Sunrise 6:15 AM   Sunset 7:48 PM Moonrise 6:54 PM   Moonset 5:02 AM

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PZZ531 San Francisco Bay South Of The Bay Bridge- 908 Pm Pdt Mon Apr 22 2024
Tonight - SW winds 15 to 20 knots with gusts up to 25 knots, becoming S 5 to 10 knots after midnight. Tue - S winds 15 to 20 knots. Tue night - SW winds 15 to 20 knots with gusts up to 25 knots. Wed - SW winds 10 to 15 knots. Wed night - W winds 15 to 20 knots with gusts up to 25 knots. Thu - W winds 10 to 20 knots with gusts up to 25 knots. Thu night - W winds 10 to 15 knots. Fri - W winds 10 to 20 knots with gusts up to 25 knots. Sat - W winds 10 to 15 knots.

PZZ500 908 Pm Pdt Mon Apr 22 2024
Synopsis for the central california coast and bays including the Monterey bay - Greater farallones - .and cordell bank national marine sanctuaries - .
southerly winds continuing over the coastal waters into Tuesday, gusty near point sur Tuesday afternoon. Starting Wednesday, winds turn once more to become moderate and northerly. Light southerly swell continues to move through the waters for much of the week.

FXUS66 KSTO 222102 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 202 PM PDT Mon Apr 22 2024


Synopsis
Warm and dry weather continues today. Onshore flow bringing cooler temperatures for Tuesday, along with a chance for a few late day showers and thunderstorms over the mountains.
Precipitation chances increase Thursday afternoon through Friday afternoon as a weather system moves through, best chances in the foothills and mountains.

Discussion
Besides some high clouds, mostly clear skies have remained across the region along with warm temperatures. As of 1:30pm, Downtown Sacramento has gotten to 84 degrees.

As the upper ridge responsible for our warm and dry weather the last several days begins to shift east, those offshore winds will transition to onshore, allowing the cooler Delta breeze to spread further east later this evening. Southwesterly flow will bring breezes of 15-20 mph Tuesday and Wednesday to mainly the Delta and mountains.

Some hires models are indicating a weak vorticity lobe may trigger some brief light showers/sprinkles tomorrow morning as a surge of moisture moves northward tonight-tomorrow morning (as shown by PWATs). Even so, there isn't much in the way of forcing, and forecast soundings still indicate fairly dry low levels, so not anticipating much reaching the surface, at least for the Valley and communities in the lower foothills. Cooler and more moist upper foothill locations may briefly see a few sprinkles as this weak feature moves through the area.

The southwesterly flow is prompted by a more pronounced incoming closed upper low which will primarily impact SoCal, but enough moisture/instability is forecast to be drawn northward for a chance of late day showers and thunderstorms over the northern mountains and northern Sierra during the middle of the week. Best chances being Tuesday afternoon across the Coastal Range, Shasta County and southern Cascades/Lassen Park area. Less of a signal Wednesday, but non-zero chances for isolated showers and thunderstorms as well with lingering moisture around. Better chances for precipitation and stronger winds will be Thursday afternoon-Friday as a shortwave digging into the PacNW will influence NorCal. As pressure gradients tighten, southwesterly winds will increase, with more widespread gusts of 15-25 mph Thursday ahead of a weak cold front. Snow levels with this system will be pretty high, generally remaining above 7 Kft, so the bulk of the (minimal) precip will fall as rain. Storm total forecast increased a tad for Thursday-Friday now showing 0.25-0.50" in the mountains and foothills. Those amounts will likely only produce little, if any, impacts though.

//Peters

.EXTENDED DISCUSSION (Friday THROUGH Monday)...

Ensembles and cluster analysis depict a system dropping down from the PacNW and into the Great Basin late Thursday into Friday.
This will bring cooler temperatures and the potential for widespread light showers, mainly over the foothills and mountains.
There is a 20 to 55% probability of at least a quarter of an inch of precipitation over the foothills and mountains. Latest precipitation amounts from WPC generally range from 0.10 to 0.50 inches, locally higher. A few inches of snow might be possible near Lassen Park and south of I-80, but very little to no impacts are expected due to high snow levels. NBM still indicates a 5 to 35% probability of at least an inch of snow south of HWY 50 late Thursday into Friday. There is also a 15 to 25% probability of isolated thunderstorms Friday afternoon and evening, mainly over the Sierra and associated foothills. Potential impacts include brief downpours, gusty winds, lightning, and small hail.

A brief, weak flat ridge will move over the area on Saturday and Sunday, nudging temperatures back up to seasonable levels through early next week. Early next week, a low pressure system centered over the Pacific Northwest will keep high temperatures near seasonal averages, with Valley temperatures in the mid 70s.

AVIATION

VFR conditions next 24 hrs. An isolated thunderstorm may develop this afternoon 22Z-02Z over the Sierra south of Lake Tahoe and over the Coast Range. After 00Z, southwest surface wind gusts 15-25 kts develop in the west Delta, and local southerly gusts 10-15 kts in the Sacramento Valley (northwesterly in the northern San Joaquin Valley). South to southwest winds across the region tomorrow with bringing some afternoon breezes of 15-20 knots.

STO WATCHES/WARNINGS/ADVISORIES
None.

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Stockton, San Joaquin River, California, Tide feet

Brandt Bridge
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Tue -- 03:00 AM PDT     0.00 knots Slack
Tue -- 05:37 AM PDT     0.65 knots Max Flood
Tue -- 06:03 AM PDT     Moonset
Tue -- 06:18 AM PDT     Sunrise
Tue -- 08:22 AM PDT     -0.00 knots Slack
Tue -- 12:31 PM PDT     -1.02 knots Max Ebb
Tue -- 04:29 PM PDT     0.00 knots Slack
Tue -- 04:51 PM PDT     Full Moon
Tue -- 07:03 PM PDT     0.49 knots Max Flood
Tue -- 07:49 PM PDT     Sunset
Tue -- 07:55 PM PDT     Moonrise
Tue -- 09:30 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Brandt Bridge, San Joaquin River, California Current, knots

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