Marine Weather and Tide Forecast for Isleton, CA

DISCUSSION
Dry weather continues through at least Friday, with cool morning temperatures. A number of locations in the Valley and Delta dropped to around freezing this morning, such as Sacramento Executive Airport at 31 degrees and Stockton at 30. High pressure ridging peaks today, with highs this afternoon rebounding into the mid to upper 60s, highest over the northern Sacramento Valley. Highs will trend cooler as the upper level ridge weakens and a shortwave trough (inside slider) approaches this week and then drops into the region over the weekend. By Saturday highs will be near normal levels, with upper 50s to low 60s for the Valley.

Valley low temperatures are forecast remain in the 30s through the end of the week, with a 15 to 30% chance of below freezing temperatures Friday morning for rural portions of the Valley. Low temperatures in the Valley and Delta will gradually warm to the mid 30s to low 40s heading into the weekend. Patchy morning fog and frost are also expected.

The upper trough(inside slider) will bring gusty north to east winds to the area over the weekend, so this will be the main weather impact for the short term forecast. A Wind Advisory has been issued for the northern mountains and adjacent foothills, as well as western portions of the Sacramento Valley from 10 PM PST Friday to 10 AM PST Sunday. For the mountains and northeast foothills expect northeast to east winds 20 to 30 mph with gusts to 40 to 55 mph. For western portions of the Sacramento Valley, north winds 15 to 25 mph with gusts 35 to 45 mph are forecast.
Winds will be weaker by Sunday afternoon, but will still be gusty.

Inside sliders such as this shortwave trough move across land have limited moisture to work with, so precipitation will be limited. A few light rain showers will be possible over the northern San Joaquin and eastern side of the southern Sacramento Valley on Saturday as the system passes through, but most precipitation will be over the Sierra and foothills. Rain and snow have trended a little higher with the latest National Blend of Models, but are generally expected to be limited. Rainfall amounts in the foothills are forecast to be around a tenth of an inch. Snowfall will be relatively light, though cool temperatures could allow a dusting of snow down to the upper foothills, for elevations around 3000 feet. Higher elevations could see 1 to 2 inches from HWY 50 northward, while the Sierra crest in Tuolumne County could see up to 4 inches of snow.

.EXTENDED DISCUSSION (Monday THROUGH Thursday)...
Ensemble guidance and cluster analysis show the low pressure system progressing further south and east, and ridging building back in over NorCal. This will result in dry weather and cold morning temperatures for early to mid next week. Morning low temperatures will drop back into the 30s, with more widespread chances at near or below freezing Valley temperatures and frost.
Daytime highs will be near to slightly above normal, with Valley temperatures reaching the high 50s to low 60s, and 40s to 50s at higher elevations. On Thursday, there's potential for the approach of a weak trough, though this far out there is much uncertainty around what that could mean for interior NorCal beyond slightly cooler temperatures. The Climate Prediction Center (CPC) 8-14 day outlook has much of interior NorCal under equal chances for above or below normal precipitation. Be sure to stay tuned for forecast updates as we get closer!

AVIATION
Generally VFR conditions prevail across interior NorCal next 24 hours, although some patchy MVFR/IFR in Valley BR/FG are possible from 06z through 17z tomorrow. Winds will be less than 12 kts through early tomorrow.

STO WATCHES/WARNINGS/ADVISORIES
Wind Advisory from 10 PM Friday to 10 AM PST Sunday for Central Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County-Northeast Foothills/Sacramento Valley- Northern Sacramento Valley-Shasta Lake Area / Northern Shasta County-Southern Sacramento Valley-West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.