the diurnal minimum. These two factors should limit the potential for thunderstorms, although a slight chance remains.
Finally, this system will bring a noticeable drop in temperature, especially for inland areas. Friday will feature inland temps in the mid to upper 70s. 24 hours later, these same places will be stuck in the upper 50s or low 60s.
Beyond Saturday, the forecast is more straight forward. Ridging from subtropical high pressure builds in Sunday which will gradually transition to the standard coastal trough set-up by mid next week. This pattern will bring the return of dry weather, lots of sunshine, and a gradual warming trend. Coastal areas may reach the low 70s and some inland areas will be in the 80s by late week.
AVIATION
(12Z TAFS)
Issued at 457 AM PDT Fri May 3 2024
Currently seeing between LIFR and VFR at the terminals. Widespread VFR to prevail by this afternoon. Winds will be breezy to gusty out of the west through this evening. Mid-to-low end MVFR ceilings make a return tonight ahead of the approaching cold front. This cold front will bring rain and breezy to gusty southwesterly winds to the terminals tonight into tomorrow with LVK, MRY, SJC, and SNS not slated to see rain until beyond the 24-hour TAF period.
Vicinity of SFO...Currently IFR with breezy to gusty westerly flow.
Confidence is highest in the terminal returning to VFR between 15Z and 18Z this morning. Westerly winds will only continue to ramp up as the day goes on. An Airport Weather Warning is in effect from 22Z through 03Z for gusts of up to 40 knots. Winds will remain gusty while becoming southwesterly ahead and through the cold front. Rain chances return to the terminal after 13Z tomorrow morning.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Currently LIFR with breezy southwesterly flow at MRY and IFR with breezy northwesterly flow at SNS. Highest confidence is in both terminals returning to VFR by 18Z. MVFR stratus returns to both terminals this evening with MRY further deteriorating to IFR as the night progresses. Winds will be breezy out of the west through the TAF period. Rain does not reach either terminal until beyond the 24-hour TAF period.
MARINE
(Today through Wednesday)
Issued at 457 AM PDT Fri May 3 2024
Strong and gusty northwesterly winds will persist for yet another day as the region remains in between high pressure over the Eastern Pacific Ocean and low pressure over the Southwest. Gale force gusts will be possible, especially over the coastal waters and southernmost zones. Tonight, a cold front will drop down from the Pacific Northwest bringing rain and moderate to fresh breezes across the waters. As the low pressure system exits to the east and the pressure gradient is allowed to relax, winds will diminish going into next week.
MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 AM PDT this morning for Mry Bay.
Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this evening for Mry Bay.
Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Gale Warning until 3 AM PDT Saturday for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory until 3 PM PDT this afternoon for Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory from 3 AM to 9 AM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM.
Area Forecast Discussion National Weather Service San Francisco CA 502 AM PDT Fri May 3 2024
New AVIATION, MARINE
SYNOPSIS
Issued at 1243 AM PDT Fri May 3 2024
A cold front will bring rain, gusty winds, and colder temperatures on Saturday. Dry weather returns Sunday as a gradual warming trend kicks off.
SHORT TERM
(Today and tonight)
Issued at 108 AM PDT Fri May 3 2024
A shallow marine layer will bring low stratus to coastal areas and adjacent valleys Friday morning. High temperatures will depend on whether a location is in or out of the marine layer. For example, Pt. Reyes is only expected to reach 56 degrees today, while Santa Rosa will flirt with 80, and enjoy ample sunshine. By the afternoon, an approaching cold front will cause the winds to increase, with rain reaching the North Bay early Saturday morning.
LONG TERM
(Saturday through Thursday)
Issued at 108 AM PDT Fri May 3 2024
A gale force, 997 mb, vertically stacked low pressure system is currently near the Gulf of Alaska. This system will be driven southeast by a 150 kt jet stream through Saturday. This strong jet max will also create divergence aloft, allowing the surface pressure to remain steady or even decrease slightly as the system loses latitude. The low center is expected to come ashore near Northern California or Southern Oregon early Saturday morning. An associated cold front will cross the Bay Area through the day Saturday. This frontal passage will bring periods of rain and gusty winds as it ushers in a new, colder air mass.
Precipitable water values are expected to be above 1" on Saturday, with some guidance as high as 1.25". As the cold, dense air lifts this moisture, rain clouds will develop. The total QPF is holding pretty steady with most places expected to receive around 0.5" on Saturday. While not a total wash-out, this is a significant amount for May, which has monthly normal rainfall pretty close to the expected amount from this one system.
During the afternoon OAK balloon launch Thursday, the 1000-700 mb thickness was measured at 2967 m. This new air mass will drop the that to around 2815 m, according to the NAM point sounding. By Sunday morning, NAM has the 700 mb temperature down to -12.7C, which is well below the 10th percentile (-5.2 C) and even the daily minimum (-9.9 C) from May 5, 1988. Note the 1000-500 mb thickness drop isn't as impressive due to more flat mid-level lapse rates. This suggests that any convection that takes advantage of the cold air aloft will be low-topped, even by Bay Area standards. Additionally, the coldest mid-level air arrives overnight Saturday/early Sunday during the diurnal minimum. These two factors should limit the potential for thunderstorms, although a slight chance remains.
Finally, this system will bring a noticeable drop in temperature, especially for inland areas. Friday will feature inland temps in the mid to upper 70s. 24 hours later, these same places will be stuck in the upper 50s or low 60s.
Beyond Saturday, the forecast is more straight forward. Ridging from subtropical high pressure builds in Sunday which will gradually transition to the standard coastal trough set-up by mid next week. This pattern will bring the return of dry weather, lots of sunshine, and a gradual warming trend. Coastal areas may reach the low 70s and some inland areas will be in the 80s by late week.
AVIATION
(12Z TAFS)
Issued at 457 AM PDT Fri May 3 2024
Currently seeing between LIFR and VFR at the terminals. Widespread VFR to prevail by this afternoon. Winds will be breezy to gusty out of the west through this evening. Mid-to-low end MVFR ceilings make a return tonight ahead of the approaching cold front. This cold front will bring rain and breezy to gusty southwesterly winds to the terminals tonight into tomorrow with LVK, MRY, SJC, and SNS not slated to see rain until beyond the 24-hour TAF period.
Vicinity of SFO...Currently IFR with breezy to gusty westerly flow.
Confidence is highest in the terminal returning to VFR between 15Z and 18Z this morning. Westerly winds will only continue to ramp up as the day goes on. An Airport Weather Warning is in effect from 22Z through 03Z for gusts of up to 40 knots. Winds will remain gusty while becoming southwesterly ahead and through the cold front. Rain chances return to the terminal after 13Z tomorrow morning.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Currently LIFR with breezy southwesterly flow at MRY and IFR with breezy northwesterly flow at SNS. Highest confidence is in both terminals returning to VFR by 18Z. MVFR stratus returns to both terminals this evening with MRY further deteriorating to IFR as the night progresses. Winds will be breezy out of the west through the TAF period. Rain does not reach either terminal until beyond the 24-hour TAF period.
MARINE
(Today through Wednesday)
Issued at 457 AM PDT Fri May 3 2024
Strong and gusty northwesterly winds will persist for yet another day as the region remains in between high pressure over the Eastern Pacific Ocean and low pressure over the Southwest. Gale force gusts will be possible, especially over the coastal waters and southernmost zones. Tonight, a cold front will drop down from the Pacific Northwest bringing rain and moderate to fresh breezes across the waters. As the low pressure system exits to the east and the pressure gradient is allowed to relax, winds will diminish going into next week.
MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 AM PDT this morning for Mry Bay.
Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this evening for Mry Bay.
Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Gale Warning until 3 AM PDT Saturday for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory until 3 PM PDT this afternoon for Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory from 3 AM to 9 AM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM.
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Airport Reports
EDIT (hide/show) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| KHWD HAYWARD EXECUTIVE,CA | 4 sm | 61 min | SSE 05 | 10 sm | Overcast | 55°F | 48°F | 77% | 29.93 | |
| KOAK METROPOLITAN OAKLAND INTL,CA | 8 sm | 35 min | E 04 | 10 sm | Mostly Cloudy | 54°F | 52°F | 94% | 29.94 | |
| KLVK LIVERMORE MUNI,CA | 13 sm | 62 min | WSW 05 | 9 sm | Overcast | 52°F | 48°F | 87% | 29.92 | |
| KSQL SAN CARLOS,CA | 17 sm | 20 min | calm | 8 sm | Clear | 52°F | 46°F | 82% | 29.94 | |
| KSFO SAN FRANCISCO INTL,CA | 18 sm | 18 min | WNW 06 | 10 sm | A Few Clouds | 52°F | 46°F | 82% | 29.93 | |
| KCCR BUCHANAN FIELD,CA | 19 sm | 62 min | S 07 | 10 sm | Clear | 54°F | 48°F | 82% | 29.92 | |
| KNUQ MOFFETT FEDERAL AFLD,CA | 20 sm | 20 min | calm | 9 sm | Overcast | 54°F | 50°F | 88% | 29.94 |
Tide / Current for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
EDIT Weekend mode (on/off) (hide/show) Help
Roberts Landing
Click for Map
Fri -- 03:41 AM PDT 2.18 feet Low Tide
Fri -- 03:45 AM PDT Moonrise
Fri -- 06:10 AM PDT Sunrise
Fri -- 08:50 AM PDT 6.16 feet High Tide
Fri -- 03:08 PM PDT Moonset
Fri -- 03:43 PM PDT 0.10 feet Low Tide
Fri -- 08:01 PM PDT Sunset
Fri -- 10:12 PM PDT 6.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 03:41 AM PDT 2.18 feet Low Tide
Fri -- 03:45 AM PDT Moonrise
Fri -- 06:10 AM PDT Sunrise
Fri -- 08:50 AM PDT 6.16 feet High Tide
Fri -- 03:08 PM PDT Moonset
Fri -- 03:43 PM PDT 0.10 feet Low Tide
Fri -- 08:01 PM PDT Sunset
Fri -- 10:12 PM PDT 6.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Roberts Landing, 1.3 miles west of, San Francisco Bay, California, Tide feet
| 12 am |
| 4.9 |
| 1 am |
| 3.8 |
| 2 am |
| 2.9 |
| 3 am |
| 2.3 |
| 4 am |
| 2.2 |
| 5 am |
| 2.8 |
| 6 am |
| 3.8 |
| 7 am |
| 5 |
| 8 am |
| 5.9 |
| 9 am |
| 6.1 |
| 10 am |
| 5.8 |
| 11 am |
| 4.9 |
| 12 pm |
| 3.6 |
| 1 pm |
| 2.2 |
| 2 pm |
| 1 |
| 3 pm |
| 0.3 |
| 4 pm |
| 0.1 |
| 5 pm |
| 0.7 |
| 6 pm |
| 1.9 |
| 7 pm |
| 3.4 |
| 8 pm |
| 5 |
| 9 pm |
| 6.2 |
| 10 pm |
| 6.7 |
| 11 pm |
| 6.5 |
Tide / Current for Oakland Airport SW, South San Francisco Bay, California Current
EDIT (hide/show) HelpOakland Airport SW
Click for Map
Fri -- 03:09 AM PDT 0.01 knots Slack
Fri -- 03:45 AM PDT Moonrise
Fri -- 06:07 AM PDT 0.47 knots Max Flood
Fri -- 06:10 AM PDT Sunrise
Fri -- 08:56 AM PDT -0.00 knots Slack
Fri -- 11:51 AM PDT -0.75 knots Max Ebb
Fri -- 03:08 PM PDT Moonset
Fri -- 03:23 PM PDT 0.00 knots Slack
Fri -- 06:45 PM PDT 0.72 knots Max Flood
Fri -- 08:01 PM PDT Sunset
Fri -- 09:57 PM PDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 03:09 AM PDT 0.01 knots Slack
Fri -- 03:45 AM PDT Moonrise
Fri -- 06:07 AM PDT 0.47 knots Max Flood
Fri -- 06:10 AM PDT Sunrise
Fri -- 08:56 AM PDT -0.00 knots Slack
Fri -- 11:51 AM PDT -0.75 knots Max Ebb
Fri -- 03:08 PM PDT Moonset
Fri -- 03:23 PM PDT 0.00 knots Slack
Fri -- 06:45 PM PDT 0.72 knots Max Flood
Fri -- 08:01 PM PDT Sunset
Fri -- 09:57 PM PDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Oakland Airport SW, South San Francisco Bay, California Current, knots
| 12 am |
| -0.5 |
| 1 am |
| -0.4 |
| 2 am |
| -0.3 |
| 3 am |
| -0 |
| 4 am |
| 0.2 |
| 5 am |
| 0.4 |
| 6 am |
| 0.5 |
| 7 am |
| 0.4 |
| 8 am |
| 0.3 |
| 9 am |
| -0 |
| 10 am |
| -0.4 |
| 11 am |
| -0.7 |
| 12 pm |
| -0.8 |
| 1 pm |
| -0.6 |
| 2 pm |
| -0.4 |
| 3 pm |
| -0.1 |
| 4 pm |
| 0.2 |
| 5 pm |
| 0.5 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.7 |
| 8 pm |
| 0.6 |
| 9 pm |
| 0.4 |
| 10 pm |
| -0 |
| 11 pm |
| -0.4 |
San Francisco Bay Area, CA,
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