Marine Weather and Tide Forecast for Coloma, CA

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7 Day Forecast for Marine Location Near Coloma, CA

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Area Discussion for - Sacramento, CA

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FXUS66 KSTO 282014 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 114 PM PDT Sun May 28 2023

SYNOPSIS
Isolated to scattered shower and thunderstorm chances continue for the mountains, portions of the foothills, and northern half of the Sacramento Valley through Memorial day. Thunderstorm chances continue through the week over the mountains, portions of the foothills, and northern Sacramento Valley. Temperatures will remain near or slightly below normal. Periods of locally breezy onshore winds.

DISCUSSION
The center of the low has moved off the coast of the Bay Area this afternoon. Thunderstorm activity starting to increase early this afternoon. The focus continues to be over the mountains with chances continuing for portions of the central Sacramento valley northward. Isolated valley thunderstorms look possible through early evening. Any thunderstorms will continue to have heavy rain associated with them and hail. Some of the stronger storms could produce localized flooding. I would not be surprised if an isolated storm produces quarter size hail today given yesterday had a storm produced penny size hail and cape is greater today.
Movement of the storms are to the northwest to north over the crest to west from around Shasta County southward and the coastal range.

On Monday the center of the low will move to the central coast and continue to move southward into Southern California on Tuesday.
Continued afternoon and evening thunderstorms both days. These two days thunderstorms would have the best chance of making it into the Motherlode by late afternoon or early evening.
Thunderstorms are expected to move towards the foothills that form over the higher elevations. Slight chances continue each day for the far northern end of the valley as well. Any Holiday travelers may want to keep the timing in mind.

On Wednesday the low will move near the four corners area while another tough deepens over the Pacific Northwest into northern California. This will keep thunderstorm chances primarily for the mountains. Ensembles are continuing to put thunderstorm chances into the northern Sacramento valley but confidence is low at this time.

Temperatures will generally be below normal for this time of year through Wednesday. Rivers and lakes continue to be very cold. Water temperatures are mainly in the 50s for the valley transitioning to the 40s in the foothills.

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)...

Thursday is when the models diverge a little but are in closer agreement than yesterday. Low pressure area will either be over California or along the northern California coast. Weaker troughing is indicated by the Clusters so there may be less mountain thunderstorm activity. Ensembles continue to keep thunderstorms over the crest extending into the Southern Cascades and northern Sacramento valley at this time.

Friday and Saturday there will be a low pressure area in the Gulf of Alaska but the extent of how deep it is at this time remains uncertain. Weak ridging with warmer temperatures to near normal or slightly above are expected. Ensembles keep some afternoon and evening thunderstorm activity from around the Tahoe region southward along the crest.

Sunday a low pressure though deepens along the coast of California that may result in increased activity over the mountains. Temperatures continue to look to be near normal or slightly above.

AVIATION

VFR conditions are generally forecast to prevail over the next 24 hours. Local MVFR conditions associated with showers and/or thunderstorms, mainly over mountains. MVFR/IFR conditions possible in stratus vicinity of Delta after 06Z Monday. Low stratus may push eastward into the Sacramento area terminals between 10Z-16Z Monday. Gusty and erratic winds expected near thunderstorms. Surface wind generally at or below 15 kts except vicinity of Delta with southwesterly wind up to 25 knots.

STO WATCHES/WARNINGS/ADVISORIES
None.

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Weather Reporting Stations

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Wind History for Port Chicago, CA

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Airport Reports

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Link to 5 minute data for KAUN

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Wind History from AUN (wind in knots)

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Tide / Current Tables for Sacramento %234, Sacramento River, California

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